C++ 打开选择文件夹对话框选择目录的操作

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

// 选择目录
void CustomInstalWndViewCtrl::OnSigBtnSelectInstallDir()
{
 BROWSEINFO bi;
 bi.hwndOwner = NULL;
 bi.pidlRoot = CSIDL_DESKTOP;//文件夹的根目录，此处为桌面
 bi.pszDisplayName = NULL;
 bi.lpszTitle = NULL;//显示位于对话框左上部的提示信息
 bi.ulFlags = BIF_DONTGOBELOWDOMAIN | BIF_RETURNONLYFSDIRS | BIF_NEWDIALOGSTYLE;//有新建文件夹按钮
 bi.lpfn = NULL;
 bi.iImage = 0;
 LPITEMIDLIST pidl = SHBrowseForFolder(&bi);//调用选择对话框
 if (pidl == NULL)
 {
 std::cout << "没有选择目录" << std::endl;
 return;
 }
 TCHAR strFolder[MAX_PATH];
 SHGetPathFromIDList(pidl, strFolder);
 std::string sFolder = StringUtil::WStringToString(strFolder);
}

void openDir(){
 //选择文件夹 
 string _Path,root;
 TCHAR szDir[MAX_PATH];
 BROWSEINFO bi;
 ITEMIDLIST *pidl;
 bi.hwndOwner = this->m_hWnd;
 bi.pidlRoot = NULL;
 bi.pszDisplayName = szDir;//这个是输出缓冲区 
 bi.lpszTitle = _T("文件夹："); //标题 
 bi.ulFlags = BIF_NEWDIALOGSTYLE;//使用新的界面,在win7中效果较好//BIF_RETURNONLYFSDIRS; 
 bi.lpfn = NULL;
 bi.lParam = 0;
 bi.iImage = 0;
 pidl = SHBrowseForFolder(&bi);//弹出对话框 
 if (pidl == NULL)//点了取消，或者选择了无效的文件夹则返回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);
 } 
}