procedureTForm1.Button2Click(Sender:TObject);
var
SHExecInfo:SHELLEXECUTEINFO;
begin
SHExecInfo.cbSize:=sizeof(SHELLEXECUTEINFO);
SHExecInfo.fMask:=SEE_MASK_NOCLOSEPROCESS;
SHExecInfo.Wnd:=Handle;
SHExecInfo.lpVerb:=nil;
SHExecInfo.lpFile:='WinRAR.exe';
SHExecInfo.lpParameters:='ae:\qwqw.rare:\qwqw';
SHExecInfo.lpDirectory:=nil;
SHExecInfo.nShow:=SW_SHOW;
SHExecInfo.hInstApp:=Handle;
ShellExecuteEx(@SHExecInfo);
WaitForSingleObject(SHExecInfo.hProcess,INFINITE);
CloseHandle(SHExecInfo.hProcess);
ShellExecute(application.MainForm.Handle,'open','winrar.exe',PChar('ae:\zqzq.rare:\zqzq'),'',SW_show);
ShowMessage('壓縮完畢！');}

var
mss:TMemoryStream;
zip:TDeCompressionStream;
zip1:TCompressionStream;
fs:TFileStream;
fBuf:Array[0..16383]ofByte;
flen:Integer;
//從數(shù)據(jù)庫(kù)中取出圖片
//...寫(xiě)出SQL語(yǔ)句以取得有圖片的記錄，此處從略
mss:=TMemoryStream.Create;
fs:=TFileStream.Create('filename.jpg',fmCreateorfmOpenWrite);
try
TBlobField(Que.FieldByName('pic')).SaveToStream(mss);
zip:=TDeCompressionStream.Create(fs);
try
flen:=zip.Read(fbuf,SizeOf(fBuf));
whileflen>0dobegin
fs.Write(fbuf,flen);
flen:=zip.Read(fbuf,SizeOf(fBuf));
end;
finally
FreeAndNil(zip);
end;
finally
mss.Free;
fs.Free;
end;
//將文件filename.jpg中的圖片保存到數(shù)據(jù)庫(kù)
//...寫(xiě)出SQL語(yǔ)句，打開(kāi)Que，并定位到要保存圖片的記錄，此處從略
fs:=TFileStream.Create('filename.jpg',fmOpenRead);
mss:=TMemoryStream.Create;
try
zip1:=TCompressionStream.Create(clDefault,mss);
try
flen:=fs.Read(fbuf,SizeOf(fBuf));
whileflen>0dobegin
zip1.Write(fbuf,flen);
flen:=fs.Read(fbuf,SizeOf(fBuf));
end;
//保存到數(shù)據(jù)庫(kù)
TBlobField(Que.FieldByName('pic')).LoadFromStream(mss);
Que.UpdateBatch();
//...
finally
zip1.Free;
end;
finally
fs.Free;
mss.Free;
end;