如何用VC实现OSD功能？（一定给分）

[hueofwind]

需要在程序中可以以整个显示器屏幕为对象输出任意字符串，且背景不变，请问
哪里有这方面的资料？谢谢！
一定给分！

[howtotell]

void Transparent::OnShowText(COLORREF m_color)
{

CWnd* pwnd;
pwnd=GetDesktopWindow();

CWindowDC dc(pwnd);


CBrush brush( m_color);
CBrush* OldBrush = dc.SelectObject( &brush );
while( j-- );
j = 3000000;

}

dc.SelectObject( OldBrush );

LOGFONT logFont;
CFont m_font;
ZeroMemory((void*)&logFont,sizeof(logFont));
strcpy(logFont.lfFaceName,"Arial");
logFont.lfHeight = 100;
logFont.lfWeight = 100;
logFont.lfCharSet = GB2312_CHARSET;
logFont.lfOutPrecision = 3;
logFont.lfClipPrecision = 2;
logFont.lfQuality = 1;
logFont.lfPitchAndFamily = 2;
m_font.CreateFontIndirect(&logFont);

dc.SelectObject(&m_font);
dc.SetBkMode(TRANSPARENT);
dc.SetTextColor(m_color);
dc.TextOut(50,50,"Happy BirthDay !");
if(GetSafeHwnd() && dc)
ReleaseDC(&dc);

}

[netsbull]

同意楼上的

[hueofwind]

太谢谢了，但是此时不具备重画机制，如何不让显示的文字被其它应用和鼠标、
键盘操作破坏？