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我正在尝试使用以下代码发布带有来自 iOS 应用程序的图像的墙消息：

- (void) putOnFacebookWall:(UIImage *) screenShot{

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"temp.png"];

    [UIImagePNGRepresentation(screenShot) writeToFile:filePath options:NSAtomicWrite error:nil];

    NSData *imageData = UIImagePNGRepresentation([UIImage imageNamed:@"ironman.jpg"]);

    NSURL *url = [NSURL URLWithString:@"https://graph.facebook.com/me/feed"];
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];

    //
    [request setPostValue:imageData forKey:@"picture"];

    [request setPostValue:@"http://apps.facebook.com/mobie-hair-wizz" forKey:@"link"];

    [request setPostValue:@"test" forKey:@"message"];

    [request setPostValue:[defaults objectForKey:@"FBAccessTokenKey"] forKey:@"access_token"];
    [request setDidFinishSelector:@selector(sendToPhotosFinished:)];

    [request setDelegate:self];
    [request startAsynchronous];

}

我得到的是：

https://www.dropbox.com/s/z5nzm271zkadq4j/wall.png?m

图片不显示是什么原因？

我也在FB的iOS代码中得到了肯定的回应，说上传成功。

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