🚀 go-pugleaf

Muzzy wrote:

> Hi,
> 
> I hope someone can help:
> 
> I have a dll which exports:
> 
> extern "C" __declspec(dllexport) bool VPNStart();
> 
> I also have an app, which wants to call the dll and get the address of 
> "VPNStart":
> 
> 
> typedef bool (HVPNSTART)(void);
> 
> bool VNCStart(void)
> {
>   HINSTANCE hLib = LoadLibrary("VPNCHK32.DLL");
>   if (hLib == NULL) {
>     MessageBox(0, "Unable to Load VPNCHK32.DLL", "Error", MB_OK);
>     return false;
>   }
>   HVPNSTART* vs = (HVPNSTART*)GetProcAddress(hLib, "_VPNStart");
>   if (vs == NULL) {
>     MessageBox(0, "Failed calling VPNStart", "Error", MB_OK);
>     FreeLibrary(hLib);
>     return false;
>   }
>   MessageBox(0, "VPNStart Loaded!", "SUCCESS", MB_OK);
> 
>   FreeLibrary(hLib);
>   return true;
> }
> 
> 
> It doesn't work - vs gets NULL value, although "_VPNStart" shows when i 
> dump the DLL.
> My only thought that i messed somewhere with typecasts in calling 
> function, incorrectly defined HVPNSTART...
> 
> 
> Any ideas?
> 
> Thank you,
> Andrey
> 


typedef bool* (*HVPNSTART)(void);

bool VNCStart(void)
{
   HINSTANCE hLib = LoadLibrary("VPNCHK32.DLL");
   if (hLib == NULL) {
     MessageBox(0, "Unable to Load VPNCHK32.DLL", "Error", MB_OK);
     return false;
   }
   HVPNSTART* vs = (HVPNSTART*)GetProcAddress(hLib, "_VPNStart");
   if (vs == NULL) {
     MessageBox(0, "Failed calling VPNStart", "Error", MB_OK);
     FreeLibrary(hLib);
     return false;
   }
   MessageBox(0, "VPNStart Loaded!", "SUCCESS", MB_OK);

   bool result = vs();

   FreeLibrary(hLib);
   return result;
}

Now compiler says that vs is non-function and i can't call it?