Retrieving a Window Property

A window can create handles to its window property data and use the data for any purpose. The following example uses GetProp to obtain handles to the window properties identified by PROP_ICON, PROP_CURSOR, and PROP_BUFFER. The example then displays the contents of the newly obtained memory buffer, cursor, and icon in the window's client area.

#define PATHLENGTH 256

HWND hwndSubclass; // handle of a subclassed window

HANDLE hIconProp, hCursProp;

HGLOBAL hMemProp;

char *lpFilename;

TCHAR tchBuffer[PATHLENGTH];

int nSize;

HDC hdc;

// Get the window properties, then use the data.

hIconProp = (HICON) GetProp(hwndSubclass, "PROP_ICON");

TextOut(hdc, 10, 40, "PROP_ICON", 9);

DrawIcon(hdc, 90, 40, hIconProp);

hCursProp = (HCURSOR) GetProp(hwndSubclass, "PROP_CURSOR");

TextOut(hdc, 10, 85, "PROP_CURSOR", 9);

DrawIcon(hdc, 110, 85, hCursProp);

hMemProp = (HGLOBAL) GetProp(hwndSubclass, "PROP_BUFFER");

lpFilename = GlobalLock(hMemProp);

nSize = sprintf(tchBuffer,

"Path to file: %s", lpFilename);

TextOut(hdc, 10, 10, tchBuffer, nSize);