我想从现有的pdf文档创建一个新的PDF文件。那就是我有一个pdf文件说“old.pdf”,并且从该用户可以选择一些页面,并从那些选定的页面我想要创建新的pdf文件说“temp1.pdf”。是否可以创建“temp1.pdf”? Plz帮助我,并提供一些代码示例来做到这一点。 感谢。
答案 0 :(得分:0)
这是我的演示代码,你可以尝试一下。但是这段代码有一些问题。新生成的PDF出现乱码文本,我仍无法解决这个问题(有人可以帮忙吗?)。
//old pdf
NSArray* old_PDF_paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* old_PDF_documentsDirectory = [old_PDF_paths objectAtIndex:0];
NSString* old_PDF_ABSOLUTE_PATH = [old_PDF_documentsDirectory stringByAppendingPathComponent:@"old.pdf"];
//new generate pdf
NSArray* output_PDF_paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* output_PDF_documentsDirectory = [output_PDF_paths objectAtIndex:0];
NSString* output_PDF_ABSOLUTE_PATH = [output_PDF_documentsDirectory stringByAppendingPathComponent:@"temp1.pdf"];
NSString* outpath = output_PDF_ABSOLUTE_PATH;
NSURL *url = [[NSURL alloc] initFileURLWithPath:old_PDF_ABSOLUTE_PATH];
CGPDFDocumentRef originalPDF = CGPDFDocumentCreateWithURL((CFURLRef)url);
// query for the number of pages
int ct = CGPDFDocumentGetNumberOfPages(originalPDF);
CGFloat width = 0.0f;
CGFloat height = 0.0f;
CGRect outRect = CGRectMake(0, 0, width, height);
CFURLRef outurl = CFURLCreateWithFileSystemPath (NULL, (CFStringRef)outpath, kCFURLPOSIXPathStyle, 0);
CFMutableDictionaryRef myDictionary = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
// create a context for drawing
CGContextRef context = CGPDFContextCreateWithURL ((CFURLRef)outurl, &outRect, myDictionary); // 5
CFRelease(myDictionary);
for(int i = 1; i <= ct; ++i) {
//page render
CGPDFPageRef pdfPage = CGPDFDocumentGetPage(originalPDF, i);
CGRect pageMediaBox = CGPDFPageGetBoxRect(pdfPage, kCGPDFMediaBox);
CGContextBeginPage (context, &pageMediaBox);
CGContextDrawPDFPage(context, pdfPage);
CGContextEndPage (context);
}
CGContextClosePath(context);
CGContextRelease(context);