Modal and Modeless Dialogbox

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////////////////////////////////////////////////////////////////////////////
//Microsoft Visual Studio generated resource script.
/////////////////////////////////////////////////////////////////////////////
/*
IDD_MODELESS DIALOG DISCARDABLE 0, 0, 186, 90
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "MS Sans Serif"
BEGIN
CONTROL "Red",IDC_RED,"Button",BS_AUTORADIOBUTTON,17,23,84,10
CONTROL "Yellow",IDC_YELLOW,"Button",BS_AUTORADIOBUTTON,17,41,84,
10
CONTROL "Green",IDC_GREEN,"Button",BS_AUTORADIOBUTTON,17,57,84,
10
GROUPBOX "Static",IDC_STATIC,7,15,126,59
END

IDD_MODAL DIALOG DISCARDABLE 0, 0, 186, 90
STYLE DS_SYSMODAL | DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "MS Sans Serif"
BEGIN
LTEXT "Static",IDC_STATIC1,26,23,75,16
END
*/
/////////////////////////////////////////////////////////////////////////////

#include 
#include "resource.h"

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK ModelessDialogProc(HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK ModalDialogProc(HWND, UINT, WPARAM, LPARAM);

void CreateModelessDialogBox(HWND);
void CreateModalDialogBox(HWND);

HBRUSH hBrush;
COLORREF bk_color = RGB(255,255,255);

int WINAPI wWinMain(HINSTANCE hInstance,
                    HINSTANCE hPrevInstance,
                    PWSTR pCmdLine,
                    int nCmdShow)
{
    MSG msg;
    HWND hwnd;

    WNDCLASS wc = {0};

    wc.lpszClassName = TEXT("myWindowClass");
    wc.hInstance     = hInstance;
    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wc.lpfnWndProc   = WndProc;

    RegisterClass(&wc);

    hwnd = CreateWindow(
        wc.lpszClassName,
        TEXT("Dialog Box Demo"),
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        100,
        100,
        700,
        200,
        NULL,
        NULL,
        hInstance,
        NULL);

    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hwnd,
                         UINT msg,
                         WPARAM wParam,
                         LPARAM lParam)
{
    static HINSTANCE hInst = GetModuleHandle(NULL);

    switch(msg)
    {

    case WM_CREATE:

        CreateWindow(
            TEXT("BUTTON"),
            TEXT("Show Modeless"),
            WS_CHILD | WS_VISIBLE,
            20,
            50,
            130,
            35,
            hwnd,
            (HMENU)IDD_MODELESS,
            NULL,
            NULL);

        CreateWindow(
            TEXT("BUTTON"),
            TEXT("Show Modal"),
            WS_CHILD | WS_VISIBLE,
            170,
            50,
            130,
            35,
            hwnd,
            (HMENU)IDD_MODAL,
            NULL,
            NULL);

        hBrush = CreateSolidBrush(bk_color);

        return 0;


    case WM_ERASEBKGND:
    {
        RECT rc;

        GetClientRect(hwnd,&rc);

        FillRect((HDC)wParam,&rc,hBrush);

        return TRUE;
    }


    case WM_COMMAND:

        switch(LOWORD(wParam))
        {

        case IDD_MODELESS:

            CreateDialog(
                hInst,
                MAKEINTRESOURCE(IDD_MODELESS),
                hwnd,
                ModelessDialogProc);

            break;

        case IDD_MODAL:

            DialogBox(
                hInst,
                MAKEINTRESOURCE(IDD_MODAL),
                hwnd,
                ModalDialogProc);

            break;
        }

        return 0;


    case WM_DESTROY:

        DeleteObject(hBrush);

        PostQuitMessage(0);

        return 0;
    }

    return DefWindowProc(hwnd,msg,wParam,lParam);
}



BOOL CALLBACK ModelessDialogProc(HWND hwnd,
                                 UINT msg,
                                 WPARAM wParam,
                                 LPARAM lParam)
{
    HWND mainWindow = GetParent(hwnd);

    switch(msg)
    {

    case WM_INITDIALOG:

        return TRUE;


    case WM_COMMAND:

        if(HIWORD(wParam)==BN_CLICKED)
        {

            DeleteObject(hBrush);

            switch(LOWORD(wParam))
            {

            case IDC_RED:

                bk_color = RGB(255,0,0);
                break;

            case IDC_YELLOW:

                bk_color = RGB(255,255,0);
                break;

            case IDC_GREEN:

                bk_color = RGB(0,255,0);
                break;
            }

            hBrush = CreateSolidBrush(bk_color);

            InvalidateRect(mainWindow,NULL,TRUE);
        }

        return TRUE;


    case WM_CLOSE:

        DestroyWindow(hwnd);

        return TRUE;
    }

    return FALSE;
}



BOOL CALLBACK ModalDialogProc(HWND hwnd,
                              UINT msg,
                              WPARAM wParam,
                              LPARAM lParam)
{
    switch(msg)
    {

    case WM_INITDIALOG:

        SetDlgItemText(
            hwnd,
            IDC_STATIC1,
            TEXT("A simple demonstration of a modal dialog window."));

        return TRUE;


    case WM_CLOSE:

        EndDialog(hwnd,0);

        return TRUE;
    }

    return FALSE;
}



void CreateModelessDialogBox(HWND hwnd)
{
    HINSTANCE hInst = GetModuleHandle(NULL);

    HWND hDlg = CreateDialog(
        hInst,
        MAKEINTRESOURCE(IDD_MODELESS),
        hwnd,
        ModelessDialogProc);

    ShowWindow(hDlg,SW_SHOW);
}



void CreateModalDialogBox(HWND hwnd)
{
    HINSTANCE hInst = GetModuleHandle(NULL);

    DialogBox(
        hInst,
        MAKEINTRESOURCE(IDD_MODAL),
        hwnd,
        ModalDialogProc);
}