protected override Boolean RunDialog(IntPtr hwndOwner)
{
IntPtr pidlRoot = IntPtr.Zero;
Boolean result = false;
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hwndOwner, (Int32)_rootFolder, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hwndOwner, 0, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
throw new InvalidOperationException("Unable to retrieve the root folder.");
}
}
Int32 options = NEW_DIALOG_STYLE_OPTION;
if (!ShowNewFolderButton)
{
options += HIDE_NEW_FOLDER_BUTTON_OPTION;
}
IntPtr pidlRet = IntPtr.Zero;
IntPtr pszDisplayName = IntPtr.Zero;
IntPtr pszSelectedPath = IntPtr.Zero;
UnsafeNativeMethods.BrowseCallbackProc callback;
try
{
var browseInfo = new UnsafeNativeMethods.BrowseInfo();
pszDisplayName = Marshal.AllocHGlobal(MAX_PATH * Marshal.SystemDefaultCharSize);
pszSelectedPath = Marshal.AllocHGlobal(MAX_PATH * Marshal.SystemDefaultCharSize);
callback = new UnsafeNativeMethods.BrowseCallbackProc(BrowseCallbackHandler);
browseInfo.pidlRoot = pidlRoot;
browseInfo.hwndOwner = hwndOwner;
browseInfo.pszDisplayName = pszDisplayName;
browseInfo.lpszTitle = _descriptionText;
browseInfo.ulFlags = options;
browseInfo.lpfn = callback;
browseInfo.lParam = IntPtr.Zero;
browseInfo.iImage = 0;
pidlRet = UnsafeNativeMethods.Shell32.SHBrowseForFolder(browseInfo);
if (pidlRet != IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetPathFromIDList(pidlRet, pszSelectedPath);
_selectedPathNeedsCheck = true;
_selectedPath = Marshal.PtrToStringAuto(pszSelectedPath);
result = true;
}
}
finally
{
UnsafeNativeMethods.Ole32.CoTaskMemFree(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
UnsafeNativeMethods.Ole32.CoTaskMemFree(pidlRet);
}
if (pszSelectedPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszSelectedPath);
}
if (pszDisplayName != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszDisplayName);
}
callback = null;
}
return(result);
}
/// <include file='doc\FolderBrowserDialog.uex' path='docs/doc[@for="FolderBrowserDialog.RunDialog"]/*' />
/// <devdoc>
/// Implements running of a folder browser dialog.
/// </devdoc>
protected override bool RunDialog(IntPtr hWndOwner)
{
IntPtr pidlRoot = IntPtr.Zero;
bool returnValue = false;
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hWndOwner, (int)rootFolder, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hWndOwner, NativeMethods.CSIDL_DESKTOP, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
throw new InvalidOperationException(SR.GetString(SR.FolderBrowserDialogNoRootFolder));
}
}
int mergedOptions = unchecked ((int)(long)UnsafeNativeMethods.BrowseInfos.NewDialogStyle);
if (!showNewFolderButton)
{
mergedOptions += unchecked ((int)(long)UnsafeNativeMethods.BrowseInfos.HideNewFolderButton);
}
// The SHBrowserForFolder dialog is OLE/COM based, and documented as only being safe to use under the STA
// threading model if the BIF_NEWDIALOGSTYLE flag has been requested (which we always do in mergedOptions
// above). So make sure OLE is initialized, and throw an exception if caller attempts to invoke dialog
// under the MTA threading model (...dialog does appear under MTA, but is totally non-functional).
if (Control.CheckForIllegalCrossThreadCalls && Application.OleRequired() != System.Threading.ApartmentState.STA)
{
throw new System.Threading.ThreadStateException(SR.GetString(SR.DebuggingExceptionOnly, SR.GetString(SR.ThreadMustBeSTA)));
}
IntPtr pidlRet = IntPtr.Zero;
IntPtr pszDisplayName = IntPtr.Zero;
IntPtr pszSelectedPath = IntPtr.Zero;
try
{
// Construct a BROWSEINFO
UnsafeNativeMethods.BROWSEINFO bi = new UnsafeNativeMethods.BROWSEINFO();
pszDisplayName = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
pszSelectedPath = Marshal.AllocHGlobal((NativeMethods.MAX_PATH + 1) * Marshal.SystemDefaultCharSize);
this.callback = new UnsafeNativeMethods.BrowseCallbackProc(this.FolderBrowserDialog_BrowseCallbackProc);
bi.pidlRoot = pidlRoot;
bi.hwndOwner = hWndOwner;
bi.pszDisplayName = pszDisplayName;
bi.lpszTitle = descriptionText;
bi.ulFlags = mergedOptions;
bi.lpfn = callback;
bi.lParam = IntPtr.Zero;
bi.iImage = 0;
// And show the dialog
pidlRet = UnsafeNativeMethods.Shell32.SHBrowseForFolder(bi);
if (pidlRet != IntPtr.Zero)
{
// Then retrieve the path from the IDList
UnsafeNativeMethods.Shell32.SHGetPathFromIDListLongPath(pidlRet, ref pszSelectedPath);
// set the flag to True before selectedPath is set to
// assure security check and avoid bogus race condition
selectedPathNeedsCheck = true;
// Convert to a string
selectedPath = Marshal.PtrToStringAuto(pszSelectedPath);
returnValue = true;
}
}
finally
{
UnsafeNativeMethods.CoTaskMemFree(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
UnsafeNativeMethods.CoTaskMemFree(pidlRet);
}
// Then free all the stuff we've allocated or the SH API gave us
if (pszSelectedPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszSelectedPath);
}
if (pszDisplayName != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszDisplayName);
}
this.callback = null;
}
return(returnValue);
}
/// <include file='doc\FolderBrowserDialog.uex' path='docs/doc[@for="FolderBrowserDialog.RunDialog"]/*' />
/// <devdoc>
/// Implements running of a folder browser dialog.
/// </devdoc>
protected override bool RunDialog(IntPtr hWndOwner)
{
IntPtr pidlRoot = IntPtr.Zero;
bool returnValue = false;
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hWndOwner, (int)rootFolder, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hWndOwner, NativeMethods.CSIDL_DESKTOP, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
throw new Exception(SR.GetString(SR.FolderBrowserDialogNoRootFolder));
}
}
int mergedOptions = (int)UnsafeNativeMethods.BrowseInfos.NewDialogStyle;
if (!showNewFolderButton)
{
mergedOptions += (int)UnsafeNativeMethods.BrowseInfos.HideNewFolderButton;
}
Application.OleRequired();
IntPtr pidlRet = IntPtr.Zero;
try {
// Construct a BROWSEINFO
UnsafeNativeMethods.BROWSEINFO bi = new UnsafeNativeMethods.BROWSEINFO();
IntPtr pszDisplayName = Marshal.AllocHGlobal(NativeMethods.MAX_PATH);
IntPtr pszSelectedPath = Marshal.AllocHGlobal(NativeMethods.MAX_PATH);
UnsafeNativeMethods.BrowseCallbackProc callback = new UnsafeNativeMethods.BrowseCallbackProc(this.FolderBrowserDialog_BrowseCallbackProc);
bi.pidlRoot = pidlRoot;
bi.hwndOwner = hWndOwner;
bi.pszDisplayName = pszDisplayName;
bi.lpszTitle = descriptionText;
bi.ulFlags = mergedOptions;
bi.lpfn = callback;
bi.lParam = IntPtr.Zero;
bi.iImage = 0;
// And show the dialog
pidlRet = UnsafeNativeMethods.Shell32.SHBrowseForFolder(bi);
if (pidlRet != IntPtr.Zero)
{
// Then retrieve the path from the IDList
UnsafeNativeMethods.Shell32.SHGetPathFromIDList(pidlRet, pszSelectedPath);
// set the flag to True before selectedPath is set to
// assure security check and avoid bogus race condition
selectedPathNeedsCheck = true;
// Convert to a string
selectedPath = Marshal.PtrToStringAuto(pszSelectedPath);
// Then free all the stuff we've allocated or the SH API gave us
Marshal.FreeHGlobal(pszSelectedPath);
Marshal.FreeHGlobal(pszDisplayName);
returnValue = true;
}
}
finally
{
UnsafeNativeMethods.IMalloc malloc = GetSHMalloc();
malloc.Free(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
malloc.Free(pidlRet);
}
}
return(returnValue);
}
/// <include file='doc\FolderBrowserDialog.uex' path='docs/doc[@for="FolderBrowserDialog.RunDialog"]/*' />
/// <devdoc>
/// Implements running of a folder browser dialog.
/// </devdoc>
protected override bool RunDialog(IntPtr hWndOwner)
{
IntPtr pidlRoot = IntPtr.Zero;
bool returnValue = false;
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hWndOwner, (int) rootFolder, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hWndOwner, NativeMethods.CSIDL_DESKTOP, ref pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
throw new InvalidOperationException(SR.GetString(SR.FolderBrowserDialogNoRootFolder));
}
}
int mergedOptions = unchecked( (int) (long)UnsafeNativeMethods.BrowseInfos.NewDialogStyle);
if (!showNewFolderButton)
{
mergedOptions += unchecked( (int) (long)UnsafeNativeMethods.BrowseInfos.HideNewFolderButton);
}
// The SHBrowserForFolder dialog is OLE/COM based, and documented as only being safe to use under the STA
// threading model if the BIF_NEWDIALOGSTYLE flag has been requested (which we always do in mergedOptions
// above). So make sure OLE is initialized, and throw an exception if caller attempts to invoke dialog
// under the MTA threading model (...dialog does appear under MTA, but is totally non-functional).
if (Control.CheckForIllegalCrossThreadCalls && Application.OleRequired() != System.Threading.ApartmentState.STA)
{
throw new System.Threading.ThreadStateException(SR.GetString(SR.DebuggingExceptionOnly, SR.GetString(SR.ThreadMustBeSTA)));
}
IntPtr pidlRet = IntPtr.Zero;
IntPtr pszDisplayName = IntPtr.Zero;
IntPtr pszSelectedPath = IntPtr.Zero;
try
{
// Construct a BROWSEINFO
UnsafeNativeMethods.BROWSEINFO bi = new UnsafeNativeMethods.BROWSEINFO();
pszDisplayName = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
pszSelectedPath = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
this.callback = new UnsafeNativeMethods.BrowseCallbackProc(this.FolderBrowserDialog_BrowseCallbackProc);
bi.pidlRoot = pidlRoot;
bi.hwndOwner = hWndOwner;
bi.pszDisplayName = pszDisplayName;
bi.lpszTitle = descriptionText;
bi.ulFlags = mergedOptions;
bi.lpfn = callback;
bi.lParam = IntPtr.Zero;
bi.iImage = 0;
// And show the dialog
pidlRet = UnsafeNativeMethods.Shell32.SHBrowseForFolder(bi);
if (pidlRet != IntPtr.Zero)
{
// Then retrieve the path from the IDList
UnsafeNativeMethods.Shell32.SHGetPathFromIDList(pidlRet, pszSelectedPath);
// set the flag to True before selectedPath is set to
// assure security check and avoid bogus race condition
selectedPathNeedsCheck = true;
// Convert to a string
selectedPath = Marshal.PtrToStringAuto(pszSelectedPath);
returnValue = true;
}
}
finally
{
UnsafeNativeMethods.CoTaskMemFree(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
UnsafeNativeMethods.CoTaskMemFree(pidlRet);
}
// Then free all the stuff we've allocated or the SH API gave us
if (pszSelectedPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszSelectedPath);
}
if (pszDisplayName != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszDisplayName);
}
this.callback = null;
}
return returnValue;
}
/// <summary>
/// When overridden in a derived class, specifies a common dialog box.
/// </summary>
/// <param name="hwndOwner">A value that represents the window handle of the owner window for the common dialog box.</param>
/// <returns>true if the dialog box was successfully run; otherwise, false.</returns>
protected override bool RunDialog(IntPtr hwndOwner)
{
IntPtr root = IntPtr.Zero;
bool flag = false;
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hwndOwner, (int)Environment.SpecialFolder.Desktop, ref root);
int browseInfoFlags = NativeMethods.BIF_NEWDIALOGSTYLE;
if (!_showNewFolderButton)
{
browseInfoFlags += NativeMethods.BIF_NONEWFOLDERBUTTON;
}
IntPtr pidl = IntPtr.Zero;
IntPtr hglobal = IntPtr.Zero;
IntPtr pszPath = IntPtr.Zero;
try
{
hglobal = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
pszPath = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
_callback = new UnsafeNativeMethods.BrowseCallbackProc(OnBrowseCallbackProc);
UnsafeNativeMethods.BROWSEINFO lpbi = new UnsafeNativeMethods.BROWSEINFO();
lpbi.pidlRoot = root;
lpbi.hwndOwner = hwndOwner;
lpbi.pszDisplayName = hglobal;
lpbi.lpszTitle = _descriptionText;
lpbi.ulFlags = browseInfoFlags;
lpbi.lpfn = _callback;
lpbi.lParam = IntPtr.Zero;
lpbi.iImage = 0;
pidl = UnsafeNativeMethods.Shell32.SHBrowseForFolder(lpbi);
if (pidl != IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetPathFromIDList(pidl, pszPath);
_selectedPathNeedsCheck = true;
_selectedPath = Marshal.PtrToStringAuto(pszPath);
flag = true;
}
}
finally
{
UnsafeNativeMethods.IMalloc sHMalloc = GetSHMalloc();
sHMalloc.Free(root);
if (pidl != IntPtr.Zero)
sHMalloc.Free(pidl);
if (pszPath != IntPtr.Zero)
Marshal.FreeHGlobal(pszPath);
if (hglobal != IntPtr.Zero)
Marshal.FreeHGlobal(hglobal);
_callback = null;
}
return flag;
}
