CString->char*

CString strSource;//宣告CString
char* charSource; //宣告char*

法1：
charSource = (char*)strSource.GetBuffer(0);

法2：
charSource = (char*)strSource.GetBuffer(strSource.GetLength());

法3：
charSource = (char*)(LPCTSTR)strSource;

char*->CString

char* temp;

....

//生成我們需要的CString對象
CString str(temp);

char*->LPCTSTR

char* res=..;
LPCTSTR lpc;
lpc = (LPCTSTR)(LPCTSTR)res;

CString->char*.,char*->CString,char*->LPCTSTR