SetProp

http://www.vckbase.com/index.php/wv/473

	
CString g_szPropName = "Your Prop Name";
HANDLE	g_hValue = (HANDLE)1;

//设置窗口属性
SetProp(m_hWnd,g_szPropName,g_hValue);

HANDLE h = GetProp(hwnd,g_szPropName);
if( h == g_hValue)
{
	*(HWND*)lParam = hwnd;
	return false;
}

LONG_PTR SetWindowLongPtr(      

    HWND hWnd,
    int nIndex,
    LONG_PTR dwNewLong
);

Parameters

hWnd

[in] Handle to the window and, indirectly, the class to which the window belongs. The SetWindowLongPtr function fails if the window specified by the hWndparameter does not belong to the same process as the calling thread.

nIndex

[in] Specifies the zero-based offset to the value to be set. Valid values are in the range zero through the number of bytes of extra window memory, minus the size of an integer. To set any other value, specify one of the following values.

GWL_EXSTYLE

Sets a new extended window style. For more information, seeCreateWindowEx.

GWL_STYLE

Sets a newwindow style.

GWLP_WNDPROC

Sets a new address for the window procedure.

GWLP_HINSTANCE

Sets a new application instance handle.

GWLP_ID

Sets a new identifier of the window.

GWLP_USERDATA

Sets the user data associated with the window. This data is intended for use by the application that created the window. Its value is initially zero.

The following values are also available when the hWndparameter identifies a dialog box.

DWLP_DLGPROC

Sets the new pointer to the dialog box procedure.

DWLP_MSGRESULT

Sets the return value of a message processed in the dialog box procedure.

DWLP_USER

Sets new extra information that is private to the application, such as handles or pointers.

dwNewLong

[in] Specifies the replacement value.

Return Value

If the function succeeds, the return value is the previous value of the specified offset.

If the function fails, the return value is zero. To get extended error information, callGetLastError.

If the previous value is zero and the function succeeds, the return value is zero, but the function does not clear the last error information. To determine success or failure, clear the last error information by calling SetLastError(0), then call SetWindowLongPtr. Function failure will be indicated by a return value of zero and a GetLastError result that is nonzero.

LONG_PTR GetWindowLongPtr(     

    HWND hWnd,
    int nIndex
);

hWnd

[in]

Handle to the window and, indirectly, the class to which the window belongs.

If you are retrieving a pointer or a handle, this function supersedes the GetWindowLong function. (Pointers and handles are 32 bits on 32-bit Windows and 64 bits on 64-bit Windows.) To write code that is compatible with both 32-bit and 64-bit versions of Windows, use GetWindowLongPtr.

nIndex

[in] Specifies the zero-based offset to the value to be retrieved. Valid values are in the range zero through the number of bytes of extra window memory, minus the size of an integer. To retrieve any other value, specify one of the following values.

GWL_EXSTYLE

Retrieves the extended window styles. For more information, seeCreateWindowEx.

GWL_STYLE

Retrieves thewindow styles.

GWLP_WNDPROC

Retrieves the pointer to the window procedure, or a handle representing the pointer to the window procedure. You must use theCallWindowProcfunction to call the window procedure.

GWLP_HINSTANCE

Retrieves a handle to the application instance.

GWLP_HWNDPARENT

Retrieves a handle to the parent window, if there is one.

GWLP_ID

Retrieves the identifier of the window.

GWLP_USERDATA

Retrieves the user data associated with the window. This data is intended for use by the application that created the window. Its value is initially zero.

The following values are also available when the hWndparameter identifies a dialog box.

DWLP_DLGPROC

Retrieves the pointer to the dialog box procedure, or a handle representing the pointer to the dialog box procedure. You must use the CallWindowProcfunction to call the dialog box procedure.

DWLP_MSGRESULT

Retrieves the return value of a message processed in the dialog box procedure.

DWLP_USER

Retrieves extra information private to the application, such as handles or pointers.

Return Value

If the function succeeds, the return value is the requested value.

If the function fails, the return value is zero. To get extended error information, callGetLastError.

If SetWindowLongor SetWindowLongPtrhas not been called previously, GetWindowLongPtr returns zero for values in the extra window or class memory.