关于dll中带有数据库控件的问题！

[krakan]

以前看了一篇文章，说在dll中用到数据库控件，一定要有TDataModule和TSession，是这样的吗？
如果不是，那该怎么办？
以下是我想把数据库连接做到dll中，可是当调试的时候总会冒出：“Project go.exe raised exception class EOleSysError with message"尚未调用"CoInitialize。".Process stopped.Use Step or Run to continue.”



这是我的源程序
extern "C" __declspec(dllexport) _stdcall void DBConnect();
//---------------------------------------------------------------------------
__fastcall TDBC::TDBC(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TDBC::Button1Click(TObject *Sender)
{
DBConnection->ConnectionString ="Provider=SQLOLEDB.1;Password=" + pwd->Text+";Persist Security Info=True;User ID="+user->Text+";Initial Catalog="+dbname->Text+";Data Source="+addr->Text+";";

}
//---------------------------------------------------------------------------

void __fastcall TDBC::Button2Click(TObject *Sender)
{
Close();
}
//---------------------------------------------------------------------------
void _stdcall DBConnect()
{
TDBC *DBC = new TDBC(NULL);
DBC->ShowModal();
delete DBC;
}

[ktcserver]

在你的DLL文件入口处加上
CoInitialize（）；

[krakan]

没用啊！

[asimpleman]

gz

[sunliwen780502]

int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void *lpReserved)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
CoInitialize(NULL);//初始化COM对象
break;
case DLL_PROCESS_DETACH: //释放COM对象
CoUnitialize(NULL);
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
default;
break;
}
}

[krakan]

我顶！

[圣殿骑士18]

好惨啊，帮你顶。

[krakan]

唉，怎么经典的问题竟然没人回答

[ethZOD]

嘿嘿

偶在另一个线程里调用一样是这个错误

后来好象是在主线程里open了一下，就能用了

不知道为什么~~~

[xiaomatian]

#include "objbase.h"
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void *lpReserved)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
CoInitialize(NULL);//初始化COM对象
break;
case DLL_PROCESS_DETACH: //释放COM对象
CoUnitialize(NULL);
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
default;
break;
}
}