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错误 LNK2019：未解析的外部符号“公共：__cdecl

分类：编程问答

如何解决错误 LNK2019：未解析的外部符号“公共：__cdecl

在这里，我尝试使用作为 dll 创建的过敏模块到另一个 dll 模块，我是 MFC 和 VC++ 的新手，我试图调查此问题，但无法得到正确答案，请帮助我解决它。 请查看图片以了解可能的错误：

enter image description here

AllergyDeatails.cpp 模块代码：

 #include "stdafx.h"
    #include "Allergy_Module.h"
    #include "AllergyDetails.h"
    #include "afxdialogex.h"
    #include <string>
    #include "../Patient_Module/Conversion.h"
    #include "../Allergy_Module/Singleton.h"
    
    
    IMPLEMENT_DYNAMIC(CAllergyDetails,CDialogEx)
    
    CAllergyDetails::CAllergyDetails(CWnd* pParent /*=NULL*/)
        : CDialogEx(IDD_ALLERGY_DETAILS,pParent)
    {
    
    }
    
    CAllergyDetails::~CAllergyDetails()
    {
    }
    
    
    
    
    BOOL CAllergyDetails::OnInitDialog()
    {
        CDialog::OnInitDialog();
        CEdit* e = (CEdit*)GetDlgitem(IDC_ALLERGY_NAME);
        e->SetFocus();
        CWnd* pwnd = GetDlgitem(IDC_AN);
        CFont* pfont = pwnd->GetFont();
        LOGFONT lf; pfont->GetLogFont(&lf);
        lf.lfWeight = 5000;
        pfont->CreateFontIndirect(&lf);
        pwnd->SetFont(pfont);
        pwnd = GetDlgitem(IDC_CAT);
        pwnd->SetFont(pfont);
        pwnd = GetDlgitem(IDC_SEV);
        pwnd->SetFont(pfont);           // Todo: Add extra initialization here
        pwnd = GetDlgitem(IDC_IS);
        pwnd->SetFont(pfont);
        pwnd = GetDlgitem(IDC_STAT);
        pwnd->SetFont(pfont);
        return FALSE;  // return TRUE  unless you set the focus to a control
    }
    
    
    
    void CAllergyDetails::DoDataExchange(CDataExchange* pDX)
    {
        CDialogEx::DoDataExchange(pDX);
        DDX_Control(pDX,IDC_CATEGORY,m_CategoryCtrl);
        DDX_Control(pDX,IDC_SEVERITY,m_SeverityCtrl);
        DDX_Control(pDX,IDC_INFO_SOURCE,m_InfoSourceCtrl);
        DDX_Control(pDX,IDC_STATUS,m_StatusCtrl);
        DDX_Control(pDX,IDC_ALLERGY_NAME,m_AllergyNameCtrl);
    }
    
    
    BEGIN_MESSAGE_MAP(CAllergyDetails,CDialogEx)
        ON_BN_CLICKED(IDADD,&CAllergyDetails::OnBnClickedAdd)
        ON_EN_CHANGE(IDC_ALLERGY_NAME,&CAllergyDetails::OnEnChangeAllergyName)
        ON_CBN_SELCHANGE(IDC_CATEGORY,&CAllergyDetails::OnCbnSelchangeCategory)
        ON_CBN_SELCHANGE(IDC_SEVERITY,&CAllergyDetails::OnCbnSelchangeSeverity)
        ON_CBN_SELCHANGE(IDC_INFO_SOURCE,&CAllergyDetails::OnCbnSelchangeInfoSource)
        ON_CBN_SELCHANGE(IDC_STATUS,&CAllergyDetails::OnCbnSelchangeStatus)
    END_MESSAGE_MAP()
    
    
    // CAllergyDetails message handlers
    
    CString sPersonId;
    void CAllergyDetails::OnGetPatientId(CString personId)
    {
        sPersonId = personId;
    }
    
    
    void CAllergyDetails::OnBnClickedAdd()
    {
        // Todo: Add your control notification handler code here
        UpdateData(TRUE);
        if (m_AllergyNameCtrl.GetwindowTextLength() == 0 || m_CategoryCtrl.GetCurSel() < 0 || m_SeverityCtrl.GetCurSel() < 0 || m_InfoSourceCtrl.GetCurSel() < 0 || m_StatusCtrl < 0)
        {
            m_sMesssge.LoadString(IDS_WARNINGMESSAGE);
            m_sCaption.LoadString(IDS_WARNINGCAPTION);
            ::MessageBox(NULL,m_sMesssge,m_sCaption,MB_ICONWARNING);
        }
        else
        {
            CString sAllergyName;
            m_AllergyNameCtrl.GetwindowText(sAllergyName);
            CString sAllergyCategory;
            m_CategoryCtrl.GetwindowText(sAllergyCategory);
            CString sAllergySeverity;
            m_SeverityCtrl.GetwindowText(sAllergySeverity);
            CString sAllergyInfoSource;
            m_InfoSourceCtrl.GetwindowText(sAllergyInfoSource);
            CString sAllergyStatus;
            m_StatusCtrl.GetwindowText(sAllergyStatus);
    
            CSingleton* stb;
            stb = CSingleton::getInstance();
            try
            {
                std::string ssqlString = "INSERT INTO allergies_table VALUES ('" + ConvertCStringToString(sAllergyName) + "','" + ConvertCStringToString(sAllergyCategory) + "','" + ConvertCStringToString(sAllergySeverity) + "','" + ConvertCStringToString(sAllergyInfoSource) + "','" + ConvertCStringToString(sPersonId) + "','" + ConvertCStringToString(sAllergyStatus) + "')";
                stb->Executesql(ConvertStringToCString(ssqlString));
                EndDialog(0);
            }
            catch (CDBException* e)
            {
                OutputDebugString(e->m_strError);
            }
        }
    }
    
    //****OnEnChangeAllergyName****
    
    void CAllergyDetails::OnEnChangeAllergyName()
    {
        
    
        // Todo:  Add your control notification handler code here
        CWnd* pwnd = GetDlgitem(IDC_AN);
        CFont* pfont = pwnd->GetFont();
        LOGFONT lf; pfont->GetLogFont(&lf);
    
        int nLength = m_AllergyNameCtrl.GetwindowTextLength();
        if (nLength > 0)
        {
            lf.lfWeight = 500;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Allergy Name:"));
        }
        else
        {
            lf.lfWeight = 5000;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Allergy Name*:"));
        }
    }
    
    
    void CAllergyDetails::OnCbnSelchangeCategory()
    {
        // Todo: Add your control notification handler code here
        CWnd* pwnd = GetDlgitem(IDC_CAT);
        CFont* pfont = pwnd->GetFont();
        LOGFONT lf; pfont->GetLogFont(&lf);
    
        int nPosition = m_CategoryCtrl.GetCurSel();
        if (nPosition >= 0)
        {
            lf.lfWeight = 500;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Category:"));
        }
        else
        {
            lf.lfWeight = 5000;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Category*:"));
        }
    }
    
    
    void CAllergyDetails::OnCbnSelchangeSeverity()
    {
        // Todo: Add your control notification handler code here
        CWnd* pwnd = GetDlgitem(IDC_SEV);
        CFont* pfont = pwnd->GetFont();
        LOGFONT lf; pfont->GetLogFont(&lf);
    
        int nPosition = m_SeverityCtrl.GetCurSel();
        if (nPosition >= 0)
        {
            lf.lfWeight = 500;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Severity:"));
        }
        else
        {
            lf.lfWeight = 5000;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Severity*:"));
        }
    }
    
    
    void CAllergyDetails::OnCbnSelchangeInfoSource()
    {
        // Todo: Add your control notification handler code here
        CWnd* pwnd = GetDlgitem(IDC_IS);
        CFont* pfont = pwnd->GetFont();
        LOGFONT lf; pfont->GetLogFont(&lf);
    
        int nPosition = m_CategoryCtrl.GetCurSel();
        if (nPosition >= 0)
        {
            lf.lfWeight = 500;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Info_Source:"));
        }
        else
        {
            lf.lfWeight = 5000;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Info_Source*:"));
        }
    }
    
    
    void CAllergyDetails::OnCbnSelchangeStatus()
    {
        // Todo: Add your control notification handler code here
        CWnd* pwnd = GetDlgitem(IDC_STAT);
        CFont* pfont = pwnd->GetFont();
        LOGFONT lf; pfont->GetLogFont(&lf);
    
        int nPosition = m_StatusCtrl.GetCurSel();
        if (nPosition >= 0)
        {
            lf.lfWeight = 500;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Status:"));
        }
        else
        {
            lf.lfWeight = 5000;
            pfont->CreateFontIndirect(&lf);
            pwnd->SetFont(pfont);
            pwnd->SetwindowTextW(_T("Status*:"));
        }
    }

PatientDeatil 模块代码：

**PatientDetails.cpp : implementation file**


#include "stdafx.h"
#include "Patient_Module.h"
#include "PatientDetails.h"
#include "afxdialogex.h"
#include "odbcinst.h"
#include "afxdb.h"
#include "../Patient_Module/PatientRegistrationDlg.h"
#include "../Allergy_Module/AllergyDetails.h"
#include "../Allergy_Module/UIExportAllergy.h"
#include "../Patient_Module/PatientSearch.h"
#include "../Patient_Module/Singleton.h"

IMPLEMENT_DYNAMIC(CPatientDetails,CDialogEx)

CPatientDetails::CPatientDetails(CWnd* pParent /*=NULL*/)
    : CDialogEx(IDD_PatientDetails,pParent)
{
}



CPatientDetails::~CPatientDetails()
{

}

//****OnInitDialog****
//purpose - this method will create the patient information window
//argument - void
//return - boolean
//preconditions - none
//postconditions - none
BOOL CPatientDetails::OnInitDialog()
{
    CDialogEx::OnInitDialog();
    m_brush.CreateSolidBrush(RGB(30,144,255));
    return TRUE;
}



void CPatientDetails::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
    DDX_Control(pDX,IDC_Name,m_NameCtrl);
    DDX_Control(pDX,IDC_dob,m_dobCtrl);
    DDX_Control(pDX,IDC_Gender,m_GenderCtrl);
    DDX_Control(pDX,IDC_MRN,m_MrnCtrl);
    DDX_Control(pDX,IDC_EncounterType,m_EncounterCtrl);
    DDX_Control(pDX,IDC_ALLERGYLIST,m_AllergyListCtrl);
    DDX_Control(pDX,IDC_ADD,m_AddButtonCtrl);
    DDX_Control(pDX,IDC_CancelButton,m_btCancel);
}


BEGIN_MESSAGE_MAP(CPatientDetails,CDialogEx)
    ON_COMMAND(ID_PatientDetails_ADD,&CPatientDetails::OnAddPatientDetail)
    ON_COMMAND(ID_PatientDetails_Search,&CPatientDetails::OnSearchPatientDetail)
    ON_BN_CLICKED(IDC_ADD,&CPatientDetails::OnBnClickedAdd)
    ON_BN_CLICKED(IDC_CancelButton,&CPatientDetails::OnBnClickedCancelbutton)
END_MESSAGE_MAP()


// CPatientDetails message handlers
//****OnCtlColor****
//purpose - It will create a background color of the admin login dialog Box
//arguments - CDC,CWnd,UINT
//returns - HBrush
//preconditions - none
//postconditions - none
HBrush CPatientDetails::OnCtlColor(CDC* pDC,CWnd* pWnd,UINT nCtlColor)
{
    CBrush m_brBack;
    HBrush hbr = CDialog::OnCtlColor(pDC,pWnd,nCtlColor);
    CDialogEx::OnCtlColor(pDC,nCtlColor);
    pDC->SetBkMode(TRANSPARENT);
    hbr = ::CreateSolidBrush(RGB(30,255));
    return hbr;
}

//****OnAddPatientDetail****
//Purpose - This method will call to create the patient registration window
//argument - None
//returns - None 
//preconditions - None
//postconditions - None
void CPatientDetails::OnAddPatientDetail()
{
    // Todo: Add your command handler code here
    CPatientRegistrationDlg patientReg;
    patientReg.DoModal();
}

//****OnSearchPatientDetail****
//Purpose - This method will call to create the patient search window and set the details to the respecting fields and also activate the add button
//argument - None
//returns - None 
//preconditions - None
//postconditions - None
void CPatientDetails::OnSearchPatientDetail()
{
    // Todo: Add your command handler code here
    CPatientSearch patientSearch;
    patientSearch.DoModal();
    SetPatientName(patientSearch.GetPatientName());
    SetPatientEncounter(patientSearch.GetPatientEncounter());
    SetPatientdob(patientSearch.GetPatientdob());
    SetPatientGender(patientSearch.GetPatientGender());
    SetPatinetMrn(patientSearch.GetPatientMrn());
    m_sPersonId = patientSearch.GetPatientId();
    setPatientId(m_sPersonId);
    m_AddButtonCtrl.EnableWindow(TRUE);
    m_AllergyListCtrl.GetSelectedColumn();
}



//****OnAllergyDetailsSearch****
//Purpose - This method will search the details of allergy of the selected person
//argument - None
//returns - boolean 
//preconditions - None
//postconditions - None
BOOL CPatientDetails::OnAllergyDetailsSearch()
{
    CString sMessage;
    CString sCaption;
    int nAllergyRowCount = 0;
    int irec = 0;
    CString sAllergyId,sAllergyName,sCategory,sSeverity,sInfo_Source,sstatus,sPersonId;
    ResetListControl();
    sAllergyName.LoadString(IDS_ALLERGYNAME);
    sCategory.LoadString(IDS_ALLERGYCATEGORY);
    sSeverity.LoadString(IDS_ALLERGYSEVERITY);
    sInfo_Source.LoadString(IDS_ALLERGYSOURCE);
    sstatus.LoadString(IDS_ALLERGYSTATUS);
    ListView_SetExtendedListViewStyle(m_AllergyListCtrl,LVS_EX_GRIDLInes);
    m_AllergyListCtrl.InsertColumn(0,LVCFMT_CENTER,200);
    m_AllergyListCtrl.InsertColumn(1,200);
    m_AllergyListCtrl.InsertColumn(2,200);
    m_AllergyListCtrl.InsertColumn(3,200);
    m_AllergyListCtrl.InsertColumn(4,200);

    CSingLeton* st;
    st = CSingLeton::getInstance();
    if (!m_sPersonId.IsEmpty())
    {
        try
        {
            CRecordset recest(st);
            CString ssqlString = L"Select * from allergies_table where Person_ID = '" + m_sPersonId + L"'";
            recest.Open(CRecordset::forwardOnly,ssqlString,CRecordset::readOnly);
            while (!recest.ISEOF())
            {
                nAllergyRowCount++;
                if (nAllergyRowCount > 0)
                {
                    recest.GetFieldValue(_T("Allergy_Id"),sAllergyId);
                    recest.GetFieldValue(_T("Allergy_Name"),sAllergyName);
                    recest.GetFieldValue(_T("Category"),sCategory);
                    recest.GetFieldValue(_T("Severity"),sSeverity);
                    recest.GetFieldValue(_T("Info_Source"),sInfo_Source);
                    recest.GetFieldValue(_T("Person_ID"),sPersonId);
                    recest.GetFieldValue(_T("Status"),sstatus);

                    irec = m_AllergyListCtrl.InsertItem(0,sAllergyName);
                    m_AllergyListCtrl.SetItemText(irec,1,sCategory);
                    m_AllergyListCtrl.SetItemText(irec,2,sSeverity);
                    m_AllergyListCtrl.SetItemText(irec,3,sInfo_Source);
                    m_AllergyListCtrl.SetItemText(irec,4,sstatus);
                    recest.MoveNext();
                }
            }
            if (nAllergyRowCount == 0)
            {
                sMessage.LoadString(IDS_ALLERGYDATA);
                sCaption.LoadString(IDS_WARNINGCAPTION);
                ::MessageBox(this->GetSafeHwnd(),sMessage,sCaption,MB_ICONWARNING);
            }
        }
        catch (CDBException* e)
        {
            OutputDebugString(e->m_strError);
        }
    }
    return 0;
}

//****ResetListControl****
//Purpose - This method will reset the list of the allergy 
//argument - void
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::ResetListControl()
{
    m_AllergyListCtrl.DeleteallItems();
    int iNbrofColumns;
    CHeaderCtrl* pHeader = (CHeaderCtrl*)m_AllergyListCtrl.GetDlgitem(0);
    if (pHeader)
    {
        iNbrofColumns = pHeader->GetItemCount();
    }
    for (int i = iNbrofColumns; i >= 0; i--)
    {
        m_AllergyListCtrl.DeleteColumn(i);
    }
}

//****OnBnClickedAdd****
//Purpose - This method will send the person id first to the allergy detail class and then it will call UIExportAllergy class to create the allergy details window 
//argument - void
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::OnBnClickedAdd()
{
    CAllergyDetails allergyDetails;
    allergyDetails.OnGetPatientId(m_sPersonId);
    CUIExportAllergy exportAllergy;
    exportAllergy.CreateComponent();
    OnAllergyDetailsSearch();
}

//****OnBnClickedCancelbutton****
//Purpose - This method will close the patient information window
//argument - void
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::OnBnClickedCancelbutton()
{
    /* Todo: Add your control notification handler code here*/
    EndDialog(0);
}

//****SetPatientName****
//Purpose - This method will set the patient name in the patient information
//argument - CString
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::SetPatientName(CString sPatient)
{
    m_NameCtrl.SetwindowText(sPatient);
}

//****SetPatientEncounter****
//Purpose - this method will set the patient encounter type in the patient information
//argument - CString
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::SetPatientEncounter(CString sEncounter)
{
    m_EncounterCtrl.SetwindowText(sEncounter);
}

//****SetPatientMrn****
//Purpose - this method will set the patient mrn in the patient information
//argument - CString
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::SetPatinetMrn(CString sMrn)
{
    m_MrnCtrl.SetwindowText(sMrn);
}

//****SetPatientdob****
//Purpose - this method will set the patient date of birth in the patient information
//argument - CString
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::SetPatientdob(CString sdob)
{
    m_dobCtrl.SetwindowText(sdob);
}

//****SetPatientGender****
//Purpose - this method will set the patient gender in the patient information
//argument - CString
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::SetPatientGender(CString sGender)
{
    m_GenderCtrl.SetwindowText(sGender);
}

//****setPatientId****
//Purpose - this method will send the person id to search the details of allergy
//argument - CString
//returns - void 
//preconditions - None
//postconditions - None
void CPatientDetails::setPatientId(CString sPersonId)
{
    OnAllergyDetailsSearch();
}

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