多线程CString参数传递问题

代码如下：

void CallThreadFun()

   2: {

;

   4:     HANDLE hThread=::CreateThread(NULL,NULL,ThreadFunc,(LPVOID)(LPCTSTR)str,0,&thID);

   5:     CloseHandle(hThread);    

   6: }

   7:  

   8: DWORD WINAPI ThreadFunc(LPVOID lpParam)

   9: {

  10:     CString strPath=(LPCWSTR)lpParam;

  11:     doSomething(strPath);

  12:     ....

  13: }