Windows api

does anyone know a good link to the windows api documentation and maybe some good tutorial for using it.
thanks

thanks for the replys. I'll download the sdk and try to see how it goes from there.

Similar Messages

How to refresh the text which is display by windows API function 'findwindow' 'getdc' 'textout'!

i use the windows api function to dynamelly display text on the frontpanel ,it successed ,but when you move the scrollbar to the left ,right ,top ,bottom,the text will be disappear!! i think it is a very difficulteed problem .in my around ,no one can do! who can help me!
Attachments:
textrefresh.vi ‏21 KB
auto_appear_scroll.vi ‏126 KB

Very cool!
It looks like you are using the same functions that LV uses to refresh the screen. Thos functions only let you update within the window you specify. This is why your updates stop at teh edge of the window.
Normally LV will watch the scroll bar position and re-paint the screen to reflect an scroll bar postion changes. Since you are by-passing LV, you can not rely on LV to refresh your screen when the scroll bars move.
At this point I can offer two suggestions.
1) Continue with the approach you started and start adding all of the code required to watch the scroll bars and re-paint as indicated.
or
2) Look into the LV Picture control. Based on what you have done using dll calls I would guess that you could probably figure how to do the
same thing using a picture control. The Picture (being a LV native object) is fully supported by LV so the scrolling work is already done and working. The picture control will let you draw lines, insert text, etc. Take a look at the "Robot Arm" example. It should get you started.
Finally, the Picture control is pure "G" so it should be platform independent.
Otherwise let me commend you on your example. You say no one else where you are can do what you have done. After looking at your example, I am not suprised. There are few people in the world that can do what you have done.
Great work!
Ben
Ben Rayner
Certified LabVIEW Developer
www.DSAutomation.com
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

LV memory leak - How to use windows API SetProcessWorkingSetSize (from Kernel32.dll)

Hi fellow LV'ers
Okay - this is a bit tricky, but i'll try and explain the problem, then ask for the solution, because it may be that someone knows a better way to deal with this.. might get a bit long, sorry - if a solution comes up this will enable all of us to make more memory efficient LV code so please read on..
Here is the deal:
When building even a very simple LV executable, looking at the windows task manager will yield a rather large amount of memory allocated for such a small program - and the only way to free this up is by physically clicking the windows minimize button, then suddenly the amount drops to only a few MB and upon maximizing the window again the memory consumption will increase somewhat again, but for a simple VI build to an exe this move may change the consumption from +70MB to less than 15 MB.. This is irregardless of the code you put in the VI, so no coding example in this post as it is how LV works - you can even test it with the development environment - look at the task mgr and check LabVIEW's memory consumption, minimze ALL open NI windows incl project explorer etc, and you will see a significant decrease in memory usage even after maximizing again.. This has annoyed me since day one, but since RAM is a near zero cost these days it is not something I stay awake at night to think about.. However - I have moved into the "publish to web" tools now, wanting to do a remote monitoring part for my application for my customers to experience increased usability from the software i sell them..
All is well, publishing is really easy (i use the monitor function, NOT the embeded, as customers need not have Labview RunTimeEngine installed, because they might look at it from a non RTE supported platform such as a mobilephone web browser)
Everything is working fine also for the build application. However - I have noticed that once users start to remote monitor the running application - memory consumption of the running LV application starts to increase - and it keeps doing so - to such an extend that you can drain the computer complete and run off the cliff with a windows error... This is off course not very productive for me, being specialized in measurement applications that usually runs for a long period of time - I initially thought that I had done some poor programming in the VI used to display on the webpage - but it turns out that I can reproduce this behaviour with a simple boolean on an empty front panel..
NI support has been informed, and they admit there is a problem, but so far solutions from them has been a bit too exotic for my taste, and thus I'm seeking the help of fellow LV programmers...
You see - The method to solve the increasing memory consumption, is the exact same as mentioned above..minimize the application running with the "minimize" button and all memory will be freed, as soon as you maximize the application and users are viewing it remotely, the memory usage raises again, and history repeats... As previously mentioned, minimizing the window via normal LV calls to property nodes does not yield the same result, nor does a request deallocation of a VI(When you profile a project, there are no VI's increasing in memory, it is the LV process it self doing it)
After many many hours googling I stumbled upon this:
http://support.microsoft.com/?kbid=293215
I believe trimming the process with SetProcessWorkingSetSize would solve this problem, and now I would really like to be able to do this in my program, so that users are not forced to minimize the program every X hour depending on their system size...
However - I have absolutely NO experience in calling windows API from LV, i need someone with that knowledge to provide an example of how to call this.. I've looked at examples on how to do calls to windows API - there is an example in this forum with some llb's in it, and I have gained a fair understanding of how parameters are passed between the calls, but none of those include the "hProcess" handle that is apparently needed for this specific winAPI call to work - Anyone in this forum with the knowledge on how to obtain this handle from a VI, if at all possible, and could provide an example VI for me to use - or even better , someone with the knowledge of how to do this within LV it self??
Your help is much appreciated
Best Regards
Jacob
LV8.6.1 patch something
Win XP
Solved!
Go to Solution.

Hi Enrico
Finally I can give something to the community that has given me so much :-)
The "official" statement is that "yes we know it is a problem".. Not sure what that will do to the future..
I have the problem on 8.6.1 as well - and in fact it is a general LV problem, that I first time reported to NI with LV8.2 as I was pissed by the fact that even the smallest exe file would consume + 50MB of memory until you manually minimized the window. Well - thanks to the feedback from Cosmin I seem to have solved the problem.
I most warn that having started to "empty process" once in a while has led to occasional program crashes in the lethal "app.exe performed an illegal action and is closed" windows dialog - however what I did was to move the webserver to a seperate exe file and then communicate the data that I want to use via datasocket in a cluster.. It works like a charm and I simply stall the single thread that the webserver is running when ever the empty process is called and I have not seen a crash since then.. (the initial implementation was done in the main app with 4 parallel loops running, and I guess that was a disaster waiting to happen)
Either way - what I have done is made a VI that at a user defined interval calls the empty process, simply by getting the .exe name from the task manager of the calling program - it is simple and very effective. I call it every 5 minutes - needless to say that flushing too often will most likely kill performance of the system. I have not noticed problems with VM - are you sure you are not storing large arrays or moving around copies of data not used frequently?
For future reference to this forum, it is attached here including the .dll required to call - it is a LV8.6.1 file as I have not had the time to yet again test every single function of my program for new problems that could occur with upgrading to LV2009
I hope this solves your problem..
best regards
Jacob
www.10EaZy.com
Attachments:
EmptyProcess.zip ‏32 KB

Lion server file sharing issue with windows API read/write ini file (GetPrivateProfileString)

Hello,
I try to config lion server as file server for a windows application we use at work. All other computers are windows 7 or XP, lion server is the only mac. I choose lion server because it's size, quality and personal love of apple products.
10.7.2 lion server's samba file sharing works almost perfectly with all my windows machines, I can copy, delete, modify any text files or office files without any issue, but the most important windows application for my business doesn't work with samba file sharing. After some digging, I found it is because windows program can't read or write INI file stored on lion share. Windows API GetPrivateProfileString always returns empty if the INI file is store on lion share.
You can download a small application for read/write windows INI file from codeproject.com to test this problem:
http://www.codeproject.com/KB/files/ini.aspx
I can open/edit the in file using any text editor without any problem. The only problem is with those windows APIs. ACL is turned on for my lion share and assigned "delete" rights to samba users.
I install samba3 on the same server; it works perfectly with windows API. My windows program also works. Looks like there is something wrong with lion server's sambax.
I'd prefer to use built-in samba even I have samba3 working. Built-in samba is very immature right now, but considered how young it is, I will give apple some time to make it mature.
Does anyone have same issue or knows how to fix it?
Thanks,
Michael.

All the memory is fine. The server rarely if ever goes down when there are only around 10-12 users connected. When there are 20+ users connected and working heavily it goes down often. When I say working heavily, I mean they are transferring huge files to the SAN (100GB+), sometimes 5 at a time per user, and there are a bunch of others who are reading large video files at a minimum of 220MB/sec from the SAN.
Though this worked on Snow Leopard without any issues, Lion just doesn't seem to be able to handle it. The odd thing is, on Snow Leopard there was only a single 1GB ethernet connection to a NAS system, whereas with Lion we have a much more powerful machine with a 6-port 10GB ethernet card and a 4 lane 8GB fiber card to a true SAN. You would think that the newer scenario with Lion would handle far more users with ease.
So far, very disappointing with regards to Lion's file serving performance.

Using Windows API in my LabWindows CVI code

Hi all.
I would like any and all help. I am developing on LabWINDOWS 2010 and am trying to use the Windows API, particularly the multimedia APIs, in my CVI code. What I am trying to do is audio development, only it has to be in .NET or Visual C++ platform. I have developed the code and UIR, but when I build the solution it tanks on me. Of course when I use MS Visual C++ 2008 or 2010 there are no errors and I could use MS Visual C++ to develop my application, but the development of the user interface and the controls is much more straight forward with CVI and there are more controls to work with than there are with MS Visual C++. Most of the errors that I get are related to the following header files: "MMSystem.h", "devicetopology.h", and the "endpointvolume.h". When I try and build a skelton project with no controls or indicators on the .UIR I get the errors like:
"devicetopology.h"(2301,20) Missing parameter type.
"devicetopology.h"(2301,40) syntax error; found '*' expecting ')'.
"MMSystem.h"(151,1) Unrecognized declaration.
"MMSystem.h"(850,96) syntax error; found 'identifier' expecting ')'.
That is just a few of them, but they typically say the same thing. I have included the header files and libraries in my project, and have made sure that they are in the CVI "sdk" directory. I have tried example code that have these header files and the result is still the same. I know that I should not have these type of issue, at least I don't think I should. Like I said I could use as much help as possible of figuring out what is the matter. Did I install the CVI improperly? Are there patches that I need to actually use windows APIs? I am attaching to this post my code and the code I downloaded from a LabWINDOWS forum. When I ran the code from the forum I got the same errors.
Thanks in advance.
Attachments:
AudioVolume.c ‏2 KB
VISTAS-OpenAL.c ‏44 KB

Humphreyy,
thanks for the tip. I tried it but it did not work, the same errors were present. Are there any other suggestions. I have racked my brain to figure out why this is happening and have come up with nothing. I am also getting a "Warning" message concerning the "KsMedia.h" file that says "Warning: Excess characters in multibyte character literal ignored." The warnings trace back to the "typedef enum" section of that file. Could that be causing a ripple effect that produces the error I am seeing in the other header files I mentioned??
I could really use your help and any more help that is available. I really don't want to use Visual C++, because this software is going to get more sophisticated and is to be used in NASA Langley's VISTAS simulator, an environment taylor made for National Instruments software.

How to use the windows API GetCaretPos with FireFox? It works with IE

I want to get caret position from a windows desktop application using the Windows API GetCaretPos. It works in any windows Application and in IE. It worked also in FireFox for some minutes in version 3.6.8 but than it stopped working. Can anyone tell me how to make it work?
== This happened ==
Every time Firefox opened

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
Note: ''This will temporarily log you out of all sites you're logged in to.''
To clear cache and cookies do the following:
#Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
#Under "Time range to clear", select "Everything".
#Now, click the arrow next to Details to toggle the Details list active.
#From the details list, check ''Cache'' and ''Cookies'' and uncheck everything else.
#Now click the ''Clear now'' button.
Did this fix your problems? Please report back to us!

Windows API ANSI version and UNICODE version

Windows API have two version:
ANSI version and UNICODE.
I want to display chinese, so i use the UNICODE version. but i find it's some mistake.
and later, i change to ANSI version, it's correct.
why the ANSI version can display chinese, and UNICODE can't.
i use the api function
FindWindowA
GetWindowTextA
who can tell me?

I understand Vista is a 32 bit.
IE 8 is what I have but I would consider IE 9 if that would be necessary.
Just a bit more update. I just tried to download Adobe FP 10 again with the following results, again:
The Adobe Download Manager windows shows:
FP 10.3 Status as 100% "Installation Pending".
FP 10.2 Status as 100% " Instatlling Application"
and that will go one forever but never really actually installs anything and just keeps cycling through the "Add to Download" e.g. "Fanbase", "Times Reader"
and "Adobe Air" (none of which I want added to the download), and the download and installation shows as 100%.
Go figure!

How to get IPv6 site prefix via Windows API?

Hello,
we need urgent help. We have to automatically configure a postgres sql server. For this reason we need to determine the IPv6 site prefix. Using windows command line this is pretty easy:
netsh interface ipv6 show siteprefix
We are only interested in the site prefixes themselves, e.g. no lease time is needed. We want to get this information via Windows API.
For this purpose we use GetAdaptersAddresses function. Within the result of
FirstPrefix the needed information is included. But it's much to much information and it's not clear for us how to filter the result. We need always
exact the same result like the command above produces.
Any help or hint would be very very appreciated.
Greg

Hi Valery,
I mean a Portal Resource..
Inside portal, when a go to properties of a specific document, in tab "Access Link" it shows a "Short Id".
I'd like to know via API how to get this Id, or any other Code that it's unique for every resource or document in portal.
Thank you!

Windows API help files (Installation question)

I've been working in LabWindows/CVI for a few weeks, and have added some API calls. They work fine. However, when I go to Help/Windows API, I get the following message:
"The Win32 API documentation has not been installed. You can install the documentation from the LabWindow/CVI Platform DVD."
I have the Developer's suite DVDs, and ran the installer on the first, selected a custom install of LabWindows/CVI and saw that all the help files were installed, as were all the Windows API support files. In fact, the only things which weren't installed were the wizards for VS 200x. I tried installing the MSDN files, which is a bit of a help (I can go search on it), but, it's a bit big and slow compared to a normal help file.
What am I missing to install this?

Hi Steve,
There was a problem with the MSDN help installer that shipped with VS 2009. It installs the help correctly, but CVI 2009 is not able to link to them because of a registry incompatibility. You have a couple of possible workarounds:
a) if you have CVI 9.x, and you still have the "MSDN Library Documentation" DVD that came in that package, you should install it and the help link from CVI 2009 should then work.
b) or you can simply get the same help online. Just browse to msdn.microsoft.com and enter the name of the function that you want to get for.
Luis

Re: Calling Windows API from Tool

Hi,
If it's only for the UserName on NT you can get the environment variable
USERNAME.
Hope this helps,
Daniel Nguyen
Freelance Forte Consultant
Url : http://perso.club-internet.fr/dnguyen/
Tim Sawyer a écrit:
Hi George,
I think you need to find out which Windows DLL implements the function and
then wrapper it, using Forté's C Wrappering technique. I'm going to be
doing this for the GetUserName() function, so we can login to our
application automatically, using the username that the user logged into NT
with.
Hope this helps!
Tim Sawyer
PanCredit
Leeds, UK.
From: Aberdour George <[email protected]>
Date: Thu, 6 May 1999 09:08:03 +1000
Subject: Calling Windows API from Tool
Hi,
Does anyone know how to call Windows API calls such as WinExec,
CreateProcess, RegSetValue, etc directly from TOOL ?
These are just examples calls. I know some Windows API calls can be called
via equivalent OperatingSystem method calls, but I would really like toknow
if it is possible to call Windows API routines directly.
Thanks in advance,
George Aberdour
TAFE NSW-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

I'm afraid we have to make it work for NT, 95 and probably 98 too, so we're
looking for something a bit more robust than the environment variable.
Thanks,
Tim Sawyer
PanCredit
Leeds, UK.
From: Daniel Nguyen[SMTP:[email protected]]
Reply To: [email protected]
Sent: 07 May 1999 20:40
To: Tim Sawyer
Cc: '[email protected]'; '[email protected]'
Subject: Re: Calling Windows API from Tool
Hi,
If it's only for the UserName on NT you can get the environment variable
USERNAME.
Hope this helps,
Daniel Nguyen
Freelance Forte Consultant
Url : http://perso.club-internet.fr/dnguyen/
Tim Sawyer a écrit:
Hi George,
I think you need to find out which Windows DLL implements the functionand
then wrapper it, using Forté's C Wrappering technique. I'm going to be
doing this for the GetUserName() function, so we can login to our
application automatically, using the username that the user logged intoNT
with.
Hope this helps!
Tim Sawyer
PanCredit
Leeds, UK.
From: Aberdour George <[email protected]>
Date: Thu, 6 May 1999 09:08:03 +1000
Subject: Calling Windows API from Tool
Hi,
Does anyone know how to call Windows API calls such as WinExec,
CreateProcess, RegSetValue, etc directly from TOOL ?
These are just examples calls. I know some Windows API calls can be
called
via equivalent OperatingSystem method calls, but I would really like toknow
if it is possible to call Windows API routines directly.
Thanks in advance,
George Aberdour
TAFE NSW-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

Dereferencing a pointer from a Windows API call within labview

I was looking into using the CreateFile windows API funciton within a labview project I'm working on. I found some C code to do essentially what I want to do with this fuction (c code and details are within the attached VI). Unfortanatly its return type is a pointer to a pointer and I got a bit
lost when I looked into how to dereference this pointer to a value. By
the way WinBase.h defines INVALID_HANDLE_VALUE as:
#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)
Essentially I need to detect when CreateFile returns INVALID_HANDLE_VALUE to feed into a larger labview program I'm working on.
So is it possilble to dereference this pointer or should I be looking for another way of getting the same result?
Attached is the basic mechanism I worked up - the dereferencing block is disabled because it doesn't work. I looked into the memblock() (CIN function) to do the dereferencing but couldn't find all the pieces to that puzzel yet.
Thanks for your help,
Christopher
Attachments:
File IO - is file open3-GetValueByPointer.vi ‏18 KB

Just use "open/create/replace" file in LabVIEW. It should return an error if the file is already open. Just check for that error. If it isn't already open, yes it will open it, but just close it right after.
CLA, LabVIEW Versions 2010-2013

Calling Windows API From Forms.

For example, how can i call the MessageBoxA function from user32.dll whilst working in an Oracle Forms Application.
Thank you.

You shall have to use the WEBUTIL_C_API.Invoke_Int function for this purpose. Please see the following example that Locks the workstation.
-- IMPORTANT
-- Be sure to review the following My Oracle Support Note
-- Doc ID: 285331.1 - "Exception When Calling PASCAL style Function Via WebUTIL_C_API"
declare
rc pls_integer;
     f_handle WEBUTIL_C_API.FUNCTIONHANDLE;
     args Webutil_c_api.parameterlist;
     winSysDir varchar2(255) := Client_Win_API_ENVIRONMENT.Get_Windows_Directory || '\system32\';
--- IMPORTANT ---
-- WEBUTIL_C_API CURRENTLY ONLY SUPPORTS CALLING C STYLE LIBRARIES, THEREFORE SOME WINDOWS LIBRARIES CANNOT BE CALLED.
-- ADDITIONALLY, IT IS NOT RECOMMENDED THAT YOU ATTEMPT TO CALL FUNCTIONS WHICH REQUIRE ARGS.
-- USE EXTREME CAUTION WHEN CALLING WINDOWS APIS.
-- BE SURE TO THOROUGHLY TEST BEFORE MOVING TO PRODUCTION
-- LOOK CLOSELY AT BOTH STABILITY AND MEMORY USAGE AS SOME CALLS
-- MAY RESULT IN THE APPEARANCE OF A MEMORY LEAK.
-- This call to USER32.DLL will reference the LOCKWORKSTATION function.
-- If the current OS user does not have a password configured, the workstation may not lock.
-- The Windows LockWorkStation function requires no args to be passed in.
-- WebUtil expects something to be passed in. So an empty paramlist will be created.
begin
If webutil_clientinfo.get_operating_system LIKE 'Win%' Then
     f_handle := WEBUTIL_C_API.register_function(winSysDir||'user32.dll','LockWorkStation');
     args := WEBUTIL_C_API.create_parameter_list;
If the function succeeds, the return value is nonzero. Because the function executes asynchronously,
a nonzero return value indicates that the operation has been initiated. It does not indicate whether
the workstation has been successfully locked. If the function fails, the return value is zero.
    http://msdn.microsoft.com/en-us/library/aa376875(v=VS.85).aspx
     rc := WEBUTIL_C_API.Invoke_Int(winSysDir||'user32.dll','LockWorkStation',args);
End if;
WEBUTIL_C_API.Destroy_Parameter_List(args);
WEBUTIL_C_API.Deregister_Function(f_handle);
SYNCHRONIZE;
end;

Implementing Windows API Shell Execute call

I am trying to implement the Windows API call in LabVIEW named ShellExecute. I have created the attached VI and I do not understand why it will not run correctly. I am hoping that a user on the forum will see the problem and be able to suggest what is wrong. Thank you for any help!
Attachments:
ShellExecute.vi ‏43 KB

Remove the quotation marks from the list of strings for your commands and it will work.
You also don't need them for the path, but there they don't seem to make a difference.
Also, instead of using a multi-line string, you can use a property node to get the string values of the ring and index array to pick the right string.
Try to take over the world!

Where can I find a description of what the Windows APIs do , such as NIDAQErrorHandler?

I would like to know how to use these Windows APIs, where can I find a description?
thanks

Check this post here
Bilal Durrani
NI
Bilal Durrani
NI

Accessing the Windows API

All,
We're trying to wrap the windows API PostMessageA method using a Forte
C Project library.
I would like to have some detailed discussions with anybody who has done
this or wrapped other
windows API calls.
We've worked around this by creating a C DLL which provides an
interface to PostMessageA,
but the better solution is to call the API directly.
Thank you for your help,
Keith Kroeger

Yes, we tried this, $top=10&$skip=0 works for the following url
https://<hostname>:30006/<subscription-id>/services/systemcenter/vmm/VirtualMachines?$top=10&$skip=0
It is only when we add $expand=VirtualNetworkAdapters,
the server returns the mentioned error response -
URL for which the server returns the 500 error -
https://<hostname>:30006/<subscription-id>/services/systemcenter/vmm/VirtualMachines?$expand=VirtualNetworkAdapters&$top=10&$skip=0
Can
you point to the error logs for Windows Azure Pack and SPF ?

Windows api

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