Editing getLibFn - FilterMeisterWiki

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= getLibFn =
''Requires FM 1.0 Beta 9.0 (April 2008) or newer''

== Syntax ==
{{int getLibFn(void *dllHandle, char *functionName)}}

== Arguments ==
:'''dllHandle'''
::A handle (obtained with ((loadLib))) to the DLL the function is in.
:'''functionName'''
::The name of the function to get a pointer to.

== Return ==
Returns a pointer to the DLL function.

== Description ==
Locates a specific function in a DLL, allowing you to call the function from within FilterMeister by using ((callLib)).
Behind the scenes, this function is just a wrapper around the [https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getprocaddress GetProcAddress] Win32 API function.

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

int* lib_user32;
int* functionPointer;
int returnval;

// Load the DLL library
lib_user32 = loadLib("user32");
if (lib_user32) {

// Get the function in the DLL
  functionPointer = getLibFn(lib_user32, "MessageBoxA");
  if (functionPointer) {

// Call the function
    strcpy(str0, "The window text is here");
    strcpy(str1, "Caption Text");
    returnval = callLib(functionPointer, NULL, str0, str1, MB_YESNO);

// Process return value
    if (returnval == IDYES)
      msgBox(MB_OK, "Yes!", "Yes was clicked");
    if (returnval == IDNO)
      msgBox(MB_OK, "No :(", "No was clicked");

}
  else msgBox(MB_OK, "Error", "Function wasn't loaded");

// Free the library DLL
  freeLib(lib_user32);

}
else msgBox(MB_OK, "Error", "DLL was not loaded");
</code>

== See Also ==
((loadLib)), ((callLib)), ((freeLib))

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

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