public static bool OpenSaveFileDialog(SaveFileDialogOptions options, out string fileName)
{
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
string lpstrFilter;
if (options.Filters.Count > 0)
{
var builder = new StringBuilder();
foreach ((string key, string value) in options.Filters)
{
builder.Append(key);
builder.Append('\0');
builder.Append(value);
builder.Append('\0');
}
lpstrFilter = builder.ToString();
}
else
{
lpstrFilter = null;
}
var buffer = new char[1024];
options.FileName?.CopyTo(0, buffer, 0, Math.Min(options.FileName.Length, 1024));
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
try
{
var arg = new Comdlg32.LPOPENFILENAMEW
{
lStructSize = (uint)Marshal.SizeOf <Comdlg32.LPOPENFILENAMEW>(),
hwndOwner = IntPtr.Zero,
hInstance = IntPtr.Zero,
lpstrFilter = lpstrFilter,
lpstrCustomFilter = null,
nMaxCustFilter = 0,
nFilterIndex = 0,
lpstrFile = handle.AddrOfPinnedObject(),
nMaxFile = 1024,
lpstrFileTitle = null,
nMaxFileTitle = 0,
lpstrInitialDir = null,
lpstrTitle = null,
Flags = Comdlg32.OFN_PATHMUSTEXIST | Comdlg32.OFN_OVERWRITEPROMPT,
nFileOffset = 0,
nFileExtension = 0,
lpstrDefExt = options.DefaultExtension,
lCustData = IntPtr.Zero,
lpfnHook = IntPtr.Zero,
lpTemplateName = null,
//lpEditInfo = IntPtr.Zero,
//lpstrPrompt = null,
pvReserved = IntPtr.Zero,
dwReserved = 0,
FlagsEx = 0
};
if (Comdlg32.GetSaveFileNameW(ref arg))
{
fileName = new string(buffer, 0, Array.IndexOf(buffer, '\0'));
return(true);
}
}
finally
{
if (handle.IsAllocated)
{
handle.Free();
}
}
//uint error = Comdlg32.CommDlgExtendedError();
fileName = null;
return(false);
}
