Question

我正在开发iOS 4.x设备的应用程序。我正在实现一个通信模块，其中in-in程序定期向服务器发送文件（有时一次多个文件）。我正在使用以下函数实现代码。我想知道，Apple的http代码如下支持“异步”方法（或）我是否必须使用某些第三方API，如“ASIHTTPRequest”来支持我的函数中的异步调用。请指教。

-(void) HttpUpload : (UIImage *) image :(NSString *) fileNameStr

{

NSData *imageData = UIImageJPEGRepresentation (image, 90);
NSString *urlString = @"http://iphone.zcentric.com/test-upload.php";

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

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

// Create body of the post..
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@.jpg\"\r\n", fileNameStr] 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]];

[request setHTTPBody:body];

// lets make the connection to the web
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *responseString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(responseString);

}

谢谢！

Answer 1

使用[[NSURLConnection alloc] initWithRequest:request delegate:self];然后实现委托方法。

修改尝试在代码中更改此内容删除这些行

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *responseString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

在此处添加

NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:request delegate:self]; //Warning. this is a leak. You have to use a propery so you can properly release later.

添加这些代表：

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ //Handle the error } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ //If you need to handle partial data do that here //This method can be called several times. So, may be you have to append the data in an NSMutableData object } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ //If you need to handle the response do that here } - (void)connectionDidFinishLoading:(NSURLConnection *)connection{ //This callback is the last one }

iPhone：http支持异步方法吗？

1 个答案: