Function References > Callback Functions > PAINTCALLBACK_GETDEVICECAPS Function

PAINTCALLBACK_GETDEVICECAPS Function

#include "l_bitmap.h"

L_INT pEXT_CALLBACK YourFunction(pDisplay, nIndex, pUserData)

L_VOID *pDisplay;	device context handle
L_INT nIndex;	index of the capability to retrieve
L_VOID *pUserData;	pointer to additional data

This is the callback that replaces the GetDeviceCaps GDI function.

Parameter	Description
pDisplay	Handle of the device context passed to the paint function.
nIndex	The index of the capability to retrieve.
pUserData	Void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of the PAINTCALLBACKDATA structure.)

Returns

The return values are the same as the return values for the corresponding GDI function.

Comments

The internal display engine calls your callback function if you override the corresponding GDI function in the PAINTCALLBACKDATA structure.

pDisplay is the pDisplay member from the PAINTCALLBACKDATA structure that you passed to the paint function. The default callbacks expect it to be a HDC handle. But, if you override all the paint callbacks, it can be a pointer of any type you want.

PAINTCALLBACK_GETDEVICECAPS Function

Returns

Comments

Example