Cdecl Calling Convention

The process for using the cdecl calling convention is similar to the process for using the std calling convention. They differ principally in the second parameter for GetProcAddress. Note the comments that precede that call.

# ifdef JDENV_PC
HINSTANCE hLibrary = LoadLibrary(_TEXT(YOUR_LIBRARY.DLL)); // substitute the name⇒
 of the external dll
if(hLibrary)
{
// create a typedef for the function pointer based on the parameters and return⇒
 type of the function to be called. This information can be obtained
// from the header file of the external dll. The name of the function to be called⇒
 in the following code is StartInstallEngine. We create a typedef for
// a function pointer named PFNSTARTINSTALLENGINE. Its return type is BOOL. Its⇒
 parameters are HUSER, LPCTSTR, LPCTSTR, LPTSTR & LPTSTR.
// Substitute these with parameter and return types for the particular API.
typedef BOOL (*PFNSTARTINSTALLENGINE) (HUSER, LPCTSTR, LPCTSTR, LPTSTR, LPTSTR);
// Now create a variable for the function pointer of the type you just created.⇒
 Then make call to GetProcAddress function with the first
// parameter as the handle to the library you just loaded. The second parameter⇒
 should be the name of the function you want to call. In this
// case it will be StartInstallEngine only. The GetProcAddress API will return a⇒
 pointer to the function that you need to call.
PFNSTARTINSTALLENGINE lpfnStartInstallEngine = (PFNSTARTINSTALLENGINE) GetProc⇒
Address(hLibrary, StartInstallEngine);
if ( lpfnStartInstallEngine )
{
// Now call the API by passing in the requisite parameters.
lpfnStartInstallEngine(hUser, szObjectName, szVersionName, pszObjectText, szObject⇒
Type);
}
#endif

Note: These calls work only on a Windows client machine. LoadLibrary and GetProcAddress are Windows APIs. If the business function is compiled on a server, the compile will fail.