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POReading PDF files as string through iPhone application
 

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    <p>I am facing some problem in iPhone application development for "Reading PDF". I have tried following code. I know I have used wrong methods for parsing - parsing methods are just used for searching purpose. But I want to convert entire pdf text in to a string. Say for example Apple's MobileHIG.pdf - I have used in this code.</p> <pre><code>@implementation NetPDFViewController size_t totalPages; // a variable to store total pages // a method to get the pdf ref CGPDFDocumentRef MyGetPDFDocumentRef (const char *filename) { CFStringRef path; CFURLRef url; CGPDFDocumentRef document; path = CFStringCreateWithCString (NULL, filename,kCFStringEncodingUTF8); url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, 0); CFRelease (path); document = CGPDFDocumentCreateWithURL (url);// 2 CFRelease(url); int count = CGPDFDocumentGetNumberOfPages (document);// 3 if (count == 0) { printf("`%s' needs at least one page!", filename); return NULL; } return document; } // table methods to parse pdf static void op_MP (CGPDFScannerRef s, void *info) { const char *name; if (!CGPDFScannerPopName(s, &amp;name)) return; printf("MP /%s\n", name); } static void op_DP (CGPDFScannerRef s, void *info) { const char *name; if (!CGPDFScannerPopName(s, &amp;name)) return; printf("DP /%s\n", name); } static void op_BMC (CGPDFScannerRef s, void *info) { const char *name; if (!CGPDFScannerPopName(s, &amp;name)) return; printf("BMC /%s\n", name); } static void op_BDC (CGPDFScannerRef s, void *info) { const char *name; if (!CGPDFScannerPopName(s, &amp;name)) return; printf("BDC /%s\n", name); } static void op_EMC (CGPDFScannerRef s, void *info) { const char *name; if (!CGPDFScannerPopName(s, &amp;name)) return; printf("EMC /%s\n", name); } // a method to display pdf page. void MyDisplayPDFPage (CGContextRef myContext,size_t pageNumber,const char *filename) { CGPDFDocumentRef document; CGPDFPageRef page; document = MyGetPDFDocumentRef (filename);// 1 totalPages=CGPDFDocumentGetNumberOfPages(document); page = CGPDFDocumentGetPage (document, pageNumber);// 2 CGPDFDictionaryRef d; d = CGPDFPageGetDictionary(page); // ----- edit problem here - CGPDFDictionary is completely unknown // ----- as we don't know keys &amp; values of it. CGPDFScannerRef myScanner; CGPDFOperatorTableRef myTable; myTable = CGPDFOperatorTableCreate(); CGPDFOperatorTableSetCallback (myTable, "MP", &amp;op_MP); CGPDFOperatorTableSetCallback (myTable, "DP", &amp;op_DP); CGPDFOperatorTableSetCallback (myTable, "BMC", &amp;op_BMC); CGPDFOperatorTableSetCallback (myTable, "BDC", &amp;op_BDC); CGPDFOperatorTableSetCallback (myTable, "EMC", &amp;op_EMC); CGPDFContentStreamRef myContentStream = CGPDFContentStreamCreateWithPage (page);// 3 myScanner = CGPDFScannerCreate (myContentStream, myTable, NULL);// 4 CGPDFScannerScan (myScanner);// 5 // CGPDFDictionaryRef d; CGPDFStringRef str; // represents a sequence of bytes d = CGPDFPageGetDictionary(page); if (CGPDFDictionaryGetString(d, "Thumb", &amp;str)){ CFStringRef s; s = CGPDFStringCopyTextString(str); if (s != NULL) { //need something in here in case it cant find anything NSLog(@"%@ testing it", s); } CFRelease(s); // CFDataRef data = CGPDFStreamCopyData (stream, CGPDFDataFormatRaw); } // ----------------------------------- CGContextDrawPDFPage (myContext, page);// 3 CGContextTranslateCTM(myContext, 0, 20); CGContextScaleCTM(myContext, 1.0, -1.0); CGPDFDocumentRelease (document);// 4 } - (void)viewDidLoad { [super viewDidLoad]; // -------------------------------------------------------- // code for simple direct image from pdf docs. UIGraphicsBeginImageContext(CGSizeMake(320, 460)); initialPage=28; MyDisplayPDFPage(UIGraphicsGetCurrentContext(), initialPage, [[[NSBundle mainBundle] pathForResource:@"MobileHIG" ofType:@"pdf"] UTF8String]); imgV.image=UIGraphicsGetImageFromCurrentImageContext(); imgV.image=[imgV.image rotate:UIImageOrientationDownMirrored]; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint LasttouchPoint = [touch locationInView:self.view]; int LasttouchX = LasttouchPoint.x; startpoint=LasttouchX; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint LasttouchPoint = [touch locationInView:self.view]; int LasttouchX = LasttouchPoint.x; endpoint=LasttouchX; if(startpoint&gt;(endpoint+75)){ initialPage++; [self loadPage:initialPage nextOne:YES]; } else if((startpoint+75)&lt;endpoint){ initialPage--; [self loadPage:initialPage nextOne:NO]; } } -(void)loadPage:(NSUInteger)page nextOne:(BOOL)yesOrNo{ if(page&lt;=totalPages &amp;&amp; page&gt;0){ UIGraphicsBeginImageContext(CGSizeMake(720, 720)); MyDisplayPDFPage(UIGraphicsGetCurrentContext(), page, [[[NSBundle mainBundle] pathForResource:@"MobileHIG" ofType:@"pdf"] UTF8String]); CATransition *transition = [CATransition animation]; transition.duration = 0.75; transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; transition.type=kCATransitionPush; if(yesOrNo){ transition.subtype=kCATransitionFromRight; } else { transition.subtype=kCATransitionFromLeft; } transition.delegate = self; [imgV.layer addAnimation:transition forKey:nil]; imgV.image=UIGraphicsGetImageFromCurrentImageContext(); imgV.image=[imgV.image rotate:UIImageOrientationDownMirrored]; } } </code></pre> <p>But I didn't get success to read even a single line from the pdf document. What is still missing?</p>
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    1. USSagar R. Kothari
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    1. COSee this link http://www.iphonedevsdk.com/forum/iphone-sdk-development/29770-pdf-title-keywords-label.html - it has details that read pdf file & extracts string from it. Link has given details of - Extracting the Table of contents
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