检查单选按钮 state winapi

Question

I use mingw32 compiler. I created two radioButton:

radio1 = CreateWindowExW(WS_EX_TRANSPARENT  , L"BUTTON", L"RadioButton1",
   WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON  ,
   0, 0, 0, 0,
   hwnd, (HMENU)ID_RADIOBTN1,
   GetModuleHandle(NULL), 0);
SendMessage(radioBtnDaily, WM_SETFONT, (WPARAM) font, TRUE);

radio2 = CreateWindowExW(WS_EX_TRANSPARENT  , L"BUTTON", L"RadioButton2",
   WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON  ,
   0, 0, 0, 0,
   hwnd, (HMENU)ID_RADIOBTN2,
   GetModuleHandle(NULL), 0);

SendMessage(radio1, BM_SETCHECK , (WPARAM) font, TRUE);
SendMessage(radio2,  WM_SETFONT, (WPARAM) font, TRUE);

And I handle the check state, something like this:

case WM_COMMAND:
    switch(LOWORD(wParam))
    {   
        case ID_RADIOBTN1:
        {
            MessageBoxW( NULL, "radio1 is checked", L"radio", MB_OK | MB_ICONERROR );
        }
        break;

        case ID_RADIOBTN2:
        {
        MessageBoxW( NULL, "radio2 is checked", L"radio", MB_OK | MB_ICONERROR );
        }
        break;
        ....

But this always run when I click the radiobutton so it not check the state. How to check the state without use the click event?

Answer 1

Use IsDlgButtonChecked :

if(IsDlgButtonChecked(hwnd, ID_RADIOBTN1))
    MessageBox(NULL, "radio1 is checked")
else
    MessageBox(NULL, "radio1 is not checked")

Answer 2

Use the BM_GETCHECK message, or the Button_GetCheck() macro, to get the radio button's actual state, eg:

radio1 = CreateWindowExW(WS_EX_TRANSPARENT  , L"BUTTON", L"RadioButton1",
   WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON  ,
   0, 0, 0, 0,
   hwnd, (HMENU)ID_RADIOBTN1,
   GetModuleHandle(NULL), 0);
SendMessage(radio1, WM_SETFONT, (WPARAM) font, TRUE);

radio2 = CreateWindowExW(WS_EX_TRANSPARENT  , L"BUTTON", L"RadioButton2",
   WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON  ,
   0, 0, 0, 0,
   hwnd, (HMENU)ID_RADIOBTN2,
   GetModuleHandle(NULL), 0);
SendMessage(radio2,  WM_SETFONT, (WPARAM) font, TRUE);

.

case WM_COMMAND:
    if ((HIWORD(wParam) == BN_CLICKED)
    {
        switch(LOWORD(wParam))
        {   
            case ID_RADIOBTN1:
            {
                switch (Button_GetCheck(radio1))
                {
                    case BST_CHECKED:
                        MessageBoxW( NULL, L"radio1 is checked", L"radio", MB_OK );
                        break;

                    case BST_INDETERMINATE:
                        MessageBoxW( NULL, L"radio1 is indeterminate", L"radio", MB_OK );
                        break;

                    case BST_UNCHECKED:
                        MessageBoxW( NULL, L"radio1 is unchecked", L"radio", MB_OK );
                        break;
                }
            }
            break;

            case ID_RADIOBTN2:
            {
                switch (Button_GetCheck(radio2))
                {
                    case BST_CHECKED:
                        MessageBoxW( NULL, L"radio2 is checked", L"radio", MB_OK );
                        break;

                    case BST_INDETERMINATE:
                        MessageBoxW( NULL, L"radio2 is indeterminate", L"radio", MB_OK );
                        break;

                    case BST_UNCHECKED:
                        MessageBoxW( NULL, L"radio2 is unchecked", L"radio", MB_OK );
                        break;
                }
            }
            break;
        }
    }
    break;

Answer 3

那么这取决于你想要检查按钮状态的事件，所以你需要某种交互（这可能是另一个事件，如窗口最小化，调整大小等或其他线程检查但不修改控件的状态）

Answer 4

It you need to test the state of the radio button, you can use (in pascal):

if SendMessage(hradiobutton, BM_GETCHECK, 0, 0) = BST_CHECKED

(this for checked state).

You can replace BST_CHECKED with all the constants listed at:

Documentation from Microsoft

Please, forgive my errors.