win32程序不响应鼠标双击事件的原因
一种容易让人忘记的原因就是 A window can receive double click messages,
WM_LBUTTONDBCLK or WM_RBUTTONDBCLK, if and only if its window
class has CS_DBLCLKS style flag, else the window will receive only a
series of mouse button up and down messages.