保存多个 pdf 页面答案

【问题标题】：Save more than one pdf page保存多个 pdf 页面
【发布时间】：2016-09-23 14:45:35
【问题描述】：

我正在从 url 保存一个 pdf 文件，如果我保存一个页面，那么没有问题，但是当我保存整个 pdf 应用程序时崩溃而没有任何日志

我的代码

CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef)url);
NSString *pass = [_JSON objectForKey:@"pass"];
CGPDFDocumentUnlockWithPassword(document, [pass UTF8String]);

int i = (int) CGPDFDocumentGetNumberOfPages(document);
NSLog(@"Number Of pages: %d",i);


//Create the pdf context
for (int j = 0; j<i; j++) {
    page = CGPDFDocumentGetPage(document, j+1); //Pages are numbered starting at 1
    pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
    mutableData = CFDataCreateMutable(NULL, j);
}

//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/user/Desktop/sample.pdf" atomically:YES];

//CleanUP
CGDataConsumerRelease(dataConsumer);
CGPDFDocumentRelease(document);
CFRelease(mutableData);

我认为问题出在循环上，但对这个模块了解不多，我是第一次尝试这个。 Here is the output log which i could never understand and there is no log in console

【问题讨论】：

标签： objective-c pdf

【解决方案1】：

我自己通过摆弄我的代码找到了答案这是我的新工作编码

CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef)url);
NSString *pass = [_JSON objectForKey:@"pass"];
CGPDFDocumentUnlockWithPassword(document, [pass UTF8String]);

int i = (int) CGPDFDocumentGetNumberOfPages(document);
NSLog(@"Number Of pages: %d",i);

//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);


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

    for (int j = 0; j < i; j++) {
    page = CGPDFDocumentGetPage(document, j+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

NSArray *arr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
path = arr[0];
path = [path stringByAppendingPathComponent:@"sample.pdf"];

[(__bridge NSData *)mutableData writeToFile:path atomically:YES];


//CleanUP
CGDataConsumerRelease(dataConsumer);
CGPDFDocumentRelease(document);
CFRelease(mutableData);

我只是在循环整个事情，因为我应该只循环我正在做页面创建部分的部分。

【讨论】：