如何使用Objective-C POST多部分/表单数据?

内容来源于 Stack Overflow,并遵循CC BY-SA 3.0许可协议进行翻译与使用

  • 回答 (2)
  • 关注 (0)
  • 查看 (46)

所以这个HTML代码为我提供正确格式的数据。

<form action="https://www.example.com/register.php" method="post" enctype="multipart/form-data">
    Name: <input type="text" name="userName"><BR />
    Email: <input type="text" name="userEmail"><BR />
    Password: <input type="text" name="userPassword"><BR />
    Avatar: <input type="file" name="avatar"><BR />
    <input type="submit">
</form>

我已经研究了很多关于如何在iOS上执行多部分/表单数据POST的文章,但没有一篇真正解释如果有正常参数以及文件上传时该怎么做。

你能帮我用Obj-C发布这个代码吗?

提问于
用户回答回答于

过程如下:

  1. 创建字典的userNameuserEmailuserPassword参数。 NSDictionary *params = @{@"userName" : @"rob", @"userEmail" : @"rob@email.com", @"userPassword" : @"password"};
  2. 确定图像的路径: NSString *path = [[NSBundle mainBundle] pathForResource:@"avatar" ofType:@"png"];
  3. 创建请求: NSString *boundary = [self generateBoundaryString]; // configure the request NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url]; [request setHTTPMethod:@"POST"]; // set content type NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary]; [request setValue:contentType forHTTPHeaderField: @"Content-Type"]; // create body NSData *httpBody = [self createBodyWithBoundary:boundary parameters:params paths:@[path] fieldName:fieldName];
  4. 这是上面用于构建请求主体的方法: - (NSData *)createBodyWithBoundary:(NSString *)boundary parameters:(NSDictionary *)parameters paths:(NSArray *)paths fieldName:(NSString *)fieldName { NSMutableData *httpBody = [NSMutableData data]; // add params (all params are strings) [parameters enumerateKeysAndObjectsUsingBlock:^(NSString *parameterKey, NSString *parameterValue, BOOL *stop) { [httpBody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [httpBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", parameterKey] dataUsingEncoding:NSUTF8StringEncoding]]; [httpBody appendData:[[NSString stringWithFormat:@"%@\r\n", parameterValue] dataUsingEncoding:NSUTF8StringEncoding]]; }]; // add image data for (NSString *path in paths) { NSString *filename = [path lastPathComponent]; NSData *data = [NSData dataWithContentsOfFile:path]; NSString *mimetype = [self mimeTypeForPath:path]; [httpBody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [httpBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", fieldName, filename] dataUsingEncoding:NSUTF8StringEncoding]]; [httpBody appendData:[[NSString stringWithFormat:@"Content-Type: %@\r\n\r\n", mimetype] dataUsingEncoding:NSUTF8StringEncoding]]; [httpBody appendData:data]; [httpBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; } [httpBody appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; return httpBody; }
  5. 以上使用了以下实用方法: @import MobileCoreServices; // only needed in iOS - (NSString *)mimeTypeForPath:(NSString *)path { // get a mime type for an extension using MobileCoreServices.framework CFStringRef extension = (__bridge CFStringRef)[path pathExtension]; CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, extension, NULL); assert(UTI != NULL); NSString *mimetype = CFBridgingRelease(UTTypeCopyPreferredTagWithClass(UTI, kUTTagClassMIMEType)); assert(mimetype != NULL); CFRelease(UTI); return mimetype; } - (NSString *)generateBoundaryString { return [NSString stringWithFormat:@"Boundary-%@", [[NSUUID UUID] UUIDString]]; }
  6. 然后提交请求。这里有很多很多的选择。 例如,如果使用NSURLSession,您可以创建NSURLSessionUploadTaskNSURLSession *session = [NSURLSession sharedSession]; // use sharedSession or create your own NSURLSessionTask *task = [session uploadTaskWithRequest:request fromData:httpBody completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if (error) { NSLog(@"error = %@", error); return; } NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"result = %@", result); }]; [task resume]; 或者你可以创建一个NSURLSessionDataTaskrequest.HTTPBody = httpBody; NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if (error) { NSLog(@"error = %@", error); return; } NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"result = %@", result); }]; [task resume]; 上面假设服务器只是返回文本响应。如果服务器返回JSON会更好,在这种情况下,您会使用NSJSONSerialization而不是NSString方法initWithData。 同样,我正在使用上面的完成块再现NSURLSession,但也可以使用更丰富的基于委托的再现。但这似乎超出了这个问题的范围,所以我会把它留给你。

但希望这可以说明这个想法。

如果我没有指出这一点,我会失去工作,比上述更容易,你可以使用AFNetworking,重复上面的步骤1和2,但只需调用:

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer]; // only needed if the server is not returning JSON; if web service returns JSON, remove this line
NSURLSessionTask *task = [manager POST:urlString parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    NSError *error;
    if (![formData appendPartWithFileURL:[NSURL fileURLWithPath:path] name:@"avatar" fileName:[path lastPathComponent] mimeType:@"image/png" error:&error]) {
        NSLog(@"error appending part: %@", error);
    }
}  progress:nil success:^(NSURLSessionTask *task, id responseObject) {
    NSLog(@"responseObject = %@", responseObject);
} failure:^(NSURLSessionTask *task, NSError *error) {
    NSLog(@"error = %@", error);
}];

if (!task) {
    NSLog(@"Creation of task failed.");
}
用户回答回答于

尝试将这个用于不同MIME类型的视频和图像数据。

NSDictionary *param;

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

// 1. Create `AFHTTPRequestSerializer` which will create your request.
AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer];
NSMutableURLRequest *request;

NSData *fileData;
if ([objDoc.url containsString:@".mp4"]) {
    manager.responseSerializer.acceptableContentTypes = [manager.responseSerializer.acceptableContentTypes setByAddingObject:@"application/json"];
    [serializer setValue:@"video/mp4" forHTTPHeaderField:@"Content-Type"];
    manager.requestSerializer = serializer;
}

// 2. Create an `NSMutableURLRequest`.

NSLog(@"filename =%@",objDoc.url);
request= [serializer multipartFormRequestWithMethod:@"POST" URLString:strUrl parameters:param constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

    if ([objDoc.url containsString:@".mp4"]) {
        [formData appendPartWithFileData:fileData
                                    name:@"File"
                                fileName:@"video.mp4"
                                mimeType:@"video/mp4"];

    }else{
        [formData appendPartWithFileData:fileData
                                    name:@"File"
                                fileName:@"image.jpeg"
                                mimeType:@"image/jpeg"];
    }

} error:nil];

// 3. Create and use `AFHTTPRequestOperationManager` to create an `AFHTTPRequestOperation` from the `NSMutableURLRequest` that we just created.

self.objeDocument.isUploading = [NSNumber numberWithInt:1];

self.operation = [manager HTTPRequestOperationWithRequest:request
                                                  success:^(AFHTTPRequestOperation *operation, id responseObject) {

                                                      NSLog(@"Success %@", responseObject);
                                                  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                                      UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error!" message:@"The document attached has failed to upload." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
                                                      [alert show];
                                                      [self.operation cancel];
                                                      NSLog(@"Failure %@", error.description);
                                                  }];


// 4. Set the progress block of the operation.
[self.operation setUploadProgressBlock:^(NSUInteger __unused bytesWritten,
                                         long long totalBytesWritten,
                                         long long totalBytesExpectedToWrite) {
    NSLog(@"Wrote %lld/%lld", totalBytesWritten, totalBytesExpectedToWrite);
    float progress = (float)totalBytesWritten/(float)totalBytesExpectedToWrite;


}];

// 5. Begin!
[self.operation start];

扫码关注云+社区

领取腾讯云代金券