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我已经准备好从表单接收数据的服务器端 php 代码，我已经对其进行了测试。现在我正在尝试将图像添加到应用程序。这意味着用户不仅会在注册时输入他的姓名和密码以及电子邮件，还会选择要上传的图像。到目前为止我有这个：  

Create a urlString with the string data to send.
Prepare an image
Prepare the post string
Create URLRequest and set its parameters
Add a boundary
Prepare Image to Post
Receive Server Response

 
-(NSDictionary*)addUser:(NSString *)usuario withPass:(NSString *)clave withAddress:(NSString*)direccion withImage:(UIImage*)imagen{

    //1.CREATE URL TO SEND
    NSString *urlString = [NSString stringWithFormat:@"username=%@&password=%@&email=%@",usuario,clave,direccion];

    NSLog(@"user registration string:%@",urlString);

    //2.PREPARE IMAGE
    NSData *imageData = UIImageJPEGRepresentation(imagen, 90);

    //3.POST THE STRING
    NSData *postData = [urlString dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

    //4.CREATE URLREQUEST WITH STRING TO POST TO
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://www.santiapps.com/learnable/login2/user_add_save.php"]];
    [request setURL:url];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];

    //5.ADD BOUNDARY
    NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    //6.PREPARE IMAGE POST DATA
    NSString *name1= [NSString stringWithFormat:@"imagefor%@",usuario];
    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"images\"; filename=\"%@\"\r\n",name1] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    //7.PREPARE TO RECEIVE RESPONSE
    NSURLResponse *response = nil;
    NSError *error = nil;
    // Later add code to parse returned data
    NSData *myData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSString *returnString = [[NSString alloc] initWithData:myData encoding:NSUTF8StringEncoding];
    NSLog(@"server string %@",returnString);
    NSError *outError = NULL;
    NSDictionary *tempDict = [NSDictionary dictionaryWithJSONData:myData error:&outError];
    NSLog(@"Dict of errors:%@",tempDict);
    return tempDict;

}
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