Question

Well, i am having some issues with an error that i don’t understand.

These are the two related files:

Inside DLLExporter:

#ifdef LOGGER_EXPORTS
    #define LOGGER_API __declspec(dllexport) __stdcall
#else
    #define LOGGER_API __declspec(dllimport) __stdcall
#endif

typedef long (CALLBACK *LPFNTIMER)( void );

// Exported Functions
bool LOGGER_API Initialize( std::string filename, bool ShowConsole = true );
bool LOGGER_API Release( void );
bool LOGGER_API SetTimer( LPFNTIMER );

bool LOGGER_API Initialize(std::string filename, bool ShowConsole)
{
    [...]
}

bool LOGGER_API Release()
{
    [...]
}

bool LOGGER_API SetTimer(LPFNTIMER fn)
{
    [...]
}

inside DLLExporter.def

LIBRARY DLLExporter.dll
EXPORTS
    Initialize
    Release
    SetTimer 

inside DLLImporter:

typedef long (__stdcall *LPFNTIMER)( void );

typedef bool (__stdcall *LPFNINITIALIZER)( string, bool );
typedef bool (__stdcall *LPFNTIMERSETUP)( LPFNTIMER );
typedef bool (__stdcall *LPFNRELEASER)( void );

[...]


long __stdcall TimerFunc()
{
    return 0;
}

[...]

if (g_DLLExporter == NULL)
    return false;

LogInit = (LPFNINITIALIZER)GetProcAddress(g_DLLExporter, "Initialize");
LogRelease = (LPFNRELEASER)GetProcAddress(g_DLLExporter, "Release");
LogTimer = (LPFNTIMERSETUP)GetProcAddress(g_DLLExporter, "SetTimer");

if ( LogInit == NULL || LogRelease == NULL || LogTimer == NULL)
    return false;

if (!LogInit("test.log", true))
    return false;

if (!LogRelease())
    return false;

if (!LogTimer(TimerFunc))
    return false;

This code runs all the way through to the LogTimer call which fails, with the Run-Time Check Failure #0 message.

Run-Time Check Failure #0 – The value
of 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.

I have already noted the __stdcall issues reported elsewhere, but as you can see above i have that included, and i even forced the __stdcall calling convention in the project properties (MSVS 2010). Any thoughts as to why i would get the error only on the timer function and not on the init or release functions?

Answer 1

Just thinking, perhaps if you call LogTimer() before LogRelease()?

And what about passing the proper parameters to Initialize and SetTimer?