Matt, Laurent,
Thanks for pointing me to this very obvious mistake ! It works perfectly now.
Julien
Le 5 nov. 2010 à 05:23, Laurent Sansonetti a écrit :
> Salut Julien,
>
> Looks like you forgot to set the value of the pointer.
> CGPDFContextCreateWithURL() was therefore called with a pointer to a zero
> rect.
>
> Try this:
>
> page_rectangle = NSMakeRect(0,0,100,100)
> page_rectangle_pointer = Pointer.new_with_type(NSRect.type) # Using
> NSRect.type is better than pasting the whole signature here
> page_rectangle_pointer[0] = page_rectangle
>
> Laurent
>
> On Nov 4, 2010, at 3:12 AM, Julien Jassaud wrote:
>
>> Hello to every one,
>>
>> I am trying to programmatically create a pdf. I have this quite simple code
>> in Cocoa that works perfectly :
>>
>> #import <Cocoa/Cocoa.h>
>> #import <Foundation/Foundation.h>
>>
>> int main (int argc, const char * argv[]) {
>>
>> NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
>>
>> CGContextRef pdfContext;
>> CFStringRef path;
>> CFURLRef url;
>> CGRect pageRect;
>>
>> path = CFStringCreateWithCString(NULL, "./my_pdf.pdf",
>> kCFStringEncodingUTF8);
>> url = CFURLCreateWithFileSystemPath(NULL, path, kCFURLPOSIXPathStyle, 0);
>> CFRelease (path);
>>
>> pageRect = NSMakeRect(0,0,100,100);
>>
>> pdfContext = CGPDFContextCreateWithURL(url, &pageRect, nil);
>> CFRelease(url);
>>
>> CGPDFContextBeginPage(pdfContext, nil);
>>
>> CGContextSetCMYKFillColor(pdfContext, 1.0, 0.0, 0.0, 0.0, 1.0);
>> CGContextFillRect(pdfContext, NSMakeRect(30, 30, 40, 40));
>>
>> CGPDFContextEndPage(pdfContext);
>>
>> CGPDFContextClose(pdfContext);
>>
>> [pool drain];
>> return 0;
>>
>> }
>>
>>
>> After running this program I get a pdf in perfect working order. I tried to
>> port this little example to MacRuby like so :
>>
>> framework 'Cocoa'
>>
>> url = CFURLCreateWithFileSystemPath(nil, './my_pfd.pdf',
>> KCFURLPOSIXPathStyle, 0)
>>
>> page_rectangle = NSMakeRect(0,0,100,100)
>> page_rectangle_pointer =
>> Pointer.new_with_type('{CGRect={CGPoint=dd}{CGSize=dd}}')
>>
>> pdf_context = CGPDFContextCreateWithURL(url, page_rectangle_pointer, nil)
>>
>> CGPDFContextBeginPage(pdf_context, nil)
>>
>> CGContextSetCMYKFillColor(pdf_context, 1.0, 0.0, 0.0, 0.0, 1.0)
>> CGContextFillRect(pdf_context, NSMakeRect(30, 30, 40, 40))
>>
>> CGPDFContextEndPage(pdf_context)
>> CGPDFContextClose(pdf_context)
>>
>> This do produces a pdf but it is completely empty. Also, MacRuby complains
>> when called with the -w option :
>>
>> $ macruby -w cocoapdf.rb
>> unknown: warning: instance variable __octype__ not initialized
>>
>>
>> Does anybody have an idea what I am doing wrong ?
>>
>> Thanks,
>> Julien Jassaud
>>
>> _______________________________________________
>> MacRuby-devel mailing list
>> MacRuby-devel@lists.macosforge.org
>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>
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