Adding a Window Property

The following example loads an icon and then a cursor and allocates memory for a buffer. The example then uses the SetProp function to assign the resulting icon, cursor, and memory handles as window properties for the window identified by the application-defined hwndSubclass variable. The properties are identified by the strings PROP_ICON, PROP_CURSOR, and PROP_BUFFER.

#define BUFFER 4096

HINSTANCE hinst; // handle of current instance

HWND hwndSubclass; // handle of a subclassed window

HANDLE hIcon, hCursor;

HGLOBAL hMem;

char *lpMem;

TCHAR tchPath[] = "c:\\winnt\\samples\\winprop.c";

// Load resources.

hIcon = LoadIcon(hinst, MAKEINTRESOURCE(400));

hCursor = LoadCursor(hinst, MAKEINTRESOURCE(220));

// Allocate and fill a memory buffer.

hMem = GlobalAlloc(GPTR, BUFFER);

lpMem = GlobalLock(hMem);

lstrcpy(lpMem, tchPath);

GlobalUnlock(hMem);

// Set the window properties for hwndSubclass.

SetProp(hwndSubclass, "PROP_ICON", hIcon);

SetProp(hwndSubclass, "PROP_CURSOR", hCursor);

SetProp(hwndSubclass, "PROP_BUFFER", hMem);

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