The source code is as follows:
#include <windows.h>
struct
{
int iStyle;
TCHAR * szText;
}button[] =
{
BS_PUSHBUTTON, TEXT("PUSHBUTTON"),
BS_DEFPUSHBUTTON, TEXT("DEFPUSHBUTTON"),
BS_CHECKBOX, TEXT("CHECKBOX"),
BS_AUTOCHECKBOX, TEXT("AUTOCHECKBOX"),
BS_RADIOBUTTON, TEXT("RADIOBUTTON"),
BS_3STATE, TEXT("3STATE"),
BS_AUTO3STATE, TEXT("AUTO3STATE"),
BS_GROUPBOX, TEXT("GROUPBOX"),
BS_AUTORADIOBUTTON, TEXT("AUTORADIOBUTTON"),
BS_OWNERDRAW, TEXT("OWNERDRAW")
};
#define NUM (sizeof button / sizeof button[0])
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("BtnLook");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT("This program requires Window NT!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow (szAppName, TEXT("Button Look"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL
);
ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndButton[NUM];
static RECT rect;
static TCHAR szTop[] = TEXT("message wParam lParam"),
szUnd[] = TEXT("_______ ______ ______"),
szFormat[] = TEXT("%-16s%04X-%04X %04X-%04X"),
szBuffer[50];
static int cxChar, cyChar;
HDC hdc;
PAINTSTRUCT ps;
int i;
switch (message)
{
case WM_CREATE:
cxChar = LOWORD(GetDialogBaseUnits());
cyChar = HIWORD(GetDialogBaseUnits());
for( i = 0; i < NUM; i++)
hwndButton[i] = CreateWindow(TEXT("button"), button[i].szText,
WS_CHILD | WS_VISIBLE | button[i].iStyle,
cxChar, cyChar * (1 + 2 * i),
20 * cxChar, 7 * cyChar / 4,
hwnd, (HMENU)i,
((LPCREATESTRUCT)lParam)->hInstance, NULL
);
return 0;
case WM_SIZE:
rect.left = 24 * cxChar;
rect.top = 2 * cyChar;
rect.right = LOWORD(lParam);
rect.bottom = HIWORD(lParam);
return 0;
case WM_PAINT:
InvalidateRect(hwnd, &rect, TRUE);
hdc = BeginPaint(hwnd, &ps);
SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT));
SetBkMode(hdc, TRANSPARENT);
TextOut(hdc, 24 * cxChar, cyChar, szTop, lstrlen(szTop));
TextOut(hdc, 24 * cxChar, cyChar, szUnd, lstrlen(szUnd));
EndPaint(hwnd, &ps);
return 0;
case WM_DRAWITEM:
case WM_COMMAND:
ScrollWindow(hwnd, 0, -cyChar, &rect, &rect);
hdc = GetDC(hwnd);
SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT));
TextOut(hdc, 24 * cxChar, cyChar * (rect.bottom / cyChar - 1),
szBuffer,
wsprintf(szBuffer, szFormat, message == WM_DRAWITEM ? TEXT("WM_DRAWITEM") : TEXT("WM_COMMAND"),
HIWORD(wParam), LOWORD(wParam),
HIWORD(lParam),LOWORD(lParam))
);
ReleaseDC(hwnd, hdc);
ValidateRect(hwnd, &rect);
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc (hwnd, message, wParam, lParam);
}The results are shown in the figure:
Left button not clicked:
Click the buttons on the left in turn:
