uses pngimage;
{从 png 图片到十六进制字符串}function Png2Hex(png: TPngImage): string;var stream: TMemoryStream;begin stream := TMemoryStream.Create; png.SaveToStream(stream,',','); SetLength(Result, stream.Size * 2,',','); BinToHex(stream.Memory, PChar(Result), stream.Size,',','); stream.Free;end;
{从十六进制字符串恢复 png 图片}procedure Hex2Png(str: string; out png: TPngImage,',',');var stream: TMemoryStream;begin if not Assigned(png) then png := TPngImage.Create; stream := TMemoryStream.Create; stream.SetSize(Length(str) div 2,',','); HexToBin(PChar(str), stream.Memory, stream.Size,',','); png.LoadFromStream(stream,',','); stream.Free;end;
{测试}procedure TForm1.Button1Click(Sender: TObject,',',');var png: TPngImage;begin png := TPngImage.Create; png.LoadFromFile('c:/temp/test.png',',','); Memo1.Text := Png2Hex(png,',','); png.Free;end;
procedure TForm1.Button2Click(Sender: TObject,',',');var png: TPngImage;begin png := TPngImage.Create; Hex2Png(Memo1.Text, png,',','); Canvas.Draw(0, 0, png,',','); png.Free;end;
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