学步园

有时我们需要获得某个文件夹的路径，而不是文件的路径，这时需要用API函数SHBrowseForFolder来实现。

函数原型为:

LPITEMIDLIST SHBrowseForFolder(LPBROWSEINFO lpbi);

其中LPBROWSEINFO为BROWSEINFO结构的指针。

BROWSEINFO结构如下:

typedef struct _browseinfo {

HWND hwndOwner;
LPCITEMIDLIST pidlRoot;
LPSTR pszDisplayName;
LPCSTR lpszTitle;
UINT ulFlags;
BFFCALLBACK lpfn;
LPARAM lParam;
int iImage;

} BROWSEINFO;

调用例子如下：

void CMakemifDlg::OnRecPcpath()
{
CString sFolderPath;
BROWSEINFO bi;
char Buffer[MAX_PATH];
//初始化入口参数bi开始
bi.hwndOwner = NULL;
bi.pidlRoot = NULL;
bi.pszDisplayName = Buffer;//此参数如为NULL则不能显示对话框
bi.lpszTitle = "修改接收路径";
bi.ulFlags = 0;
bi.lpfn = NULL;
bi.iImage=IDI_ICON2;
//初始化入口参数bi结束
LPITEMIDLIST pIDList = SHBrowseForFolder(&bi);//调用显示选择对话框
if(pIDList)
{
SHGetPathFromIDList(pIDList, Buffer);
//取得文件夹路径到Buffer里
sFolderPath = Buffer;//将路径保存在一个CString对象里
}
LPMALLOC lpMalloc;
if(FAILED(SHGetMalloc(&lpMalloc))) return;
//释放内存
lpMalloc->Free(pIDList);
lpMalloc->Release();
}

===================================================================================

Another Example:

VC中没有现成的函数来选择一个文件夹，但这是经常会用到的，怎么办？
自动动手，丰衣足食！

使用SHBrowseForFolder，代码如下：

#include <Shlobj.h>
  
int SelFolder(HWND hParent, CString &strFolder)
{
    strFolder.Empty();
 
    LPMALLOC lpMalloc;
 
    if (::SHGetMalloc(&lpMalloc) != NOERROR) return 0;
 
    char szDisplayName[_MAX_PATH];
    char szBuffer[_MAX_PATH];
    BROWSEINFO browseInfo;
    browseInfo.hwndOwner = hParent;
    browseInfo.pidlRoot = NULL; // set root at Desktop
    browseInfo.pszDisplayName = szDisplayName;
    browseInfo.lpszTitle = "Select a folder";
    browseInfo.ulFlags = BIF_RETURNFSANCESTORS|BIF_RETURNONLYFSDIRS;
    browseInfo.lpfn = NULL;
    browseInfo.lParam = 0;
 
    LPITEMIDLIST lpItemIDList;
    if ((lpItemIDList = ::SHBrowseForFolder(&browseInfo)) != NULL)
    {
        // Get the path of the selected folder from the    item ID list.
        if (::SHGetPathFromIDList(lpItemIDList, szBuffer))
        {
            // At this point, szBuffer contains the path the user chose.
            if (szBuffer[0] == ''''/0'''') return 0;
 
            // We have a path in szBuffer! Return it.
            strFolder = szBuffer;
            return 1;
        }
        else return 1; // strResult is empty
 
        lpMalloc->Free(lpItemIDList);
        lpMalloc->Release();
    }