I was making a DLL that changes the icon of a gamemaker game while the game is running. To do this I need the hwnd of the gamemaker window. I assume you can pass it into a DLL function as an argument by using the gml function window_handle() but I'm having a few problems. First of all, that's not a string or a real and I'm not sure what to set it to in Gamemaker (in the define_external() function). Second, Im not sure if window_handle() returns the handle to the correct window (mabey GM uses 2 or 3??). Can anyone explain how to get the window handle for a gamemaker game?


EDIT: also if I make a function do something like GetModuleHandle(NULL) in a DLL, dose it do it for the DLL, or for the window using the DLL?

i guess u r using cpp. set window handle arg type in gm to ty_real. and in ur cpp code take arg as double and do this.

HWND handle =(HWND)(DWORD)hand

where the hand is "double hand" in ur function. so handle is the window handle of gm, so u can do nething with it for ex
CloseWindow(handle)

Dose that include sending a message (like WM_CLOSE)? I tried, but to no avail.

u can use any function where the handle of window is required.

yeah, now that I think of it, the message loop has to be somewhere in a delphi program too