How to convert a NSData to pdf in iPhone sdk?

问题

Am converting a webpage as a pdf file. I did the following,

NSString *string=[NSString stringWithFormat:@"%@.pdf",[chapersArray objectAtIndex:pageIndex]];
[controller1 addAttachmentData:pdfData mimeType:@"application/pdf" fileName:string];
[self presentModalViewController:controller1 animated:YES];
[controller1 release];

Now how can i convert my NSData into pdf and save in my application memory? Kindly help me with sample codes or suggestions. Thanks all.

回答1:

Am assuming you have your pdf in documents directory here. You can change it to where ever it actually is. Try this -

//to convert pdf to NSData
NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:@"test.pdf"]; 
NSData *myData = [NSData dataWithContentsOfFile:pdfPath];

Essentially using CGPDFDocumentCreateWithProvider you can convert NSData to pdf,

//to convert NSData to pdf
NSData *data               = //some nsdata
CFDataRef myPDFData        = (CFDataRef)data;
CGDataProviderRef provider = CGDataProviderCreateWithCFData(myPDFData);
CGPDFDocumentRef pdf       = CGPDFDocumentCreateWithProvider(provider);

Don't forget to CFRelease all unused data after you are done.

回答2:

I got this is in a simple method as follows,

-(IBAction)saveasPDF:(id)sender{
     NSString *string=[NSString stringWithFormat:@"%@.pdf",[chapersArray objectAtIndex:pageIndex]];
     [controller1 addAttachmentData:pdfData mimeType:@"application/pdf" fileName:string];
     [self presentModalViewController:controller1 animated:YES];
     [pdfData writeToFile:[self getDBPathPDf:string] atomically:YES];
        }

-(NSString *) getDBPathPDf:(NSString *)PdfName {
   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
   NSString *documentsDir = [paths objectAtIndex:0];
    return [documentsDir stringByAppendingPathComponent:PdfName];
}

回答3:

You can try with this solution:

- (void)saveDataToPDF:(NSData *)pdfDocumentData
{
    //Create the pdf document reference
    CGDataProviderRef dataProvider = CGDataProviderCreateWithCFData((CFDataRef)pdfDocumentData);
    CGPDFDocumentRef document = CGPDFDocumentCreateWithProvider(dataProvider);

    //Create the pdf context
    CGPDFPageRef page = CGPDFDocumentGetPage(document, 1); //Pages are numbered starting at 1
    CGRect pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
    CFMutableDataRef mutableData = CFDataCreateMutable(NULL, 0);

    //NSLog(@"w:%2.2f, h:%2.2f",pageRect.size.width, pageRect.size.height);
    CGDataConsumerRef dataConsumer = CGDataConsumerCreateWithCFData(mutableData);
    CGContextRef pdfContext = CGPDFContextCreate(dataConsumer, &pageRect, NULL);


    if (CGPDFDocumentGetNumberOfPages(document) > 0)
    {
        //Draw the page onto the new context
        //page = CGPDFDocumentGetPage(document, 1); //Pages are numbered starting at 1

        CGPDFContextBeginPage(pdfContext, NULL);
        CGContextDrawPDFPage(pdfContext, page);
        CGPDFContextEndPage(pdfContext);
    }
    else
    {
        NSLog(@"Failed to create the document");
    }

    CGContextRelease(pdfContext); //Release before writing data to disk.

    //Write to disk
    [(__bridge NSData *)mutableData writeToFile:@"/Users/David/Desktop/test.pdf" atomically:YES];

    //Clean up
    CGDataProviderRelease(dataProvider); //Release the data provider
    CGDataConsumerRelease(dataConsumer);
    CGPDFDocumentRelease(document);
    CFRelease(mutableData);
}

来源：https://stackoverflow.com/questions/8005726/how-to-convert-a-nsdata-to-pdf-in-iphone-sdk

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iphone

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pdf

nsdata