Using the Borland Database Engine to read AND write SHARED Paradox Database Tables

I need to read and write Paradox database tables with a C# AT THE SAME TIME AS people using the Paradox tables with legacy Paradox programs interactively.
I think the only way to do that reliably without corrupting the tables is to use the BDE Borland Database Engine.
Does anyone know how to do that? I found this c++ program... But I don't know how to integrate this into c#
http://www.codeproject.com/KB/database/bdedatabase.aspx
Is there another way to do this? Again, most important, I don't want to corrupt the paradox database.
I can read the paradox records all day long, that is no problem, it is updating at the same time as the legacy program users..
I also know that the whole thing needs to be updated, but that can not be done overnight.
Thanks in advance
Dave

Being pretty new to programming, I am trying just to read info from Paradox tables with C#. Info is actively being updated from another program at the same time. The program I am trying to write only needs to read data. The other program does use the BDE,
so it is already present running on the computer.
I've been looking at code but just haven't found quite the right combination.
Thanks. Any help is greatly appreciated.

Similar Messages

Is there a way to use the FF vi's to read and write complex data types; specifically, clusters?

I'm trying to interface with a Fieldbus device through LabVIEW. I need to be able to read and write a variable that consists of a cluster of two unsigned int 32's. The FF vi's provided with FF Communications Manager 3.2 do not support clusters. I have tried to use a code interface node to write my own, but the CIN's I was using before to do this function do not give me a device list anymore (they were originally written on Communications Manager 2.3.5). I have recompiled the .lsb, as well as trying to use the older versions of the header and library files. Is there another workaround I can use?

Hello Bryan,
The BrowseDeviceList VI was released within NI-FBUS 3.2. For NI-FBUS Configurator 3.1, please unzip the attached file and copy the "addon" and "Ff" folders into "\vi.lib" directory. LabVIEW 7.1 or above version is required for using these addons.
And for your information, there is a free upgrade (version 3.1.1) for NI-FBUS Configurator 3.1 users. Here is the link to the upgrade kit.
http://digital.ni.com/softlib.nsf/websearch/00A1614EC291219586256F390020671B?opendocument&node=132070_US
Hope it helps!
Regards,
--Josiane
Attachments:
locate_fflv_in_labview82.jpg ‏214 KB
vi.lib.zip ‏391 KB
locate_fflv_in_labview71.jpg ‏193 KB

Urgent: Please help. how to solve the time delay during buffer read and write using vc++

I need to continuously acquire data from daqmx card, write into a file and at the same time corelate (in terms of time) the data with signals from other instruments. The current problem is that there is time delay during read and write data into buffer,thus causing misalignment of the data from multiple instruments. Is there a way to solve the delay? or Is there a way to mark the time of the data acquisition in the buffer? If I know the starting time (e.g. 0) of data acquisition and sampling rate (e.g. 1kHz), can I simply add 1ms to each data sample in the buffer? The current code is shown below.
void DataCollectionWin::ConnectDAQ()
DAQmxErrChk(DAQmxCreateTask ("", &taskHandle));
    DAQmxErrChk(DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai0,Dev1/ai1,Dev1/ai2,Dev1/ai3,Dev1/ai4,Dev1/ai5,Dev1/ai16,Dev1/ai17,Dev1/ai18,Dev1/ai19,Dev1/ai20,Dev1/ai21,Dev1/ai6,Dev1/ai7,Dev1/ai22","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk(DAQmxCfgSampClkTiming(taskHandle,"",1000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,60000));
  DAQmxErrChk (DAQmxRegisterEveryNSamplesEvent(taskHandle,DAQmx_Val_Acquired_Into_Buffer,50,0,EveryNCallback,NULL));// Every 50 samples the EveryNSamplesEvent will be trigured, to reduce time delay.
  DAQmxErrChk (DAQmxRegisterDoneEvent(taskHandle,0,DoneCallback,NULL));
  DAQmxErrChk (DAQmxStartTask(taskHandle));
int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,50,10.0,DAQmx_Val_GroupByScanNumber,data,50*15,&read,NULL));
   //memcpy(l_data,data,6000);
SetEvent(hEvent);
l_usstatus_e[0]=g_usstatus[0];// signals from other instruments that need to be corelated with the data from daq cards.
l_optstatus_e[0]=g_optstatus[0];
if( read>0 ) // write data into file
   //indicator=1;
for (i=0;i<read;i++)
{  //fprintf(datafile,"%d\t",i);
  fprintf(datafile,"%c\t",l_usstatus_s[0]);
  fprintf(datafile,"%c\t",l_usstatus_e[0]);
        fprintf(datafile,"%c\t",l_optstatus_s[0]);
  fprintf(datafile,"%c\t",l_optstatus_e[0]);
          fprintf(datafile,"%.2f\t",data[15*i]);
//   sprintf( pszTemp, "%f", data[6*i]);
// pListCtrl->SetItemText(0, 2, pszTemp);
    //pWnd->m_trackinglist.SetItemText(0, 2, pszTemp);
     fprintf(datafile,"%.2f\t",data[15*i+1]);
     fprintf(datafile,"%.2f\t",data[15*i+2]);

Hello kgy,
It is a bit of a judgment call. You should just choose the board that you think has the most to do with your issue. For example, this issue was much more focused on setting up your data acquisition task than the Measurement Studio environment/tools, so the MultifunctionDAQ board would have been the best place for it. As for moving your post to another board, I do not believe that is possible.
Regards,
Dan King

Can you improve the speed of my CSV Reader and Writer?

hi all, i'm trying to develop a CSV Writer and Reader. i have done a good work to implement the special character and quoting it, it's also support multi line value but it's incredibly slow.
can someone help to make it faster?
here it's how to use the writer
char *stringhe_sorgenti[10] = {0};
out = OpenFile(nfile, VAL_WRITE_ONLY, VAL_TRUNCATE, VAL_ASCII);
for(i = 0; i < sizeof(stringhe_sorgenti)/sizeof(char*); i++){
stringhe_sorgenti[i] = (char*)calloc(200, sizeof(char));
sprintf(stringhe_sorgenti[0], "example1");
sprintf(stringhe_sorgenti[1], "example2");
scrivi_riga_csv(out, stringhe_sorgenti, sizeof(stringhe_sorgenti)/sizeof(char*), formato);
for(i = 0; i < sizeof(stringhe_sorgenti)/sizeof(char*); i++){
free(stringhe_sorgenti[i]);
CloseFile(out);
here is the writer
void scrivi_riga_csv(int file_handle, char *stringa_sorgente[], int numero_stringhe, int formato)
char delimitatore[2][2] = {{',', '\0'}, {';', '\0'}};
char stringa_destinazione[1024] = {0};
int index_destinazione = {0};
int index_start = {0};
int index_fine = {0};
int errore = {0};
int i = {0};
//int k = {0};
size_t lunghezza_stringa = {0};
for(i = 0; i < numero_stringhe; i++){
if(i != 0){
stringa_destinazione[index_destinazione++] = delimitatore[formato][0];
index_start = 0;
lunghezza_stringa = strlen(stringa_sorgente[i]);
// se la stringa sorgente
if( (FindPattern(stringa_sorgente[i], 0, lunghezza_stringa, delimitatore[formato], 0, 0) != -1) // contiene delimitatore
|| (FindPattern(stringa_sorgente[i], 0, lunghezza_stringa, "\"", 0, 0) != -1) // contiene parentesi
|| (FindPattern(stringa_sorgente[i], 0, lunghezza_stringa, "\n", 0, 0) != -1) // contiene a capo
// apro parentesi all'inizio
stringa_destinazione[index_destinazione++] = '"';
// metodo find pattern, piu' complesso ma piu' performante
do{ index_fine = FindPattern(stringa_sorgente[i], index_start, lunghezza_stringa - index_start, "\"", 0, 0);
if(index_fine != -1){
index_fine++;
// copio dall'inizio fino alle virgolette
CopyString (stringa_destinazione, index_destinazione, stringa_sorgente[i], index_start, index_fine - index_start);
index_destinazione += index_fine - index_start;
// ne aggiungo una dopo
stringa_destinazione[index_destinazione++] = '"';
// aggiorno la posizione di start e riparto con il while
index_start = index_fine;
}while(index_fine != -1);
CopyString (stringa_destinazione, index_destinazione, stringa_sorgente[i], index_start, lunghezza_stringa - index_start);
index_destinazione += strlen(stringa_sorgente[i]) - index_start;
// alla fine della riga chiudo la parentesi
stringa_destinazione[index_destinazione++] = '"';
else{
// altrimenti la copio semplicemente e shifto l'indice della stringa di destinazione
CopyString (stringa_destinazione, index_destinazione, stringa_sorgente[i], 0, lunghezza_stringa);
index_destinazione += strlen(stringa_sorgente[i]);
memset(stringa_sorgente[i], 0, strlen(stringa_sorgente[i]));
errore = WriteLine (file_handle, stringa_destinazione, strlen(stringa_destinazione));
if(errore == -1){
errore = GetFmtIOError();
MessagePopup("WriteLine -> WriteLine", GetFmtIOErrorString(errore));
return;
here how to read the file
char *stringhe_sorgenti[10] = {0};
for(i = 0; i < sizeof(stringhe_sorgenti)/sizeof(char*); i++){
stringhe_sorgenti[i] = (char*)calloc(200, sizeof(char));
out = OpenFile(nomearchivio, VAL_READ_ONLY, VAL_OPEN_AS_IS, VAL_BINARY);
leggi_riga_csv(out, stringhe_sorgenti, sizeof(stringhe_sorgenti)/sizeof(char*), formato);
strcpy(intestazione.data, stringhe_sorgenti[1]);
for(i = 0; i < sizeof(stringhe_sorgenti)/sizeof(char*); i++){
free(stringhe_sorgenti[i]);
CloseFile(out);
and here the reader
void leggi_riga_csv(int file_handle, char *stringa_destinazione[], int numero_stringhe, int formato)
char delimitatore[2][2] = {{',', '\0'},
{';', '\0'}};
char stringa_sorgente[1024] = {0};
int stringa_in_corso = {0};
int index_inizio_valore = {0};
int index_doublequote = {0};
int offset_stringa_destinazione = {0};
size_t lunghezza_stringa = {0};
int inquote = {0};
int errore = {0};
int i = {0};
for(i = 0; i < numero_stringhe; i++){
lunghezza_stringa = strlen(stringa_destinazione[i]);
memset(stringa_destinazione[i], 0, lunghezza_stringa);
do{ memset(&stringa_sorgente, 0, sizeof(stringa_sorgente));
errore = ReadLine(file_handle, stringa_sorgente, sizeof(stringa_sorgente) - 1);
// If ReadLine reads no bytes because it has already reached the end of the file, it returns –2.
// If an I/O error occurs, possibly because of a bad file handle, ReadLine returns –1.
// You can use GetFmtIOError to get more information about the type of error that occurred.
// A value of 0 indicates that ReadLine read an empty line.
if(errore == -1){
errore = GetFmtIOError();
MessagePopup("leggi_riga_csv -> ReadLine", GetFmtIOErrorString(errore));
return;
else if(errore == -2){
errore = GetFmtIOError();
MessagePopup("leggi_riga_csv -> ReadLine", "already reached the end of the file");
return;
else{
lunghezza_stringa = errore;
index_inizio_valore = 0;
// metodo find pattern, piu' complesso ma piu' performante
for(i = 0; i <= lunghezza_stringa; i++){
// se come primo carattere ho una " allora e' una stringa speciale
if(inquote == 0){
if(stringa_sorgente[i] == '\"'){
inquote = 1;
index_inizio_valore = ++i;
else{
// altrimenti cerco il delimitatore senza il ciclo for
i = FindPattern(stringa_sorgente, i, lunghezza_stringa - index_inizio_valore, delimitatore[formato], 0, 0);
if(i == -1){
// se non lo trovo ho finito la riga
i = lunghezza_stringa;
if(stringa_sorgente[i - 1] == '\r'){
i--;
if(stringa_in_corso < numero_stringhe){
CopyString (stringa_destinazione[stringa_in_corso], 0, stringa_sorgente, index_inizio_valore, i - index_inizio_valore);
offset_stringa_destinazione = 0;
stringa_in_corso++;
if(stringa_sorgente[i] == '\r'){
i++;
index_inizio_valore = i + 1;
if(inquote == 1){
// se sono nelle parentesi cerco le virgolette
i = 1 + FindPattern(stringa_sorgente, i, lunghezza_stringa - index_inizio_valore, "\"", 0, 0);
if(i == 0){
if(stringa_sorgente[lunghezza_stringa - 1] == '\r'){
lunghezza_stringa--;
// se non le trovo ho finito la riga, esco dal ciclo for
break;
// se incontro una doppia parentesi salto avanti
else if(stringa_sorgente[i] == '\"'){
continue;
// !!!! fondamentale non cambiare l'ordine di questi else if !!!!!
// se incontro una parentesi seguita dal delimitatore
// o se incontro una parentesi seguita dal terminatore
// \r = CR = 0x0D = 13
// \n = LF = 0x0A = 10
// a capo = CR + LF
else if( (stringa_sorgente[i] == delimitatore[formato][0])
|| (stringa_sorgente[i] == '\r')
|| (stringa_sorgente[i] == '\0')
// salvo il valore
inquote = 0;
if(stringa_in_corso < numero_stringhe){
CopyString (stringa_destinazione[stringa_in_corso], offset_stringa_destinazione, stringa_sorgente, index_inizio_valore, i - 1 - index_inizio_valore);
offset_stringa_destinazione = 0;
stringa_in_corso++;
if(stringa_sorgente[i] == '\r'){
i++;
index_inizio_valore = i;
// se sono andato a capo scrivo fino a dove sono e poi procedo con la nuova riga
if(inquote){
if(stringa_in_corso < numero_stringhe){
CopyString (stringa_destinazione[stringa_in_corso], offset_stringa_destinazione, stringa_sorgente, index_inizio_valore, lunghezza_stringa - index_inizio_valore);
strcat(stringa_destinazione[stringa_in_corso], "\n");
offset_stringa_destinazione += lunghezza_stringa - index_inizio_valore;
offset_stringa_destinazione++;
}while(inquote == 1);
// elimino le doppie parentesi
for(i = 0; i < numero_stringhe; i++){
index_doublequote = 0;
do{ lunghezza_stringa = strlen(stringa_destinazione[i]);
index_doublequote = FindPattern(stringa_destinazione[i], index_doublequote, lunghezza_stringa - index_doublequote, "\"\"", 0, 0); // contiene doppia parentesi
if(index_doublequote != -1){
index_doublequote++;
memmove (stringa_destinazione[i] + index_doublequote, stringa_destinazione[i] + index_doublequote + 1, lunghezza_stringa - index_doublequote);
}while(index_doublequote != -1);
return;

the format is CSV, i try to explain better what i'm doing.
our client asked to save acquisition data with header description in an excel readable format, i've decided to use .CSV and not .TDM because it's a simple txt file and we never used .TMD but i will propose to use it.
after some research on the internet i've found nothing to handle .CSV in CVI except from this csv_parse but i've found it difficult to be maintained so i've write it by my own hand.
i've written two example of how to use my function to read or write and i've copyed my function used to read and write.
in the write function i check with FindPattern if the string to be write contain some special character, if i find this i have to quote the string to respect the standard RFC4180 and if i find a quote i have to double it. aftere i've done this check i write the line in the file.
in the read function, that is more complicated, i:
check if the first character is a quote.
if it's not i copy the string until the delimitier or until the end of the line.
if it is i have a string with special character inside so:
i find the first quote in the string. when i've found i check if it's follwed by another quote. this means that in the starting message i was writing a single quote.
if it's not followed by another quote but it's followed by a delimiter or a carriage return i've finished the special line.
if i don't find it it means that the special quote have a carriage return inside and i have to check the next line. before checking the next line i save this in my string.
after this loop i check in every string if i have a double quote and i delete one.
the main problem is in the speed of this, i'm acquiring data at 1000 S/s with 8 active channel for 60 second so i have 480000 data to be stored, divided in 60.000 row and 8 column. to read a file like that my pc stay "locked" for 15 second or more.
i've tried to use the arraytofile function and it's extremly fast and i can also put header because the function can start from the last position in the file but the filetoarray function start from the beginning and i cannot read the header correctly. also if i'm using the european CSV with semicolon as delimiter with arraytofile i cannot select the semicolon but only the coma

When using the Database Connectivity Toolset, reads and writes with long binary fields are incompatible.

I am trying to write LabVIEW Variants to long binary fields in a .mdb file using the Database Connectivity Toolset. I get errors when trying to convert the field back to a variant after reading it back from the database.
I next tried flattening the variant before writing it and ultimately wound up doing the following experiments:
1) If I use DB Tools Insert Data to write an ordinary string and read it back using a DB Tools Select Data, the string is converted from ASCII to Unicode.
2) If I use DB Tools Create Parameterized Query to do an INSERT INTO or an UPDATE operation, specifying that the data is BINARY, then read it back using a DB Tools Select Data,
the length of the string is prepended to the string itself as a big-endian four-byte integer.
I can't think of any way to do a parameterized read, although the mechanism exists to return data via parameters.
Presuming that this same problem affects Variants when they are written to the database and read back, I could see why I get an error. At least with flattened strings I have the option of discarding the length bytes from the beginning of the string.
Am I missing something here?

David,
You've missed the point. When a data item is flattened to a string, the first four bytes of the string are expected to be the total length of the string in big-endian binary format. What is happening here is that preceding this four-byte length code is another copy of the same four bytes. If an ordinary string, "abcdefg" is used in place of the flattened data item, it will come back as <00><00><00><07>abcdefg. Here I've used to represent a byte in hexadecimal notation. This problem has nothing to do with flattening and unflattening data items. It has only to do with the data channel consisting of writing to and reading from the database.
I am attaching three files that you can use to demonstrate the problem. The VI file c
ontains an explanation of the problem and instructions for installing and operating the demonstration.
Ron Martin
Attachments:
TestLongBinaryFields.vi ‏132 KB
Sample.UDL ‏1 KB
Sample.mdb ‏120 KB

Citadel 5 Database: Asymmetry in Read and Write; Database Subfolders

Hi,
I just started using DSC module of LabVIEW and related architecture such as Citedal Database for several days. This might be a trivial issue with easy fix but I could not find documention about this.
When wrting a trace in the databas, a "subfolder" for the PC I am using is automatically generated. It seems that I have no access to the name of the subfolder for the trace I want to write. When reading, it seems I do not have access to the "process" or the "subfolder".
In the attached screenshot: I would like to write an entry to the database that I copied from other PC (the red line), but it is the black line being established. Similar situation happens for trace reading. When I tried to read the green database, it is the blue being read, except I manually delete the blue database.
Attachments:
Multimap.png ‏258 KB

Greetings pai193387
I reproduced your issue on my end. Because of the way Citadel organizes data I could not find a way to just keep working on the process that was started in a different computer. So my suggestion is to read all the data from the process and rewrite it on a new trace and then keep working on the new trace.
Alternatively, it is better to keep small traces separate; in case there is a corruption you don’t lose too many data at a time.
Let us know if you have additional questions or if you find a better solution.
Warm Regards,
Luis J.
Applications Engineer
National Instruments

ORacle 10g - Display database data, edit it and write back to database

Hi!
I would like to find an application which allows me to read data from a database (object-relational database schema), display it visually, make it editable and offer me the opportunity to write changed data to the database.
Does anyone have experience with Visio or some other tool?
Timo

Hi,
thank you for your replies!
I am not sure if the mentioned applications really are what I am looking for. It seems to me that they are developing tools rather than presentation and editing tools. I don't want to present or change the schema but the data of the database. The objects in my database are business processes and the user should be able to get all the information he/she desires about them, be able to edit them and also to create new processes. It's more like a GUI for end users.
Timo

How to read three parameters for exemple temperature,current and voltage from the same port with visa read and separate them in a table

Hi i want to read parameters with visa read, from three sensors related to pic16f877a, using module xbee ..but i want to make every one from those parameters (temperature, voltage and current) in a table ..it's the first time i use Labview so i don't know if ther is a solution for my problem so if any one have any idea please help me. thnx in advance.

[email protected] wrote:
Hi i want to read parameters with visa read, from three sensors related to pic16f877a, using module xbee ..but i want to make every one from those parameters (temperature, voltage and current) in a table ..it's the first time i use Labview so i don't know if ther is a solution for my problem so if any one have any idea please help me. thnx in advance.
The short answer is: "Yes, of course." But you are going to have to do the legwork and learn LabVIEW basics before we can offer meaningful help.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

Hot Data Block with concurrent read and write

Hi,
This is from ADDM Report.
FINDING 8: 2% impact (159 seconds)
A hot data block with concurrent read and write activity was found. The block
belongs to segment "SIEBEL.S_SRM_REQUEST" and is block 8138 in file 7.
RECOMMENDATION 1: Application Analysis, 2% benefit (159 seconds)
ACTION: Investigate application logic to find the cause of high
concurrent read and write activity to the data present in this block.
RELEVANT OBJECT: database block with object# 73759, file# 7 and
block# 8138
RATIONALE: The SQL statement with SQL_ID "f1dhpm6pnmmzq" spent
significant time on "buffer busy" waits for the hot block.
RELEVANT OBJECT: SQL statement with SQL_ID f1dhpm6pnmmzq
DELETE FROM SIEBEL.S_SRM_REQUEST WHERE ROW_ID = :B1
RECOMMENDATION 2: Schema, 2% benefit (159 seconds)
ACTION: Consider rebuilding the TABLE "SIEBEL.S_SRM_REQUEST" with object
id 73759 using a higher value for PCTFREE.
RELEVANT OBJECT: database object with id 73759
SYMPTOMS THAT LED TO THE FINDING:
SYMPTOM: Wait class "Concurrency" was consuming significant database
time. (4% impact [322 seconds])
what does it mean by hot block with concurrent read and write??
is rebuilding the table solves the problem as per addm report?

Hi,
You must suffer from buffer busy waits.
When a buffer is updated, the buffer will be latched, and other sessions can not read it or write it.
You must have multiple sessions reading and writing that one block.
Recommendation 2 results in fewer records per block, so less chance multiple sessions are modifying and reading 1 block. It will also result in a bigger table.
The recommendation doesn't make sense for tablespaces with segment storage management auto, as for those tablespaces pctfree does not apply.
Buffer busy waits will also occur if the blocksize of your database is set too high.
Sybrand Bakker
Senior Oracle DBA

How to read and write a string into a txt.file

Hi, I am now using BEA Workshop for Weblogic Platform version10. I am using J2EE is my programming language. The problem I encounter is as the above title; how to read and write a string into a txt.file with a specific root directory? Do you have any sample codes to reference?
I hope someone can answer my question as soon as possible
Thank you very much.

Accessing the file system directly from a web app is a bad idea for several reasons. See http://weblogs.java.net/blog/simongbrown/archive/2003/10/file_access_in.html for a great discussion of the topic.
On Weblogic there seems to be two ways to access files. First, use a File T3 connector from the console. Second, use java.net.URL with the file: protocol. The T3File object has been deprecated and suggests:
Deprecated in WebLogic Server 6.1. Use java.net.URL.openConnection() instead.
Edited by: m0smith on Mar 12, 2008 5:18 PM

How to burn read and write files on DVD

I would like to know how to burn DVDs (image files) with the Read and Write setting. I have changed the settings in Get Info for the image files to Read and Write for Owner, Group and Others and yet when I burn the DVD and try and copy the files back onto the hard drive (to test if it works or not) it won't allow me. When I check the Get Info it says Read and Write for owner (greyed out) and Read Only for Group and Others (greyed out too).
I have also tried to change the status of the blank DVD before adding files and after adding the files (but b4 the burn) to Read and Write, this works but then during the burn process the DVD or burner changes my settings to Read Only.
I am burning with Finder and have tried with Toast 10 Titanium. What am I doing wrong, or not doing at all?! I'm going loopy with frustration!

Kiraly, I agree that the actual problem here might be something else, but as a side issue there seems to be a difference in the way permissions are handled when a file copy is made using Finder compared to when the copy is made using the cp copy in Terminal. At least in my Tiger system, Finder preserved the permission structure, though not the ownership, when it copied a file, whereas cp used the OS defaults.
I tried the following experiment:
From my test user account "t", I created a textfile named ReadWrite.txt, and gave it Read+Write permissions for Owner, Group, and Others. I then burned it using Finder to a DVD which I named PermissionTest, and then unchecked the "Ignore Ownership" box on PermissionTest.
The original ownership and permissions were preserved on the DVD, though of course you couldn't actually write to anything there:
xxG5-Computer:~ t$ ls -l /Volumes/PermissionTest/ReadWrite.txt
-rw-rw-rw- 1 t t 15 Sep 13 18:25 /Volumes/PermissionTest/ReadWrite.txt
I then copied the file from the DVD to the Desktop using Finder, and the permissions were preserved!
Finder copy:
xxG5-Computer:~ t$ ls -l /Users/t/Desktop/ReadWrite.txt
-rw-rw-rw- 1 t t 15 Sep 13 18:25 /Users/t/Desktop/ReadWrite.txt
I then trashed the Finder copy of ReadWrite,txt on the desktop, and made a second copy from the DVD, but this time I used the cp command from Terminal instead of using Finder. This time the permissions were not preserved, but reverted to the OS default:
cp copy:
xxG5-Computer:~ t$ cp /Volumes/PermissionTest/ReadWrite.txt Desktop
xxG5-Computer:~ t$ ls -l /Users/t/Desktop/ReadWrite.txt
-rw-r--r-- 1 t t 15 Sep 13 19:43 /Users/t/Desktop/ReadWrite.txt
I then switched to a different user account "t1", and repeated the above with the same DVD, first copying the ReadWrite.txt file to the desktop using Finder, and then using cp. The ownership of the copied file changed from t to t1 in both cases, but the permission structure again was preserved in the Finder copy but not in the cp copy:
DVD file:
xxG5-Computer:~ t1$ ls -l /Volumes/PermissionTest/ReadWrite.txt
-rw-rw-rw- 1 t t 15 Sep 13 18:25 /Volumes/PermissionTest/ReadWrite.txt
Finder copy:
xxG5-Computer:~ t1$ ls -l /Users/t1/Desktop/ReadWrite.txt
-rw-rw-rw- 1 t1 t1 15 Sep 13 18:25 /Users/t1/Desktop/ReadWrite.txt
cp copy:
xxG5-Computer:~ t1$ cp /Volumes/PermissionTest/ReadWrite.txt Desktop
xxG5-Computer:~ t1$ ls -l /Users/t1/Desktop/ReadWrite.txt
-rw-r--r-- 1 t1 t1 15 Sep 13 19:51 /Users/t1/Desktop/ReadWrite.txt
I got similar results when I tried copying a file with Read+Write permissions for all from a USB flash drive to the Desktop, again with the "Ignore Ownership" box unchecked.

How do I read and write at the same time using the NI-CAN channel API?

Here's the situation. I have one CAN bus, and I need to read and write channel data (using the channel API) at the same time both at an interval of 20 ms. It's easy to do one or the other using the channel API, but you can't setup a channel task to do both. It's either input or output, not both. Is this even possible?

Hi,
yes , this is possible. But you have to create two tasks, one for input and one for output. see the attached example for LabVIEW.
If you download and install NI-CAN 2.4 you will get this example and one for C and VB as well.
DirkW
Attachments:
Single Sample Input Output same Port.vi ‏79 KB

I used to use the free version of Adobe Reader to convert my publisher files to pdf files. When I was making a booklet for our hockey team, it said I had to buy it. Now I bought it and it won't convert the files. I am ready to throw this computer out the

I used to use the free version of Adobe Reader to convert my publisher files to pdf files. When I was making a booklet for our hockey team, it said I had to buy it. Now I bought it and it won't convert the files. I am ready to throw this computer out the window!! Can you tell me what is the problem? No it does not exceed 100 M. either.

Adobe Reader never converted Publisher files to PDF, for free, never. I suspect you use to have the (paid for) Adobe Acrobat. Sometimes people have Acrobat (more than $300 worth) and install Adobe Reader over the top, losing that valuable software.
That said, if you subscribed to PDF Pack it should do this conversion. What exactly happens now.

I bought an iPad 2. The first charge i made Was from the 86% to 100%. After that i used it. But then i read and in some sites say that it has to be charged 24 hours. So Now i have that question i did it well of wrong?

I bought an iPad 2. The first charge i made Was from the 86% to 100%. After that i used it. But then i read and in some sites say that it has to be charged 24 hours. So Now i have that question i did it well of wrong?

You can charge anytime. You can also plug it in over night if you want because you can never over charge it.
http://www.apple.com/batteries/
http://www.apple.com/batteries/ipad.html

The Microsoft Access database engine cannot open or write to the file \\fileserver\db\access.mdb

Hi,
I have Windows Server 2012 with SQL 2012 Standard SP1. I am using linked server, and Access Database Engine 2010 Redistributable to access my database file made in Microsoft Access (.mdb) from network file server.
EXEC master.dbo.sp_addlinkedserver @server = N'MyLinkedServer', @srvproduct=N'MyLinkedServer', @provider=N'Microsoft.ACE.OLEDB.12.0', @datasrc=N'\\myfileserver.mydomain.com\files\mydatabase.mdb'
My SQL service is running with domain service account MYDOMAIN\SQL1$ , i have added Full control for file share and NTFS permission on my file server folder (C:\Files).
When I open (as domain admin with UAC elevated permissions) on my DB server SQL Management studio, I can browse tables and everything works.
The problem is, if I open SQL management studio (as domain admin with UAC elevated permissions) on my File server or any other computer, when trying to browse my linked server i got error:
TITLE: Microsoft SQL Server Management Studio
Failed to retrieve data for this request. (Microsoft.SqlServer.Management.Sdk.Sfc)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476
ADDITIONAL INFORMATION:
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
Cannot initialize the data source object of OLE DB provider "Microsoft.ACE.OLEDB.12.0" for linked server "Synesis_3PRO2013". (Microsoft SQL Server, Error: 7303)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=11.00.3000&EvtSrc=MSSQLServer&EvtID=7303&LinkId=20476
When I try to place simlpe Select SQL query I got error:
OLE DB provider "Microsoft.ACE.OLEDB.12.0" for linked server "MyLinkedServer" returned message "The Microsoft Access database engine cannot open or write to the file '\\myfileserver.mydomain.com\files\mydatabase.mdb'. It is already opened exclusively by another
user, or you need permission to view and write its data.".
I do not have any other program using my access database, and user has full control. I am trying to use in security mode - "For a login not defined in the list above, connections will be made without using a security context", i have also tried all four options.
I am confused becouse it works from SQL server but from any SQL client domain member computer/server it does not work.
I have same problem in another environment where I have Windows Server 2008 R2 and SQL 2008 R2 SP2.
Please help.
-- Hrvoje Kusulja

NTFS must be fine since it works from same server using same accounts.
As I understand, adding my access file to Access trusted location could be a problem. I have tried now to add my access database file location to trusted locations for user which is my SQL service user (Windows Service - AD managed service account MYDOMAIN\SQL1$)
and my test user which I use to connect to sql server as a client from sql management studio. (Account is Domain Admins and have full permissions on SQL server also)
I have added this .reg:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Access\Security]
[HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Access\Security\Trusted Documents]
"LastPurgeTime"=dword:01592874
"DisablePromptOpenNetworkTrustedDocuments"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Access\Security\Trusted Locations]
"AllowNetworkLocations"=dword:00000001
[HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Access\Security\Trusted Locations\Location0]
"Description"="My file server"
"AllowSubFolders"=dword:00000001
"Path"="\\\\myfileserver.mydomain.com\\files\\"
I have done this for SQL service account user and my personal test account as I said. I have tried to logoff and restart sql service and all servers also.
The same problem still persists.
Anyway, thank you for giving me a hint.

Using the Borland Database Engine to read AND write SHARED Paradox Database Tables

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