win32 question

["chris" <chrisy2k@citiz.net>]

Hi,

    I'v learned WIN32 API programming for 3 days,now i meet with a question,wish somebody can give me a hand.

    When I wirte some code in message procedure(or something like this),just like following:

switch(message){

    case WM_ABC:...

    case WM_DEF:...

    .

    .

    .

}

why can't I declar varibles such as: TCHAR * lpStr=TEXT("abc") under these cases,just like following:

switch(message){

    case WM_ABC:TCHAR * lpStr=TEXT("abc"); /* error line */

                hdc=GetDC(hwnd);

                TextOut(hdc,0,0,lpStr,lstrlen(lpStr));

                ReleaseDC(hwnd,hdc);

                return 0;

    case WM_CDE:...

    .

    .

    .

}

if I do this code,compiler will occur errors,BUT when I move /* error line */up,just below LRESULT CALLBACK WndProc(...){

the program works well.But why?Can somebody tell me.THX

 

chris tj