NSURL 和 NSURLConnection 不适用于 Google Chart API

发布于 2024-11-02 19:28:51 字数 741 浏览 0 评论 0原文

我尝试显示 Google Chart API 返回的图像，但以下代码不起作用：

NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World"]];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
imgView.image = downloadedImage;

或

NSData *imageData=[NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World"]] returningResponse:nil error:nil];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
imgView.image = downloadedImage;

目标图像未按预期显示。您知道问题出在哪里吗？

原文

I tried to display an image returned by Google Chart API, but the codes below do not work:

NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World"]];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
imgView.image = downloadedImage;

NSData *imageData=[NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World"]] returningResponse:nil error:nil];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
imgView.image = downloadedImage;

The target image was not shown as expected. Do you have any idea where the problem was?

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那支青花 2024-11-09 19:28:52

这两段代码都有效，除了 NSURL 对象为零。 NSURL 不支持管道字符 (|)，因此需要使用 %7c 进行转义。您可以使用 [NSString stringByAddingPercentEscapesUsingEncoding:] 来处理任何其他字符。这是新版本：

NSString *url = [@"http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
imgView.image = downloadedImage;

Both pieces of code work, except the NSURL object is nil. NSURL does not support pipe characters (|), so you need to escape it with %7c. You could use [NSString stringByAddingPercentEscapesUsingEncoding:] to take care of any other characters. Here is the new version:

NSString *url = [@"http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
imgView.image = downloadedImage;

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