C语言中打开文件选择

#include<commdlg.h>

OPENFILENAME ofn;
char szFile[MAX_PATH];
ZeroMemory(&ofn,sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.lpstrFile = szFile;
ofn.lpstrFile[0] = TEXT('\0');
ofn.nMaxFile = sizeof(szFile);
ofn.lpstrFilter = TEXT("ALL\0*.*\0Text\0*.TXT\0");
ofn.nFilterIndex = 1;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;

ofn.hwndOwner = hwnd;
ofn.Flags = OFN_EXPLORER |OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
if(GetOpenFileName(&ofn))
{
    MessageBox(NULL,szFile,"",MB_OK);
}