check radiobutton state winapi - c++

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

Well that depends on what event you want to check the status of the button so you need some sort of interaction (this can be another event like window minimized, resized etc or another thread checking but not modifying the state of your control)

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.