How to get parameters of curve?

huangyhg

How to get parameters of curve
APITest_EXE.zip
[size=-2]Updated: 5/7/2004
Size: 0.019

Curve::GetBCurveParams is a difficult API to use because you must deal with Variants.

This sample code is an MFC-based dialog application that shows how to use Curve::GetBCurveParams. It shows how to correctly deal with Variants and access the data contained in a Variant. The equivalent VBA code is provided for reference and contrast.

huangyhg

// APITest_EXEDlg.cpp : implementation file
//

#include "stdafx.h"
#include "APITest_EXE.h"
#include "APITest_EXEDlg.h"
#include "smartvars.h" //Header for SolidWorks' SAFEARRAY template classes

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg:oDataExchange(CDataExchange* pDX)
{
CDialog:oDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAPITest_EXEDlg dialog

CAPITest_EXEDlg::CAPITest_EXEDlg(CWnd* pParent /*=NULL*/)
: CDialog(CAPITest_EXEDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CAPITest_EXEDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CAPITest_EXEDlg:oDataExchange(CDataExchange* pDX)
{
CDialog:oDataExchange(pDX);
//{{AFX_DATA_MAP(CAPITest_EXEDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAPITest_EXEDlg, CDialog)
//{{AFX_MSG_MAP(CAPITest_EXEDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BTN_CONNECT, OnBtnConnect)
ON_BN_CLICKED(IDC_BTN_DATE, OnBtnDate)
ON_BN_CLICKED(IDC_BTN_START, OnBtnStart)
ON_BN_CLICKED(IDC_BTN_API_TEST, OnBtnAPI_Test)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAPITest_EXEDlg message handlers

BOOL CAPITest_EXEDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// 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
}

void CAPITest_EXEDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID + 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

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

SendMessage(WM_ICONERASEBKGND, (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
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CAPITest_EXEDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
//------------------------------------------------------------------------

void CAPITest_EXEDlg::OnBtnConnect()
{
// connects to an already running instance of SW
// will assert if SW has not been started

CComPtr <IUnknown> pUnk;
CComQIPtr <IDispatch> pSldWorks;
CLSID clsid;
HRESULT hr = S_OK;

hr = CLSIDFromProgID(OLESTR("SldWorks.Application"), &clsid);
ASSERT(S_OK == hr);

hr = GetActiveObject(clsid, NULL, &pUnk);
ASSERT(S_OK == hr);
ASSERT(pUnk);

pSldWorks = pUnk;
ASSERT(pSldWorks);

// Detach since m_pSldWorks will Release when it goes out of scope
m_pSldWorks.AttachDispatch(pSldWorks.Detach());
}
//------------------------------------------------------------------------
void CAPITest_EXEDlg::OnBtnStart()
{
// connects to an already running instance of SW
// or will start SW if not already running
m_pSldWorks.CreateDispatch("SldWorks.Application");
ASSERT(m_pSldWorks.m_lpDispatch);
}
//------------------------------------------------------------------------
void CAPITest_EXEDlg::OnBtnDate()
{
ASSERT(m_pSldWorks.m_lpDispatch);

long nDateCode = -1;
CComBSTR sRevNum;
CString sMsg;

sRevNum = m_pSldWorks.RevisionNumber();
nDateCode = m_pSldWorks.DateCode();

// note upper case S format specifier since CComBSTR is Unicode
sMsg.Format("Revision Number = %ld\nDate Code = %S", nDateCode, sRevNum);

AfxMessageBox(sMsg);
}
//------------------------------------------------------------------------
void CAPITest_EXEDlg::OnBtnAPI_Test()
{
union Ints
{
double value;
int intval[2];
};


HRESULT hr = S_OK;
IModeler pModeler;
IModelDoc2 pModel;
ISelectionMgr pSelMgr;
IEdge pEdge;
ICurve pCurve;
BOOL bRet = FALSE;
VARIANT vBCurveParam;
long lUBound = -1;
Ints iDim_Order;
Ints iCtrlPts_Periodicity;
long nNumKnots = -1;
CString sTempStr;
int i = -1;

VariantInit(&vBCurveParam);
vBCurveParam.vt = VT_ARRAY | VT_R8;

pModeler = m_pSldWorks.GetModeler();
ASSERT(pModeler.m_lpDispatch);

pModel = m_pSldWorks.GetActiveDoc();
ASSERT(pModel.m_lpDispatch);

pSelMgr = pModel.GetSelectionManager();
ASSERT(pSelMgr.m_lpDispatch);

pEdge = pSelMgr.GetSelectedObject5(1);
ASSERT(pEdge.m_lpDispatch);

pCurve = pEdge.GetCurve();
ASSERT(pCurve.m_lpDispatch);

vBCurveParam = pCurve.GetBCurveParams(TRUE);
ASSERT(VT_EMPTY != vBCurveParam.vt);
ASSERT(VT_ARRAY | VT_R8 == vBCurveParam.vt);

hr = SafeArrayGetUBound(vBCurveParam.parray, 1, &lUBound);
ASSERT(S_OK == hr);
ASSERT(lUBound > 0);

SafeDoubleArray sdaData(lUBound);

sdaData = vBCurveParam;


// dump modeller settings
OutputDebugString("Modeller Settings:\n");
sTempStr.Format(" BSCurveOutputTol = %f\n", pModeler.GetToleranceValue(swBSCurveOutputTol)); OutputDebugString(sTempStr);
sTempStr.Format(" BSCurveNonRationalOutputTol = %f\n", pModeler.GetToleranceValue(swBSCurveNonRationalOutputTol)); OutputDebugString(sTempStr);
sTempStr.Format(" UVCurveOutputTol = %f\n", pModeler.GetToleranceValue(swUVCurveOutputTol)); OutputDebugString(sTempStr);
sTempStr.Format(" SurfChordTessellationTol = %f\n", pModeler.GetToleranceValue(swSurfChordTessellationTol)); OutputDebugString(sTempStr);
sTempStr.Format(" SurfAngularTessellationTol = %f\n", pModeler.GetToleranceValue(swSurfAngularTessellationTol)); OutputDebugString(sTempStr);
sTempStr.Format(" CurveChordTessellationTol = %f\n", pModeler.GetToleranceValue(swCurveChordTessellationTol)); OutputDebugString(sTempStr);
OutputDebugString("\n");


iDim_Order.value = sdaData[0];
iCtrlPts_Periodicity.value = sdaData[1];
nNumKnots = iDim_Order.intval[1] + iCtrlPts_Periodicity.intval[0];

sTempStr.Format("File = %s\n", pModel.GetPathName()); OutputDebugString(sTempStr);
sTempStr.Format(" Dimension = %d\n", iDim_Order.intval[0]); OutputDebugString(sTempStr);
sTempStr.Format(" Order = %d\n", iDim_Order.intval[1]); OutputDebugString(sTempStr);
sTempStr.Format(" Num Ctrl Pts = %d\n", iCtrlPts_Periodicity.intval[0]); OutputDebugString(sTempStr);
sTempStr.Format(" Periodicity = %d\n", iCtrlPts_Periodicity.intval[1]); OutputDebugString(sTempStr);
sTempStr.Format(" Num Knots = %d\n", nNumKnots); OutputDebugString(sTempStr);
OutputDebugString("\n");

for (i = 0; i < nNumKnots; i++)
{
// knot weights should be increasing monotonically
sTempStr.Format(" Knot(%d) = %f\n", i, sdaData[2 + i]); OutputDebugString(sTempStr);
}

if (3 == iDim_Order.intval[0])
{
for (i = 2 + nNumKnots; i < lUBound; i = i + 3)
{
sTempStr.Format(" Ctrl(%d) = (%f, %f, %f) mm\n",
(i - 2 - nNumKnots) / 3,
sdaData[i + 0] * 1000.0,
sdaData[i + 1] * 1000.0,
sdaData[i + 2] * 1000.0); OutputDebugString(sTempStr);
}
}
else
{
// WARNING - untested code!
for (i = 2 + nNumKnots; i < lUBound; i = i + 4)
{
sTempStr.Format(" Ctrl(%d) = (%f, %f, %f) mm [%f]\n",
(i - 2 - nNumKnots) / 4,
sdaData[i + 0] * 1000.0,
sdaData[i + 1] * 1000.0,
sdaData[i + 2] * 1000.0,
sdaData[i + 3]); OutputDebugString(sTempStr);
}
}
}