// Allows a client to specify which individual items should be enumerated.
// Note: The host calls this method for each item in the folder. Return S_OK, to have the item enumerated.
// Return S_FALSE to prevent the item from being enumerated.
public Int32 ShouldShow(
Object psf, // A pointer to the folder's IShellFolder interface.
IntPtr pidlFolder, // The folder's PIDL.
IntPtr pidlItem) // The item's PIDL.
{
// check extension, and if not ok return 1 (S_FALSE)
// get display name of item
IShellFolder isf = (IShellFolder)psf;
ShellApi.STRRET ptrDisplayName;
isf.GetDisplayNameOf(pidlItem, (uint)ShellApi.SHGNO.SHGDN_NORMAL | (uint)ShellApi.SHGNO.SHGDN_FORPARSING, out ptrDisplayName);
String sDisplay;
ShellApi.StrRetToBSTR(ref ptrDisplayName, (IntPtr)0, out sDisplay);
// check if item is file or folder
IntPtr[] aPidl = new IntPtr[1];
aPidl[0] = pidlItem;
uint Attrib;
Attrib = (uint)ShellApi.SFGAO.SFGAO_FOLDER;
int temp;
temp = isf.GetAttributesOf(1, aPidl, ref Attrib);
// if item is a folder, accept
if ((Attrib & (uint)ShellApi.SFGAO.SFGAO_FOLDER) == (uint)ShellApi.SFGAO.SFGAO_FOLDER)
{
return(0);
}
// if item is file, check if it has a valid extension
for (int i = 0; i < ValidExtension.Length; i++)
{
if (sDisplay.ToUpper().EndsWith("." + ValidExtension[i].ToUpper()))
{
return(0);
}
}
return(1);
}
public void ShowDialog()
{
m_FullName = "";
m_DisplayName = "";
// Get shell's memory allocator, it is needed to free some memory later
IMalloc pMalloc;
pMalloc = ShellFunctions.GetMalloc();
IntPtr pidlRoot;
if (RootType == RootTypeOptions.BySpecialFolder)
{
ShellApi.SHGetFolderLocation(hwndOwner, (int)RootSpecialFolder, UserToken, 0, out pidlRoot);
}
else // m_RootType = RootTypeOptions.ByPath
{
uint iAttribute;
ShellApi.SHParseDisplayName(RootPath, IntPtr.Zero, out pidlRoot, 0, out iAttribute);
}
ShellApi.BROWSEINFO bi = new ShellApi.BROWSEINFO();
bi.hwndOwner = hwndOwner;
bi.pidlRoot = pidlRoot;
bi.pszDisplayName = new String(' ', 256);
bi.lpszTitle = Title;
bi.ulFlags = (uint)DetailsFlags;
bi.lParam = 0;
bi.lpfn = new ShellApi.BrowseCallbackProc(this.myBrowseCallbackProc);
// Show dialog
IntPtr pidlSelected;
pidlSelected = ShellApi.SHBrowseForFolder(ref bi);
// Save the display name
m_DisplayName = bi.pszDisplayName.ToString();
IShellFolder isf = ShellFunctions.GetDesktopFolder();
ShellApi.STRRET ptrDisplayName;
isf.GetDisplayNameOf(pidlSelected, (uint)ShellApi.SHGNO.SHGDN_NORMAL | (uint)ShellApi.SHGNO.SHGDN_FORPARSING, out ptrDisplayName);
String sDisplay;
ShellApi.StrRetToBSTR(ref ptrDisplayName, pidlRoot, out sDisplay);
m_FullName = sDisplay;
if (pidlRoot != IntPtr.Zero)
{
pMalloc.Free(pidlRoot);
}
if (pidlSelected != IntPtr.Zero)
{
pMalloc.Free(pidlSelected);
}
Marshal.ReleaseComObject(isf);
Marshal.ReleaseComObject(pMalloc);
}
