有很多资料上谈过。
跟你copy一个.
unit ImageListEx;
interface
uses Windows, SysUtils, Classes, Graphics, Controls, Commctrl, ImgList, Consts;
type
TImageListEx = class(TImageList)
public
procedure LoadFromFile(const FileName: string);//实现API方式保存
procedure LoadFromStream(Stream: TStream);
procedure SaveToFile(const FileName: string);
procedure SaveToStream(Stream: TStream);
procedure LoadFromFileEx(const FileName: string);//实现自定义方式保存
procedure LoadFromStreamEx(Stream: TStream);
procedure SaveToFileEx(const FileName: string);
procedure SaveToStreamEx(Stream: TStream);
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('ImageListEx', [TImageListEx]);
end;
{ TImageListEx }
procedure TImageListEx.LoadFromFile(const FileName: string);
var
Stream: TStream;
begin
Stream := TFileStream.Create(FileName, fmOpenRead);
try
LoadFromStream(Stream);
finally
Stream.Free;
end;
end;
procedure TImageListEx.LoadFromFileEx(const FileName: string);
var
Stream: TStream;
begin
Stream := TFileStream.Create(FileName, fmOpenRead);
try
LoadFromStreamEx(Stream);
finally
Stream.Free;
end;
end;
procedure TImageListEx.LoadFromStream(Stream: TStream);
var
SA: TStreamAdapter;
begin
SA := TStreamAdapter.Create(Stream);
try
Handle := ImageList_Read(SA);//将当前图像列表的句柄指向从二进制流中得到的句柄
if Handle = 0 then
raise EReadError.CreateRes(@SImageReadFail);
finally
SA.Free;
end;
end;
procedure TImageListEx.LoadFromStreamEx(Stream: TStream);
var
Width, Height: Integer;
Bitmap, Mask: TBitmap;
BinStream: TMemoryStream;
procedure LoadImageFromStream(Image: TBitmap);
var
Count: DWORD;
begin
Image.Assign(nil);
Stream.ReadBuffer(Count, SizeOf(Count));//首先读出位图的大小
BinStream.Clear;
BinStream.CopyFrom(Stream, Count);//接着读出位图
BinStream.Position := 0;//流指针复位
Image.LoadFromStream(BinStream);
end;
begin
Stream.ReadBuffer(Height, SizeOf(Height));
Stream.ReadBuffer(Width, SizeOf(Width));
Self.Height := Height;
Self.Width := Width;//恢复图像列表原来的高度、宽度
Bitmap := TBitmap.Create;
Mask := TBitmap.Create;
BinStream := TMemoryStream.Create;
try
while Stream.Position <> Stream.Size do
begin
LoadImageFromStream(Bitmap);//从二进制流中读出位图
LoadImageFromStream(Mask);//从二进制流中读出掩码位图
Add(Bitmap, Mask);//将位图及其掩码位图合并添加到图像列表中
end;
finally
Bitmap.Free;
Mask.Free;
BinStream.Free;
end;
end;
procedure TImageListEx.SaveToFile(const FileName: string);
var
Stream: TStream;
begin
Stream := TFileStream.Create(FileName, fmCreate);
try
SaveToStream(Stream);
finally
Stream.Free;
end;
end;
procedure TImageListEx.SaveToFileEx(const FileName: string);
var
Stream: TStream;
begin
Stream := TFileStream.Create(FileName, fmCreate);
try
SaveToStreamEx(Stream);
finally
Stream.Free;
end;
end;
procedure TImageListEx.SaveToStream(Stream: TStream);
var
SA: TStreamAdapter;
begin
SA := TStreamAdapter.Create(Stream);
try
if not ImageList_Write(Handle, SA) then//将当前图像列表保存到二进制流中
raise EWriteError.CreateRes(@SImageWriteFail);
finally
SA.Free;
end;
end;
procedure TImageListEx.SaveToStreamEx(Stream: TStream);
var
I: Integer;
Width, Height: Integer;
Bitmap, Mask: TBitmap;
BinStream: TMemoryStream;
procedure SetImage(Image: TBitmap; IsMask: Boolean);
begin
Image.Assign(nil);//清除上一次保存的图像，避免出现图像重叠
with Image do
begin
if IsMask then Monochrome := True;//掩码位图必须使用单色
Height := Self.Height;
Width := Self.Width;
end;
end;
procedure SaveImageToStream(Image: TBitmap);
var
Count: DWORD;
begin
BinStream.Clear;
Image.SaveToStream(BinStream);
Count := BinStream.Size;
Stream.WriteBuffer(Count, SizeOf(Count));//首先保存位图的大小
Stream.CopyFrom(BinStream, 0);//接着保存位图
end;
begin
Height := Self.Height;
Width := Self.Width;
Stream.WriteBuffer(Height, SizeOf(Height));//保存原图像列表的高度
Stream.WriteBuffer(Width, SizeOf(Width));//保存将原图像列表的宽度
Bitmap := TBitmap.Create;
Mask := TBitmap.Create;
BinStream := TMemoryStream.Create;
try
for I := 0 to Count - 1 do//遂一保存图像列表中的图像
begin
SetImage(Bitmap, False);
SetImage(Mask, True);
GetImages(I, Bitmap, Mask);//取得指定索引号的位图及其掩码位图
SaveImageToStream(Bitmap);//保存位图到二进制流中
SaveImageToStream(Mask);//保存掩码位图到二进制流中
end;
finally
Bitmap.Free;
Mask.Free;
BinStream.Free;
end;
end;
end.
下面示范在Delphi中的使用方法：
首先在Delphi中新建一个项目，然后在Form1上放置一个ImageListEx控件，一个TreeView控件和四个Button控件。将TreeView控件的Images属性与ImageListEx相关联，在ImageListEx中任意添加几幅图像，在TreeView中添加相应数量的项目，项目的ImageIndex属性分别对应于ImageListEx中图像的索引号。现在TreeView中每个项目之前已经能够显示出相应的图标。
最后，在Button1的OnClick事件中写上：
ImageListEx1.SaveToFile('C:/CJ.dat');
ImageListEx1.SaveToFileEx('C:/CJEx.dat');
在Button2的OnClick事件中写上：ImageListEx1.Clear;
在Button3的OnClick事件中写上：ImageListEx1.LoadFromFile('C:/CJ.dat');
在Button4的OnClick事件中写上：ImageListEx1.LoadFromFileEx('C:/CJEx.dat');
运行程序，首先单击Button1，之后单击Button2，最后任意单击Button3或Button4，可以看到程序能够将图像列表中的图像保存到指定的文件中，可以从指定的文件中正确的恢复并显示。
结束语
本文介绍的内容已用于解决本人在实际项目中遇到的情况，也希望同样遇到此问题的程序员能够从中找到答案。以上代码在 Delphi5.0、Windows2000 Server 中调试运行通过。
