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, 183STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENUCAPTION "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,16,18,144,33END/////////////////////////////////////////////////////////////////////////////

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);elseMessageBox(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);elseMessageBox(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．