Win32 编程添加控件及监听 2018-10-16

Win32编程系列文章：https://www.jianshu.com/nb/30332818

添加控件

在Hello World基础上，添加：

• wWinMain内部创建变量，使用的是如下的方法：

  //创建静态文本控件
  HWND hStatic = CreateWindow(
      TEXT("static"),  //静态文本框的类名
      TEXT("hahaha"),  //控件的文本
      WS_CHILD /*子窗口*/ | WS_VISIBLE /*创建时显示*/ | WS_BORDER /*带边框*/,
      120 /*X坐标*/, 20/*Y坐标*/, 150/*宽度*/, 80/*高度*/, hwnd/*父窗口句柄*/,
      (HMENU)1,  //为控件指定一个唯一标识符
      hInstance,  //当前实例句柄
      NULL
  );
  

• 类似可以创建按钮、输入框等，如下：

  // 下面一行代码创建输入框
  CreateWindow(L"EDIT", 0, WS_BORDER | WS_CHILD | WS_VISIBLE, 56, 10, 50, 18, hwnd, 0, hInstance, 0);
  
  // 下面一行代码创建按钮
  my_button = CreateWindow(L"BUTTON", L"一个按钮", WS_CHILD | WS_VISIBLE, 70, 70, 80, 25, hwnd, (HMENU)8, hInstance, 0);
  

• 创建下拉框的时候会比较麻烦，需要绑定数据，如下所示：

  TCHAR Planets[9][10] =
  {
      TEXT("Mercury"), TEXT("Venus"), TEXT("Terra"), TEXT("Mars"),
      TEXT("Jupiter"), TEXT("Saturn"), TEXT("Uranus"), TEXT("Neptune"),
      TEXT("Pluto??")
  };
  
  int xpos = 100;            // Horizontal position of the window.
  int ypos = 100;            // Vertical position of the window.
  int nwidth = 200;          // Width of the window
  int nheight = 200;         // Height of the window
  HWND hwndParent = hwnd; // Handle to the parent window
  
  HWND hWndComboBox = CreateWindow(L"COMBOBOX", TEXT(""),
      CBS_DROPDOWN | CBS_HASSTRINGS | WS_CHILD | WS_OVERLAPPED | WS_VISIBLE,
      xpos, ypos, nwidth, nheight, hwndParent, NULL, hInstance,
      NULL);
  
  TCHAR A[16];
  int  k = 0;
  
  memset(&A, 0, sizeof(A));
  for (k = 0; k <= 8; k += 1)
  {
      wcscpy_s(A, sizeof(A) / sizeof(TCHAR), (TCHAR*)Planets[k]);
  
      // Add string to combobox.
      SendMessage(hWndComboBox, (UINT)CB_ADDSTRING, (WPARAM)0, (LPARAM)A);
  }
  
  // Send the CB_SETCURSEL message to display an initial item 
  //  in the selection field  
  SendMessage(hWndComboBox, CB_SETCURSEL, (WPARAM)2, (LPARAM)0);
  

绑定事件

• 在WindowProc里面添加对应的switch-case，如下：

  wchar_t a[6] = TEXT("Dian0");
  int wmId = LOWORD(wParam);
  int wmEvent = HIWORD(wParam);
  switch (uMsg)
  {
  case WM_CLOSE:
      DestroyWindow(hwnd);
      break;
  case WM_DESTROY:
      PostQuitMessage(0);
      break;
  case WM_COMMAND:
      if (wmEvent == BN_CLICKED) {
          a[4] = L'0' + (a[4] - L'0' + 1) % 10;
          SetWindowText(my_button, a);
          break;
      }
      else if (wmEvent == CBN_SELCHANGE)
          // If the user makes a selection from the list:
          //   Send CB_GETCURSEL message to get the index of the selected list item.
          //   Send CB_GETLBTEXT message to get the item.
          //   Display the item in a messagebox.
      {
          int ItemIndex = SendMessage((HWND)lParam, (UINT)CB_GETCURSEL,
              (WPARAM)0, (LPARAM)0);
          TCHAR  ListItem[256];
          (TCHAR)SendMessage((HWND)lParam, (UINT)CB_GETLBTEXT,
              (WPARAM)ItemIndex, (LPARAM)ListItem);
          MessageBox(hwnd, (LPCWSTR)ListItem, TEXT("Item Selected"), MB_OK);
      }
      // Here don't write break on purpose!
  default:
      return DefWindowProc(hwnd, msg, wParam, lParam);
  }
  // 还是得要去处理default的事件