What is this error (process 16500) exited with code -1073740940. ?

Question

Hi,

When I build my small Visual Basic Console program I get this message on the console;

"
H:\My Program Projects MS VS 2019 Community\Swe_Version Function Testing\bin\Debug\netcoreapp3.1\Swe_Version Function Testing.exe (process 16500) exited with code -1073740940."

What does this mean?

Please let me know how to rectify it.

Thanks
VKSBK

Answer 1

I suspect that even when you tried to use StringBuilder that you declared the function as returning a String. This is a problem. The char* pointer that the unmanaged function _swe_version@4 returns will not be properly marshaled to a managed string and this is a source of the heap corruption error.

This will fail -

    Public Declare Function swe_version Lib "swedll32.dll" Alias "_swe_version@4" (ByVal strVersion As StringBuilder) As String  

This will succeed -

    Public Declare Function swe_version Lib "swedll32.dll" Alias "_swe_version@4" (ByVal strVersion As StringBuilder) As IntPtr  

This will succeed -

    Public Declare Sub swe_version Lib "swedll32.dll" Alias "_swe_version@4" (ByVal strVersion As StringBuilder)  
  

Answer 2

Dear RLWA32,

That is much better & easier to understand. Thanks.

Thanks
Kind regards
VKSBK