private async Task <StorageFile> DoPickSaveFileAsync()
{
NativeMethods.OPENFILENAME ofn = new FileSavePicker.NativeMethods.OPENFILENAME();
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair <string, IList <string> > item in FileTypeChoices)
{
sb.Append(item.Key + "\0");
foreach (string filetype in item.Value)
{
sb.Append("*" + filetype + ";");
}
if (sb[sb.Length - 1] == ';')
{
sb.Length -= 1;
}
sb.Append('\0');
}
sb.Append("\0");
ofn.lpstrFilter = sb.ToString();
ofn.lStructSize = Marshal.SizeOf(ofn);
ofn.nMaxFile = 256;
ofn.lpstrFile = new string('\0', ofn.nMaxFile);
ofn.Flags = 0x02001000;
if (!string.IsNullOrEmpty(DefaultFileExtension))
{
ofn.lpstrDefExt = DefaultFileExtension.Substring(DefaultFileExtension.StartsWith(".") ? 1 : 0);
}
bool success = NativeMethods.GetSaveFileName(ref ofn);
if (success)
{
File.Create(ofn.lpstrFile).Close();
return(new StorageFile(ofn.lpstrFile));
}
return(null);
}
private async Task<StorageFile> PickSaveFileAsyncImpl()
{
NativeMethods.OPENFILENAME ofn = new FileSavePicker.NativeMethods.OPENFILENAME();
StringBuilder sb = new StringBuilder();
foreach(KeyValuePair<string,IList<string>> item in FileTypeChoices)
{
sb.Append(item.Key + "\0");
foreach (string filetype in item.Value)
{
sb.Append("*" + filetype + ";");
}
if(sb[sb.Length-1] == ';')
{
sb.Length -= 1;
}
sb.Append('\0');
}
sb.Append("\0");
ofn.lpstrFilter = sb.ToString();
ofn.lStructSize = Marshal.SizeOf(ofn);
ofn.nMaxFile = 256;
ofn.lpstrFile = new string('\0', ofn.nMaxFile);
ofn.Flags = 0x02001000;
if(!string.IsNullOrEmpty(DefaultFileExtension))
{
ofn.lpstrDefExt = DefaultFileExtension.Substring(DefaultFileExtension.StartsWith(".") ? 1 : 0);
}
bool success = NativeMethods.GetSaveFileName(ref ofn);
if(success)
{
File.Create(ofn.lpstrFile).Close();
return new StorageFile(ofn.lpstrFile);
}
return null;
}
