QHttp get()下载网络图片时，文件已创建，但是为0字节

[kidscannan]

代码如下：
QHttp http;

bool HttpGet::getFile(const QUrl &url,const QString filepath)
{
QFile *file;
file = new QFile(filepath);

if (!file->open(QIODevice::WriteOnly))
{
delete file;
file = 0;
return false;
}

http.setHost(url.host(), url.port(80));
http.get(url.path(),file);
http.close();

return true;
}
求解。。。。

[ancheel]

把文件关了。
file.close();

[kidscannan]

[Quote=引用 1 楼 ancheel 的回复:]

把文件关了。
file.close();
[/Quote]还是不行，下载不是每次都失败，偶尔也会成功

[warknife]

原理性错误！！！！
Qhttp的get方法是非阻塞的！！！
The function does not block; instead, it returns immediately. The request is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by requestStarted() and requestFinished().

[ancheel]

[Quote=引用 4 楼 warknife 的回复:]

原理性错误！！！！
Qhttp的get方法是非阻塞的！！！
The function does not block; instead, it returns immediately. The request is scheduled, and its execution is performed asynchronously. The function returns a unique id……
[/Quote]

的确如此。因为以前别人问过这问题，原因都是没把文件关了。这次粗心没细看他代码，只找看看没有有file.close()就回了。。

[kidscannan]

somebody,anybody,help

[kidscannan]

[Quote=引用 5 楼 ancheel 的回复:]

引用 4 楼 warknife 的回复:

原理性错误！！！！
Qhttp的get方法是非阻塞的！！！
The function does not block; instead, it returns immediately. The request is scheduled, and its execution is performed asynchronously. The func……
[/Quote]那怎样进行改进才可以正常下载呢？新手，求指教。谢谢

[warknife]

qt安装完毕后 examples\network\http 下就有个范例程序，机制一样....

[kidscannan]

[Quote=引用 7 楼 warknife 的回复:]

qt安装完毕后 examples\network\http 下就有个范例程序，机制一样....
[/Quote]之前也想用那个例子做参考，但是我觉得只是下载图片而已，不是下什么特别大的东西，就另外参考了QHttp，看来又回到之前的方法了。不过还是要谢谢，这期间又学了不少东西，