pdf protegido contraseña en Objective-C

Question

me trató de usar la información dada aquí

https://developer.apple.com/library/mac/#documentation/graphicsimaging/conceptual/drawingwithquartz2d/dq_pdf/dq_pdf.html#//apple_ref/doc/uid/TP30001066-CH214-TPXREF101

pero es muy vaga ...

También he intentado usar este código usando UIKit ... se crea el archivo .. pero es de 0 kb .. no se puede escribir cualquier dato ..

BOOL allowCopy=YES; 
BOOL allowPrint=YES; 
//NSString *password=@"test"; 

CGContextRef pdfContext; //our pdfContext 

CFStringRef path; 

CFURLRef url; 

CGRect pageRect = CGRectMake(0, 0,500, 500); 

NSString *fileName=@"Test.pdf"; 
// CFStringRef passwordString = (__bridge_retained CFStringRef)password; 

const char *filename = [fileName UTF8String]; 

// Create a CFString from the filename we provide to this method when we call it 
path = CFStringCreateWithCString (NULL, filename, kCFStringEncodingUTF8); 

// Create a CFURL using the CFString we just defined 
url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, 0); 

CFMutableDictionaryRef myDictionary = NULL; 
// This dictionary contains extra options mostly for 'signing' the PDF 

myDictionary = CFDictionaryCreateMutable(NULL, 0, 
             &kCFTypeDictionaryKeyCallBacks, 
             &kCFTypeDictionaryValueCallBacks); 

CFDictionarySetValue(myDictionary, kCGPDFContextOwnerPassword, CFSTR("user")); 
CFDictionarySetValue(myDictionary, kCGPDFContextUserPassword, CFSTR("user")); 

if (!allowCopy) 
    CFDictionarySetValue(myDictionary, kCGPDFContextAllowsCopying, kCFBooleanFalse);  
//kCGPDFContextAllowsCopying is set to TRUE by default 

if (!allowPrint) 
    CFDictionarySetValue(myDictionary, kCGPDFContextAllowsPrinting, kCFBooleanFalse);  
//kCGPDFContextAllowsPrinting is set to TRUE by default 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder 
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:fileName]; 

if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath]) 
    [[NSFileManager defaultManager] createFileAtPath:dataPath contents:nil attributes:nil]; 
// CGRect papersize= CGRectMake(0, 0, 400, 400); 

pdfContext = CGPDFContextCreateWithURL (url, &pageRect, myDictionary); 

// Cleanup our mess 
CFRelease(myDictionary); 

CFRelease(url); 

//Now, this is a tricky part. We make use of a do - while loop in order to create as many pages as needed 

CGContextBeginPage (pdfContext, &pageRect); //begins a new PDF page 

//create layout for our page 

CGRect bounds = CGRectMake(0, 0,500,500); 

UIGraphicsPushContext(pdfContext); //pushing the context, as explained at the beginning of this post 

CGContextSaveGState(pdfContext); 

CGContextTranslateCTM(pdfContext, 0, bounds.origin.y); 

CGContextScaleCTM(pdfContext, 1, -1); 

CGContextTranslateCTM(pdfContext, 0, -(bounds.origin.y + bounds.size.height)); 

//[@"HELLO" drawInRect:CGRectMake(10,15,10,30) withFont:[UIFont fontWithName:@"Helvetica-Bold" size:40]]; 

//THIS IS THE NASTY PART 
CGContextRestoreGState(pdfContext); 

UIGraphicsPopContext(); 

CGContextEndPage (pdfContext); //ends the current page 

// We are done with our context now, so we release it 

CGContextRelease (pdfContext); 

CFRelease(path); 

// Create our PDF Context with the CFURL, the CGRect we provide, and the above defined dictionary 

si alguien puede ayudar .. gracias ..

Answer 1

Modificar la lista de 13-4 y añadir las siguientes líneas que se colocan entre los comentarios:

CFDictionarySetValue(myDictionary, kCGPDFContextTitle, CFSTR("My PDF File")); 
CFDictionarySetValue(myDictionary, kCGPDFContextCreator, CFSTR("My Name")); 
/// 
CFDictionarySetValue(myDictionary, kCGPDFContextUserPassword, CFSTR("userpassword")); 
CFDictionarySetValue(myDictionary, kCGPDFContextOwnerPassword, CFSTR("ownerpassword")); 
/// 
pdfContext = CGPDFContextCreateWithURL (url, &pageRect, myDictionary); 

Las opciones de seguridad compatibles se enumeran al final del artículo.

Answer 2

CFMutableDataRef theData = 0; 
theData =CFDataCreateMutable(NULL, 0); 


const CGRect mediaRect = CGRectMake(0.0f, 0.0f, 100, 100); 


CGContextRef cgContext = 0; 
CGDataConsumerRef theConsumer =CGDataConsumerCreateWithCFData(theData); 
if(theConsumer != 0) 
{ 
    CFMutableDictionaryRef auxiliaryInfo = CFDictionaryCreateMutable(NULL,0,NULL,NULL); 
    CFDictionarySetValue(auxiliaryInfo, kCGPDFContextUserPassword, CFSTR("password")); 
    CFDictionarySetValue(auxiliaryInfo, kCGPDFContextOwnerPassword, CFSTR("password1")); 
    cgContext = CGPDFContextCreate(theConsumer, &mediaRect, (CFDictionaryRef)auxiliaryInfo); 
    CGDataConsumerRelease(theConsumer); 
    CFRelease(auxiliaryInfo); 
} 


if(cgContext != 0) 
{ 
    CGContextBeginPage(cgContext, &mediaRect); 
    CGContextSaveGState(cgContext); 


    CGContextEndPage(cgContext); 
    CGContextRestoreGState(cgContext); 
    CGContextFlush(cgContext); 

    CGContextRelease(cgContext); 
} 

NSString* outputPath = [@"path/test" stringByAppendingPathExtension:@"pdf"]; 

[(NSData*)theData writeToFile:outputPath atomically:YES];