静态调用dll时出现[Linker Error] Unresolved external错误

2015-10-23 10:37:59 355 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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dll文件
//---------------------------------------------------------------------------

#include <windows.h>
//---------------------------------------------------------------------------
// Important note about DLL memory management when your DLL uses the
// static version of the RunTime Library:
//
// If your DLL exports any functions that pass String objects (or structs/
// classes containing nested Strings) as parameter or function results,
// you will need to add the library MEMMGR.LIB to both the DLL project and
// any other projects that use the DLL. You will also need to use MEMMGR.LIB
// if any other projects which use the DLL will be performing new or delete
// operations on any non-TObject-derived classes which are exported from the
// DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
// EXE's to use the BORLNDMM.DLL as their memory manager. In these cases,
// the file BORLNDMM.DLL should be deployed along with your DLL.
//
// To avoid using BORLNDMM.DLL, pass string information using "char *" or
// ShortString parameters.
//
// If your DLL uses the dynamic version of the RTL, you do not need to
// explicitly add MEMMGR.LIB as this will be done implicitly for you
//---------------------------------------------------------------------------

#pragma argsused
//在DLL中实现一个求解N的阶乘的功能函数
extern "C" __declspec(dllexport) int __stdcall fac(int n);
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
return 1;
}
//---------------------------------------------------------------------------
int __stdcall fac(int n)
{
if(n==0)
return 1;
else
return(n*fac(n-1));
}

调用dll的文件
#pragma hdrstop

#include "TestUnit.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
extern "C" __declspec(dllimport) int __stdcall fac(int n);
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
int i;
i=fac(StrToInt(Edit1->Text));
ShowMessage("结果是："+AnsiString(i));
}

Build时出现[Linker Error] Unresolved external 'fac' referenced from D:\静态调用DLL\TESTUNIT.OBJ

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