error C2664: 'int LSexecuteScriptLng(void ,const char )

Question

// Salam001Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Salam001.h"
#include "Salam001Dlg.h"
#include "DlgProxy.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CSalam001Dlg dialog


IMPLEMENT_DYNAMIC(CSalam001Dlg, CDialogEx);

CSalam001Dlg::CSalam001Dlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CSalam001Dlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    m_pAutoProxy = NULL;
}

CSalam001Dlg::~CSalam001Dlg()
{
    // If there is an automation proxy for this dialog, set
    //  its back pointer to this dialog to NULL, so it knows
    //  the dialog has been deleted.
    if (m_pAutoProxy != NULL)
        m_pAutoProxy->m_pDialog = NULL;
}

void CSalam001Dlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CSalam001Dlg, CDialogEx)
    ON_WM_CLOSE()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
END_MESSAGE_MAP()


// CSalam001Dlg message handlers

BOOL CSalam001Dlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);         // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here

    return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CSalam001Dlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CSalam001Dlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}

// Automation servers should not exit when a user closes the UI
//  if a controller still holds on to one of its objects.  These
//  message handlers make sure that if the proxy is still in use,
//  then the UI is hidden but the dialog remains around if it
//  is dismissed.

void CSalam001Dlg::OnClose()
{
    if (CanExit())
        CDialogEx::OnClose();
}

void CSalam001Dlg::OnOK()
{//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    int nError, nPointersNow;
    double dStatus, dn_Mu, dSol_Inv, dSol_Rot;
    CString csScript, cs;

    // Get user's staffing requirements from our dialog box
    //UpdateData();

    // Load staffing requirements into the LINGO transfer array.
    // LINGO uses double precision for all values.
    dn_Mu = 5.0;
    //n_Mu[0] = (double)n_Mu;


    // create the LINGO environment object
    pLSenvLINGO pLINGO;
    pLINGO = LScreateEnvLng();
    if (!pLINGO)
    {
        AfxMessageBox(_T("Unable to create LINGO Environment"));
        return;
    }

    // Open LINGO's log file  
    nError = LSopenLogFileLng(pLINGO, "C:\\LINGO8\\LINGO.log");
    if (nError) goto ErrorExit;

    // Pass memory transfer pointers to LINGO
    // @POINTER(1)
    nError = LSsetPointerLng(pLINGO, &dn_Mu, &nPointersNow);
    if (nError) goto ErrorExit;
    // @POINTER(2)
    nError = LSsetPointerLng(pLINGO, &dSol_Inv, &nPointersNow);
    if (nError) goto ErrorExit;
    // @POINTER(3)
/*  nError = LSsetPointerLng(pLINGO, &dSol_Rot, &nPointersNow);
    if (nError) goto ErrorExit;
*/
    // @POINTER(3)
    nError = LSsetPointerLng(pLINGO, &dStatus, &nPointersNow);
    if (nError) goto ErrorExit;

    // Here is the script we want LINGO to run
    csScript = L"SET ECHOIN 1\n";
    csScript = csScript + L"TAKE \\Salam002\\LINGO1-3.LNG\n"    ;
    csScript = csScript + L"GO\n";
    csScript = csScript + L"QUIT\n";

    // Run the script
    dStatus = -1.e0;
    nError = LSexecuteScriptLng(pLINGO, ( LPCTSTR ) csScript);

    // Close the log file
    LScloseLogFileLng(pLINGO);

    // Any problems?
    if (nError || dStatus)
    {

        // Had a problem   
        AfxMessageBox( _T("Unable to solve!"));

    }
    else {

        // Everything went ok ... load results into the dialog box
    //  m_csStartMon.Format("%d", (int)dStart[0]);


        UpdateData(FALSE);

    }

    goto Exit;

ErrorExit:
    cs.Format(_T("LINGO Errorcode: %d"), nError);
    AfxMessageBox(cs);
    return;

Exit:
    LSdeleteEnvLng(pLINGO);

/////////////////////////////////////////////////////////////////////////////////////////////////////////

}

void CSalam001Dlg::OnCancel()
{
    if (CanExit())
        CDialogEx::OnCancel();
}

BOOL CSalam001Dlg::CanExit()
{
    // If the proxy object is still around, then the automation
    //  controller is still holding on to this application.  Leave
    //  the dialog around, but hide its UI.
    if (m_pAutoProxy != NULL)
    {
        ShowWindow(SW_HIDE);
        return FALSE;
    }

    return TRUE;
}

I need help to fix the problem in the following line :

nError = LSexecuteScriptLng(pLINGO, ( LPCTSTR ) csScript);

the error message is :

error C2664: 'int LSexecuteScriptLng(void *,const char )' : cannot convert argument 2 from 'LPCTSTR' to 'const char

Please help me.

Declare csScript as CStringA (A for ASCII, as opposed to Unicode), drop all Ls in front of string literals, as in csScript = "SET ECHOIN 1\n";, and in LSexecuteScriptLng call, cast to LPCSTR (note no T). The function wants an ASCII string, not a Unicode string. — Igor Tandetnik

Ajay Ajay · Accepted Answer · 2016-02-02T07:00:09

It simply means what is says: you cannot convert a 2-byte-character to a one-byte character. You need to declare and use all of char variables. Since your project settings are set to Unicode, TCHAR would map to char, and also CString would map to CStringW. You have options:

Declare all needed variables to be char (or derivation of char, for example CStringA)
(Not advised) is to change project settings to use Multi-byte.
DON'T ever forcefully type cast it. It like forcing a float* to and int* - wont work!

See this article

error C2664: 'int LSexecuteScriptLng(void *,const char *)

2 Answers

error C2664: 'int LSexecuteScriptLng(void ,const char )