win32之复选框

win32.


获取和设置选择状态
BM_SETCHECK
  wParam -- 状态
  lparam  -- 不用,给0;
BM_GETCHECK:
   wParam/lParam-- 都为0,其状态通过SendMessage 的返回值判断


返回值:
BST_CHECKED
BST_UNCHECKED
   
   //手动 复选框 自己维护
CreateWindowEx(0, L"BUTTON", L" CheckBox", WS_CHILD | WS_VISIBLE | BS_CHECKBOX,
50, 100, 200, 30, hWnd, (HMENU)1003, hInst, NULL);
 // 自动复选框 系统维护
CreateWindowEx(0, L"BUTTON", L" AutoCheckBox", WS_CHILD | WS_VISIBLE | BS_AUTOCHECKBOX,
50, 140, 200, 30, hWnd, (HMENU)1004, hInst, NULL);
 // 三态 自己维护
CreateWindowEx(0, L"BUTTON", L"3State", WS_CHILD | WS_VISIBLE | BS_3STATE,
50, 180, 200, 30, hWnd, (HMENU)1005, hInst, NULL);
// 自动三态 系统维护
CreateWindowEx(0, L"BUTTON", L"Auto3State", WS_CHILD | WS_VISIBLE | BS_AUTO3STATE,
50, 220, 200, 30, hWnd, (HMENU)1006, hInst, NULL);
手动设置复选框状态:
case WM_COMMAND:
wmId    = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// 分析菜单选择: 
switch (wmId)
{
case 1003:
{
// wmId = LOWORD(wParam);
// wmEvent = HIWORD(wParam);
if (wmEvent == BN_CLICKED)
{
//MessageBox(NULL, L"....", L"Infor", MB_OK);
HWND child = GetDlgItem(hWnd, 1003);
int ret = SendMessage(child, BM_GETCHECK, 0, 0);


if (ret == BST_CHECKED)
{
SendMessage(child, BM_SETCHECK, BST_UNCHECKED, 0);
// MessageBox(NULL, L"....", L"Infor", MB_OK);
}
else
SendMessage(child, BM_SETCHECK, BST_CHECKED, 0);
}
}