C#抓取当前屏幕并保存为图片的方法
程序员文章站
2022-06-14 17:32:04
本文实例讲述了c#抓取当前屏幕并保存为图片的方法。分享给大家供大家参考。具体分析如下:
这是一个c#实现的屏幕抓取程序,可以抓取整个屏幕保存为指定格式的图片,并且保存当前...
本文实例讲述了c#抓取当前屏幕并保存为图片的方法。分享给大家供大家参考。具体分析如下:
这是一个c#实现的屏幕抓取程序,可以抓取整个屏幕保存为指定格式的图片,并且保存当前控制台缓存到文本
using system; using system.collections.generic; using system.componentmodel; using system.diagnostics; using system.drawing; using system.drawing.imaging; using system.io; using system.runtime.interopservices; using system.text; using system.threading; using system.windows.forms; namespace robvanderwoude { class printscreen { static int main( string[] args ) { try { string output = string.empty; bool overwrite = false; bool text = false; imageformat type = null; #region command line parsing if ( args.length == 0 ) { return writeerror( ); } foreach ( string arg in args ) { switch ( arg.toupper( ).substring( 0, 2 ) ) { case "/?": return writeerror( ); case "/o": overwrite = true; break; case "/t": if ( text ) { return writeerror( "cannot capture current window as bitmap" ); } switch ( arg.toupper( ).substring( 3 ) ) { case "bmp": type = imageformat.bmp; break; case "gif": type = imageformat.gif; break; case "jpg": case "jpeg": type = imageformat.jpeg; break; case "png": type = imageformat.png; break; case "tif": case "tiff": type = imageformat.tiff; break; case "txt": text = true; break; default: return writeerror( "invalid file format: \"" + arg.substring( 4 ) + "\"" ); } break; default: output = arg; break; } } // check if directory exists if ( !directory.exists( path.getdirectoryname( output ) ) ) { return writeerror( "invalid path for output file: \"" + output + "\"" ); } // check if file exists, and if so, if it can be overwritten if ( file.exists( output ) ) { if ( overwrite ) { file.delete( output ); } else { return writeerror( "file exists; use /o to overwrite existing files." ); } } if ( type == null && text == false ) { string ext = path.getextension( output ).toupper( ); switch ( ext ) { case ".bmp": type = imageformat.bmp; break; case ".gif": type = imageformat.gif; break; case ".jpg": case ".jpeg": type = imageformat.jpeg; break; case ".png": type = imageformat.png; break; case ".tif": case ".tiff": type = imageformat.tiff; break; case ".txt": text = true; break; default: return writeerror( "invalid file type: \"" + ext + "\"" ); return 1; } } #endregion command line parsing if ( text ) { string readtext = string.empty; for ( short i = 0; i < (short) console.bufferheight; i++ ) { foreach ( string line in consolereader.readfrombuffer( 0, i, (short) console.bufferwidth, 1 ) ) { readtext += line + "\n"; } } streamwriter file = new streamwriter( output ); file.write( readtext ); file.close( ); } else { int width = screen.primaryscreen.bounds.width; int height = screen.primaryscreen.bounds.height; int top = 0; int left = 0; bitmap printscreen = new bitmap( width, height ); graphics graphics = graphics.fromimage( printscreen as image ); graphics.copyfromscreen( top, left, 0, 0, printscreen.size ); printscreen.save( output, type ); } return 0; } catch ( exception e ) { console.error.writeline( e.message ); return 1; } } #region error handling public static int writeerror( string errormessage = "" ) { console.resetcolor( ); if ( string.isnullorempty( errormessage ) == false ) { console.error.writeline( ); console.foregroundcolor = consolecolor.red; console.error.write( "error: " ); console.foregroundcolor = consolecolor.white; console.error.writeline( errormessage ); console.resetcolor( ); } console.error.writeline( ); console.error.writeline( "printscreen, version 1.10" ); console.error.writeline( "save a screenshot as image or save the current console buffer as text" ); console.error.writeline( ); console.error.write( "usage: " ); console.foregroundcolor = consolecolor.white; console.error.writeline( "printscreen outputfile [ /t:type ] [ /o ]" ); console.resetcolor( ); console.error.writeline( ); console.error.write( "where: " ); console.foregroundcolor = consolecolor.white; console.error.write( "outputfile" ); console.resetcolor( ); console.error.writeline( " is the file to save the screenshot or text to" ); console.foregroundcolor = consolecolor.white; console.error.write( " /t:type" ); console.resetcolor( ); console.error.write( " specifies the file type: " ); console.foregroundcolor = consolecolor.white; console.error.write( "bmp" ); console.resetcolor( ); console.error.write( ", " ); console.foregroundcolor = consolecolor.white; console.error.write( "gif" ); console.resetcolor( ); console.error.write( ", " ); console.foregroundcolor = consolecolor.white; console.error.write( "jpg" ); console.resetcolor( ); console.error.write( ", " ); console.foregroundcolor = consolecolor.white; console.error.write( "png" ); console.resetcolor( ); console.error.write( ", " ); console.foregroundcolor = consolecolor.white; console.error.write( "tif" ); console.resetcolor( ); console.error.write( " or " ); console.foregroundcolor = consolecolor.white; console.error.writeline( "txt" ); console.resetcolor( ); console.error.write( " (only required if " ); console.foregroundcolor = consolecolor.white; console.error.write( "outputfile" ); console.resetcolor( ); console.error.writeline( " extension is different)" ); console.foregroundcolor = consolecolor.white; console.error.write( " /o" ); console.resetcolor( ); console.error.writeline( " overwrites an existing file" ); console.error.writeline( ); console.error.write( "credits: code to read console buffer by simon mourier " ); console.foregroundcolor = consolecolor.darkgray; console.error.writeline( "http://www.sina.com.cn" ); console.resetcolor( ); console.error.write( " code for graphic screenshot by ali hamdar " ); console.foregroundcolor = consolecolor.darkgray; console.error.writeline( "//www.jb51.net" ); console.resetcolor( ); console.error.writeline( ); console.error.writeline( "written by rob van der woude" ); console.error.writeline( "http://www.qq.com" ); return 1; } #endregion error handling } #region read from console buffer public class consolereader { public static ienumerable<string> readfrombuffer( short x, short y, short width, short height ) { intptr buffer = marshal.allochglobal( width * height * marshal.sizeof( typeof( char_info ) ) ); if ( buffer == null ) throw new outofmemoryexception( ); try { coord coord = new coord( ); small_rect rc = new small_rect( ); rc.left = x; rc.top = y; rc.right = (short) ( x + width - 1 ); rc.bottom = (short) ( y + height - 1 ); coord size = new coord( ); size.x = width; size.y = height; const int std_output_handle = -11; if ( !readconsoleoutput( getstdhandle( std_output_handle ), buffer, size, coord, ref rc ) ) { // 'not enough storage is available to process this command' may be raised for buffer size > 64k (see readconsoleoutput doc.) throw new win32exception( marshal.getlastwin32error( ) ); } intptr ptr = buffer; for ( int h = 0; h < height; h++ ) { stringbuilder sb = new stringbuilder( ); for ( int w = 0; w < width; w++ ) { char_info ci = (char_info) marshal.ptrtostructure( ptr, typeof( char_info ) ); char[] chars = console.outputencoding.getchars( ci.chardata ); sb.append( chars[0] ); ptr += marshal.sizeof( typeof( char_info ) ); } yield return sb.tostring( ); } } finally { marshal.freehglobal( buffer ); } } [structlayout( layoutkind.sequential )] private struct char_info { [marshalas( unmanagedtype.byvalarray, sizeconst = 2 )] public byte[] chardata; public short attributes; } [structlayout( layoutkind.sequential )] private struct coord { public short x; public short y; } [structlayout( layoutkind.sequential )] private struct small_rect { public short left; public short top; public short right; public short bottom; } [structlayout( layoutkind.sequential )] private struct console_screen_buffer_info { public coord dwsize; public coord dwcursorposition; public short wattributes; public small_rect srwindow; public coord dwmaximumwindowsize; } [dllimport( "kernel32.dll", setlasterror = true )] private static extern bool readconsoleoutput( intptr hconsoleoutput, intptr lpbuffer, coord dwbuffersize, coord dwbuffercoord, ref small_rect lpreadregion ); [dllimport( "kernel32.dll", setlasterror = true )] private static extern intptr getstdhandle( int nstdhandle ); } #endregion read from console buffer }
希望本文所述对大家的c#程序设计有所帮助。
下一篇: 如何做肉汤,肉汤有什么营养价值