// Allows a client to specify which classes of objects in a Shell folder should be enumerated.
public Int32 GetEnumFlags(
Object psf, // A pointer to the folder's IShellFolder interface.
IntPtr pidlFolder, // The folder's PIDL.
IntPtr phwnd, // A pointer to the host's window handle.
out UInt32 pgrfFlags) // One or more SHCONTF values that specify which classes of objects to enumerate.
{
// get display name of item
ShellLib.IShellFolder isf = (ShellLib.IShellFolder)psf;
ShellLib.ShellApi.STRRET ptrDisplayName;
isf.GetDisplayNameOf(pidlFolder, (uint)ShellLib.ShellApi.SHGNO.SHGDN_NORMAL | (uint)ShellLib.ShellApi.SHGNO.SHGDN_FORPARSING, out ptrDisplayName);
String sDisplay;
ShellLib.ShellApi.StrRetToBSTR(ref ptrDisplayName, (IntPtr)0, out sDisplay);
if (sDisplay != null && DontExpandZip && sDisplay.ToUpper().EndsWith(".ZIP"))
{
pgrfFlags = 0; // show nothing
}
else
{
pgrfFlags = (uint)ShellApi.SHCONTF.SHCONTF_FOLDERS | (uint)ShellApi.SHCONTF.SHCONTF_NONFOLDERS;
}
return(0);
}
// 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
ShellLib.IShellFolder isf = (ShellLib.IShellFolder)psf;
ShellLib.ShellApi.STRRET ptrDisplayName;
isf.GetDisplayNameOf(pidlItem, (uint)ShellLib.ShellApi.SHGNO.SHGDN_NORMAL | (uint)ShellLib.ShellApi.SHGNO.SHGDN_FORPARSING, out ptrDisplayName);
String sDisplay;
ShellLib.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)ShellLib.ShellApi.SFGAO.SFGAO_FOLDER;
int temp;
temp = isf.GetAttributesOf(1, aPidl, ref Attrib);
// if item is a folder, accept
if ((Attrib & (uint)ShellLib.ShellApi.SFGAO.SFGAO_FOLDER) == (uint)ShellLib.ShellApi.SFGAO.SFGAO_FOLDER)
{
return(0);
}
// if item is file, check if it has a valid extension
for (int i = 0; i < ValidExtensions.Length; i++)
{
if (sDisplay.ToUpper().EndsWith("." + ValidExtensions[i].ToUpper()))
{
return(0);
}
}
return(1);
}