dll中怎么封装图片？

[51372083]

我想用delphi做一个动态库，里边封装一些主程序用到的图片，不知道改怎么封装，在主程序中怎么调用？最好有详细的代码。

[ly_liuyang]

Pointer Buffer,图片数据的内存块~

[SonicX]

先把图片做在DLL的资源文件里

程序中
var
Modulehandle:HMODULE;
bmp:Tbitmap;
begin
Modulehandle:=LoadLibrary('shell32.dll');
bmp:=Tbitmap.Create;
bmp.LoadFromResourceID(Modulehandle,130); //假设图片资源ID号为130
FreeLibrary(Modulehandle);
self.Canvas.Draw(0,0,bmp);
bmp.Free;
end;

[51372083]

不太明白，是不是可以做成资源文件打包图片呢

[SonicX]

先建立个RC文本文件
比如aaa.rc
内容为
130 BITMAP aaa.bmp

在写DLL时将此文件添加进去

编译

再用上面那段程序从DLL中引出

[51372083]

好的，我试试，明天给你答复

[dctony]

建一个DLL，什么代码都不要写只要把你放图片的资源文件包含进来就可以了
library MyResource;

{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }

uses
SysUtils,
Classes;

{$R Resource.res} //放图片的资源文件
{$R *.res}

begin

end.

[dctony]

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls, StdCtrls, Buttons;

type
TForm1 = class(TForm)
Image1: TImage;
procedure FormCreate(Sender: TObject);
end;

var
Form1: TForm1;
ResourceDLL: THandle = 0;

implementation

{$R *.dfm}

//xResourceName: 资源文件中的资源名 xBMP: 用来接图片
procedure LoadBMP(xResourceName: string; xBMP: TBitmap);
var
mHandle, mMemory: THandle;
mSize: Longint;
mData: PByte;
mBmpHdr: TBitmapFileHeader;
mStream: TMemoryStream;
begin
mHandle := FindResource(ResourceDLL, PChar(xResourceName), RT_BITMAP);
if mHandle = 0 then Exit;
mMemory := LoadResource(ResourceDLL, mHandle);
if mMemory = 0 then Exit;
mData := LockResource(mMemory);
try
mSize := SizeofResource(ResourceDLL, mHandle);
mStream := TMemoryStream.Create;
try
mBmpHdr.bfType := $4D42;
mStream.SetSize(SizeOf(mBmpHdr) + mSize);
mStream.Write(mBmpHdr, Sizeof(mBmpHdr));
mStream.Write(mData^, mSize);
mStream.Seek(0, 0);
xBMP.LoadFromStream(mStream);
finally
mStream.Free;
end;
finally
UnlockResource(mMemory);
end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
LoadBMP('BMP1', Image1.Picture.Bitmap);
end;

initialization
ResourceDLL := LoadLibrary('MyResource.dll');

finalization
if ResourceDLL <> 0 then
FreeLibrary(ResourceDLL);
end.