从ios上传图像到web服务给出了'Base-64字符数组的无效长度'

本文关键字：Base-64 字符 无效 数组 图像 ios web 服务 | 更新日期: 2023-09-27 18:16:25

我正在尝试从ios应用程序上传图像到web api服务。

我使用[data base64EncodedStringWithOptions]编码图像，然后组合成一个对象与其他一些数据，然后使用NSJSONSerialization，然后将其放在NSMutableURLRequest的主体作为'PUT'，然后使用NSURLSession将其发送到asp.net web api服务。

数据到达web服务并使用JavaScriptSerializer进行反序列化。然后使用Convert。FromBase64String重新创建图像。然而，转换。FromBase64String抛出一个异常' Base-64字符数组的长度无效'。图片大小为38988字节

为了验证这一点，我不发送图像，而是发送一个包含'a'，'b'，'c'， ' '，' ='， 'f'(以及其他各种组合的字符)的数组。这工作得很完美，Convert.FromBase64String不会抛出异常。

是什么导致这个问题的图像数据?

简化Xcode 

  NSString* const Folder = @"SomeFolder";
  NSString *fileName = [self getFileName];
  NSData *data = UIImageJPEGRepresentation(image, 0.0);
  // static char initArray[6] = {'a','b',''0',' ','e','f'};  // if i use this then it works
  // NSData* data = [[NSData alloc] initWithBytes:initArray length:6];
  NSString* sData = [data base64EncodedStringWithOptions:0];
  // set up session
  NSError *error;
  NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
  NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];
  NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"<service url>/api/Documents/PutDoc/%@", id]];
  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
  NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys:Folder, @"folder", fileName, @"fileName", sData, @"sImage", nil];
  NSData *jsonData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
  NSMutableData *postData = (NSMutableData*)[@"=" dataUsingEncoding:NSUTF8StringEncoding];
  [postData appendData:jsonData];
  [request setHTTPBody:postData];
  [request setHTTPMethod:@"PUT"];
  [request addValue:@"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
  [request addValue:@"*/*" forHTTPHeaderField:@"Accept"];
  // send request
  NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    dispatch_async(dispatch_get_main_queue(), ^{
      NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
      if ([httpResponse statusCode] == 200) {
        NSString* msg = [NSString stringWithFormat: @"Document Saved to server"];
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Document Saved" message:msg delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
      } else {
        NSDictionary* dic = [httpResponse allHeaderFields];
        NSString* msg = [NSString stringWithFormat: @"Server Error. Code: %d", [httpResponse statusCode]];
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Document Not Saved" message:msg delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
      }
    });
  }];

web API c#代码(简化)

  JavaScriptSerializer js = new JavaScriptSerializer();
  Document doc = (Document)js.Deserialize<Document>(value);
  byte[] img;
  try {
    img = Convert.FromBase64String(doc.sImage);
  } catch (Exception e) {
    // this is where the 'invalid length' exception is throw
    MyLib.LogIt(string.Format("Error converting: {0}", e.Message));
    throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.InternalServerError) {
      Content = new StringContent("Could not convert image to binary"),
      ReasonPhrase = "Conversion Error"
    });
  }
    ..

从ios上传图像到web服务给出了'Base-64字符数组的无效长度'

我正在发送选定的图像到服务器使用下面的代码，它的工作很好为我。

-(void)ImageUpdatewithImageID
{
imageData = UIImagePNGRepresentation(selectedImage);
NSString *strParameter = [NSString stringWithFormat:@"%@",[self.rmsDbController.globalDict objectForKey:@"BranchID"]];
NSString *strPar = [NSString stringWithFormat:@"http://www.example.com"];
NSURL *url = [NSURL URLWithString:[strPar stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request appendPostData:imageData];
[request setDidFinishSelector:@selector(uploadFinished:)];
[request setDidFailSelector:@selector(uploadFailed:)];
 [request setDelegate:self];
[request startAsynchronous];
}
- (void)uploadFinished:(ASIHTTPRequest *)request
{
        // after image successfully uploaded
}
- (void)uploadFailed:(ASIHTTPRequest *)request
{
        // if image not uploaded
}
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