protected override bool RunDialog(IntPtr hwndOwner)
{
InteropUtil.Assume(Marshal.SystemDefaultCharSize == 2, "The character size should be 2");
IntPtr nativeBuffer = Marshal.AllocCoTaskMem(InteropUtil.NumberOfFileChars * 2);
IntPtr filterBuffer = IntPtr.Zero;
_selected = new List <string>();
try
{
var openFileName = new InteropUtil.OpenFileName();
openFileName.Initialize();
openFileName.hwndOwner = hwndOwner;
var chars = new char[InteropUtil.NumberOfFileChars];
try
{
if (File.Exists(Path))
{
if (AcceptFiles)
{
string fileName = System.IO.Path.GetFileName(Path);
int length = Math.Min(fileName.Length, InteropUtil.NumberOfFileChars);
fileName.CopyTo(0, chars, 0, length);
openFileName.lpstrInitialDir = System.IO.Path.GetDirectoryName(Path);
}
else
{
openFileName.lpstrInitialDir = System.IO.Path.GetDirectoryName(Path);
}
}
else if (Directory.Exists(Path))
{
openFileName.lpstrInitialDir = Path;
}
else
{
//the path does not exist.
//We don't just want to throw it away, however.
//The initial path we get is most likely provided by the user in some way.
//It could be what they typed into a text box before clicking a browse button,
//or it could be a value they had entered previously that used to be valid, but now no longer exists.
//In any case, we don't want to throw out the user's text. So, we find the first parent
//directory of Path that exists on disk.
//We will set the initial directory to that path, and then set the initial file to
//the rest of the path. The user will get an error if the click "OK"m saying that the selected path
//doesn't exist, but that's ok. If we didn't do this, and showed the path, if they clicked
//OK without making changes we would actually change the selected path, which would be bad.
//This way, if the users want's to change the folder, he actually has to change something.
string pathToShow;
InitializePathDNE(Path, out openFileName.lpstrInitialDir, out pathToShow);
pathToShow = pathToShow ?? String.Empty;
int length = Math.Min(pathToShow.Length, InteropUtil.NumberOfFileChars);
pathToShow.CopyTo(0, chars, 0, length);
}
}
catch
{
}
Marshal.Copy(chars, 0, nativeBuffer, chars.Length);
openFileName.lpstrFile = nativeBuffer;
if (!AcceptFiles)
{
string str = string.Format("Folders\0*.{0}-{1}\0\0", Guid.NewGuid().ToString("N"),
Guid.NewGuid().ToString("N"));
filterBuffer = openFileName.lpstrFilter = Marshal.StringToCoTaskMemUni(str);
}
else
{
openFileName.lpstrFilter = IntPtr.Zero;
}
openFileName.nMaxCustFilter = 0;
openFileName.nFilterIndex = 0;
openFileName.nMaxFile = InteropUtil.NumberOfFileChars;
openFileName.nMaxFileTitle = 0;
openFileName.lpstrTitle = Title;
openFileName.lpfnHook = m_hookDelegate;
openFileName.templateID = InteropUtil.IDD_CustomOpenDialog;
openFileName.hInstance = Marshal.GetHINSTANCE(typeof(SelectFileAndFolderDialog).Module);
openFileName.Flags =
InteropUtil.OFN_DONTADDTORECENT |
InteropUtil.OFN_ENABLEHOOK |
InteropUtil.OFN_ENABLESIZING |
InteropUtil.OFN_NOTESTFILECREATE |
InteropUtil.OFN_ALLOWMULTISELECT |
InteropUtil.OFN_EXPLORER |
InteropUtil.OFN_FILEMUSTEXIST |
InteropUtil.OFN_PATHMUSTEXIST |
InteropUtil.OFN_NODEREFERENCELINKS |
InteropUtil.OFN_ENABLETEMPLATE |
(ShowReadOnly ? 0 : InteropUtil.OFN_HIDEREADONLY);
m_useCurrentDir = false;
bool hideFileExtSettingChanged = false;
try
{
if (GetHideFileExtensionSetting())
{
HideFileExtension(false);
hideFileExtSettingChanged = true;
}
bool ret = false;
try
{
ret = InteropUtil.GetOpenFileNameW(ref openFileName);
}
catch (Exception e)
{
IntPtr hParent = InteropUtil.AssumeNonZero(InteropUtil.GetParent(m_hWnd));
InteropUtil.SendMessage(hParent, InteropUtil.WM_CLOSE, 0, 0);
throw e;
}
//var extErrpr = InteropUtil.CommDlgExtendedError();
//InteropUtil.CheckForWin32Error();
if (m_useCurrentDir)
{
Path = m_currentFolder;
return(true);
}
else if (ret)
{
Marshal.Copy(nativeBuffer, chars, 0, chars.Length);
int firstZeroTerm = ((IList)chars).IndexOf('\0');
if (firstZeroTerm >= 0 && firstZeroTerm <= chars.Length - 1)
{
Path = new string(chars, 0, firstZeroTerm);
}
}
return(ret);
}
finally
{
//revert registry setting
if (hideFileExtSettingChanged)
{
HideFileExtension(true);
}
}
}
finally
{
Marshal.FreeCoTaskMem(nativeBuffer);
if (filterBuffer != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(filterBuffer);
}
}
}