获取 DBGrid/dxDBGrid 的当前选中字符串

之前编写数据查询程序，需获取 DBGrid/dxDBGrid 中 焦点“单元格” 的选中字符串，折腾良久，终发现一简单方法...

    var
      hDBGrid: HWND;
    begin
      hDBGrid:= WindowFromPoint(Mouse.CursorPos);
      SendMessage(hDBGrid, WM_COPY, 0, 0);
      edt_SelTxtTmp.Clear; //edt_SelTxtTmp: TEdit;
      SendMessage(edt_SelTxtTmp.Handle, WM_PASTE, 0, 0);
    end;

    若欲通过 VCL 源码来寻求解决之道，貌似不会简单；以简如 SendMessage 之法搞定某些 简单却又繁琐 的问题，不失为妙方...