In a DLL I have the following code that conditionally calls the Windows 8 function IsImmersiveProcess(). The DLL does not load on Windows 7 since this function is not present. Because this function is not actually called, what can I do to force the DLL to load into memory ?
if ( IsWindows8OrGreater() )
IsImmersive = IsImmersiveProcess ( GetCurrentProcess() );
Unable to load DLL 'd.dll': The specified procedure could not be found. (Exception from HRESULT: 0x8007007F)
BOOL (WINAPI *pIsImmersiveProcess) ( HANDLE hProcess );
byte IsImmersive = 0;
pIsImmersiveProcess = (BOOL (WINAPI *) ( HANDLE hProcess ))
GetProcAddress ( GetModuleHandle ( L"User32.dll" ), "IsImmersiveProcess" );
if ( pIsImmersiveProcess )
IsImmersive = pIsImmersiveProcess ( GetCurrentProcess() );
As far as the compiler and linker is concerned the function is called.
There are two ways to avoid that:
Exclude the call at compile time so that the compiler knows it isn't called.
Avoid a compile time reference to the function and obtain its address at runtime.
For the first approach, you can specialize a template based on the compile time known Windows version.
But if you want a single DLL for all supported Windows versions, then you need to go with the second approach, essentially using