使用 OPENFILENAME 以及 GetOpenFileName、GetSaveFileName 实现打开，保存对话框

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(1) 建立全局变量
  OPENFILENAME ofn;
(2) 初始化部分结构体
      //------初始化OPENFILENAME结构成员-----Start-----
      ofn.lStructSize = sizeof(OPENFILENAME);
      ofn.hwndOwner = hDlg;
      ofn.hInstance = hInst;
      ofn.lpstrFilter = "Text File(*.TXT)/0*.txt/0All File(*.*)/0*.*/0";
      ofn.lpstrCustomFilter = NULL;
      ofn.nMaxCustFilter = 0;
      ofn.nFilterIndex = 1;
      //ofn.lpstrFile = NULL;
      ofn.nMaxFile = MAX_PATH; //设置 lpstrFile 位的缓冲区大小，如果为 0，则不返回文件路径
      ofn.lpstrFileTitle=NULL;
      ofn.nMaxFileTitle = 0;
      ofn.lpstrInitialDir = NULL;
      ofn.lpstrTitle = NULL;
      ofn.Flags = 0;
      ofn.nFileOffset = 0;
      ofn.nFileExtension = 0;
      ofn.lpstrDefExt = "txt";//NULL;
      ofn.lCustData = 0;
      ofn.lpfnHook = NULL;
      ofn.lpTemplateName = NULL;
    //------初始化OPENFILENAME结构成员-----End--------
(3)调用打开
//------------打开文件对话框----------
char sFileDef[MAX_PATH];// = "abcd.txt";
BOOL bRet = FALSE;

ofn.lpstrFile = sFileDef;
// ofn.lpstrFile[0] = '/0';  //设置为 '/0' 则录入框没默认值
ofn.Flags = OFN_FILEMUSTEXIST|OFN_HIDEREADONLY|OFN_PATHMUSTEXIST; //OFN_FILEMUSTEXIST|
ofn.lpstrTitle = "打开";
bRet = GetOpenFileName(&ofn);

if (bRet)
{
MessageBox(0, ofn.lpstrFile, "FILE", 0);
SetDlgItemText(hDlg, ID_ED_SELTFILE, ofn.lpstrFile);
}

//------------保存文件对话框----------
char sFileDef[MAX_PATH];// = "abcd.txt";
BOOL bRet = FALSE;

ofn.lpstrFile = sFileDef;
// ofn.lpstrFile[0] = '/0'; //设置为 '/0' 则录入框没默认值
ofn.Flags = OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST|OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT;
ofn.lpstrTitle="另存为...";
bRet = GetSaveFileName(&ofn);
//------OpenSaveDialog------End--------

if (bRet)
{
MessageBox(0, ofn.lpstrFile, "FILE", 0);
SetDlgItemText(hDlg, ID_ED_SELTFILE, ofn.lpstrFile);
}
(4)返回路径保存在 ofn.lpstrFile 变量中