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Delphi下16进制位图数据转位图

Posted on 2013-08-24 08:59  ljl_falcon  阅读(565)  评论(0)  编辑  收藏  举报

如果我们在Form中拖入一个Image控件，并设置好picture后，Alt+F12就可以看到Form的源代码中已经将图片转成了16进制字符串，如下：

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object Image1: TImage
    Left = 536
    Top = 24
    Width = 105
    Height = 105
    Picture.Data = {
      07544269746D61703E040000424D3E0400000000000036000000280000000700
      00002B000000010018000000000008040000C40E0000C40E0000000000000000
      0001BBE7F4BCE8F5BDE9F6BBE7F4BDE9F6BFEBF8BEEAF7000000B0E9F2B0E9F2
      B0E9F2B0E9F2B1EAF3B2EBF4B1EAF3000000ADE5F8ADE5F8ACE4F7ADE5F8ACE4
      F7AAE2F5ABE3F60000009DE4F89DE4F89DE4F89DE4F89DE4F89DE4F89DE4F800
      00009DE4F89DE4F89DE4F89DE4F89DE4F89DE4F89DE4F80000009BE4F89BE4F8
      9BE4F89BE4F89BE4F89BE4F89BE4F80000009BE4F89BE4F89BE4F89BE4F89BE4
      F89BE4F89BE4F80000009BE4F89BE4F89BE4F89BE4F89BE4F89BE4F89BE4F800
      00009EE5F99EE5F99EE5F99EE5F99EE5F99EE5F99EE5F9000000A0E5F9A0E5F9
      A0E5F9A0E5F9A0E5F9A0E5F9A0E5F9000000A1E4F9A1E4F9A1E4F9A1E4F9A1E4
      F9A1E4F9A1E4F9000000A1E6F9A1E6F9A1E6F9A1E6F9A1E6F9A1E6F9A1E6F900
      0000A2E6F9A2E6F9A2E6F9A2E6F9A2E6F9A2E6F9A2E6F9000000A2E6F9A2E6F9
      A2E6F9A2E6F9A2E6F9A2E6F9A2E6F9000000A5E6FBA5E6FBA5E6FBA5E6FBA5E6
      FBA5E6FBA5E6FB000000A8E7FBA8E7FBA8E7FBA8E7FBA8E7FBA8E7FBA8E7FB00
      0000AAE7FBAAE7FBAAE7FBAAE7FBAAE7FBAAE7FBAAE7FB000000AAE8FAAAE8FA
      AAE8FAAAE8FAAAE8FAAAE8FAAAE8FA000000ABE9F9ABE9F9ABE9F9ABE9F9ABE9
      F9ABE9F9ABE9F9000000AEE9F9AEE9F9AEE9F9AEE9F9AEE9F9AEE9F9AEE9F900
      0000B1E9FAB1E9FAB1E9FAB1E9FAB1E9FAB1E9FAB1E9FA000000B1E9FAB1E9FA
      B1E9FAB1E9FAB1E9FAB1E9FAB1E9FA000000B4EAFBB4EAFBB4EAFBB4EAFBB4EA
      FBB4EAFBB4EAFB000000B7EBFBB7EBFBB7EBFBB7EBFBB7EBFBB7EBFBB7EBFB00
      0000B9ECFCB9ECFCB9ECFCB9ECFCB9ECFCB9ECFCB9ECFC000000B9ECFCB9ECFC
      B9ECFCB9ECFCB9ECFCB9ECFCB9ECFC000000B9ECFCB9ECFCB9ECFCB9ECFCB9EC
      FCB9ECFCB9ECFC000000C0EDFBC0EDFBC0EDFBC0EDFBC0EDFBC0EDFBC0EDFB00
      0000C0EDFBC0EDFBC0EDFBC0EDFBC0EDFBC0EDFBC0EDFB000000C2EEFBC2EEFB
      C2EEFBC2EEFBC2EEFBC2EEFBC2EEFB000000C3EFFCC3EFFCC3EFFCC3EFFCC3EF
      FCC3EFFCC3EFFC000000C5EFFBC5EFFBC5EFFBC5EFFBC5EFFBC5EFFBC5EFFB00
      0000C8F0FCC8F0FCC8F0FCC8F0FCC8F0FCC8F0FCC8F0FC000000CAF1FACAF1FA
      CAF1FACAF1FACAF1FACAF1FACAF1FA000000CBF2FBCBF2FBCBF2FBCBF2FBCBF2
      FBCBF2FBCBF2FB000000CEF1FBCEF1FBCEF1FBCEF1FBCEF1FBCEF1FBCEF1FB00
      0000CEF1FBCEF1FBCEF1FBCEF1FBCEF1FBCEF1FBCEF1FB000000CFF2FCCFF2FC
      CFF2FCCFF2FCCFF2FCCFF2FCCFF2FC000000D2F2FDD2F2FDD2F2FDD2F2FDD2F2
      FDD2F2FDD2F2FD000000D2F3FCD2F3FCD2F3FCD2F3FCD2F3FCD2F3FCD2F3FC00
      0000D4F3FCD4F3FCD4F3FCD4F3FCD4F3FCD4F3FCD4F3FC000000D4F3FCD4F3FC
      D4F3FCD4F3FCD4F3FCD4F3FCD4F3FC000000D4F3FCD4F3FCD4F3FCD4F3FCD4F3
      FCD4F3FCD4F3FC000000}
  end

那么在实际的应用中如何实现把图片转16进制呢，可以参考以下转换PNG的例子，其他格式的图片转换都基本类似：

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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;

在个别时候，可能需要解析From源代码中生成的16进制图片，可以参考以下代码：

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BtnImg1 := TBitmap.Create;
MS1 := TMemoryStream.Create;
MSHexdata1 :=
    '424D660200000000000036000000280000000500'+
    '000023000000010018000000000030020000C40E0000C40E0000000000000000'+
    '0001CE8505CE8505CE8505CE8505CE850500CE8505CE8505CE8505CE8505CE85'+
    '0500EDAA34EDAA34EDAA34EDAA34EDAA3400EDAA35EDAA35EDAA35EDAA35EDAA'+
    '3500EDAA35EDAA35EDAA35EDAA35EDAA3500EEAB36EEAB36EEAB36EEAB36EEAB'+
    '3600EEAB36EEAB36EEAB36EEAB36EEAB3600EEAC37EEAC37EEAC37EEAC37EEAC'+
    '3700EFAC37EFAC37EFAC37EFAC37EFAC3700EFAD38EFAD38EFAD38EFAD38EFAD'+
    '3800F0AD38F0AD38F0AD38F0AD38F0AD3800F0AE39F0AE39F0AE39F0AE39F0AE'+
    '3900F0AE39F0AE39F0AE39F0AE39F0AE3900F1AF3AF1AF3AF1AF3AF1AF3AF1AF'+
    '3A00F2B03AF2B03AF2B03AF2B03AF2B03A00F2B03AF2B03AF2B03AF2B03AF2B0'+
    '3A00F3B13CF3B13CF3B13CF3B13CF3B13C00F3B13CF3B13CF3B13CF3B13CF3B1'+
    '3C00F4B23DF4B23DF4B23DF4B23DF4B23D00F5B33EF5B33EF5B33EF5B33EF5B3'+
    '3E00F5B33EF5B33EF5B33EF5B33EF5B33E00F6B43FF6B43FF6B43FF6B43FF6B4'+
    '3F00F6B43FF6B43FF6B43FF6B43FF6B43F00F7B540F7B540F7B540F7B540F7B5'+
    '4000F7B641F7B641F7B641F7B641F7B64100F8B641F8B641F8B641F8B641F8B6'+
    '4100F8B742F8B742F8B742F8B742F8B74200F9B742F9B742F9B742F9B742F9B7'+
    '4200F9B843F9B843F9B843F9B843F9B84300F9B843F9B843F9B843F9B843F9B8'+
    '4300FAB844FAB844FAB844FAB844FAB84400FAB944FAB944FAB944FAB944FAB9'+
    '4400FAB944FAB944FAB944FAB944FAB94400FBBF53FBBF53FBBF53FBBF53FBBF'+
    '5300FCCA6FFCCA6FFCCA6FFCCA6FFCCA6F00';
MS1.SetSize(Length(MSHexdata1) div 2);
HexToBin(PChar(MSHexdata1),MS1.Memory,MS1.Size);
MS1.SaveToFile('c:\1.bmp');
BtnImg1.LoadFromStream(MS1);

MSHexdata1 的值就是直接从Form源代码中粘贴出来的，需要注意的是：
粘贴的时候，要去掉开头的一小段类信息：

如本例中就已经去掉了开头的“07544269746D61703E040000”，这段信息转换成ASCII如下图：

并不是图像信息的一部分，而是delphi的标记，因此需要去掉，否则生成的图像将无法显示。