/// <summary>
/// Enumerate windows by calling the specified callback proc for each top-level
/// window in the system. If a custom object is specified this object will
/// also be passed to the callback proc (allows the callback proc to modify
/// state, build a list, etc.)
/// </summary>
/// <param name="callbackProc">callback proc</param>
/// <param name="customParam">custom data</param>
public static void EnumerateChildWindows(IntPtr hWndParent, EnumerateChildWindowsDelegate callbackProc, bool visibleOnly, object customParam)
{
// create delegate that will be used for call to native EnumWindows function
// (also create a GC handle to prevent the delegate from being garbage collected
// during the call to EnumWindows!)
EnumWindowsDelegate enumWindowsProc = new EnumWindowsDelegate(EnumWindowsProc);
GCHandle hEnumWindowsProc = GCHandle.Alloc(enumWindowsProc);
// Create the custom parameter that will be passed to EnumWindows and allocate
// a GC handle for it so we can pass it as the LPARAM to the native EnumWindows
EnumWindowsParam param = new EnumWindowsParam(callbackProc, visibleOnly, customParam);
GCHandle hParam = GCHandle.Alloc(param);
try
{
// enumerate windows
User32.EnumChildWindows(hWndParent, enumWindowsProc, hParam);
}
finally
{
// free GC handles used for enumerating windows
hEnumWindowsProc.Free();
hParam.Free();
}
}
/// <summary>
/// Callback for EnumWindows
/// </summary>
/// <param name="hWnd">Window handle</param>
/// <param name="lParam">Custom lParam (not used)</param>
/// <returns>true to continue enumerating, false to stop enumerating</returns>
private static bool EnumWindowsProc(IntPtr hWnd, GCHandle lParam)
{
// convert the lParam back into the correct managed object
EnumWindowsParam param = (EnumWindowsParam)lParam.Target;
// apply visible filter (if requested)
if (param.VisibleOnly && ((User32.GetWindowLong(hWnd, GWL.STYLE) & WS.VISIBLE) == 0))
{
return(true);
}
// call the underlying delegate
return(param.EnumDelegate(hWnd, param.CustomParam));
}
/// <summary>
/// Enumerate windows by calling the specified callback proc for each top-level
/// window in the system. If a custom object is specified this object will
/// also be passed to the callback proc (allows the callback proc to modify
/// state, build a list, etc.)
/// </summary>
/// <param name="callbackProc">callback proc</param>
/// <param name="customParam">custom data</param>
public static void EnumerateChildWindows(IntPtr hWndParent, EnumerateChildWindowsDelegate callbackProc, bool visibleOnly, object customParam)
{
// create delegate that will be used for call to native EnumWindows function
// (also create a GC handle to prevent the delegate from being garbage collected
// during the call to EnumWindows!)
EnumWindowsDelegate enumWindowsProc = new EnumWindowsDelegate(EnumWindowsProc);
GCHandle hEnumWindowsProc = GCHandle.Alloc(enumWindowsProc);
// Create the custom parameter that will be passed to EnumWindows and allocate
// a GC handle for it so we can pass it as the LPARAM to the native EnumWindows
EnumWindowsParam param = new EnumWindowsParam(callbackProc, visibleOnly, customParam);
GCHandle hParam = GCHandle.Alloc(param);
try
{
// enumerate windows
User32.EnumChildWindows(hWndParent, enumWindowsProc, hParam);
}
finally
{
// free GC handles used for enumerating windows
hEnumWindowsProc.Free();
hParam.Free();
}
}
