VC创建模态对话框

模态窗口的创建由DialogBox()函数。

首先定义几个id：

#define ID_FILE_EXIT 900
#define ID_STUFF_GO 9002
#define ID_HELP_ABOUT 9003
#define IDD_ABOUT     101

对话框的资源文件如下：

/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

IDD_ABOUT DIALOGEX 0, 0, 316, 183
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "My About Box"
FONT 8, "MS Sans Serif"
BEGIN
    DEFPUSHBUTTON   "&OK",IDOK,174,18,50,14
    PUSHBUTTON      "&Cancel",IDCANCEL,174,35,50,14
    GROUPBOX        "About this program...",IDC_STATIC,7,7,225,52
    CTEXT           "An example program showing how to use Dialog Boxes\r\n\r\nby wql",
                    IDC_STATIC,16,18,144,33
END

/////////////////////////////////////////////////////////////////////////////

开始创建对话框：

BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	switch(Message)
	{
	case WM_INITDIALOG:
		return TRUE;
	case WM_COMMAND:
		switch(LOWORD(wParam))
		{
		case IDOK:
			EndDialog(hwnd, IDOK);
			break;
		case IDCANCEL:
			EndDialog(hwnd, IDCANCEL);
			break;
		}
		break;
	default:
		return FALSE;
	}
	return TRUE;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch(msg)
	{
	case WM_CREATE:
		{
			HMENU hMenu, hSubMenu;
			HICON hIcon, hIconSm;
			hMenu = CreateMenu();
			hSubMenu = CreatePopupMenu();
			AppendMenu(hSubMenu, MF_STRING, ID_FILE_EXIT, "E&xit");
			AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT)hSubMenu, "&File");
			hSubMenu = CreatePopupMenu();
			AppendMenu(hSubMenu, MF_STRING, ID_STUFF_GO, "&Go");
			AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT)hSubMenu, "&Stuff");
			hSubMenu = CreatePopupMenu();
			AppendMenu(hSubMenu,MF_STRING , ID_HELP_ABOUT, "&About");
			AppendMenu(hMenu,MF_STRING | MF_POPUP, (UINT)hSubMenu, "&Help");
			SetMenu(hwnd, hMenu);
			hIcon = (HICON)LoadImage(NULL, "icon1.ico", IMAGE_ICON, 32, 32, 
				LR_LOADFROMFILE);
			if(hIcon)
				SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM)hIcon);
			else
				MessageBox(hwnd, "Could not load large icon!", "Error", MB_OK | 
				MB_ICONERROR);
			hIconSm = (HICON)LoadImage(NULL, "icon1.ico", IMAGE_ICON, 16, 16, 
				LR_LOADFROMFILE);
			if(hIconSm)
				SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)hIconSm);
			else
				MessageBox(hwnd, "Could not load small icon!", "Error", MB_OK | 
				MB_ICONERROR);
		}
		break;
	case WM_COMMAND:
		switch(LOWORD(wParam))
		{
		case ID_HELP_ABOUT:
			{
				int ret = DialogBox(GetModuleHandle(NULL), 
					MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc); //创建模态窗口
				if(ret == IDOK){
					MessageBox(hwnd, "Dialog exited with IDOK.", "Notice",
						MB_OK | MB_ICONINFORMATION);
				}
				else if(ret == IDCANCEL){
					MessageBox(hwnd, "Dialog exited with IDCANCEL.", "Notice",
						MB_OK | MB_ICONINFORMATION);
				}
				else if(ret == -1){
					MessageBox(hwnd, "Dialog failed!", "Error",
						MB_OK | MB_ICONINFORMATION);
				}
			}
			break;
		case ID_FILE_EXIT:
			PostMessage(hwnd,WM_CLOSE,NULL,NULL);
			break;
		case ID_STUFF_GO:
			MessageBox(hwnd,"you click the GO","Menu MessageBox",MB_OK | MB_ICONEXCLAMATION);
			break;
		}
		break;
	case WM_LBUTTONDOWN:
		{
			char szFileName[MAX_PATH];
			HINSTANCE hInstance = GetModuleHandle(NULL);
			GetModuleFileName(hInstance, szFileName, MAX_PATH);
			MessageBox(hwnd, szFileName, "This program is:", MB_OK | 
				MB_ICONINFORMATION);
		}
		break;
	case WM_CLOSE:
		DestroyWindow(hwnd);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd, msg, wParam, lParam);
	}
	return 0;
}

这就是我用来创建我的关于对话框的代码，你应该看出来这应该移到你的WM_COMMAND消息处理的代码中去，如果你对这点还不清楚，你可能需要复习关于菜单的那篇文章．ID_HELP_ABOUT是我的Help->About菜单项的标识．

　　因为我们要我们的主窗口的菜单来创建这个对话话，我们显然需要把这些代码放到我们主窗口的WndProc()中去，而不是对话框的过程中．

　　现在我存储了调用DialogBox()的返回值，这样你就可以观察你点击两个按钮的效果，在对话框中按Esc，Enter等等．．．这样做也展示了如何通过对话框的返回值来判断是否调用成功，和用戶用选择，或是你想从你的对话框过程中想返回给调用者的任何消息．

DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc);

　　这是唯一重要的地方，你可以把这段代码放到你想要对话框出现的任何地方．IDD_ABOUT是对话框资源的标识．hwnd是对话框的父窗口的句柄.AboutDlgProc()当然是用来控制对话框的对话过程．