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Re: off screen drawing with cocoa

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Re: off screen drawing with cocoa

Subject: Re: off screen drawing with cocoa
From: Warwick Hall <email@hidden>
Date: Tue, 24 Apr 2007 14:45:26 +1000

you have given me some ideas, but now i get an exception thrown. how do i create an offscreen graphics context?

here is my code.

--BEGIN---

#import <Cocoa/Cocoa.h>
#import <WebKit/WebKit.h>

void usage ( prog )
  const char * prog;
{
  fprintf( stderr,
    "Usage: %s <cid> <wid> <rid> <rdate> <file>\n",
    basename( prog ) );
}

NSString * gbUrlEncodeValue ( NSString * iValue )
{
  NSString * theRet = nil;

  theRet = (NSString *)CFURLCreateStringByAddingPercentEscapes(
    kCFAllocatorDefault, (CFStringRef)iValue, NULL,
    CFSTR( "?=&+" ), kCFStringEncodingUTF8 );

  return [theRet autorelease];
}

void gbGenOrder( NSString * iCid, NSString * iWid, NSString * iRid, NSString * iRdate, NSString * iOutput ) { NSString * thePostString = [NSString stringWithFormat : @"pass=%@&cid=%@&wid=%@&rid=%@&date= %@", gbUrlEncodeValue( (NSString *)CFSTR( "ipo79Tsi" ) ), gbUrlEncodeValue( iCid ), gbUrlEncodeValue( iWid ), gbUrlEncodeValue( iRid ), gbUrlEncodeValue( iRdate )];

  NSData * thePostData =
    [thePostString dataUsingEncoding : NSASCIIStringEncoding
                allowLossyConversion : YES];

  NSString * thePostLength =
    [NSString stringWithFormat : @"%d", [thePostData length]];

NSMutableURLRequest * theRequest = [[NSMutableURLRequest alloc] init];

[theRequest setURL : [NSURL URLWithString : @"https://wic023u.server-secure.com/ vs250306_secure/admin/batch/formwrapper.php"]];

  [theRequest setHTTPMethod : @"POST"];
  [theRequest setValue : thePostLength
    forHTTPHeaderField : @"Content-Length"];
  [theRequest setValue : @"application/x-www-form-urlencoded"
    forHTTPHeaderField : @"Content-Type"];

  [theRequest setHTTPBody : thePostData];

  NSURLResponse * theResponse = nil;
  NSError * theError = nil;

  NSData * theHtmlData =
    [NSURLConnection sendSynchronousRequest : theRequest
                          returningResponse : &theResponse
                                      error : &theError];

  if( theError != nil )
  {
    [theRequest release]; theRequest = nil;
    return;
  }

  if( theHtmlData == nil )
  {
    NSLog( @"theHtmlData is nil" );
    [theRequest release]; theRequest = nil;
    return;
  }

  NSString * theHtml =
    [[NSString alloc] initWithBytes : [theHtmlData bytes]
                             length : [theHtmlData length]
                           encoding : NSASCIIStringEncoding];

WebView * webView = [[WebView alloc] initWithFrame : NSMakeRect( 0.0, 0.0, 300.0, 500.0 ) frameName : nil groupName : nil];

  [webView lockFocus];
  [[webView mainFrame] loadHTMLString : theHtml baseURL : nil ];

  NSPrintInfo * printInfo = nil;
  NSPrintInfo * sharedInfo = nil;
  NSPrintOperation * printOp = nil;
  NSMutableDictionary * printInfoDict = nil;
  NSMutableDictionary * sharedDict = nil;

  sharedInfo = [NSPrintInfo sharedPrintInfo];
  sharedDict = [sharedInfo dictionary];

printInfoDict = [NSMutableDictionary dictionaryWithDictionary : sharedDict];

  [printInfoDict setObject : [NSNumber numberWithBool : YES]
                    forKey : NSPrintAllPages];

  [printInfoDict setObject : NSPrintSaveJob
                    forKey : NSPrintJobDisposition];

  [printInfoDict setObject : iOutput
                    forKey : NSPrintSavePath];

  printInfo = [[NSPrintInfo alloc] initWithDictionary : printInfoDict];

  [printInfo setHorizontalPagination : NSAutoPagination];
  [printInfo setVerticalPagination : NSAutoPagination];
  [printInfo setVerticallyCentered : NO];

  NSMutableData * theData = [[NSMutableData alloc] init];
  printOp = [NSPrintOperation EPSOperationWithView : webView
                                        insideRect : [webView bounds]
                                            toData : theData
                                         printInfo : printInfo];

  [printOp setShowPanels : NO];
  [printOp runOperation];

  [printInfo release]; printInfo = nil;
  [theHtml release]; theHtml = nil;

  [theData writeToFile : iOutput atomically : NO];
  [theData release]; theData = nil;

  [webView release]; webView = nil;
  [theRequest release]; theRequest = nil;
}

int main ( argc, argv )
  const int argc;
  const char * const * argv;
{
  if( argc != 6 )
  {
    usage( basename( argv[ 0 ] ) );
    exit( EXIT_FAILURE );
  }

  NSApplicationLoad();

  NSAutoreleasePool * thePool = [[NSAutoreleasePool alloc] init];

  NSGraphicsContext * theGraphicsContext = nil;
  NSMutableDictionary * attributes = nil;

attributes = [NSMutableDictionary dictionary]; [attributes setObject : NSGraphicsContextPSFormat forKey : NSGraphicsContextRepresentationFormatAttributeName];

  theGraphicsContext =
    [NSGraphicsContext graphicsContextWithAttributes : attributes];
NSLog( [theGraphicsContext description] );

gbGenOrder( [NSString stringWithCString : argv[ 1 ]], [NSString stringWithCString : argv[ 2 ]], [NSString stringWithCString : argv[ 3 ]], [NSString stringWithCString : argv[ 4 ]], [[[NSFileManager defaultManager] stringWithFileSystemRepresentation : (const char *)argv[ 5 ] length : (unsigned)strlen( argv[ 5 ] )] stringByExpandingTildeInPath] );

  [thePool release]; thePool = nil;

  exit( EXIT_SUCCESS );
}
--END--

warwick
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References:  
  >off screen drawing with cocoa (From: Warwick Hall <email@hidden>)
  >Re: off screen drawing with cocoa (From: Nick Zitzmann <email@hidden>)




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