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.NET Forum / Windows Forms / Drawing / April 2005How to get Screen Graphics
hi all, I want to be able to draw on the screen.Earlier We could do so by obtaining HDC of the screen as GetDC(0) and the drawing on it. Is there any alternative for it in .NET. Please give me some pointer on the same. thanks sanjay You need a little bit of interop. Use DLLImport to define the GetDC and ReleaseDC methods from User32.DLL then get the DC for the desktop using a null window handle. Create a Graphics object using Graphics.FromHdc, draw on the desktop, dispose of the Graphics and then release the DC.  SignatureBob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. > hi all, > I want to be able to draw on the screen.Earlier We could do so by [quoted text clipped - 7 lines] > > sanjay hi, thanks a lot Bob. But I also need to Set Current ForegroundMix Mode like it was done with "SetROP2" Is that possible with Graphics Object of .Net ? thanks sanjay > You need a little bit of interop. > [quoted text clipped - 14 lines] > > > > sanjay Nope, that doesn't exist anymore. SignatureBob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. > hi, > thanks a lot Bob. [quoted text clipped - 26 lines] >> > >> > sanjay Just to clarify that statement; If you want to use ROPs you have to use GDI through interop exclusively. There are no equivalents for XOR etc in GDI+ Alpha blending is the way to go. SignatureBob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. > hi, > thanks a lot Bob. [quoted text clipped - 26 lines] >> > >> > sanjay Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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