Win32 API user32.dll SendInput function help

I'm looking for and example that uses the Win32 API user32.dll SentInput function.

Hi, you find the required information in the MSDN online:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winprog/winprog/windows_api_reference.asp
and more specific the "SendInput" at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardinput/keyboardinputreference/keyboardinputfunctions/sendinput.asp
Regards,
Mattias Ericsson
Endevo (www.endevo.se)
Gothenburg, Sweden

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How do you use the windows User32.dll Library functions to read variables from other applications that are running

I am trying to read a text box from a programme running at the same time as my Labview application using calls to the Windows
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Thanks

If you're trying to access information that's being displayed in the window of another application and that application has no ActiveX interface, then yes, Windows calls can be used. There's a very good example on calling DLLs that ship with LabVIEW. Open the Example Finder (Help->Find Examples) and switch to the Search tab. Enter "Call" in the search box and open the VI "Call DLL". Run the VI, select any of the examples, and click the "Open Example VI..." button. That shows you how to call a DLL.
Now, given that you have no experience in calling DLLs, have only an "understanding" of C (which to me means you have never written something like a DLL), and don't seem to know that much about what Windows functions you may need, you're going to find this route pretty difficult, especially since you have to deal with Windows API calls, which are not always that easy to do from LabVIEW.
Let me propose an alternate solution. Go over to http://www.autoitscript.com/autoit3/ and download AutoIt. This is an automation tool that allows you to automate just about anything you want. It has an ActiveX interface that you can call from LabVIEW. I've attached an example VI that shows you how to use it to get the value of a text box from one of the tabs in the computer "System Properties" control panel applet.
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AutoIt Example (v7).vi ‏25 KB

LabVIEW call Win32 API DLL function from third party

Hi everyone,
I'm trying to build a LabVIEW 2010 interface on 32-bit Window XP system to configurate and communicate to an Anglient laser head through its USB expansion box. I contacted the vendor and they shared a win32 API with some dll files. I started with a function called "A55292Find", but the CLF node always pop up error 1097.I checked the MSDN to get the corresponding LabVIEW data type for CLF.
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Here is what I have from API documents about this function:
The A55292Find function returns lists of handles and board types for all the 55292 USB
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A55292RC __cdecl A55292Find(
HANDLE hBoxes[], // List of handles for the boxes found. (as Unsigned 32-bit integer numeric)
BOARDTYPE PortABrdType[], // List of board types for slot A boards (as Unsigned 16-bit integer numeric)
BOARDTYPE PortBBrdType[], // List of board types for slot B boards (as Unsigned 16-bit integer numeric)
WORD *spMaxBoxes); // dimension for all of the passed arrays. (as Unsigned 16-bit integer array data pointer)
// (function return type as Unsigned 32-bit integer numeric)
Parameters
HBoxes[] Array that will receive the list of HANDLES for all the 55292 boxes connected.
PortABrdType[] An array that will receive Slot ‘A’ board type information for each 55292 box.
PortBBrdType[] An array that will receive Slot ‘B’ board type information for each 55292 box.
spMxBoxes Passes the maximum number of values that can be held in hBoxes, PortABrdType, and PortBBoardType arrays to the A55292Find routine and returns the actual number of boxes found
The return value will be one of the following A55292RC return codes:
Value Meaning
A55292_NO_ERROR No error
A55292_TIMEOUT Timeout accessing a shared memory
Remarks
This routine must be called to obtain handles and board type information used in calling all the other routines. If there are significantly more array elements than boxes, the routine will take longer to complete.
These are the definitions:
typedef DWORD A55292RC; enum{A55292_NO_ERROR, A55292_HANDLE_ERROR,...}
typeder WORD BOARDTYPE; enum{A55292_PCAL_BOARD, A55292_NO_BOARD, ...}
Thanks a lot,
Kang
Solved!
Go to Solution.
Attachments:
call A55292Find.vi ‏10 KB

nkang11 wrote:
Hi Mr. Kalbermatter,
As you told me, I should try to use the defined enumeration words as control and indicator.
For the previous CLF node, it successfully returned the hardware configuration (I have only connected a board at slot A):
But I really want to see a string return as "A55292_PCAL_BOARD" which is defined by "typedef WORD BOARDTYPE; enumeration {...}; Does that mean I need to change the data type or do something like "converter"? Or initialize the array first, then convert it to string type?
Right now, I'm trying to open the laser card by using "A55292PcalOpen(HANDLE hDev, SLOTSELECT SlotSelector);" function which requires to use the enumeration constants from " typedef WORD SLOTSELECT; enum {A55292_PORT_A, A55292_PORT_B};" but I'm confused to shot an constant control to a new CLF node.
Since almost all of the arguments in dll function are typedefined as WORD, short and struct et al, I hope you could give me some hints on it.
Thank you very much sincerely!
Kang
Depending on the actual C implementation you can simply create a LabVIEW enum with the according item names or use a ring control instead. Teh enum requires the numeric values of the items to be in consecutive order without any gaps in between. This is a given if the C definition never assigns a specific number to the item. If the C enum is not consecutive you need to go with a ring control instead.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Does anyone have an example VI about how to call the animatewindow function in the user32.dll using CLN in Labview?

I want to call the WinAPI function-animatewindow in user32.dll to produce some special effect when showing or hidding windows, but i don't know how to using this Win API to achieve my purpose?
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You have to use the Call Library Function Node to call Windows API functions. The animatewindow function itself has some pretty simple parameters. You first need to get the window handle. There are a set of Windows API Function Utilities (32-bit) for LabVIEW that you can use. In there there is a VI (Get Window Refnum) that gets the window handle. It's a simple call to a Windows API function. You would call the animatewindow function in the same way. In this case there are 3 parameters: the window handle (returned by a FindWindow API call), a DWORD (32-bit integer) for the duration, and another DWORD for the flags.

What are analogous shared libraries that can be called using a call library function to user32.dll and lvtoolbox.dll when using Linux and Mac?

I am wondering if anyone is familiar with how to get similar information with a LV program using a Linux shared library as well as the corrolate Mac library to the Windows user32.dll and lvtoolbox.dll. I specifically am trying to get system metrics such as screen resolution information and cursor information as well as being able to set mouse position. I am trying to convert a LV Windows program to these other operating systems and I am unfamiliar with these platforms.
Thanks for your time - I really appreciate it.

There is no simple answer to that. On Linux you will likely have to call into X Server, which would be a pain to do, due to various versions and implementations of that. On the Mac there would be the difficulty that you can't call into the native ObjectiveC API but would need to find a Carbon API or something like that to do what you want.
If you seriously want to do something like this for multiplatform, you should bite the bullet and start coding an intermediate shared library in C. This library would export a LabVIEW friendly C API and access whatever system API you need to have for the particular functions. But multiplatform programming on this level is a pain in the ass, no matter what.
Message Edited by rolfk on 04-21-2010 08:26 AM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Calling a Single Threaded Win32 API/DLL

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It shouldn't matter as long as you make sure that multiple threads aren't calling functions in that DLL at the same time. You can ensure this by either synchronizing your methods in Java or writing a multithreaded stub DLL that synchronizes calls to the single-threaded DLL for you.

With java how to call a function offered by user32.dll?

Hi,everyone.
Please think about my question.Now i want to retrieve all the user's
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can you please offer me a piece of code like it. but
the dll should be available with the OS,such as
user32.dll,kernal32.dll ...ect, not the one using jni
to generate.You cannot directly call C functions in this way. You have to use JNI. Have your native method written to normal JNI standards call the functions in the OS. Your native method will also have to take care of creating the data structures needed to make the OS call and also creating the Java data structure you want to return.

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Sorry F. McLion, I could have provided the following additional information:
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Odly after I removed then re-installed v3.3, the pictures I was working
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Microsoft XP Home edition V 2002 Service Pack 3
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Windows API dll (user32.dll) cause fatal error

Hi,
On a setup, we using a touch screen. The LabView Software is running on full screen. I need to deactivage my front panel if the screensaver is on to prevent user start anyting. I use SystemParametersInfoA from user32.dll and this is working good, except, if I quit the software. "myexe a fin a error and need to close" (someting like that, my XP is in french).
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I use LV 8.6.1. Do you have any idea why?
Thank you
Solved!
Go to Solution.
Attachments:
test.zip ‏10 KB

CFiset wrote:
Thank, I will take care of this details. But, unfortunly, this not working.
uint32_t SystemParametersInfoA(uint32_t SPI, uint32_t 0, uint32_t *value, uint32_t False);
SPI = 114 = SPI_GETSCREENSAVERRUNNING
If *value != 0, screensaver ON, else scresaver OFF
Still have the fatal Windows error.
Thank
I noticed the Call Library Node having a rather strange path to user32.dll on the initial load. Do you happen to have copied that DLL somewhere and referencing it with full path in your VI?
That is a very big NO-NO! user32.dll and many other Windows system DLLs do weird things to the system and are utterly bad behavioured if you try to load another copy from somewhere else on disk than the system directory. Just change the library name to user32.dll only and let Windows pick the right DLL from its system directory.
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Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Richt Click Mouse with user32.dll and String Constant for Escape Key

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Hi,
The mouse_event function has been superseded by the sendinput command. To learn more about the function calls with user32.dll, have a look at the msdn.com website. The user32.dll website is shown here. The syntax for the mouse_event function is shown below:
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Hello.
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Kameralina
Ask NI (ni.com/ask)
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TIA,
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Waldemar,
Thank you very much for your insight.
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Cheers,
Jaegen

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http://www.ni.com/support/

Win32 API user32.dll SendInput function help

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