Ios 似乎在POST请求之前更改了uiimage编码

我目前正在将UIImage发送到我的服务器以存储在服务器上。因此，我从用户库中获取图像，然后使用Base64对其进行编码，然后将其发送到我的服务器。但是，我发送到服务器的所有图像都不显示。我想知道我使用base64encodedstring发出的post请求是否会改变编码字符串

这就是我所做的

//Upload picture to server
NSData *imageData=UIImageJPEGRepresentation(showPic.image, 1.0f);
NSLog(@"The size of the image is %i",[imageData length]);
[Base64 initialize];
NSString *strEncoded = [Base64 encode:imageData];

//NSLog(@"This is the encoded string to be uploaded %@",encodedPic);
prefs=[NSUserDefaults standardUserDefaults];
userid=[prefs stringForKey:@"userid"];

NSLog(@" %@ is the userid to be used to upload the pic",userid);

NSString *poster = @"username=";
poster = [poster stringByAppendingString:userid];
poster = [poster stringByAppendingString:@"&image="];
poster = [poster stringByAppendingString:strEncoded];



NSString *post = poster;
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:@"http://www.example.com/server/upload"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
[[NSURLConnection alloc] initWithRequest:request delegate:self];

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你能在服务器端收到字符串吗？那么我想你的base64解码在服务器端有问题。你能用一些服务器代码更新你的问题吗？事实上我发现了错误。似乎是使用dataUsingEncoding:NSASCIIStringEncoding从base64字符串中删除所有+符号，从而更改发送到服务器的整个内容。