iPhone开发: Use POST to submit a form

Question

我有以下 html 表单:

<form method="post" action="http://shk.ecomd.de/up.php" enctype="multipart/form-data">
<input type="hidden" name="id" value="12345" />
<input type="file" name="pic" />
<input type="submit" />
</form>

以及以下iPhone SDK提交方法:

- (void)sendfile {
  UIImage *tempImage = [UIImage imageNamed:@"image.jpg"];

  NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
  [request setHTTPMethod:@"POST"];
  [request setURL:[NSURL URLWithString:@"http://url..../form.php"]];


  NSString *boundary = @"------------0xKhTmLbOuNdArY";
  NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
  [request addValue:contentType forHTTPHeaderField: @"Content-Type"];



  NSMutableData *body = [NSMutableData data];
  [body appendData:[[NSString stringWithFormat:@"\r\n%@\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[@"Content-Disposition: form-data; name=\"id\"\r\n\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[@"12345" dataUsingEncoding:NSUTF8StringEncoding]];
  [body appendData:[[NSString stringWithFormat:@"\r\n%@\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]];

  [body appendData:[@"Content-Disposition: form-data; name=\"pic\"; filename=\"photo.png\"\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[NSData dataWithData:UIImageJPEGRepresentation(tempImage, 90)]];

  [body appendData:[[NSString stringWithFormat:@"\r\n%@",boundary] dataUsingEncoding:NSASCIIStringEncoding]];
  // setting the body of the post to the reqeust
  [request setHTTPBody:body];

  NSError *error;
  NSURLResponse *response;
  NSData* result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

  NSString* aStr = [[[NSString alloc] initWithData:result encoding:NSASCIIStringEncoding] autorelease];

  NSLog(@"Result: %@", aStr);

  [request release];    
}

这不起作用，但我不知道为什么。你能帮我么？!!我做错了什么？

Answer 1

您的请求似乎缺少终止边界标记。根据 RFC 2046，多部分 mime 消息的每个部分前面都需要有边界标记。最后一部分需要用最终边界标记来封闭。最终的边界标记后面附加了“--”，表示后面没有任何部分。试试这个代码:

- (void)sendfile {
  UIImage *tempImage = [UIImage imageNamed:@"image.jpg"];

  NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
  [request setHTTPMethod:@"POST"];
  [request setURL:[NSURL URLWithString:@"http://url..../form.php"]];


  NSString *boundary = @"------------0xKhTmLbOuNdArY";
  NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
  [request addValue:contentType forHTTPHeaderField: @"Content-Type"];



  NSMutableData *body = [NSMutableData data];
  [body appendData:[[NSString stringWithFormat:@"\r\n%@\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[@"Content-Disposition: form-data; name=\"id\"\r\n\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[@"12345" dataUsingEncoding:NSUTF8StringEncoding]];
  [body appendData:[[NSString stringWithFormat:@"\r\n%@\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]];

  [body appendData:[@"Content-Disposition: form-data; name=\"pic\"; filename=\"photo.png\"\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
  [body appendData:[NSData dataWithData:UIImageJPEGRepresentation(tempImage, 90)]];

  [body appendData:[[NSString stringWithFormat:@"\r\n%@",boundary] dataUsingEncoding:NSASCIIStringEncoding]];
  // setting the body of the post to the reqeust
  [request setHTTPBody:body];

  //add terminating boundary marker
  [body appendData:[[NSString stringWithFormat:@"\r\n%@--",boundary] dataUsingEncoding:NSASCIIStringEncoding]];

  NSError *error;
  NSURLResponse *response;
  NSData* result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

  NSString* aStr = [[[NSString alloc] initWithData:result encoding:NSASCIIStringEncoding] autorelease];

  NSLog(@"Result: %@", aStr);

  [request release];    
}