TcxGrid Column動態添加Image，tcxgridcolumn

TcxGrid Column動態添加Image，tcxgridcolumn

      MyCol := TcxColumn.Create;
            ...

            MyCol.PropertiesClass := TcxImageProperties;
            ImageProps := TcxImageProperties(MyCol.Properties);
            ImageProps.Center := True;
            ImageProps.GraphicClassName := '';
            ImageProps.OnGetGraphicClass := GetThumbnailGraphicClass;
            ImageProps.Stretch := True;
            ...

Procedure GetThumbnailGraphicClass:

procedure TCORSA.GetThumbnailGraphicClass(AItem: TObject;
  ARecordIndex: Integer; APastingFromClipboard: Boolean;
  var AGraphicClass: TGraphicClass);
begin
  if AnsiSAmeText(FThumbNailExtension, '.TIF') then
      AGraphicClass := TGraphicClass(GetClass('TTiffGraphic'))
  else
  if AnsiSAmeText(FThumbNailExtension, '.JPG') then
      AGraphicClass := TGraphicClass(GetClass('TJPEGImage'))
end;

The actual thumbnail data is loaded into the grid via streams:

                MStream := TMemoryStream.Create;
                Stream := TStringStream.Create('');

                MStream.LoadFromFile(ThumbNail);
                Stream.CopyFrom(MStream, MStream.Size);

                FActiveGrid.DataController.SetValue(RowInfo.RecordIndex,
                                                    ThumbCol,
                                                    Stream.DataString);

改進後的：

function StreamToVar(Stream: TStream): OleVariant;
var
      P: Pointer;
begin
  Result := VarArrayCreate([0, Stream.size -1],Varbyte);
  P := VarArrayLock(Result);
  Try
    Stream.Position := 0;
    Stream.Read(P^, Stream.size);
  Finally
    VarArrayUnlock(Result);
  end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
  IRecIdx  :  Integer;
  stream : TMemoryStream;
begin
  with cxGrid1TableView1.DataController do
  begin
    IRecIdx := AppendRecord;
    stream := TMemoryStream.Create();
    stream.LoadFromFile('H:\pic\隨拍\IMAG0002.jpg');
     stream.Position := 0;
    Values[IRecIdx,0] := StreamToVar(stream);
    stream.Free;
    Post;
  end;
end;

急datagridview裡添加了datagridviewImageColumn，想把數據庫裡的image列（存的是絕對路徑）顯示成圖片

你可以在紅叉上點擊右鍵，看看圖片屬性，有個地址，先自己判斷下地址對不對，一般這樣的問題就是路徑設置的問題，相對路徑絕對路徑要注意。我這裡有這樣的代碼，如果你需要可以找我要。
 

動態添加的 DataGridViewCheckBoxColumn 通過程序打上勾

你可以參考這個問題
zhidao.baidu.com/question/114371806.html

內容差不多，比方說，dgvOperation為一個DataGridView，第一列為DataGridViewCheckBoxColumn ，你需要選中1，3，4列，就這樣做：
for (int i = 0; i < dgvOperation.Rows.Count; i++)
{
if（(i+1)==1||(i+1)==3||(i+1)==4）
{
//設置選擇框為選中，第一列為checkbox
dgvOperation.Rows[i].Cells[0].Value = true;
}
}

程序寫得比較粗糙，你可以再優化一下，具體的操作就是這樣的了:)