c++ - waitForReadyRead 返回空字符串 - 为什么它不阻塞？

Question

我目前有一个阻塞模型，我的客户端接收数据的代码如下

QByteArray tick_stream;
clntSocket->waitForReadyRead(-1);
tick_stream = clntSocket->read(800);

现在我相信 clntSocket->waitForReadyRead(); 应该只在有数据要从套接字读取时解除阻塞，但是它似乎自己解除阻塞并且 tick_stream 是空的任何关于可能的建议会出错吗？

Answer 1

您应该检查错误，因为该方法可能会在出错时立即返回。

来自 QtDoc :

bool QIODevice::waitForReadyRead(int msecs) [virtual]

Blocks until new data is available for reading and the readyRead() signal has been emitted, or until msecs milliseconds have passed. If msecs is -1, this function will not time out.

Returns true if new data is available for reading; otherwise returns false (if the operation timed out or if an error occurred).