c# - How can i get ap rocess window handle intptr and save the process window to image file? -

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i have method drawtobitmap how handle of process window ? example notepad.exe

what want when start program if process(for example notepad.exe) not running yet start once it's running it's window handle , save window image file.

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using elgato.baseclasses.ui; using elgato; using elgato.baseclasses.streaming; using system.diagnostics; using system.runtime.interopservices;   namespace windowsformsapplication1 {     public partial class form1 : form     {           [dllimport("user32.dll")]         private static extern bool printwindow(handleref hwnd, intptr hdcblt, int nflags);          [dllimport("user32.dll", setlasterror = true)]         [return: marshalas(unmanagedtype.bool)]         private static extern bool getwindowrect(intptr hwnd, ref rect lprect);          [structlayout(layoutkind.sequential)]         private struct rect         {             public int left;             public int top;             public int right;             public int bottom;         }           public form1()         {             initializecomponent();            }          private void form1_load(object sender, eventargs e)         {          }          private void button1_click(object sender, eventargs e)         {           }          public static image drawtobitmap(intptr handle)         {             rect rect = new rect();             getwindowrect(handle, ref rect);              bitmap image = new bitmap(rect.right - rect.left, rect.bottom - rect.top);              using (graphics graphics = graphics.fromimage(image))             {                 intptr hdc = graphics.gethdc();                 printwindow(new handleref(graphics, handle), hdc, 0);                 graphics.releasehdc(hdc);             }              return image;         }     } }

to check whether process exists , window handle if exists, use following code: 

    var processes = process.getprocessesbyname("notepad");     if (processes.length > 0)     {         var handle = processes[0].mainwindowhandle;     }     else     {         // notepad not started     }

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