C++记录鼠标释放
我试图让一个程序在释放鼠标左键并且仅释放时写入文本文件。下面是我尝试过的代码。 GUI 中有一个滑块，用户可以前后移动来放大和缩小视频。我希望能够只获取用户停止的值。目前，它打印起始值和停止值以及其间的所有值。我认为让它在鼠标释放时打印停止值会起作用。目前它仍然只打印所有信息，而不仅仅是鼠标释放的信息。
if(WM_LBUTTONUP)
{
myfile1.open("testing.txt", std::ios_base::app);
myfile1 << "testing";
myfile1 << "\n";
myfile1.close();
}
I am trying to get a program to write to a text file when the left button on the mouse is released, and only released. Below is the code that I have tried. In the GUI there is a slider that the user can move back and forth to zoom in and out on a video with. I want to be able to grab just the value the user stops at. Currently it prints the starting and stopping values as well as all the values in between. I thought that getting it to print the stopping value on the mouse release would work. Currently it still just prints all the info not just on the mouse release.
if(WM_LBUTTONUP)
{
myfile1.open("testing.txt", std::ios_base::app);
myfile1 << "testing";
myfile1 << "\n";
myfile1.close();
}
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您的条件始终为真，因为
WM_LBUTTONUP是一个非零常量。您应该比较 WindowProc 回调。Your condition is always true because
WM_LBUTTONUPis a non-zero constant. You should compare auMsg == WM_LBUTTONUPin your WindowProc callback.