从MFC中的工作线程调用Beginwaitcursor函数

Question

Can someone help me in understanding the worker threads in VC++(MFC)? Following is my workerthread function

UINT ThreadFunc(LPVOID pParam)
{
// some initialization... etc..

AfxGetApp()->BeginWaitCursor();

...
..
/// some operations

AfxGetApp()->End WaitCursor();

}

Is it okay to call WaitCursor() functions from a worker thread?

Answer 1

The documentation available for BeginWaitCursor and EndWaitCursor make no mention of issues related to threading.

The one thing that is mentioned,

The actions of BeginWaitCursor are not always effective outside of a single message handler as other actions, such as OnSetCursor handling, could change the cursor.

Other threads can change the cursor as well while your worker thread is working.

Also you need to consider the actions of the CWnd message handler OnSetCursor() which handles the WM_SETCURSOR message if the ON_WM_SETCURSOR() macro is added to the message map for a CWnd derived class. See Prevent MFC application to change cursor back to default icon