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
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