问NSURLRequest setHttpBody

EN

// set header value ,   some random text that will never occur in the body  
NSString *boundary = @"---------------------------14737809831466499882746641449";   NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];   [request addValue:contentType forHTTPHeaderField: @"Content-Type"];         /*   now lets create the body of the post      */   NSMutableData *body = [NSMutableData data];              //  email part         
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];        
[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"email\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];   
[body appendData:[anEmail dataUsingEncoding:NSUTF8StringEncoding]];     
[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];          //  password part     [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];     
[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"password\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];    
[body appendData:[aPassword dataUsingEncoding:NSUTF8StringEncoding]];     
[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];          //  image part     [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];        
[body appendData:[[NSString stringWithFormat: @"Content-Disposition: form-data; name=\"uploadingImage\"; filename=%@\r\n", anImageName]                        dataUsingEncoding:NSUTF8StringEncoding]];    
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];   
[body appendData:[NSData dataWithData:aFileData]];     
[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];             
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];  
// setting the body of the post to the reqeust  
[request setHTTPBody:body];         // now lets make the connection to the web  
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];