发送图片到服务器

1.   //把图片转换为NSData  
2. UIImage *image = [UIImage imageNamed:@"name.png"];      
3. NSData *imageData = UIImagePNGRepresentation(image);  
4. // post url  
5. NSString *urlString = @"url";  
6.   
7. // setting up the request object now  
8. NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];  
9. [request setURL:[NSURL URLWithString:urlString]];  
10. [request setHTTPMethod:@"POST"];  
11. //  
12. NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];  
13. NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];  
14. [request addValue:contentType forHTTPHeaderField: @"Content-Type"];  
15. //  
16. NSMutableData *body = [NSMutableData data];  
17. [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];      
18. [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"vim_go.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];  
19. [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];  
20. [body appendData:[NSData dataWithData:imageData]];  
21. [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];  
22. [request setHTTPBody:body];  
23.   
24. NSLog(@"%@",body);  
25. NSLog(@"%@",request);  
26. NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    
27. NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    
28. result_btn.text = returnString;