from http://www.cnblogs.com/Clingingboy/archive/2011/04/16/2018284.html

一.首先要为SHBrowseForFolder准备一个结构体BROWSEINFO

typedef struct _browseinfoW {
HWND hwndOwner;
PCIDLIST_ABSOLUTE pidlRoot;
LPWSTR pszDisplayName; // Return display name of item selected.
LPCWSTR lpszTitle; // text to go in the banner over the tree.
UINT ulFlags; // Flags that control the return stuff
BFFCALLBACK lpfn;
LPARAM lParam; // extra info that's passed back in callbacks
int iImage; // output var: where to return the Image index.
} BROWSEINFOW, *PBROWSEINFOW, *LPBROWSEINFOW;

二.获取PIDL

在BROWSEINFOW结构体中,pidlRoot是最关键的,需要调用一些额外的函数来获取PIDL,然后给pidlRoot赋值

1.获取特殊的目录地址

在Windows中有很多特殊的的目录地址,如我的电脑,控件面板,我的图片等,如下定义

#define CSIDL_DESKTOP 0x0000 //
#define CSIDL_INTERNET 0x0001 // Internet Explorer (icon on desktop)
#define CSIDL_PROGRAMS 0x0002 // Start Menu\Programs
#define CSIDL_CONTROLS 0x0003 // My Computer\Control Panel
#define CSIDL_PRINTERS 0x0004 // My Computer\Printers
#define CSIDL_PERSONAL 0x0005 // My Documents
#define CSIDL_FAVORITES 0x0006 // \Favorites
#define CSIDL_STARTUP 0x0007 // Start Menu\Programs\Startup
#define CSIDL_RECENT 0x0008 // \Recent

我们可以通过SHGetSpecialFolderLocation来填充一个LPITEMIDLIST,

BROWSEINFO bi;
bi.hwndOwner = hDlg;
TCHAR szTitle[MAX_PATH] = {0};
TCHAR szPath[MAX_PATH] = {0};
TCHAR szDisplay[MAX_PATH] = {0};
LPITEMIDLIST pidl = NULL;
SHGetSpecialFolderLocation(NULL, CSIDL_DESKTOP, &pidl);
bi.pidlRoot = pidl;

然后调用SHBrowseForFolder(&bi);就可以出现以下对话框

2.使用IShellFolder获取目录地址

如果不是特殊目录的，可以使用IShellFolder的ParseDisplayName方法,来获取PIDL

首先要调用SHGetDesktopFolder函数来获取IShellFolder,ShellFolder代表桌面,表示是根目录,根目录总是有办法找到任意一个子目录的 
然后调用ParseDisplayName方法来解析目录,最终得到LPITEMIDLIST。 
下面的步骤还是一样把LPITEMIDLIST填充到BROWSEINFO的pidlRoot 字段,调用SHBrowseForFolder方法

SHParseDisplayName方法提供了一个便利

HRESULT SHPathToPIDL(LPCTSTR szPath, LPITEMIDLIST* ppidl)
{
LPSHELLFOLDER pShellFolder = NULL;
OLECHAR wszPath[MAX_PATH] = {0};
ULONG nCharsParsed = 0;

// Get an IShellFolder interface pointer
HRESULT hr = SHGetDesktopFolder(&pShellFolder);
if(FAILED(hr))
return hr;

// Convert the path name to Unicode
MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, szPath, -1, wszPath, MAX_PATH);

// Call ParseDisplayName() to do the job
hr = pShellFolder->ParseDisplayName(NULL, NULL, wszPath, &nCharsParsed, ppidl, NULL);

// Clean up
pShellFolder->Release();
return hr;
}

3.获取选择的目录

当选中目录点击确定之后，就需要获取一个文件系统路径,可以使用SHGetPathFromIDList函数

SHGetPathFromIDList(pidlFolder, szPath);

szPath就是我们想要的结果

4.BROWSEINFO的回调方法

在.net中会声明很多的事件,若Initialized,SelectedChanged等,c++是采用消息的机制,根据消息的不同进行不同处理,当然这些消息都是预先定义好的.

#define BFFM_INITIALIZED 1
#define BFFM_SELCHANGED 2
#define BFFM_VALIDATEFAILEDA 3 // lParam:szPath ret:1(cont),0(EndDialog)
#define BFFM_VALIDATEFAILEDW 4 // lParam:wzPath ret:1(cont),0(EndDialog)
#define BFFM_IUNKNOWN 5 // provides IUnknown to client. lParam: IUnknown*

示例如下:

bi.lpfn = BrowseCallbackProc;

int CALLBACK BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM dwData)
{
switch(uMsg)
{
case BFFM_INITIALIZED:
{

  }  
  break;

case BFFM_SELCHANGED:
{

  }  
  break;

case BFFM_VALIDATEFAILED:

  return 1;  

}

return 0;
}

三.文件夹选项

如下图,应该是很熟悉

SHGetSettings函数可以获取这些选项的信息,存在结构体SHELLFLAGSTATE当中

typedef struct {
BOOL fShowAllObjects : 1;
BOOL fShowExtensions : 1;
BOOL fNoConfirmRecycle : 1;
BOOL fShowSysFiles : 1;
BOOL fShowCompColor : 1;
BOOL fDoubleClickInWebView : 1;
BOOL fDesktopHTML : 1;
BOOL fWin95Classic : 1;
BOOL fDontPrettyPath : 1;
BOOL fShowAttribCol : 1;
BOOL fMapNetDrvBtn : 1;
BOOL fShowInfoTip : 1;
BOOL fHideIcons : 1;
#if (NTDDI_VERSION >= NTDDI_VISTA)
BOOL fAutoCheckSelect: 1;
BOOL fIconsOnly: 1;
UINT fRestFlags : 1; // when adding additional flags keep SHELLSTATE and SHGetSettings in sync.

#else
UINT fRestFlags : 3; // when adding additional flags keep SHELLSTATE and SHGetSettings in sync.
#endif
} SHELLFLAGSTATE, *LPSHELLFLAGSTATE;

必须输入想要获取标识才行,不然就会是默认值(难道是为了性能,为何如此，太麻烦)

SHELLFLAGSTATE sfs;
SHGetSettings(&sfs, SSF_DESKTOPHTML | SSF_SHOWALLOBJECTS |
SSF_MAPNETDRVBUTTON | SSF_SHOWATTRIBCOL | SSF_SHOWEXTENSIONS);