dlgfloat.cpp

vc6.0完整版

// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"
#include <float.h>              // floating point precision

#ifdef AFX_CORE3_SEG
#pragma code_seg(AFX_CORE3_SEG)
#endif

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

/////////////////////////////////////////////////////////////////////////////
// Extra data validation procs for float/double support
//  see "dlgdata.cpp" for non-floating point support
/////////////////////////////////////////////////////////////////////////////

AFX_STATIC BOOL AFXAPI _AfxSimpleFloatParse(LPCTSTR lpszText, double& d)
{
	ASSERT(lpszText != NULL);
	while (*lpszText == ' ' || *lpszText == '\t')
		lpszText++;

	TCHAR chFirst = lpszText[0];
	d = _tcstod(lpszText, (LPTSTR*)&lpszText);
	if (d == 0.0 && chFirst != '0')
		return FALSE;   // could not convert
	while (*lpszText == ' ' || *lpszText == '\t')
		lpszText++;

	if (*lpszText != '\0')
		return FALSE;   // not terminated properly

	return TRUE;
}

void AFXAPI AfxTextFloatFormat(CDataExchange* pDX, int nIDC,
	void* pData, double value, int nSizeGcvt)
{
	ASSERT(pData != NULL);

	HWND hWndCtrl = pDX->PrepareEditCtrl(nIDC);
	TCHAR szBuffer[32];
	if (pDX->m_bSaveAndValidate)
	{
		::GetWindowText(hWndCtrl, szBuffer, _countof(szBuffer));
		double d;
		if (!_AfxSimpleFloatParse(szBuffer, d))
		{
			AfxMessageBox(AFX_IDP_PARSE_REAL);
			pDX->Fail();            // throws exception
		}
		if (nSizeGcvt == FLT_DIG)
			*((float*)pData) = (float)d;
		else
			*((double*)pData) = d;
	}
	else
	{
		_stprintf(szBuffer, _T("%.*g"), nSizeGcvt, value);
		AfxSetWindowText(hWndCtrl, szBuffer);
	}
}

void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, float& value)
{
	AfxTextFloatFormat(pDX, nIDC, &value, value, FLT_DIG);
}

void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, double& value)
{
	AfxTextFloatFormat(pDX, nIDC, &value, value, DBL_DIG);
}

/////////////////////////////////////////////////////////////////////////////
// Validation procs

AFX_STATIC void AFXAPI _AfxFailMinMaxReal(CDataExchange* pDX,
	 double minVal, double maxVal, int precision, UINT nIDPrompt)
	// error string must have '%1' and '%2' in it
{
	if (!pDX->m_bSaveAndValidate)
	{
		TRACE0("Warning: initial dialog data is out of range.\n");
		return;         // don't stop now
	}
	TCHAR szMin[32], szMax[32];
	CString prompt;

	_stprintf(szMin, _T("%.*g"), precision, minVal);
	_stprintf(szMax, _T("%.*g"), precision, maxVal);
	AfxFormatString2(prompt, nIDPrompt, szMin, szMax);

	AfxMessageBox(prompt, MB_ICONEXCLAMATION, nIDPrompt);
	prompt.Empty(); // exception prep
	pDX->Fail();
}

void AFXAPI DDV_MinMaxFloat(CDataExchange* pDX, float const& value, float minVal, float maxVal)
{
	ASSERT(minVal <= maxVal);
	if (value < minVal || value > maxVal)
		_AfxFailMinMaxReal(pDX, (double)minVal, (double)maxVal, FLT_DIG,
			AFX_IDP_PARSE_REAL_RANGE);
}

void AFXAPI DDV_MinMaxDouble(CDataExchange* pDX, double const& value, double minVal, double maxVal)
{
	ASSERT(minVal <= maxVal);
	if (value < minVal || value > maxVal)
		_AfxFailMinMaxReal(pDX, (double)minVal, (double)maxVal, DBL_DIG,
			AFX_IDP_PARSE_REAL_RANGE);
}

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