VS2013 中 CString类型转换为LPCSTR类型

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HWND hWnd = ::FindWindow(NULL, L"XXXXXXX"); if (hWnd != NULL) {     DWORD dwReadBytes;     unsigned char *lpbuffer = (unsigned char *)malloc(10 * 1024 * 1024);;           USES_CONVERSION;     LPCSTR path = (LPCSTR)T2A(m_strDescPath); //m_strDescPath为一edit组件的成员变量       HFILE splhandle = _lopen(path, 0);     dwReadBytes = _lread(splhandle, lpbuffer, 10 * 1024 * 1024);       COPYDATASTRUCT cpd; /*给COPYDATASTRUCT结构赋值*/                         //cpd.dwData = 1;                                                                                                         //标志发送字符串                         //cpd.cbData = strlen("字符串")+1;                         //cpd.lpData = "字符串";                         //::SendMessage(hWnd,WM_COPYDATA,NULL,(LPARAM)&cpd);//发送！       cpd.dwData = 1; //标志发送CString类型     cpd.cbData = dwReadBytes;     cpd.lpData = lpbuffer;     ::SendMessage(hWnd, WM_COPYDATA, NULL, (LPARAM)&cpd); //发送！ }