CeGetWindowLong (RAPI) (Windows CE 5.0)
This function retrieves information about the specified window. CeGetWindowLong also retrieves the 32-bit (long) value at the specified offset into the extra window memory of a window.
CeGetWindowLong is a remote application programming interface (RAPI), which enables an application running on a desktop computer to make function calls on a Windows CE–based device.
LONGCeGetWindowLong( HWNDhWnd, intnIndex);
Parameters
hWnd
[in] Handle to the window and, indirectly, the class to which the window belongs.nIndex
[in] Specifies the zero-based offset to the value to be retrieved. Valid values are in the range 0 through the number of bytes of extra window memory, minus four; for example, if you specified 12 or more bytes of extra memory, a value of 8 would be an index to the third 32-bit integer. To retrieve any other value, specify one of the following values.Value Description GWL_EXSTYLE Retrieves the extended window styles. GWL_STYLE Retrieves the window styles. GWL_WNDPROC Retrieves the address of the window procedure, or a handle representing the address of the window procedure. You must use the CallWindowProc function to call the window procedure. GWL_ID Not supported. GWL_USERDATA Retrieves the 32-bit value associated with the window. Each window has a corresponding 32-bit value intended for use by the application that created the window. Windows CE 2.0 and later support this value, but Windows CE 1.0 and 1.01 do not. The following values are also available when the hWnd parameter identifies a dialog box.
Value Description DWL_MSGRESULT Retrieves the return value of a message processed in the dialog box procedure. DWL_USER Retrieves extra information private to the application, such as handles or pointers.
Return Values
The requested 32-bit value indicates success. Zero indicates failure. To get extended error information, call CeGetLastError.
Remarks
The nIndex parameter must be a multiple of 4 bytes.
Unaligned access is not supported.
When working with RAPI for Windows CE 1.0 and 1.01, use the PegGetWindowLong function. This function does not support the DWL_DLGPROC value in the nIndex parameter.
Requirements
OS Versions: Windows CE 2.0 and later.
Header: Rapi.h.
Link Library: Rapi.lib.
See Also
RAPI Functions | CallWindowProc | CeGetLastError | RegisterClass | SetParent | SetWindowLong | WNDCLASS
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