How can I call a exported function using ordinal number

Question

If a dll exports some functions and the functions have only ordinal numbers, how can I call the functions?

Give me a short example please.

Rutter

Answer 1

The documentation for GetProcAddress explains that you pass the integer ordinal in the low-order word of the lpProcName parameter. The MAKEINTRESOURCE macro can actually be used to make this a little easier:

int ordinal = 123;
HANDLE dll = LoadLibrary("MyDLL.dll");
FARPROC fn = GetProcAddress(dll, MAKEINTRESOURCE(ordinal));

Ultramicroscopic

I don't know why this does not work in my case: #47283345 – Pangenesis

You need to call (PCSTR)ordinal in UNICODE projects. – Threegaited

It's actually MAKEINTRESOURCEA(ordinal) to make it compatible with UNICODE projects. – Cabretta