NSData和通过POST在iOS上传图片

我已经梳理了iOS上通过POST上传图片的许多post。 尽pipe有关这个主题的丰富的信息，我不能设法正确上传从我的iPhone模拟器照片库采取的JPEG数据。 一旦在服务器上的数据，只是一个hex的庞大的string。 不应该只是一个字节streamNSData？ 我不明白所有的hex，或为什么这个代码似乎适用于其他人。

这是有问题的代码：

-(void)uploadWithUserLocationString:(NSString*)userLocation{ NSString *urlString = @"http://some.url.com/post"; // set up the form keys and values (revise using 1 NSDictionary at some point - neater than 2 arrays) NSArray *keys = [[NSArray alloc] initWithObjects:@"auth",@"text",@"location",nil]; NSArray *vals = [[NSArray alloc] initWithObjects:self.authToken,self.textBox.text,userLocation,nil]; // set up the request object NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:[NSURL URLWithString:urlString]]; [request setHTTPMethod:@"POST"]; //Add content-type to Header. Need to use a string boundary for data uploading. NSString *boundary = [NSString stringWithString:@"0xKhTmLbOuNdArY"]; NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary]; [request addValue:contentType forHTTPHeaderField: @"Content-Type"]; //create the post body NSMutableData *body = [NSMutableData data]; [body appendData:[[NSString stringWithFormat:@"--%@\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]]; //add (key,value) pairs (no idea why all the \r's and \n's are necessary ... but everyone seems to have them) for (int i=0; i<[keys count]; i++) { [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",[keys objectAtIndex:i]] dataUsingEncoding:NSASCIIStringEncoding]]; [body appendData:[[NSString stringWithFormat:@"%@",[vals objectAtIndex:i]] dataUsingEncoding:NSASCIIStringEncoding]]; [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]]; } [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"image\"\r\n"] dataUsingEncoding:NSASCIIStringEncoding]]; [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSASCIIStringEncoding]]; [body appendData:[NSData dataWithData:self.imageData]]; [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSASCIIStringEncoding]]; // set the body of the post to the reqeust [request setHTTPBody:body]; // make the connection to the web NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSLog(returnString); [keys release]; [vals release]; } 

谢谢你的时间。

Answer 1

此代码在我的应用程序中工作。 如果您不使用ARC，则需要修改代码以释放所有已分配的内容。

 // create request NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData]; [request setHTTPShouldHandleCookies:NO]; [request setTimeoutInterval:30]; [request setHTTPMethod:@"POST"]; // set Content-Type in HTTP header NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary]; [request setValue:contentType forHTTPHeaderField: @"Content-Type"]; // post body NSMutableData *body = [NSMutableData data]; // add params (all params are strings) for (NSString *param in _params) { [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] 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 NSData *imageData = UIImageJPEGRepresentation(imageToPost, 1.0); 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", FileParamConstant] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithString:@"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]]; // setting the body of the post to the reqeust [request setHTTPBody:body]; // set URL [request setURL:requestURL]; 

Answer 2

我希望这个代码将帮助一些其他的身体…

 //create request NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; //Set Params [request setHTTPShouldHandleCookies:NO]; [request setTimeoutInterval:60]; [request setHTTPMethod:@"POST"]; //Create boundary, it can be anything NSString *boundary = @"------VohpleBoundary4QuqLuM1cE5lMwCy"; // set Content-Type in HTTP header NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary]; [request setValue:contentType forHTTPHeaderField: @"Content-Type"]; // post body NSMutableData *body = [NSMutableData data]; //Populate a dictionary with all the regular values you would like to send. NSMutableDictionary *parameters = [[NSMutableDictionary alloc] init]; [parameters setValue:param1 forKey:@"param1-name"]; [parameters setValue:param2 forKey:@"param2-name"]; [parameters setValue:param3 forKey:@"param3-name"]; // add params (all params are strings) for (NSString *param in parameters) { [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithFormat:@"%@\r\n", [parameters objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]]; } NSString *FileParamConstant = @"imageParamName"; NSData *imageData = UIImageJPEGRepresentation(imageObject, 1); //Assuming data is not nil we add this to the multipart form 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", FileParamConstant] 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]]; } //Close off the request with the boundary [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; // setting the body of the post to the request [request setHTTPBody:body]; // set URL [request setURL:[NSURL URLWithString:baseUrl]]; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response; if ([httpResponse statusCode] == 200) { NSLog(@"success"); } }]; 

Answer 3

看看苹果的SimpleURLConnections示例项目。 您可以使用PostController进行一些修改。

但是 – 这并不简单。 上述解决scheme的不同之处在于，Apple正在使用stream将文件传输到服务器。 这比在上传期间保持编码的图像数据更方便内存。 这也是更复杂的方式。

Answer 4

 NSData *imgData = UIImagePNGRepresentation(imgUser.image); NSString *str=[NSString stringWithFormat:@"%@upload_image",appDelegate.strRoot]; NSString *urlString = [NSString stringWithFormat:@"%@",str]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setURL:[NSURL URLWithString:urlString]]; [request setHTTPMethod:@"POST"]; NSMutableData *body = [NSMutableData data]; NSString *boundary = @"---------------------------14737809831466499882746641449"; NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary]; [request addValue:contentType forHTTPHeaderField: @"Content-Type"]; [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[@"Content-Disposition: form-data; name=\"file\"; filename=\"a.jpg\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[NSData dataWithData:imgData]]; [body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; // parameter UserId [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userid\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[appDelegate.strUserID dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; // close form [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; // setting the body of the post to the request [request setHTTPBody:body]; NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; // NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:returnData options:NSJSONReadingMutableLeaves error:nil]; NSLog(@"%@",dict); 

Answer 5

我看到你在一个请求中发送多个文件，对吗？

从HTTP规范中 ，您应该在embeddedmultipart / form-data中使用multipart / mixed Content-type

上面的链接示例：

 Content-type: multipart/form-data, boundary=AaB03x --AaB03x content-disposition: form-data; name="field1" Joe Blow --AaB03x content-disposition: form-data; name="pics" Content-type: multipart/mixed, boundary=BbC04y --BbC04y Content-disposition: attachment; filename="file1.txt"