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我不知道为什么我会收到这个错误。我猜这是因为我没有实现一个功能。

错误： Error 2 error LNK2019: unresolved external symbol "private: void __thiscall CGKPRDlg::DisplayError(unsigned long)" (?DisplayError@CGKPRDlg@@AAEXK@Z) referenced in function "public: void __thiscall CGKPRDlg::OnBnClickedDevOpen(void)"

这里是我调用函数的地方：

void CGKPRDlg::OnBnClickedDevOpen()
{

if (!m_hBSP)
    return;

SecuAPI_DEVICE_ID deviceID;

UpdateData(true);

int index = m_deviceList.GetCurSel();
if (index == 0) // Auto detect
    deviceID = SecuAPI_DEVICE_ID_AUTO;
else
    deviceID = g_DeviceIDs[index - 1];

SecuAPI_CloseDevice(m_hBSP, m_DeviceID);

m_DeviceID = deviceID;
SecuAPI_RETURN err = SecuAPI_OpenDevice(m_hBSP, m_DeviceID);

if (err)
    DisplayError(err);                    <---------------------------HERE
else
{
    m_StatusBar = _T("Function success - [Open Device]");

    // Enroll & Verify button enable.
    m_enroll.EnableWindow(TRUE);
    m_verify.EnableWindow(TRUE);

    bool is_autoon_dev = false;
    SecuAPI_DEVICE_ID dev_id = SecuAPI_GetOpenedDeviceID(m_hBSP) & 0x00ff;

    if (m_DeviceID == SecuAPI_DEVICE_ID_AUTO)
        dev_id = SecuAPI_GetOpenedDeviceID(m_hBSP) & 0x00ff;
    else
        dev_id = m_DeviceID & 0x00ff;

    is_autoon_dev = ((dev_id == SecuAPI_DEVICE_NAME_FDU03) || (dev_id == SecuAPI_DEVICE_NAME_FDU04) || (dev_id == SecuAPI_DEVICE_NAME_FDU05)) ?
        true : false;

    m_chkMonitorDevice.EnableWindow(is_autoon_dev);
    m_chkMonitorDevice.SetCheck(BST_UNCHECKED);
}

UpdateData(false);

}

以及我在包含在 cpp 文件中的头文件中创建它的位置：

private:
    void DisplayError(SecuAPI_RETURN errCode);

我知道这很多，但只是想付出足够的努力。

编辑：这是一个包含的 .h 文件，我猜它定义了一堆函数。因为这个，我猜现在这是一个库链接问题。我猜它是在我没有链接的他们的某个库中定义的。

SecuAPI_RETURN SecuAPI SecuAPI_EnumerateDevice(SecuAPI_HANDLE hHandle, SecuAPI_UINT32* pNumDevice, SecuAPI_DEVICE_ID** ppDeviceID); SecuAPI_RETURN SecuAPI SecuAPI_OpenDevice (SecuAPI_HANDLE hHandle, SecuAPI_DEVICE_ID nDeviceID); SecuAPI_RETURN SecuAPI SecuAPI_CloseDevice (SecuAPI_HANDLE hHandle, SecuAPI_DEVICE_ID nDeviceID); SecuAPI_RETURN SecuAPI SecuAPI_GetDeviceInfo (SecuAPI_HANDLE hHandle, SecuAPI_DEVICE_ID nDeviceID, SecuAPI_UINT8 nStructureType, SecuAPI_DEVICE_INFO_PTR pDeviceInfo); SecuAPI_RETURN SecuAPI SecuAPI_SetDeviceInfo (SecuAPI_HANDLE hHandle, SecuAPI_DEVICE_ID nDeviceID, SecuAPI_UINT8 nStructureType, SecuAPI_DEVICE_INFO_PTR pDeviceInfo); SecuAPI_RETURN SecuAPI SecuAPI_AdjustDevice (SecuAPI_HANDLE hHandle, const SecuAPI_WINDOW_OPTION_PTR pWindowOption); SecuAPI_DEVICE_ID SecuAPI SecuAPI_GetOpenedDeviceID(SecuAPI_HANDLE hHandle);

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