Objective-C（将单个图像上传到服务器）

Question

全部，

我只是想从我的应用程序上传一个截图到一个服务器目录。截图代码的效果很好，因为我可以在另一个例程中通过SMS发送它，并且编译得很好，但是我没有使用下面的代码在服务器目录中看到图像。

我只是不能得到它的工作。我只关心上传screenshotimage变量......其余的数据对我来说并不重要。请帮忙！！！

- (IBAction)sendToServer { 
    UIGraphicsBeginImageContext(self.view.bounds.size); 
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
    UIImage *screenshotimage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 

    NSData *imageData = UIImageJPEGRepresentation(screenshotimage,0.2); 
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://www.nameofmywebsite.com/temp/image_from_payer_app"]]; 

    [request setHTTPMethod:@"POST"]; 
    NSString *boundary = @"xxxxBoundaryStringxxxx"; 
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary]; 
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"]; 

    NSMutableData *body = [NSMutableData data]; 

    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [body appendData:[@"Content-Disposition: form-data; name=\"userfile\"; filename=\"iphoneimage.jpg\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
    [body appendData:[@"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]; 
    [request addValue:[NSString stringWithFormat:@"%lu", (unsigned long)[imageData length]] forHTTPHeaderField:@"Content-Length"]; 

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

    NSLog(@"%@", returnString); 
} 

这是我的新代码。我只是试图发送一个单一的图像文件（这是应用程序的截图）到服务器。有人可以验证客户端代码是否正确，然后我可以专注于服务器端，看看为什么该文件不存放在服务器上？

- (IBAction)sendToServer { 

    UIGraphicsBeginImageContext(self.view.bounds.size); 
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
    UIImage *screenshotimage = UIGraphicsGetImageFromCurrentImageContext(); 


    NSData *imageData = UIImageJPEGRepresentation(screenshotimage,0.2); 

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://mywebsite.com/"]]; 

    [request setHTTPMethod:@"POST"]; 

    appendData:[NSData dataWithData:imageData]; 


    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 

    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; 

    NSLog(@"%@", returnString); 

    UIGraphicsEndImageContext(); 

    NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 

    if(conn) { 
     NSLog(@"Connection Successful"); 
    } else { 
     NSLog(@"Connection could not be made"); 
    } 
} 

Answer 1

您的客户端代码似乎没问题。服务器端可能存在一些问题。您的服务器可能无法检索图像。