在iOS中上传图片和发布数据时出错

Question

我正在尝试通过邮寄发送图片和一些参数。如果我使用：

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

图像发送正确，但没有字段。

如果我删除图片未发送。

有人可以帮助我吗？

-(int)add:(NSString *)name image:(UIImage *)image email:(NSString *)email dataNasc:(NSString *)dataNasc city:(NSString *)city state:(NSString *)state password:(NSString *)password
{
    NSURL *url = [NSURL URLWithString:@"http://mydomains.com/ws/users/add"];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    NSMutableDictionary *_params = [[NSMutableDictionary alloc]init];
    [_params setObject:email forKey:@"email"];
    [_params setObject:name forKey:@"name"];

    [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
    [request setHTTPShouldHandleCookies:NO];
    [request setTimeoutInterval:30];
    [request setHTTPMethod:@"POST"];

    NSString *boundary = @"0x0hHai1CanHazB0undar135";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request setValue:contentType forHTTPHeaderField:@"Content-Type"];

    NSString *BoundaryConstant = @"----------V2ymHFg03ehbqgZCaKO6jy";
    NSMutableData *body = [NSMutableData data];
    NSData *imageData = UIImageJPEGRepresentation(image, 100);


    for (NSString *param in _params) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"%@\r\n", [_params objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];

    }

        // add image data
    if (imageData) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", @"file"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:imageData];
        [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    }

    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:body];

    NSError *requestError;
    NSURLResponse *urlResponse = nil;
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&requestError];

    NSError *error;
    user = [NSJSONSerialization
            JSONObjectWithData:data
            options:kNilOptions
            error:&error];
    NSLog(@" %d", [[user objectForKey:@"code"]intValue]);
    return [[user objectForKey:@"code"]intValue];
}