Question

我遇到了一个问题 - [NSConcreteMutableData release]：发送到deallocated实例的消息，我也附上了我的示例代码。

- (IBAction)uploadImage {

NSString *urlString = @"http://192.168.1.108/iphoneimages/uploadfile.php?userid=1&charid=23&msgid=3";


//if(FALSE)
for (int i=0; i<[imgArray count]; i++) {

    // setting up the request object now
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];

    /*
    add some header info now
    we always need a boundary when we post a file
    also we need to set the content type

    You might want to generate a random boundary.. this is just the same 
    as my output from wireshark on a valid html post
 */
    NSString *boundary = [NSString stringWithString:@"---------------------------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] autorelease];

    NSString *str = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"ipodfile%d.jpg\"\r\n",i];

    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];    
    [body appendData:[[NSString stringWithString:str] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];


    NSData *imageData = UIImageJPEGRepresentation([imgArray objectAtIndex:i], 90);
    [body appendData:[NSData dataWithData:imageData]];


    [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
    [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    //NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    //NSLog(@"%@",returnString);
    [imageData release];

    [request release];
    //[body release];
}
}

它成功地将图像上传到文件夹并且执行中没有任何错误但是当它完成它并且尝试返回它时会给出错误 - [NSConcreteMutableData release]：发送到解除分配的实例的消息

请帮帮我。

由于

Answer 1

UIImageJPEGRepresentation返回一个自动释放的对象并释放它。当它自动释放时会爆炸。

Answer 2

NSMutableData *body = [[NSMutableData data] autorelease];

删除该自动发布消息

- [NSConcreteMutableData release]：发送给解除分配的实例的消息

2 个答案: