다이얼 로그 박스에 변수 전달하기 (DialogBoxParam)

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
HWND hWndMain;
LPSTR lpszClass="DlgParam";

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)) {
        TranslateMessage(&Message);
        DispatchMessage(&Message);
    }
    return Message.wParam;
}

#include "resource.h"
BOOL CALLBACK DlgProc(HWND hDlg,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    static char *Param;
    switch(iMessage) {
    case WM_INITDIALOG:
        Param=(char *)lParam;
        SetDlgItemText(hDlg,IDC_STATIC1,Param);
        return TRUE;
    case WM_COMMAND:
        switch (wParam) {
        case IDOK:
            EndDialog(hDlg,1);
            return TRUE;
        case IDCANCEL:
            EndDialog(hDlg,0);
            return TRUE;
        }
        break;
    }
    return FALSE;
}


LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    char Mes[128]="마우스 왼쪽 버튼을 누르면 대화상자가 호출됩니다";

    switch(iMessage) {
    case WM_CREATE:
        return 0;
    case WM_LBUTTONDOWN:
        DialogBoxParam(g_hInst, MAKEINTRESOURCE(IDD_DIALOG1),
            hWnd,DlgProc,(LPARAM)"읽을 파일을 입력해 주십시오.");
        return TRUE;
    case WM_RBUTTONDOWN:
        DialogBoxParam(g_hInst, MAKEINTRESOURCE(IDD_DIALOG1),
            hWnd,DlgProc,(LPARAM)"저장할 파일명을 입력해 주십시오.");
        return TRUE;
    case WM_PAINT:
        hdc=BeginPaint(hWnd, &ps);
        TextOut(hdc,50,50,Mes,strlen(Mes));
        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}