循环不会更新列表框，直到它完成迭代 [英] Loop doesn't update listboxes until it is done iterating

问题描述

我有一个循环，从列表框中获取文件名，执行一个system（）调用，然后将该文件名移动到另一个列表框。问题是，它不会一次移动文件名一个，但等待，直到整个循环完成，并一次移动它们。

I have a loop that takes file name from a listbox, performs a system() call, then moves that filename to another listbox. Problem is, it doesn't move the filenames over one at a time, but waits until the entire loop is finished and moves them all at once. What would I do to get it to perform how I want it to?

循环：

for each( String^% file in filename )
{
    int x = convert( file );
    lbComplete->Items->Add( lbFiles->Items[0] );    // place the completed file
    lbFiles->Items->Remove( lbFiles->Items[0] );    // in the other listbox
}

包含系统调用的convert ：

The function convert() that contains the system call:

int convert( String^ file )
{
    std::stringstream ss;
    std::string dir, fileAddress, fileName, outputDir;
    ...
    return system( ss.str().c_str() );          
}

推荐答案

刷新函数在循环结束时强制它重绘你的列表框，否则它会等待循环之后这样做。

You would need to call a refresh function at the end of your loop forcing it to redraw your listboxes otherwise it will wait until after your loop to do so.

for each( String^% file in filename )
{
    int x = convert( file );
    lbComplete->Items->Add( lbFiles->Items[0] );    // place the completed file
    lbFiles->Items->Remove( lbFiles->Items[0] );    // in the other listbox
    // INSERT REFRESH FUNCTION HERE
}

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