모달 다이얼로그 (modal dialog)

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
LPSTR lpszClass="Mless";
int x;
int y;
char str[128];
HWND hDlg;
HWND hWndMain;

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
         ,LPSTR lpszCmdParam,int nCmdShow)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;
    g_hInst=hInstance;
    
    WndClass.cbClsExtra=0;
    WndClass.cbWndExtra=0;
    WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
    WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    WndClass.hInstance=hInstance;
    WndClass.lpfnWndProc=(WNDPROC)WndProc;
    WndClass.lpszClassName=lpszClass;
    WndClass.lpszMenuName=NULL;
    WndClass.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&WndClass);

    hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
        NULL,(HMENU)NULL,hInstance,NULL);
    ShowWindow(hWnd,nCmdShow);
    hWndMain=hWnd;
    
    while(GetMessage(&Message,0,0,0)) {
        if (!IsWindow(hDlg) || !IsDialogMessage(hDlg,&Message)) {
            TranslateMessage(&Message);
            DispatchMessage(&Message);
        }
    }
    return Message.wParam;
}

#include "resource.h"
BOOL CALLBACK MlessDlgProc(HWND hDlg,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    switch(iMessage) {
    case WM_INITDIALOG:
        SetDlgItemText(hDlg,IDC_STR,str);
        SetDlgItemInt(hDlg,IDC_X,x,FALSE);
        SetDlgItemInt(hDlg,IDC_Y,y,FALSE);
        return TRUE;
    case WM_COMMAND:
        switch (wParam) {
        case ID_CHANGE:
            GetDlgItemText(hDlg,IDC_STR,str,128);
            x=GetDlgItemInt(hDlg,IDC_X,NULL,FALSE);
            y=GetDlgItemInt(hDlg,IDC_Y,NULL,FALSE);
            InvalidateRect(hWndMain,NULL,TRUE);
            return TRUE;
        case ID_CLOSE:
            DestroyWindow(hDlg);
            hDlg=NULL;
            return TRUE;
        }
        break;
    }
return FALSE;
}


LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    switch(iMessage) {
    case WM_CREATE:
        x=100;
        y=100;
        strcpy(str,"String");
        return 0;
    case WM_PAINT:
        hdc=BeginPaint(hWnd, &ps);
        TextOut(hdc,x,y,str,strlen(str));
        EndPaint(hWnd, &ps);
        return 0;
    case WM_LBUTTONDOWN:
        if (!IsWindow(hDlg)) {
            hDlg=CreateDialog(g_hInst,MAKEINTRESOURCE(IDD_DIALOG1),
                hWnd,MlessDlgProc);
            ShowWindow(hDlg,SW_SHOW);
        }
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}