[MacRuby-devel] Creating a pdf : Cocoa to MacRuby translation

[Matt Aimonetti]

Avec plaisir, feel free to share the result of your work once you're done :)

- Matt

On Thu, Nov 4, 2010 at 7:19 PM, Julien Jassaud <sojastar07 at gmail.com> wrote:

> 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
>
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