如何停止从文件读取? [英] How to stop reading from a file?

问题描述

代码更新如下，现在我可以重新启动，但直到再次单击按钮后才能停止.

The Code is updated as below now I am able to restart but the not able to stop untill I Click button again.

void CDemoDlg::ReadFileTxt()
{
	
	CFileException fileException;
       if (readFile.Open(strFilePath, CFile::modeRead, &fileException))
       {
            while ((stopSong==true )&&readFile.ReadString(strLine)){}
           
        }
}


void CDemoDlg::OnBnClickedSongPlay()
{
if(stopSong==true)
{
	
	
	stopSong=false;
	readFile.Close(); /*stops but resumes immediately so could not recognize that it actually stopped*/

	
}
else
{
	stopSong=true;
	OnLbnSelchangeListSongs();
	
}

}

推荐答案

您应将读取的内容放入工作线程中，并从GUI线程向该线程发出停止读取"状态的信号(即主线程)设置标志.
例如

You should put the reading stuff inside a worker thread and signal to such thread the ''stop reading'' condition from the GUI one (i.e. the main thread) setting a flag.
e.g.

// worker thread, the 'stop_reading' variable is set by the GUI thread on button click
if (readFile.Open(strFilePath, CFile::modeRead, &fileException)) 
{ 
    while (readFile.ReadString(strLine) && stop_reading == false) { }
} 

现在DigiManus的问题就存在了.您现在有一个已经解释的问题.您尝试过的是什么?

给你一些线索.
1.实现按钮功能
2.使用Ftell/fseek函数进行恢复.
3.关闭功能以关闭文件.

Now DigiManus''s question comes to existance. You have a problem now which you have explained. What is that you have tried??

To give you some clues.
1. Implement the Button function
2. Use Ftell/fseek functions for resuming.
3. Close function to close the file.

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