我正在尝试创建一个用于VBA程序的C ++ DLL。我正在关注this example并成功编译示例代码并使用生成的DLL。但是，我需要为DLL添加一些额外的功能，所以我在示例代码中创建了一些函数并重新编译它。然后我做了一个测试程序来测试我的新功能。当我尝试从我的测试项目调用一些DLL函数时，我得到类似于此的链接器错误：
error LNK2019: unresolved external symbol "int __stdcall PWCreateDocument(long,char *,char *)" (?PWCreateDocument@@YGHJPAD0@Z) referenced in function _wmain
当我调用函数来初始化ProjectWise，CVbaHelperApp :: InitInstance（）和我的自定义函数PWCreateDocument时，会发生此错误。
当我调用PWGetLastErrorMessage（）时，此错误不会发生。我可以从我的测试程序访问此函数，但不能访问DLL中的任何其他函数。
我排除了任何常见的链接器错误，例如，函数头和定义之间的拼写错误/错误类型。
我觉得很奇怪，我可以成功调用PWGetLastErrorMesssage而不是任何其他函数。
以下是我的测试程序vbaHelperTest3.cpp的代码：
#include "stdafx.h"
typedef long LONG;
typedef int BOOL;
int _tmain(int argc, _TCHAR* argv[])
{
char* filePath = "C:\\pwworking\\cemvn\\b2edsjga\\d0572507\\";
char* fileName = "BUMP Imagery 2009.xwms";
LONG projID = 572507;
char* errorMsg;
std::cout << "Hello World" << std::endl;
CVbaHelperApp myApp;
BOOL isInit = myApp.InitInstance();
std::cout << "Is Initialized? " << isInit << std::endl;
errorMsg = PWGetLastErrorMessage();
std::cout << "Error Message: " << errorMsg << std::endl;
BOOL results = PWCreateDocument(projID, filePath, fileName);
std::cout << "PWCreateDocument Result: " << results << std::endl;
return 0;
}
标头stdafx.h包含我的DLL的标头vbaHelper.h。这是vbaHelper.h的代码：
// vbaHelper.h : main header file for the VBAHELPER DLL
//
#include "stdafx.h"
#if !defined(AFX_VBAHELPER_H__3FBDA9E4_EE8B_4AA1_8FD0_21A0A8B6C590__INCLUDED_)
#define AFX_VBAHELPER_H__3FBDA9E4_EE8B_4AA1_8FD0_21A0A8B6C590__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif
#include "resource.h" // main symbols
/////////////////////////////////////////////////////////////////////////////
// CVbaHelperApp
// See vbaHelper.cpp for the implementation of this class
//
class CVbaHelperApp : public CWinApp
{
public:
CVbaHelperApp();
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CVbaHelperApp)
public:
virtual BOOL InitInstance();
virtual int ExitInstance();
//}}AFX_VIRTUAL
//{{AFX_MSG(CVbaHelperApp)
// NOTE - the ClassWizard will add and remove member functions here.
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
/////////////////////////////////////////////////////////////////////////////
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
//Function definitions added by me
typedef int BOOL;
typedef long LONG;
LONG __stdcall PWGetDocumentName( LONG , LONG , VOID **);
LONG __stdcall PWGetDocumentIDs( TCHAR **, LONG *, LONG *);
BOOL __stdcall PWCreateDocument( LONG, char*, char*);
char * __stdcall PWGetLastErrorMessage(void);
#endif // !defined(AFX_VBAHELPER_H__3FBDA9E4_EE8B_4AA1_8FD0_21A0A8B6C590__INCLUDED_)
最后，这是vbaHelper.cpp的代码，DLL：
/****************************************************************************
*
* ProjectWise(TM) Software Development Kit
* Sample Application
* Copyright (C) 2003 Bentley Systems, Incorporated
* All Rights Reserved
*
****************************************************************************/
/****************************************************************************
*
* Project Name: VbaHelper
*
* Project Description: This example is used in conjunction with MicroStation's
* VBA to extract a Design file's attributes.
*
* File name: VbaHelper.cpp
*
* File description: Custom Module implementation
*
****************************************************************************/
/*---------------------------------------------------------------------------
Copyright (C) 2003 Bentley Systems, Incorporated
All Rights Reserved
THIS IS AN OPEN SOURCE CODE OF BENTLEY SYSTEMS, INCORPORATED
You have a royalty-free right to use, modify, reproduce and distribute
the Sample Applications (and/or any modified version) in any way you find
useful, provided that you agree that Bentley Systems, Incorporated has no
warranty obligations or liability for any Sample Application files which
are modified.
No guarantees of performance accompany Sample Application, nor is any
responsibility assumed on the part of the author(s). The software has
been tested extensively and every effort has been made to insure its
reliability.
---------------------------------------------------------------------------*/
/****************************************************************************
*
* Include Files
*
****************************************************************************/
#include "stdafx.h"
#include "vbaHelper.h"
#include "aaatypes.h"
#include "aadmsdef.h"
#include "aawddef.h"
#include "aawindef.h"
#include "aaodsdef.h"
#include "stdtypes.h"
#include "aadmsapi.fdf"
#include "aawinapi.fdf"
#include "aawindms.fdf"
#include "aaodsapi.fdf"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define DLLEXPORT __declspec( dllexport )
#define WINAPI __stdcall
//
// Note!
//
// If this DLL is dynamically linked against the MFC
// DLLs, any functions exported from this DLL which
// call into MFC must have the AFX_MANAGE_STATE macro
// added at the very beginning of the function.
//
// For example:
//
// extern "C" BOOL PASCAL EXPORT ExportedFunction()
// {
// AFX_MANAGE_STATE(AfxGetStaticModuleState());
// // normal function body here
// }
//
// It is very important that this macro appear in each
// function, prior to any calls into MFC. This means that
// it must appear as the first statement within the
// function, even before any object variable declarations
// as their constructors may generate calls into the MFC
// DLL.
//
// Please see MFC Technical Notes 33 and 58 for additional
// details.
//
/////////////////////////////////////////////////////////////////////////////
// CVbaHelperApp
BEGIN_MESSAGE_MAP(CVbaHelperApp, CWinApp)
//{{AFX_MSG_MAP(CVbaHelperApp)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CVbaHelperApp construction
CVbaHelperApp::CVbaHelperApp()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}
/////////////////////////////////////////////////////////////////////////////
// The one and only CVbaHelperApp object
CVbaHelperApp theApp;
/*----------------------------------------------------------------------+
|
| name mcmMain_GetDocumentIdByFilePath
|
| author BSI 04/2003
|
| Description This function finds document and project
| numbers of the document specified by its path.
|
+----------------------------------------------------------------------*/
extern "C" int mcmMain_GetDocumentIdByFilePath
(
LPWSTR pchFilePath, /* i full file path to search */
long *plProNo, /* o project id */
long *plDocNo /* o document id */
);
/*----------------------------------------------------------------------+
|
| name HooksInitialize
|
| author BSI 04/2003
|
| Description Dll entry function for ProjectWise.
|
+----------------------------------------------------------------------*/
extern "C" LONG HooksInitialize
(
ULONG ulMask, // i Application Mask
LPVOID lpReserved // i Reserved (must be NULL)
)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
return IDOK;
}
/*----------------------------------------------------------------------+
|
| name PWGetDocumentName
|
| author BSI 04/2003
|
| Description A function that will populate documentName for the given
| DOCUMENT_ID.
|
| Return SUCCESS - The path and file name of the specified document
| were built successfully.
|
| -1 - Failed to build the path and file name of the
| specified document.
|
+----------------------------------------------------------------------*/
LONG WINAPI PWGetDocumentName
(
LONG PROJECT_ID, /* i Project ID*/
LONG DOCUMENT_ID, /* i Document ID */
VOID **documentName /* o Document Name*/
)
{
BOOL status = FALSE;
TCHAR tempDocName[MAX_STRING];
// Extract the document's name
status = aaApi_GetDocumentFileName (PROJECT_ID, DOCUMENT_ID, tempDocName, MAX_STRING);
_tcscpy ((TCHAR*)(*documentName), tempDocName);
return (status == TRUE ? SUCCESS : -1);
}
/*----------------------------------------------------------------------+
|
| name PWGetDocumentIDs
|
| author BSI 04/2003
|
| Description A function that will return the document's
| Project and Document IDs.
|
| Return SUCCESS or error number
|
+----------------------------------------------------------------------*/
LONG WINAPI PWGetDocumentIDs
(
TCHAR **fileName, /* i Desgin File Name */
LONG *ProjectID, /* o Project ID */
LONG *DocumentID /* o Document ID */
)
{
return mcmMain_GetDocumentIdByFilePath (*fileName, ProjectID, DocumentID);
}
/*----------------------------------------------------------------------+
|
| name convertCharArrayToLPCWSTR
|
| author MY CUSTOM FUNCTION 10/2015
|
| Description Converts regular string to LPCWSTR, which
| is required by projectwise.
|
| Return The converted string.
|
+----------------------------------------------------------------------*/
wchar_t *convertCharArrayToLPCWSTR(const char* charArray)
{
wchar_t * wString=new wchar_t[4096];
MultiByteToWideChar(CP_ACP, 0, charArray, -1, wString, 4096);
return wString;
}
/*----------------------------------------------------------------------+
|
| name PWCreateDocument
|
| author MY CUSTOM FUNCTION 10/2015
|
| Description A function that will create a new document in the
| specified PW project.
|
| Return SUCCESS or error number
|
+----------------------------------------------------------------------*/
BOOL WINAPI PWCreateDocument
(
LONG PROJECT_ID, /* i Project ID*/
char* PATH_NAME, /* path of document */
char* FILE_NAME /* name of document */
)
{
LONG docID = 0L;
//LONG lngAppID = aaApi_GetFExtensionApplication(L"xwms");
LONG lngAppID = aaApi_GetFExtensionApplication(L"pdf");
LONG lngWorkSpaceID = aaApi_GetWorkspaceProfileId(PROJECT_ID, 0);
LPCWSTR _path_name = convertCharArrayToLPCWSTR(PATH_NAME);
LPCWSTR _file_name = convertCharArrayToLPCWSTR(FILE_NAME);
WCHAR strWorkingDir[_MAX_PATH]; // for checked out file locationmemset (strWorkingDir, '\0', _MAX_PATH);
BOOL status = aaApi_CreateDocument(
&docID, //new document's ID
PROJECT_ID, //Passed in project ID
0, //default
0, //default
0, //default
lngAppID, //Applicaiton ID
0, //no department
lngWorkSpaceID, //workspace profile
_path_name, //source file
_file_name, //Name of file in PW, must be the same as Document Name
_file_name, //Document Name
NULL, //Document description
NULL, //Document Version
FALSE, //Specifies that this document is checked out to the user after it is create in PW.
AADMSDOCCREF_DEFAULT, //Checks documentaiton for flags
//_path_name, //location of the file if checked out
strWorkingDir,
_MAX_PATH - 1, //make sure the buffer is large enough
0 //New attribute ID in environment if created
);
//???
//long errorID=aaApi_GetLastErrorID();
//LPCWSTR errorStr = aaApi_GetLastErrorDetail();
return status;
}
/*----------------------------------------------------------------------+
|
| name PWGetLastErrorMessage
|
| author BSI 04/2003
|
| Description A function that will return the last ProjectWise Error
| message.
|
| Return Last Error message.
|
+----------------------------------------------------------------------*/
char * WINAPI PWGetLastErrorMessage
(
void
)
{
char *errorMsg;
TCHAR TerrorMsg [MAX_STRING];
errorMsg = (char *)malloc (sizeof (char) *MAX_STRING);
_tcscpy (TerrorMsg, aaApi_GetLastErrorMessage());
aaApi_UnicodeToAnsiStr (TerrorMsg, errorMsg,MAX_STRING);
return errorMsg;
}
/*----------------------------------------------------------------------+
|
| name PWGetDocumentAttributes
|
| author BSI 04/2003
|
| Description A function that will return the documents attributes.
|
| Return SUCCESS or -1 if error.
|
+----------------------------------------------------------------------*/
LONG WINAPI PWGetDocumentAttributes
(
LONG ProjectID, /* i Project ID */
LONG DocumentID, /* i Document ID */
void **AttributeData /* o Document attributes */
)
{
CString message;
LONG status = SUCCESS;
LONG lEnvId = aaApi_GetEnvId (0);
LONG lTabNo = aaApi_GetEnvNumericProperty (ENV_PROP_TABLEID, 0);
LONG count = -1;
int rowCount = -1;
/* Select environment for given project */
status = aaApi_SelectEnvByProjectId (ProjectID);
if (status == -1 || status == 0)
{
return -1;
}
else
{
// Select the documents Attribute Data
rowCount = aaApi_SelectLinkDataByObject (
lTabNo, /* i Table identifier (required) */
AADMSLDT_DOCUMENT, /* i Reference Item type */
ProjectID, /* i First item identifier */
DocumentID, /* i Second item identifier */
NULL, /* i Where statement (optional) */
&count, /* io Column count in lplColumnIds */
NULL, /* i Columns to fetch (NULL - all) */
0 /* i Flags (AADMSLDSF_XXX) */
);
if (rowCount <= 0)
return -1;
for (int colIndex= 0; colIndex<count; colIndex++)
{
message += aaApi_GetLinkDataColumnStringProperty (LINKDATA_PROP_COLUMN_NAME, colIndex);
message += ": ";
message += aaApi_GetLinkDataColumnValue (0, colIndex);
message +="\n";
}// end for
_tcscpy ((TCHAR*)(*AttributeData), message);
}
return SUCCESS;
}
/*----------------------------------------------------------------------+
|
| name InitInstance
|
| author BSI 04/2003
|
| Description Initialize the PW API
|
| Return Nonzero if initialization is successful; otherwise 0.
|
+----------------------------------------------------------------------*/
BOOL CVbaHelperApp::InitInstance()
{
// Initialize PW
aaApi_Initialize (AAMODULE_ALL);
return CWinApp::InitInstance();
}
/*----------------------------------------------------------------------+
|
| name ExitInstance
|
| author BSI 04/2003
|
| Description Remove the hook function on exit.
|
| Return 0 for success or > 0 for error.
|
+----------------------------------------------------------------------*/
int CVbaHelperApp::ExitInstance()
{
return CWinApp::ExitInstance();
}
编辑更新 我意识到我的头文件不需要函数definitioins。该项目使用vbaHelper.def文件来定义函数。我从标题中删除了定义，现在有不同的错误：
error C3861: 'PWGetLastErrorMessage': identifier not found
error C3861: 'PWCreateDocument': identifier not found
编辑编号2 我不认为这应该符合其他未解决的外部符号问题的重复，因为我已经检查了这个错误的所有常见原因。此外，我现在已经解决了链接器错误，我正在寻找为什么我会收到“未找到标识符”错误的原因。
答案 0 :(得分：0)
如果您希望能够从c调用它们，则需要使用extern "C"附加函数定义。您已经发布的代码中已经有这样的示例。
extern "C" LONG HooksInitialize
答案 1 :(得分：0)
BOOL WINAPI PWCreateDocument
应该是
BOOL DLLEXPORT PWCreateDocument