为什么我用论坛经典的用ADO压缩Access2000库的方法无法成功了，（没有分了，补满50分，我就结贴）谢谢各路打下了

我用您的方法单是始终不能成功，非常感谢了

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Debugger Exception Notification
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Project Project1.exe raised exception class EOleSysError with message '不正确的变量类型。'. Process stopped. Use Step or Run to continue.
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OK Help
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// 用ADO压缩Access2000库
#include "utilcls.h"
void CompactDatabase(String f1,String psw1,
String f2,String psw2)
{
String Provider1="Provider=Microsoft.Jet.OLEDB.4.0"
";Data Source="+f1+
";Jet OLEDB:Database Password="+psw1;
String Provider2="Provider=Microsoft.Jet.OLEDB.4.0"
";Data Source="+f2+
";Jet OLEDB:Database Password="+psw2;

Variant Adoobj=Variant::CreateObject("JRO.JetEngine");
Adoobj.OleProcedure("CompactDatabase",Provider1,Provider2);
}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
String f1="yhecdagl1.mdb"; // 源库1
String psw1="yhecdagl"; // 密码1

String f2="yhecdagl2.mdb"; // 新目的库2
String psw2="yhecdagl2"; // 新密码2

String dir=ExtractFilePath(Application->ExeName);
if (FileExists(f2))
DeleteFile(f2);
CompactDatabase(dir+f1,psw1,dir+f2,psw2);
ShowMessage("Finished");
}