Tag Archive for 'Button'

Enumerating Child Windows in Silverlight

Published on June 19, 2011 in Computer Science. 0 Comments Tags: , , , .

Today I’d like to give you a short example how to enumerate all child windows in a Silverlight application:

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void EnumChildWindows(Visual visualParent)
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(visualParent); i++)
    {
        Visual visual = (Visual)VisualTreeHelper.GetChild(visualParent, i);
        EnumChildWindows(visual);
 
        if (visual is Button)
        {
            // do something
        }
    }
}

In the code snippet above, the child windows are collected recursively. Since EnumChildWindows accepts a visualParent of Type Visual, one can start using the MainWindow object, e.g. obtained via reflection. This technique even finds child windows (buttons, text boxes, etc.) not defined in a XAML file.

HowTo Rename Windows’ Start Button

Published on June 13, 2009 in Computer Science. 0 Comments Tags: , , .

First of all, the following HowTo article doesn’t make sense. Justus and I just found out how you can rename the Start Button of Windows (XP, 2000 etc.). :-)

(1) In the main function determine the handle of the Desktop Windows (see GetDesktopWindow). (2) Then enumerate all Child Windows of the Desktop (see EnumChildWindows) ’til you find the Start Button (by comparing the buttons Class and Name). (3) If you found the Start Button, just pass its handle to the well-known SetWindowText function. That’s it!

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int _tmain(int argc, _TCHAR* argv[])
{
	HWND lhStartButton = NULL;
 
	// get desktop window and enum child windows
	HWND lhDesktopWindow = GetDesktopWindow();
	EnumChildWindows(lhDesktopWindow, EnumChildProc, (LPARAM)&lhStartButton);
 
	// set the start button's text
	SetWindowText(lhStartButton, TEXT("Stop"));
 
	return 0;
}
 
BOOL CALLBACK EnumChildProc(HWND hwnd, LPARAM lParam)
{
	int liLength = 255;
	BOOL lbResult = TRUE;
 
	TCHAR *lpszClass = new TCHAR[liLength + 1];
	TCHAR *lpszText = new TCHAR[liLength + 1];
 
	// get window class name and text
	GetClassName(hwnd, lpszClass, liLength);
	GetWindowText(hwnd, lpszText, liLength);
 
	// compare class name and text
	if ( 0 == wcscmp(TEXT("Button"), lpszClass) &&
             0 == wcscmp(TEXT("Start"), lpszText) )
	{
		lbResult = FALSE;
		(*(HWND*)lParam) = hwnd;
	}
 
	delete[] lpszClass;
	delete[] lpszText;
 
	return lbResult;
}

Anyways. Why not blogging senseless things? ;-)