What is Loadlibrary doing with sa_api.dll and ftd2xx.dll?

I have a C program that fails to load sa_api.dll.

The main points –

This entry is similar to another one I submitted, “Python 2.7 ctypes sa_api.dll Windows 10 1803 1903”, but is using C instead of Python and attached is a Process Monitor logfile showing thread activity.

You can see from the Process Monitor logfile is that sa_api.dll is loaded and then ftd2xx.dll is loaded. Loadlibrary returns NULL and a call to GetLastError returns 126 which means the module was not found.

This program succeeds on an older computer with Windows 10 1803 and fails on a newer computer with Windows 10 1903 or 1909. I don’t know if that is the cause of the failure but it is a difference.

The details –

The source code –
#include <stdio.h>
#include <windows.h>

int main()
{
HINSTANCE ll_handle;
int status;
DWORD err;

ll_handle = LoadLibrary(“sa_api.dll”);
if (ll_handle != NULL)
{
printf(“LoadLIbrary returned not NULL. We have a handle.\n”);
}
else
{
err = GetLastError();
printf(“LoadLibrary returned NULL\n”);
printf(“GetLastError %d”, err);
}

return 0;
}

Compiled with MinGW, gcc 8.2.0

Files in the directory –
sh1.exe
sa_api.dll from Spike 3.4.2
ftd2xx.dll from Spike 3.4.2

Running the program on the newer computer with Windows 10 1909 –
>sh1
LoadLibrary returned NULL
GetLastError 126
>

Error code 126 is ERROR_MOD_NOT_FOUND, “The specified module could not be found.”

From Process Monitor (sysinternals.com) logfile –

11:53:53.2685325 … Load Image …\sa_api.dll SUCCESS …
11:53:53.2792824 … Load Image …\ftd2xx.dll SUCCESS …

Attached is the logfile that shows all the thread activity. It does load both dll’s and every event has a result of SUCCESS.

Do the dlls sa_api.dll and ftd2xx.dll depend on the Microsoft .NET Framework? The older computer has version 4.7.03056 and the new computer has 4.8.03752.

Do you know if these dll’s have run on a computer with Windows 1903 or 1909? Can you try that?

Can you think of any other examination I can do?

Thanks for whatever help you can provide. At this point I can’t use an SA124B or SA44B with a new computer.

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