win32sdk编程中，如果我要在窗口中显示文字或者图像，是不是窗口过程函数里一定要有处理WM_PAINT的case语句啊？

[neoadane]

win32sdk编程中，如果我要在窗口中显示文字或者图像，是不是窗口过程函数里一定要有处理WM_PAINT的case语句啊？
如果可以没有处理WM_PAINT的case语句，那WM_PAINT消息由谁来处理呢？DefWindowProc吗？

[EddieCai]

对

[lzg0001]

可以在其他消息的处理过程中绘制，如鼠标消息，但窗口一被覆盖就什么也没有了！所以最好在WM_PAINT消息中绘制！
你在创建窗口时要指定一个窗口过程函数，窗口的消息都在那是处理，DefWindowProc是windows提供的对所有消息进行默认处理的函数，对于你不想处理的消息都应传给该函数处理，以便维持程序的正常运行！

[CW_Wei]

up

[neoadane]

to：lzg0001(沧海中最不起眼的那一粟)
程序一运行，就一定会有WM_PAINT消息的，这时候窗口过程函数里没有处理WM_PAINT的case语句，那这个WM_PAINT消息由谁来处理？我贴一部分代码在下面
里面不管是WndProc 还是WndProc1，还是CheckBottom都没有处理WM_PAINT消息的case语句。
int CheckBottom (HWND hwnd, int cyClient, int iLine)
{
if (iLine * cyChar + cyChar > cyClient)
{
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow (hwnd) ;
iLine = 0 ;
}
return iLine ;
}

LRESULT APIENTRY WndProc1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum, iLine, cyClient ;
HDC hdc ;
TCHAR szBuffer[16] ;

switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;

case WM_TIMER:
if (iNum < 0)
iNum = 0 ;

iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;

TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum++)) ;

ReleaseDC (hwnd, hdc) ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
LRESULT APIENTRY WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[4] ;
static TCHAR * szChildClass[] = { TEXT ("Child1"), TEXT ("Child2"),
TEXT ("Child3"), TEXT ("Child4") } ;
static WNDPROC ChildProc[] = { WndProc1, WndProc2, WndProc3, WndProc4 } ;
HINSTANCE hInstance ;
int i, cxClient, cyClient ;
WNDCLASS wndclass ;

switch (message)
{
case WM_CREATE:
hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = NULL ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;

for (i = 0 ; i < 4 ; i++)
{
wndclass.lpfnWndProc = ChildProc[i] ;
wndclass.lpszClassName = szChildClass[i] ;

RegisterClass (&wndclass) ;

hwndChild[i] = CreateWindow (szChildClass[i], NULL,
WS_CHILDWINDOW | WS_BORDER | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU) i, hInstance, NULL) ;
}

cyChar = HIWORD (GetDialogBaseUnits ()) ;
SetTimer (hwnd, 1, 10, NULL) ;
return 0 ;

case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;

for (i = 0 ; i < 4 ; i++)
MoveWindow (hwndChild[i], (i % 2) * cxClient / 2,
(i > 1) * cyClient / 2,
cxClient / 2, cyClient / 2, TRUE) ;
return 0 ;

case WM_TIMER:
for (i = 0 ; i < 4 ; i++)
SendMessage (hwndChild[i], WM_TIMER, wParam, lParam) ;

return 0 ;

case WM_CHAR:
if (wParam == '\x1B')
DestroyWindow (hwnd) ;

return 0 ;

case WM_DESTROY:
KillTimer (hwnd, 1) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}

[vc_gdi]

lzg0001(沧海中最不起眼的那一粟) (
说的对
看看windows程序设计