将byte []转换为NSData后数据损坏 [英] Data corrupt after converting byte[] to NSData

问题描述

我的.Net Web服务响应包含byte []条目，以及其他字段。
数据是PDF文件。

I have .Net web service response containing a byte[] entry, among other fields. The data is a PDF file.

我从收到的数据中提取字典：
[NSJSONSerialization JSONObjectWithData]

I extract the Dictionary from the received data with: [NSJSONSerialization JSONObjectWithData]

此后我使用以下代码将byte []转换为NSData。
然后我将结果保存到磁盘（参见最后一行）。

Hereafter I use the following code to convert the byte[] to NSData. I then save the result to disk (see last line).

打开生成的PDF文件时，出现以下错误：

When opening the resulting PDF file, I get the following error:

找不到PDF标题：找不到'％PDF'。

        NSArray *byteArray = [rootDictionary objectForKey:@"file"];

        unsigned c = byteArray.count;
        uint8_t *bytes = malloc(sizeof(*bytes) * c);

        unsigned i;
        for (i = 0; i < c; i++)
        {
            NSString *str = [byteArray objectAtIndex:i];
            int byte = [str intValue];
            bytes[i] = (uint8_t)byte;
        }

        NSData* data = [NSData dataWithBytes:(const void *)byteArray length:sizeof(unsigned char)*c];

        //Save to disk using svc class.
        NSString *localPath = [svc saveReport:data ToFile:[rootDictionary objectForKey:@"name"]];

我也尝试将byte []转换为base64 NSString（在服务端）然后返回在我的应用程序中的NSData，它工作（**大多数）但我被告知它是邋code的代码。

I also tried converting the byte[] to a base64 NSString (on the service side) and then back to NSData in my app, which worked (**mostly) but I was told that it's sloppy code.

**当同时异步拉出多个PDF时，有些收到的这些报告作为base64字符串也已损坏。

** When pulling multiple PDF asynchronously at the same time, some of these reports received as base64 strings were also corrupted.

PS。如果我必须提供我的svc课程的代码，请告诉我，但我认为问题不存在。

PS. Please let me know if I must supply the code from my svc class as well, but I don't think the problem is there.

编辑：
我创建了一个新的Web服务方法，它接受一个byte []作为输入，然后修改我的iOS应用程序将byteArray变量发送回服务，然后将其保存到文件中。
生成的PDF文件是Adobe可读的有效文件。意思是转移期间没有腐败。

I created a new web service method which takes a byte[] as input, then modified my iOS app to send the byteArray variable back to the service, where it get's saved to a file. The resulting PDF file is a valid file readable by Adobe. Meaning there is no corruption during transfer.

谢谢！

推荐答案

好的，最后在对我的代码进行精细梳理后对其进行了整理（受到来自 http://www.raywenderlich.com/forums/viewtopic.php?f=2&p=38590#p38590 ）。

O.k, finally sorted this out after fine-tooth-combing my code (as inspired by snadeep.gvn from http://www.raywenderlich.com/forums/viewtopic.php?f=2&p=38590#p38590).

我犯了一个愚蠢的错误，我忽略了100多次。

I made a stupid mistake, which I overlooked 100+ times.

这行代码：

NSData* data = [NSData dataWithBytes:(const void *)byteArray length:sizeof(unsigned char)*c];

应更改为：

NSData* data = [NSData dataWithBytes:(const void *)bytes length:sizeof(unsigned char)*c];

好时光，现在我终于可以睡一觉了： - ）

Good times, now I can finally get some sleep :-)

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