How to use the IMAQ rval = imgGrab(SESSION_ID sid, void** bufAddr, uInt32 syncOnVB)function?

How to use the IMAQ rval = imgGrab(SESSION_ID sid, void** bufAddr, uInt32 syncOnVB)function?
Please explain the format of "bufAddr" variable?
And how to convert this data to *.bmp format?

Hi arm2arm;
First, are you sure the function prototype says that the variable "bufAddr" is a handle? In the documentation the function prototype looks like:
imgGrab(SESSION_ID sid, void* bufAddr, uInt32 syncOnVB)
Declare a variable as:
Int8* bufAddr = NULL;
When set to NULL, IMAQ will allocate the necessary memory. Then, when using the function, just cast the variable as void.
Use the function imgSessionSaveBufferEx() to save the image as a .bmp file.
Regards;
Enrique
www.vartortech.com

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Any ideas on how to use the IMAQ interpolate 1D vi

I find the Help on this function to be very little. It doesn't say much about typical usage, best practise or examples.
I'm looking for a function where I can pass in an image and a set of coordinates (sub-pixel coordinates) and it would return the interpolated pixel value. I thought this vi would perform this function, but I see it only takes in integer coordinates, so where does the 'sub-pixel' claims come from? If the coordinates are not in a straight line, how does it do the interpolation in 2D? Does the interpolation method specified refer to the path interpolated between the coordinates or the method for interpolating the grey level of the pixel?
Any help would be appreciated.
PS my comment about the Help not being very helpful applies to many other vi's too. We definately need more meat in the help (use Matlab's help as an example).

Hello,
The pixel interpolation function will compute the approximte value of the midpoint pixel of each pair of coordinates you pass to the function. The interpolation type specifies how this pixel value is calculated. There is a little more information on interpolation types used by this function in the LabWindows Vision Concepts manual :
IMAQ_BILINEAR
1
The function uses an interpolation method that interpolates new pixel values using a bidirectional average of the neighboring pixels.
IMAQ_QUADRATIC
2
The function uses an interpolation method that interpolates new pixel values using a quadratic approximating polynomial.
IMAQ_CUBIC_SPLINE
3
The function uses an interpolation method that interpolates new pixel values by fitting them to a cubic spline curve, where the curve is based on known pixel values from the image.
The subpixel accuracy determines how many subpixels to divide the original pixel value into.
When you say the interpolated value between two pixels, do you mean between two adjacent pixels?
Andy C.
National Instruments
Applications Engineering

How can you detect irregular edges using the IMAQ add on?

Im currently trying to use the IMAQ add-on for LabView to detect the edges of an irregular image. I have attached the image I am trying to detect the edges of. I have tried using everything in the "locate edges" sub-pannel (i.e.. imaq find edge, imaq find circular edge etc.) but none of them have yielded any favorable results. I think the "IMAQ edge tool 3 IV" might be what im trying to find however I don't understand how to get any usable data out of it.
Thank you, all comments and help are greatly appreciated.
Attachments:
waveguide.png ‏516 KB

Hi Dander,
I am not sure exactly what types of edges you are trying to acquire, but I used one of the examples from our Example Finder and was able to detect edges on your image. I will say that with the image that you are using, the edges are not very well defined, so you may not get a 100% accurate measurement. The example that I was using uses the IMAQ Edge Tool 3 VI and the example can be found by going in LabVIEW to Help>>Find Examples... From there, you will go to Toolkits and Modules>>Vision>>Functions>>Edge Detection Example.vi. After that, you will remove the build path function and input a path to the image. I hope this helps!
Kim W.
Applications Engineer
National Instruments

Curious, How many people use the IMAQ Vision package?

Yeah, just wondering... how many people here use the IMAQ Vision package on a regular basis?
I do, for one.

Add one to the counter
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

How do I increase the maximum number of images I can acquire in a sequence using the IMAQ 1424 with 80 MB of onboard memory and a Duncan Tech camera?

I've increased the maximum number of buffers to higher than I need, but I still cannot acquire more than 139 images with the Duncan Tech digital video camera before I get a memory lock error. Is there any way to increase the number of images I can acquire in a sequence using the IMAQ 1424 with 80MB of onboard memory?

It sounds like you are already bypassing the onboard memory. If you weren't, you would only be able to acquire about 20 images.
If I understand correctly, you do not convert the images until after you acquire them. This means each acquired image is 4.13 MB, and 139 images will take 574 MB of memory. I wouldn't be surprised if that was all the free memory available on a 1 GB machine. The operating system, LabVIEW and any other software running probably take up the rest of the memory. You might want to put your computer on a diet and minimize the number of other programs and utilities running. The only other option I see is getting more memory if possible.
Is there a way that you can reduce the number of images you need to acquire? Pe
rhaps skipping every other frame? Do you really need more than 139 images?
Is it possible to acquire the images in monochrome? That would triple the number of images that you could acquire.
Bruce
Bruce Ammons
Ammons Engineering

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I have defined a POWL query which executes properly. But if I map the same POWL query to 2 portal users and the 2 portal users try to access the same page simultaneously then it gives an error message to one of the users that
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Can you please tell me how to use the same POWL query for multiple users ?
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Thanks and Regards,
Sandhya

Batch processing usually involves using actions you have recorded. In Action you can insert Path that can be used during processing documents. Path have some size so you may want to only process document that have the same size. Look in the Actions Palette fly-out menu for insert path. It inserts|records the current document work path into the action being worked on and when the action is played it inserts the path into the document as the current work path..

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Okay so I set up my Time Capsule already and is now backing up 2 of my iMacs. Works great. What I want to know is how to use the TC to directly store files? I want to do this to delete some files on iMac 20inch but still have them on the TC for future reference..eg some movies on iTunes. I want to directly save them on the drive so I can delete them from iTunes and gain some storage. (Ps on iMac 20 inch (it's almost full - 320 GB) when I enter time machine, a tab comes up on finder which reads "Time Machine backups" it's able to be ejected like a disc or a connected device. On the iMac 20 inch, I dragged some files onto there as if using it like a hard drive. Is this the correct method? Then I went to my 27inch iMac and saw the "Time Machine Backups" hoping to see the files I dragged from the 20inch iMac. But the files were not there except a folder that said "Backups.backupdb". Can someone help me?

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By the way, you've been misled by poor field labeling on this forum into typing a large part of your message into the field intended for the subject. In the future just type a short summary of your post into that field and type the whole message into the field below that.

JNI - How to use the error reporting mechanism?

I've developed a C++ DLL which is loaded from a commercial Win32 application (not written by me) as a plug-in for external calculations. On its initialization the C++ DLL launches the Java VM via the JNI invocation interface. When the DLL functions are called by the application, they forward the calls to Java objects inside the Java VM, again via JNI invocation interface.
This works well, but I have encountered a weird error.
From Java I open a JFrame containing a JTextArea as small console for debug output messages. If I turn output to this debug console off (my printToConsole routine checks whether a boolean flag is set), the string concatenation operator may lead to a crash of the Java VM.
For example, if in one of the Java functions called from the
DLL via JNI invocation interface the following is the first statement,
it leads to a crash of the Java VM and the application that loaded the C++ proxy DLL.
String test=""+Math.random(); // String test not used later
Interestingly, if I comment this statement out, the Java code works fine WITHOUT any crash. I've already thought about potential races and synchronization issues in my code, but I don't see where this is the case. And the string concatenation error fails as well, if I insert sleep() statements in front of it and at other places in the code. However, if I turn on log messages printed to my JFrame debug console (containing a JTextArea), the String concatenation works without problems.
So maybe the JNI interface has a bug and affects the Java VM; I don't see where my JNI code is wrong.
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Does anyone know how to use the error reporting mechanism?
http://java.sun.com/j2se/1.4.2/docs/guide/vm/error-handling.html
Is it possible that the JVM, when it crashes, writes debug information about the crash into a file instead of stdout/stderr?
My C++ proxy DLL was compiled in debug mode, but the commercial application (which loaded the DLL) is very likely not.
I do not know hot to find the reason why the String concatenation fails inside the Java function called from the C++ DLL via JNI.

Yes, I've initially thought about errors in the C++ code too. But the C++ code is actually very simple and short. It doesn't allocate anything on the C++ side. It allocates a couple of ByteBuffers inside the Java VM however via JNI invocation interface calls of env->NewDirectByteBuffer(). The native memory regions accessed via the ByteBuffers are allocated not by my own C++ code, but by the program that calls my DLL (the program is Metastock).
The interesting thing is that everything works fine if output to my debug console is enabled, which means that in the Java print routine getConsoleLoggingState() returns true and text is appended to the jTextArea.
static synchronized void print(String str)
{ MetaStockMonitor mMon=getInstance();
if ( mMon.getFileLoggingState() && mMon.logFileWriter!=null) {
mMon.logFileWriter.print(str);
mMon.logFileWriter.flush();
if ( mMon.getConsoleLoggingState() ) {
mMon.jTextArea1.append(str);
Only if output to the JTextArea is turned off (ie. getConsoleLoggingState()==false), the crash happens when the FIRST statement in the Java routine called via JNI invocation interface is a (useless) String concatenation operation, as described above.
String test=""+Math.random(); // String test not used later
Moreover, the crash happens BEFORE the allocated ByteBuffer objects are accessed in the Java code. But again, if console output is turned on, it works stable. If console output is turned off, it works when the (useless) String concatenation operation is removed in the Java routine called from C++.
I've already thought about potential races (regarding multiple threads), but this can be ruled out in my case. It almost appears as if the JVM can have problems when called by the invocation interface (I tested it with Java 1.4.2 b28).
All the calls between C++ and Java go ALWAYS in the direction from C++ code to Java. Unfortunately, there is no special JRE version with extensive logging capabilities to facilitate debugging. And the problem is not easily reproducible either.
JNIEnv* JNI_GetEnv()
JNIEnv *env;
cached_jvm->AttachCurrentThread((void**)&env,NULL);
fprintf(logfile,"env=%i\n",env);
fflush(logfile);
return env;
// function called by Metastock's MSX plug-in interface
BOOL __stdcall createIndEngine (const MSXDataRec *a_psDataRec,
const MSXDataInfoRecArgsArray *a_psDataInfoArgs,
const MSXNumericArgsArray *a_psNumericArgs,
const MSXStringArgsArray *a_psStringArgs,
const MSXCustomArgsArray *a_psCustomArgs,
MSXResultRec *a_psResultRec)
a_psResultRec->psResultArray->iFirstValid=0;
a_psResultRec->psResultArray->iLastValid=-1;
jthrowable ex;
jmethodID mid;
JNIEnv* env=JNI_GetEnv();
jobject chart=getChart(env, a_psDataRec);
if ( chart==NULL) {
return MSX_ERROR;
jobject getChart (JNIEnv* env, const MSXDataRec *a_psDataRec)
jthrowable ex;
jmethodID mid;
int closeFirstValid, closeLastValid;
closeFirstValid=a_psDataRec->sClose.iFirstValid;
closeLastValid=a_psDataRec->sClose.iLastValid;
long firstDate, firstTime;
if (closeFirstValid>=1 && closeFirstValid<=closeLastValid) {
firstDate = a_psDataRec->psDate[closeFirstValid].lDate;
firstTime = a_psDataRec->psDate[closeFirstValid].lTime;
} else {
firstDate=0;
firstTime=0;
jclass chartFactoryClass = env->FindClass("wschwendt/metastock/msx/ChartFactory");
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot find class ChartFactory\n");
printSBufViaJava(sbuf);
return NULL;
mid = env->GetStaticMethodID(chartFactoryClass, "getInstance", "()Lwschwendt/metastock/msx/ChartFactory;");
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot find method ID for ChartFactory.getInstance()\n");
printSBufViaJava(sbuf);
return NULL;
jobject chartFactory=env->CallStaticObjectMethod(chartFactoryClass, mid);
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Exception while calling ChartFactory.getInstance()");
printSBufViaJava(sbuf);
return NULL;
mid = env->GetMethodID(chartFactoryClass, "getChartID", "(Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;IIIIIII)F");
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot find method ID for ChartFactory.getChartID()\n");
printSBufViaJava(sbuf);
return NULL;
jobject symbolBuf=env->NewDirectByteBuffer(a_psDataRec->pszSymbol, strlen(a_psDataRec->pszSymbol) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate symbolBuf\n");
printSBufViaJava(sbuf);
return NULL;
jobject securityNameBuf=env->NewDirectByteBuffer(a_psDataRec->pszSecurityName, strlen(a_psDataRec->pszSecurityName) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate securityNameBuf\n");
printSBufViaJava(sbuf);
return NULL;
jobject securityPathBuf=env->NewDirectByteBuffer(a_psDataRec->pszSecurityPath, strlen(a_psDataRec->pszSecurityPath) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate securityPathBuf\n");
printSBufViaJava(sbuf);
return NULL;
jobject securityOnlineSourceBuf=env->NewDirectByteBuffer(a_psDataRec->pszOnlineSource, strlen(a_psDataRec->pszOnlineSource) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate onlineSourceBuf\n");
printSBufViaJava(sbuf);
return NULL;
// Java Function call leads to crash, if console output is turned off and
// the first statement in the Java routine is a (useless) string concatenation.
// Otherwise it works stable.
jfloat chartID=env->CallFloatMethod(chartFactory, mid, securityNameBuf, symbolBuf,
securityPathBuf, securityOnlineSourceBuf, (jint)(a_psDataRec->iPeriod),
(jint)(a_psDataRec->iInterval), (jint)(a_psDataRec->iStartTime),
(jint)(a_psDataRec->iEndTime), (jint)(a_psDataRec->iSymbolType),
(jint)firstDate, (jint)firstTime );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Exception while calling ChartFactory.getChartID()");
printSBufViaJava(sbuf);
return NULL;

How to use the t-code vf31 tor taking print out of invoice

Hi,
How to use the t-code vf31 for taking print out,am getting an error like no message for initial processing exist,
venu

Hi,
Please find the steps
Output type                     RD00
Transmission medium             1
Sort order                      01
Processing mode                 1
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Hello Prasad,
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Hi,
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Best regards,
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Event 01: Before Saving the Data in the Database
Use
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hidden entry processing
fill hidden fields
flag data to be written to hidden tables after the database change.
To have the changes saved by the central maintenance dialog routines, SY-SUBRC must be set to 0 at the end of the routine.
Realization
This event has no standard routine. The following global data is available for the realization of the user routine:
internal table TOTAL
field symbols
field symbols <ACTION> and <ACTION_TEXT>
<STATUS>-UPD_FLAG
If internal table data are to be changed before saving, t he changes should be made in both the internal table TOTAL and in the internal table EXTRACT.
FORM abc.
DATA: F_INDEX LIKE SY-TABIX. "Index to note the lines found
LOOP AT TOTAL.
IF <ACTION> = desired constant.
READ TABLE EXTRACT WITH KEY <vim_xtotal_key>.
IF SY-SUBRC EQ 0.
F_INDEX = SY-TABIX.
ELSE.
CLEAR F_INDX.
ENDIF.
(make desired changes to the line TOTAL)
MODIFY TOTAL.
CHECK F_INDX GT 0.
EXTRACT = TOTAL.
MODIFY EXTRACT INDEX F_INDX.
ENDIF.
ENDLOOP.
SY-SUBRC = 0.
ENDFORM.
Regards,
Joy.

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My flex project works fine using the below but when I upload my flash file to the server I doesn't work, all the relative paths and files are the same execpt the remote one is a linux server.
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paul.williams wrote:
You are confusing "served from a web-server" with "compiled on a web-server". Served from a web-server means you are downloading a file from the web-server, it does not necessarily mean that the files has been generated / compiled on the server.
The server.name and server.port tokens are replaced at runtime (ie. on the client when the swf has been downloaded and is running) not compile time (ie. while mxmlc / ant / wet-tier compiler is running). You do not need to compile on the server to take advantage of this.
Hi Paul,
In Flex, there is feature that lets developer to put all service-config.xml file configuration information into swf file. with
-services=path/to/services-config.xml
IF
services-config.xml
have tokens in it and user have not specified additional
-context-root
and this swf file is not served from web-app-server (like tomcat for example) than it will not work,
Flash player have no possible way to replace token values of service-config.xml file durring runtime if that service-config.xml file have been baked into swf file during compilation,
for example during development you can launch your swf file from your browser with file// protocol and still be able to access blazeDS services if
-services=path/to/services-config.xml
have been specified durring compilation.
I dont know any better way to exmplain this, but in summary there is two places that you can tell swf about service confogiration,
1) pass -services=path/to/services-config.xml parameter to compiler this way you tell swf file up front about all that good stuff,
or 2) you put that file on the webserver( in this case, yes you should have replacement tokens in that file) and they will be repaced at runtime .

How to use the IMAQ rval = imgGrab(SESSION_ID sid, void** bufAddr, uInt32 syncOnVB)function?

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