C++ 打開選擇文件夾對話框選擇目錄的操作

#ifdef WIN32
#include <shlobj.h>
#endif

// 選擇目錄
void CustomInstalWndViewCtrl::OnSigBtnSelectInstallDir()
{
 BROWSEINFO bi;
 bi.hwndOwner = NULL;
 bi.pidlRoot = CSIDL_DESKTOP;//文件夾的根目錄，此處為桌面
 bi.pszDisplayName = NULL;
 bi.lpszTitle = NULL;//顯示位於對話框左上部的提示信息
 bi.ulFlags = BIF_DONTGOBELOWDOMAIN | BIF_RETURNONLYFSDIRS | BIF_NEWDIALOGSTYLE;//有新建文件夾按鈕
 bi.lpfn = NULL;
 bi.iImage = 0;
 LPITEMIDLIST pidl = SHBrowseForFolder(&bi);//調用選擇對話框
 if (pidl == NULL)
 {
 std::cout << "沒有選擇目錄" << std::endl;
 return;
 }
 TCHAR strFolder[MAX_PATH];
 SHGetPathFromIDList(pidl, strFolder);
 std::string sFolder = StringUtil::WStringToString(strFolder);
}

void openDir(){
 //選擇文件夾 
 string _Path,root;
 TCHAR szDir[MAX_PATH];
 BROWSEINFO bi;
 ITEMIDLIST *pidl;
 bi.hwndOwner = this->m_hWnd;
 bi.pidlRoot = NULL;
 bi.pszDisplayName = szDir;//這個是輸出緩沖區 
 bi.lpszTitle = _T("文件夾："); //標題 
 bi.ulFlags = BIF_NEWDIALOGSTYLE;//使用新的界面,在win7中效果較好//BIF_RETURNONLYFSDIRS; 
 bi.lpfn = NULL;
 bi.lParam = 0;
 bi.iImage = 0;
 pidl = SHBrowseForFolder(&bi);//彈出對話框 
 if (pidl == NULL)//點瞭取消，或者選擇瞭無效的文件夾則返回NULL 
 return;
 
 if (SHGetPathFromIDList(pidl, szDir)) {
 int length = WideCharToMultiByte(CP_ACP, 0, szDir, -1, NULL, 0, NULL, NULL);
 char ch[] = "";
 WideCharToMultiByte(CP_ACP, 0, szDir, -1, ch, length, NULL, NULL);
 root = string(ch);
 } 
}