浏览文件窗口中指定默认目录

最新推荐文章于 2025-04-16 16:15:28 发布

原创最新推荐文章于 2025-04-16 16:15:28 发布 · 940 阅读

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CC 4.0 BY-SA版权

文章标签：

#path #callback #parameters #function #buffer #dialog

本文介绍了一个文件选择器对话框的实现方法，通过使用Windows API函数SHBrowseForFolder展示一个允许用户从所有可用本地驱动器和网络资源中选择文件夹的对话框。

int CALLBACK BrowseCallbackProc(HWND hwnd,
                                             UINT uMsg,
                                             LPARAM lParam,
                                             LPARAM lpData
                                             )
{
char szPath[MAX_PATH];

switch(uMsg)
{
  case BFFM_INITIALIZED:
   SendMessage(hwnd, BFFM_SETSELECTION, TRUE, lpData);
   break;

  case BFFM_SELCHANGED:
   if (SHGetPathFromIDList((LPITEMIDLIST) lParam ,szPath))
   {
    SendMessage(hwnd, BFFM_SETSTATUSTEXT,0,(LPARAM)szPath);

}
break;
}

// if((uMsg & BFFM_INITIALIZED) == BFFM_INITIALIZED)
// {
//SendMessage(hwnd, BFFM_SETSELECTION, TRUE, lpData);
// }
return 0;

}

void CSystemParam::OnBnClickedBtnPathBrowse()
{
//ITEMIDLIST *ppidl;
//SHGetSpecialFolderLocation(NULL, CSIDL_DESKTOP ,&ppidl);
//if ( ppidl == NULL)
//{
// AfxMessageBox(_T("启动路径浏览失败") ) ;
// return;
//}

BROWSEINFO bi;
memset(&bi,0,sizeof(BROWSEINFO));
    bi.lpszTitle = _T("请选择一个数据文件保存文件");
bi.lpfn = BrowseCallbackProc;
bi.lParam = (LPARAM)(LPCTSTR)m_sFileSavePath;
bi.ulFlags = BIF_RETURNONLYFSDIRS /*| BIF_EDITBOX*/ | BIF_STATUSTEXT /*| BIF_NEWDIALOGSTYLE*/;
    LPITEMIDLIST pidl = SHBrowseForFolder ( &bi );
    if ( pidl != 0 )
    {
        // get the name of the folder
        TCHAR path[MAX_PATH];
        if ( SHGetPathFromIDList ( pidl, path ) )
        {
   m_sFileSavePath.Format(_T("%s"),path);
   if(m_sFileSavePath.GetAt(m_sFileSavePath.GetLength()-1)!=_T('//'))
    m_sFileSavePath.AppendChar(_T('//'));
   UpdateData(FALSE);
        }

        // free memory used
        IMalloc * imalloc = 0;
        if ( SUCCEEDED( SHGetMalloc ( &imalloc )) )
        {
            imalloc->Free ( pidl );
            imalloc->Release ( );
        }
    }
}

参考资料：

The ''Browse For Folder'' dialog allows the user to select a folder from all available local drives and network resources.
The following code snippet demonstrate how to display this dialog-box. The BrowseFolders function accept 3 parameters:
hwnd - The handle of the parent window
lpszFolder - Address of a buffer to receive the selected folder. Before calling this function, you should fill this buffer with the folder that you want to be selected when the dialog-box is loaded at first.
lpszTitle - The text that should be displayed as a title of the ''Browse Folders'' dialog-box

Return back to C/C++ code index

#include <windows.h>
#include <shlobj.h>

int CALLBACK BrowseForFolderCallback(HWND hwnd,UINT uMsg,LPARAM lp, LPARAM pData)
{
char szPath[MAX_PATH];

switch(uMsg)
{
  case BFFM_INITIALIZED:
   SendMessage(hwnd, BFFM_SETSELECTION, TRUE, pData);
   break;

  case BFFM_SELCHANGED:
   if (SHGetPathFromIDList((LPITEMIDLIST) lp ,szPath))
   {
    SendMessage(hwnd, BFFM_SETSTATUSTEXT,0,(LPARAM)szPath);

}
break;
}

return 0;
}

BOOL BrowseFolders(HWND hwnd, LPSTR lpszFolder, LPSTR lpszTitle)
{
BROWSEINFO bi;
char szPath[MAX_PATH + 1];
LPITEMIDLIST pidl;
BOOL bResult = FALSE;

LPMALLOC pMalloc;

    if (SUCCEEDED(SHGetMalloc(&pMalloc)))
{
  bi.hwndOwner = hwnd;
  bi.pidlRoot = NULL;
  bi.pszDisplayName = NULL;
  bi.lpszTitle = lpszTitle;
  bi.ulFlags = BIF_STATUSTEXT; //BIF_EDITBOX
  bi.lpfn = BrowseForFolderCallback;
  bi.lParam = (LPARAM)lpszFolder;

  pidl = SHBrowseForFolder(&bi);
  if (pidl)
  {
   if (SHGetPathFromIDList(pidl,szPath))
   {
    bResult = TRUE;
    strcpy(lpszFolder, szPath);
   }