一、Windows对话框—建立「About」对话框
Windows程序即使不需要接收使用者输入，也通常具有由菜单上的「About」选项启动的对话框，该对话框用来显示程序的名字、图标、版权旗标和标记为「OK」的按键，也许还会有其它信息（例如技术支持的电话号码）。我们将要看到的第一个程序除了显示一个「About」对话框外，别无它用。这个ABOUT1程序如程序11-1所示：
程序11-1 ABOUT1
ABOUT1.C
/*------------------------------------------------------------------------
ABOUT1.C -- About Box Demo Program No. 1
(c) Charles Petzold, 1998
-------------------------------------------------------------------------*/
#include <windows.h>
#include "resource.h"
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("About1") ;
MSG msg ;
HWND hwnd ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (hInstance, szAppName) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = szAppName ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("About Box Demo Program"),
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 HINSTANCE hInstance ;
switch (message)
{
case WM_CREATE :
hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
return 0 ;
case WM_COMMAND :
switch (LOWORD (wParam))
{
case IDM_APP_ABOUT :
DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
break ;
}
return 0 ;
case WM_DESTROY :
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG :
return TRUE ;
case WM_COMMAND :
switch (LOWORD (wParam))
{
case IDOK :
case IDCANCEL :
EndDialog (hDlg, 0) ;
return TRUE ;
}
break ;
}
return FALSE ;
}
ABOUT1.RC （摘录）
//Microsoft Developer Studio generated resource script.
#include "resource.h"
#include "afxres.h"
/////////////////////////////////////////////////////////////////////////////
// Dialog
ABOUTBOX DIALOG DISCARDABLE 32, 32, 180, 100
STYLE DS_MODALFRAME | WS_POPUP
FONT 8, "MS Sans Serif"
BEGIN
DEFPUSHBUTTON "OK",IDOK,66,80,50,14
ICON "ABOUT1",IDC_STATIC,7,7,21,20
CTEXT "About1",IDC_STATIC,40,12,100,8
CTEXT "About Box Demo Program",IDC_STATIC,7,40,166,8
CTEXT "(c) Charles Petzold,
1998",IDC_STATIC,7,52,166,8
END
/////////////////////////////////////////////////////////////////////////////
// Menu
ABOUT1 MENU DISCARDABLE
BEGIN
POPUP "&Help"
BEGIN
MENUITEM "&About About1...", IDM_APP_ABOUT
END
END
/////////////////////////////////////////////////////////////////////////////
// Icon
ABOUT1 ICON DISCARDABLE "About1.ico"
RESOURCE.H （摘录）
// Microsoft Developer Studio generated include file.
// Used by About1.rc
#define IDM_APP_ABOUT 40001
#define IDC_STATIC -1
|
ABOUT1.ICO |
藉由后面章节中介绍的方法，您还可以在程序中建立图标和菜单。图示和菜单的ID名均为「About1」。菜单有一个选项，它产生一条ID名为IDM_APP_ABOUT的WM_COMMAND消息。这使得程序显示的图11-1所示的对话框。
