The OpenEdge Hive

Hi John,

Thanks for helping me with this.

As I'm not particularly tied to using Visual Studio 2003, I downloaded VC++ Express.
Apart from some strcopy warnings, the error I see now is:

error C2664: 'LoadLibraryW' : cannot convert parameter 1 from 'const char *' to 'LPCWSTR'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast 
        or function-style cast

At first I tried simply casting vmlib to an LPCWSTR, using

    handle = LoadLibrary((LPCWSTR) vmlib);

but it didn't like that approach very much - it compiled, but the handle kept coming back as NULL so it didn't want to load the JVM library.

Looking around on the web, I dropped the cast again and could make it compile by adding this bit of code, as per instructions from http://www.codeguru.com/forum/showthread.php?t=231165 :

	// Load the library
	int lenA = lstrlenA(vmlib);
	int lenW;
	BSTR unicodestr;
	lenW = ::MultiByteToWideChar(CP_ACP, 0, vmlib, lenA, 0, 0);
	if (lenW > 0)
	{
		// Check whether conversion was successful
		unicodestr = ::SysAllocStringLen(0, lenW);
		::MultiByteToWideChar(CP_ACP, 0, vmlib, lenA, unicodestr, lenW);
	}
	else
	{
		// handle the error
		return outCharErr("Could not convert the path to the JVM library");
	}
	handle = LoadLibrary(unicodestr);
	// when done, free the BSTR
	::SysFreeString(unicodestr);

However, when I used the 'Debug' build DLL from Progress, it showed the same error as before:

Run-Time Check Failure #0 - The value of the ESP was not properly saved across a function call.
This is usually a result of calling a function declared with one calling convention with a 
function pointer declared with a different calling convention.

If I use the 'Release' build DLL then Progress simply crashes.

As you may have guessed, I am not a C/C++ guy. I'm fine with 4GL/ABL and Java, but C++ continues to baffle me.

Do you by any chance have a working 'Solution' folder that I could download and take apart?
Thanks in advance for any help you can provide!

Jan Schenkel.

Hi Jurjen,

That did the trick, indeed - once I found where that setting could be altered in the IDE ;-)

If anybody else is wondering: right-click on the Project (not the Solution) ; go to Configuration properties > General ; in the right-hand list, change Project Defaultys > Character Set to 'Not set'
Oh, and it's best to start from an empty project.

That got the original code working, and then I snipped away what I didn't need and modified what I wanted different. And now it all comes together - great stuff!

Thanks for all your help,

Jan Schenkel.