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 // <desktop> #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 // <user name>\Favorites #define CSIDL_STARTUP 0x0007 // Start Menu\Programs\Startup #define CSIDL_RECENT 0x0008 // <user name>\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);