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).
I don't have issues in debug mode, this error happen in exe mode.
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.
Another problem with specifying the full path to a copy of such a DLL is that LabVIEW will think you need to have this specific DLL in a built application and will include it in the build. However your user32.dll is almost 200% VERY incompatible to just about any other Windows system out there, because of Windows version, Service Pack, and bug fix upgrades as well as different language versions of Windows.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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