Multipart/Formdata图像上传，获取文件

问题描述：

在我的应用程序我想上传一个图像选择通过UIImagePickerController到一个数据库，只接受JPEG图像。我在这里浏览了很多问题，在其他论坛上，但我仍然没有得到它的工作。我希望你能检查我的代码，如果有一个我看不到的错误。这是要上传的完整方法，与图像的说明中，图像标题，以及用于该图像的地理数据：Multipart/Formdata图像上传，获取文件

- (void) uploadPic{ 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *destinationFilePath = [[NSString alloc] initWithFormat: @"%@/%@.jpeg", documentsDirectory, self.chosenImage.imgTitle]; 
    NSURL *fileURL = [[NSURL alloc]initWithString:destinationFilePath]; 
    NSLog(@"will upload file: %@", destinationFilePath); 

    NSData *imageURLdata = [[NSData alloc]initWithContentsOfURL:fileURL]; (*1) 
    NSData *imageData = UIImageJPEGRepresentation(self.chosenImage, 90); (*2) 
    //Here i tried 2 ways of getting the data for uploading, but both don't work. 

    // create the URL 
    NSURL *postURL = [NSURL URLWithString:@"http://*********/PictureUpload"]; 

    // create the connection 
    NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:postURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0]; 

    // change type to POST (default is GET) 
    [postRequest setHTTPMethod:@"POST"]; 

    // just some random text that will never occur in the body 
    NSString *stringBoundary = @"0xKhTmLbOuNdArY---This_Is_ThE_BoUnDaRyy---pqo"; 

    // header value, user session ID added 
    NSString *headerBoundary = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", 
           sessionID]; 

    // set header 
    [postRequest addValue:headerBoundary forHTTPHeaderField:@"Content-Type"]; 
    // create data 
    NSMutableData *postBody = [NSMutableData data]; 

    // title part 
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"title\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[self.chosenImage.imgTitle dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 

    // desc part 
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"desc\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[self.chosenImage.imgDescription dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 


    // latitude part 
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"latitude\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[self.chosenImage.latitude dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 

    // longitude part 
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"longitude\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[self.chosenImage.longitude dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 

    // media part 
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"%@.jpeg\"\r\n", self.chosenImage.imgTitle ] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[@"Content-Type: image/jpeg\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[NSData dataWithData:imageURLdata]]; 
    [postBody appendData:[@"Content-Transfer-Encoding: binary\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 

    // final boundary 
    [postBody appendData:[[NSString stringWithFormat:@"--%@--\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    NSString *s = [[NSString alloc] initWithData:postBody encoding:NSASCIIStringEncoding]; 
    NSLog(@"%@", s); 

    // add body to post 
    [postRequest setHTTPBody:postBody]; 

    // pointers to some necessary objects 
    NSURLResponse* response; 
    NSError* error; 

    // synchronous filling of data from HTTP POST response 
    NSData *responseData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error]; 

    if (error) 
    { 
     NSLog(@"Error: %@", [error localizedDescription]); 
    } 

    // convert data into string 
    NSString *responseString = [[NSString alloc] initWithBytes:[responseData bytes] 
                 length:[responseData length] 
                 encoding:NSUTF8StringEncoding]; 

    // see if we get a welcome result 
    NSLog(@"%@", responseString); 
    [self responseHandler:responseString]; 

}

的GEOimagechosenImage经由CGImageRef创建UIImage后选择在ImagePickerController。方法编号： * 1得到上传的NSData并不是最好的，因为这里的图像是从文档目录中选择的，这里每个EXIF信息都会被删除。使用这两种方法我从数据库得到的响应不支持图像文件类型（JPEG预期）。我认为与方法nr。 * 2我发送一个JPEG图像，但也许我在整个multipart/formdata过程中出现错误。

我试图让URL到文件系统上的原始文件，但这对我来说很困难。我只从图像中获取资产-URL。

在此先感谢

S4lfish

答

你可能已经解决了它在自己的现在，但我想我看到你的问题。

NSString *stringBoundary = @"0xKhTmLbOuNdArY---This_Is_ThE_BoUnDaRyy---pqo"; 

// header value, user session ID added 
NSString *headerBoundary = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", 
          sessionID];

当您在MIME头部中定义边界时，您将使用sessionID作为边界。然后，在下面，使用stringBoundary变量创建实际边界。

[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];

它也可能是一个好主意，为每个MIME块来帮助处理代码的内容长度，但我不认为这是有问题。

答

//试试这个---- >>>

NSMutableDictionary *post_dic=[[NSMutableDictionary 
    alloc]initWithCapacity:20]; [post_dic setObject:firstName_txtFld.text 
    forKey:@"firstname"]; [post_dic setObject:lastName_txtFld.text 
    forKey:@"lastname"]; [post_dic setObject:email_txtFld.text 
    forKey:@"email"]; [post_dic setObject:password_txtFld.text 
    forKey:@"password"]; [post_dic setObject:country_txtFld.text 
    forKey:@"address"]; [post_dic setObject:state_txtFld.text 
    forKey:@"state"]; [post_dic setObject:city_txtFld.text 
    forKey:@"city"]; [post_dic setObject:zip_txtFld.text forKey:@"zip"]; 
    [post_dic setObject:phoneNumber_txtFld.text forKey:@"phonenumber"]; 
    NSURL *url = [NSURL URLWithString:@"Enter your url"]; 
    NSMutableURLRequest *urlRequest = [NSMutableURLRequest 
    requestWithURL:url]; [urlRequest setHTTPMethod:@"POST"]; [urlRequest 
    setHTTPBody:[urlString dataUsingEncoding:NSUTF8StringEncoding]]; 
      NSString *boundary = @"--------------------------14737809831466499882746641449"; NSString 
    *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary]; 
    [urlRequest addValue:contentType 
    forHTTPHeaderField: @"Content-Type"]; 
      NSMutableData *postbody = [NSMutableData data]; 
      for (NSString *param in post_dic) { 
     [postbody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; 
    name=\"%@\"\r\n\r\n", param] 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postbody appendData:[[NSString stringWithFormat:@"%@\r\n", [post_dic objectForKey:param]] 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
      } 
     [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; 
    name=\"filedata\"; 
    filename=\"%@.jpg\"\r\n",@"text"] 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
     [postbody appendData:[@"Content-Type: application/octet-stream\r\n\r\n" 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
     //NSLog(@" image -->%@",imageData); 
     [postbody appendData:[NSData dataWithData:imageData]]; 
     [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] 
    dataUsingEncoding:NSUTF8StringEncoding]]; 
     [urlRequest setHTTPBody:postbody]; [urlRequest setURL:url]; 
     NSURLConnection *connection=[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self]; 
[connection start];

Multipart/Formdata图像上传，获取文件

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