public void PrintToPdf(string pdfConfig, string filename)
{
IntPtr nativePdfConfig = Cef3Binder.MyCefCreatePdfPrintSetting(pdfConfig);
MyCefCallback cb = null;
cb = new MyCefCallback((id, args) =>
{
//remove after finish
var metArg = new NativeCallArgs(args);
int isOK = metArg.GetArgAsInt32(1);
tmpCallbacks.Remove(cb);
});
tmpCallbacks.Add(cb);
//
Cef3Binder.MyCefPrintToPdf(_myCefBw.ptr, nativePdfConfig, filename, cb);
}