＋设为首页 ＋添加到收藏夹
这是一个返回文件夹路径的程序.因为实在看不懂程序到底是什么意思。
void CXianlu::OnButton2()
{
// TODO: Add your control notification handler code here
char direct[MAX_PATH];
LPMALLOC pMalloc;
~~~~~~~~~~~~~~~~~~?这句话什么意思?
char pszBuffer[MAX_PATH];
//Gets the Shells default allocator
if (::SHGetMalloc(&pMalloc) == NOERROR)
~~~~~~~~~~~~~~~这个是什么意思了?
{
BROWSEINFO bi;
// char pszBuffer[MAX_PATH];
LPITEMIDLIST pidl;
//Get help on BROWSEINFO struct - its got all
//the bit settings.
bi.hwndOwner = GetSafeHwnd();
bi.pidlRoot = NULL;
bi.pszDisplayName = pszBuffer;
strcpy(direct,"C:");
strcpy(direct,"\\");
strcpy(direct,"My Documents");
bi.lpszTitle = _T(direct);//Select a Starting Directory
bi.ulFlags = BIF_RETURNFSANCESTORS | BIF_RETURNONLYFSDIRS;
bi.lpfn = NULL;
bi.lParam = 0;
// This next call issues the dialog box.
if ((pidl = ::SHBrowseForFolder(&bi)) != NULL)
{
if (::SHGetPathFromIDList(pidl, pszBuffer))
{
// At this point pszBuffer contains the selected path
SetDlgItemText(IDC_EDIT4,pszBuffer);
}
// Free the PIDL allocated by SHBrowseForFolder.
pMalloc->Free(pidl);
}
// Release the shells allocator.
pMalloc->Release();
}
}
越具体越好，如果觉得分数不够,还可以再给分.只是我的分数不多，才900分.
等待着大侠的回答.
好象是取得IMalloc接口的，但不知为什么他这里要搞这么复杂，你把其中有关pMalloc变量的语句注释掉应该可以正常运行。
LPMALLOC pMalloc; pMalloc是一个指向IMalloc接口的指针，这个接口是用来分配或释放内存的(就是用来释放LPITEMIDLIST pidl，如果注释的话，pidl的资源将留在内存中)
SHGetMalloc(&pMalloc)用来获取IMalloc接口，因为函数的参数是指针的指针，所以加上了“&”，函数如果成功就返回NOERROR
关于释放pidl的问题 可以开一个内存检测的工具看一下就可以发现了
SDK 确实麻烦！
你从中学到了什么？？
IMalloc接口在这里专门负责释放用来保存资源信息的内存块
pMalloc->Free(pidl);//释放保存的资源信息
pMalloc->Release();//释放自己，因为这个是接口指针，如果不清楚可以看一下COM方面的资料
其它的就在MSDN上有，给你贴一下吧
BROWSEINFO
typedef struct _browseinfo {
HWND hwndOwner;
LPCITEMIDLIST pidlRoot;
LPSTR pszDisplayName;
LPCSTR lpszTitle;
UINT ulFlags;
BFFCALLBACK lpfn;
LPARAM lParam;
int iImage;
} BROWSEINFO, *PBROWSEINFO, *LPBROWSEINFO;
Contains parameters for the SHBrowseForFolder function and receives information about the folder selected by the user.
hwndOwner
Handle to the owner window for the dialog box.
pidlRoot
Address of an ITEMIDLIST structure specifying the location of the root folder from which to browse. Only the specified folder and its subfolders appear in the dialog box. This member can be NULL; in that case, the namespace root (the desktop folder) is used.
pszDisplayName
Address of a buffer to receive the display name of the folder selected by the user. The size of this buffer is assumed to be MAX_PATH bytes.
lpszTitle
Address of a null-terminated string that is displayed above the tree view control in the dialog box. This string can be used to specify instructions to the user.
ulFlags
Flags specifying the options for the dialog box. This member can include zero or a combination of the following values: BIF_BROWSEFORCOMPUTER Only return computers. If the user selects anything other than a computer, the OK button is grayed.
BIF_BROWSEFORPRINTER Only return printers. If the user selects anything other than a printer, the OK button is grayed.
BIF_BROWSEINCLUDEFILES The browse dialog will display files as well as folders.
BIF_DONTGOBELOWDOMAIN Do not include network folders below the domain level in the tree view control.
BIF_EDITBOX Version 4.71. The browse dialog includes an edit control in which the user can type the name of an item.
BIF_RETURNFSANCESTORS Only return file system ancestors. If the user selects anything other than a file system ancestor, the OK button is grayed.
BIF_RETURNONLYFSDIRS Only return file system directories. If the user selects folders that are not part of the file system, the OK button is grayed.
BIF_STATUSTEXT Include a status area in the dialog box. The callback function can set the status text by sending messages to the dialog box.
BIF_VALIDATE Version 4.71. If the user types an invalid name into the edit box, the browse dialog will call the applications BrowseCallbackProc with the BFFM_VALIDATEFAILED message. This flag is ignored if BIF_EDITBOX is not specified.
lpfn
Address of an application-defined function that the dialog box calls when an event occurs. For more information, see the BrowseCallbackProc function. This member can be NULL.
lParam
Application-defined value that the dialog box passes to the callback function, if one is specified.
iImage
Variable to receive the image associated with the selected folder. The image is specified as an index to the system image list.
ITEMIDLIST
typedef struct _ITEMIDLIST {
SHITEMID mkid;
} ITEMIDLIST, * LPITEMIDLIST;
typedef const ITEMIDLIST * LPCITEMIDLIST;
Contains a list of item identifiers.
mkid
List of item identifiers.
