callLib

Syntax

??? callLib(void *fnptr, ...)

Arguments

fnptr
A pointer (obtained with getLibFn) to the DLL function to call.
...
The other parameters required by the DLL function (varies depending on the function).

Return

Returns the return value of the called DLL function, which varies depending on the function called.

Description

Calls a function in a DLL that has previously been loaded with loadLib and getLibFn.

Example

// This code loads the user32.dll DLL included with Windows and
// uses it to display a YES/NO Message Box.

int lib_user32, functionPointer, returnval;
lib_user32 = loadLib("user32");
if (!lib_user32) msgBox(MB_OK, "Error", "DLL was not loaded");
functionPointer = getLibFn(lib_user32, "MessageBoxA");
if (!functionPointer) msgBox(MB_OK, "Error", "Function wasn't loaded");
strcpy(str0, "The window text is here");
strcpy(str1, "Caption Text");
returnval = callLib(functionPointer, NULL, str0, str1, MB_YESNO);
if (returnval == IDYES) msgBox(MB_OK, "Yes!", "Yes was clicked");
if (returnval == IDNO) msgBox(MB_OK, "No :(", "No was clicked");
freeLib(lib_user32);

Also see

loadLib, getLibFn, freeLib

Comments

Everyone can add their comments about their experiences with this function here. Tips for using it are welcome, too.