Ways to access member variables in thread functions __ function

To start a thread with AfxBeginThread, there are two ways to define a thread's execution function:

1. Global function: UINT threadmessageboxadapter (LPVOID lParam);

2. Static member function: Static UINT threadmessageboxadapter (LPVOID lParam);

Our general experience is that the use of variables in a thread must be global, and member variables are defined as static to access member variables in thread functions.

This shows a way to access a member variable in a thread function:

This defines the thread class:

Class Thread

{

Public

Static UINT Threadmessageboxadapter (LPVOID lParam);

UINT Threadmessageboxproc ();

Private

CString Strthreadtext;

};

Implementation of thread functions:

UINT Thread::threadmessageboxadapter (LPVOID lParam)

{

ctestvectordlg* obj = (ctestvectordlg*) LParam;

return Obj->threadmessageboxproc ();

}

UINT Thread::threadmessageboxproc ()

{

CString Strthreadtext;

Strthreadtext.format (_t ("%s"), _t ("Thread adapter"));

AfxMessageBox (Strthreadtext);

return 0;

}

To start a thread using AfxBeginThread:

cwinthread* thread;

Thread = AfxBeginThread (Threadmessageboxadapter, this);

This way, when the thread starts, the message "Thread Adapter" pops up, stating that the member variable has been successfully accessed.