dbview.cpp

c语言编程软件vc6.0中文绿色版_vc6.0官方下载

	{
		int nIndex = (int)::SendMessage(hWndCtrl, LB_GETCURSEL, 0, 0L);
		if (nIndex != -1)
		{
			int nLen = (int)::SendMessage(hWndCtrl, LB_GETTEXTLEN, nIndex, 0L);
			if (nLen > value.GetAllocLength())
				AfxFailMaxChars(pDX, value.GetAllocLength());
			::SendMessage(hWndCtrl, LB_GETTEXT, nIndex,
					(LPARAM)(LPSTR)value.GetBuffer(0));
			if (nLen == 0)
			{
				if (pRecordset->IsFieldNullable(&value))
					pRecordset->SetFieldNull(&value, TRUE);
			}
			else
			{
				pRecordset->SetFieldNull(&value, FALSE);
			}
			value.ReleaseBuffer();
		}
		else
		{
			// no selection
			value.GetBufferSetLength(0);
			if (pRecordset->IsFieldNullable(&value))
				pRecordset->SetFieldNull(&value);
		}
	}
	else
	{
		if (!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value))
		{
			SendMessage(hWndCtrl, LB_SETCURSEL, (WPARAM)-1, 0L);
		}
		else
		{
			// set current selection based on data string
			if (::SendMessage(hWndCtrl, LB_SELECTSTRING, (WPARAM)-1,
			  (LPARAM)(LPCTSTR)value) == LB_ERR)
			{
				// no selection match
				TRACE0("Warning: no listbox item selected.\n");
			}
		}
	}
}

void AFXAPI DDX_FieldLBStringExact(CDataExchange* pDX, int nIDC, CString& value,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
	if (pDX->m_bSaveAndValidate)
	{
		DDX_FieldLBString(pDX, nIDC, value, pRecordset);
	}
	else
	{
		if (!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value))
		{
			SendMessage(hWndCtrl, LB_SETCURSEL, (WPARAM)-1, 0L);
		}
		else
		{
			// set current selection based on data string
			int i = (int)::SendMessage(hWndCtrl, LB_FINDSTRINGEXACT, (WPARAM)-1,
			  (LPARAM)(LPCTSTR)value);
			if (i < 0)
			{
				// no selection match
				TRACE0("Warning: no listbox item selected.\n");
			}
			else
			{
				// select it
				SendMessage(hWndCtrl, LB_SETCURSEL, i, 0L);
			}
		}
	}
}

void AFXAPI DDX_FieldLBIndex(CDataExchange* pDX, int nIDC, int& index,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	if (!pDX->m_bSaveAndValidate &&
		(!pRecordset->IsOpen() || pRecordset->IsFieldNull(&index)))
	{
		int nIndex = 0;
		DDX_LBIndex(pDX, nIDC, nIndex);
	}
	else
		DDX_LBIndex(pDX, nIDC, index);
}

void AFXAPI DDX_FieldCBString(CDataExchange* pDX, int nIDC, CString& value,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
	if (pDX->m_bSaveAndValidate)
	{
		// just get current edit item text (or drop list static)
		int nLen = ::GetWindowTextLength(hWndCtrl);
		if (nLen != -1)
		{
			CString strTemp;
			::GetWindowText(hWndCtrl, strTemp.GetBuffer(nLen), nLen+1);
			strTemp.ReleaseBuffer();
			nLen = strTemp.GetLength();
			if (nLen > value.GetAllocLength())
				AfxFailMaxChars(pDX, value.GetAllocLength());
			// get known length
			::GetWindowText(hWndCtrl, value.GetBuffer(0), nLen+1);
		}
		else
		{
			// for drop lists GetWindowTextLength does not work - assume
			//  preallocated length
			::GetWindowText(hWndCtrl, value.GetBuffer(0), value.GetAllocLength()+1);
		}
		value.ReleaseBuffer();
		if (value.GetLength() == 0)
		{
			if (pRecordset->IsFieldNullable(&value))
				pRecordset->SetFieldNull(&value, TRUE);
		}
		else
		{
			pRecordset->SetFieldNull(&value, FALSE);
		}
	}
	else
	{
		if (!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value))
		{
			SendMessage(hWndCtrl, CB_SETCURSEL, (WPARAM)-1, 0L);
		}
		else
		{
			// set current selection based on model string
			if (::SendMessage(hWndCtrl, CB_SELECTSTRING, (WPARAM)-1,
				(LPARAM)(LPCTSTR)value) == CB_ERR)
			{
				// just set the edit text (will be ignored if DROPDOWNLIST)
				AfxSetWindowText(hWndCtrl, value);
			}
		}
	}
}

void AFXAPI DDX_FieldCBStringExact(CDataExchange* pDX, int nIDC, CString& value,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
	if (pDX->m_bSaveAndValidate)
	{
		DDX_FieldCBString(pDX, nIDC, value, pRecordset);
	}
	else
	{
		if (!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value))
		{
			SendMessage(hWndCtrl, CB_SETCURSEL, (WPARAM)-1, 0L);
		}
		else
		{
			// set current selection based on data string
			int i = (int)::SendMessage(hWndCtrl, CB_FINDSTRINGEXACT, (WPARAM)-1,
			  (LPARAM)(LPCTSTR)value);
			if (i < 0)
			{
				// no selection match
				TRACE0("Warning: no combobox item selected.\n");
			}
			else
			{
				// select it
				SendMessage(hWndCtrl, CB_SETCURSEL, i, 0L);
			}
		}
	}
}

void AFXAPI DDX_FieldCBIndex(CDataExchange* pDX, int nIDC, int& index,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	if (!pDX->m_bSaveAndValidate &&
		(!pRecordset->IsOpen() || pRecordset->IsFieldNull(&index)))
	{
		int nIndex = 0;
		DDX_CBIndex(pDX, nIDC, nIndex);
	}
	else
		DDX_CBIndex(pDX, nIDC, index);
}

void AFXAPI DDX_FieldScroll(CDataExchange* pDX, int nIDC, int& value,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	if (!pDX->m_bSaveAndValidate &&
		(!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value)))
	{
		int nValue = 0;
		DDX_Scroll(pDX, nIDC, nValue);
	}
	else
		DDX_Scroll(pDX, nIDC, value);
}

/////////////////////////////////////////////////////////////////////////////
// Data exchange for special controls

void AFXAPI DDX_FieldCheck(CDataExchange* pDX, int nIDC, int& value, CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
	if (pDX->m_bSaveAndValidate)
	{
		value = (int)::SendMessage(hWndCtrl, BM_GETCHECK, 0, 0L);
		ASSERT(value >= 0 && value <= 2);
		if (value == 2)
		{
			if (pRecordset->IsFieldNullable(&value))
				pRecordset->SetFieldNull(&value);
			else
			{
				TRACE0("Warning: checkbox value indeterminate and field can't be NULL.\n");
				// Default to unchecked
				value = 0;
			}
		}
	}
	else
	{
		if (!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value))
		{
			int style = ((int)::GetWindowLong(hWndCtrl, GWL_STYLE) & 0xf);
			if ((style == BS_3STATE || style == BS_AUTO3STATE))
				value = 2;
			else
			{
				TRACE0("Warning: field NULL and checkbox can't be indeterminate.\n");
				// Default to unchecked
				value = 0;
			}
		}
		if (value < 0 || value > 2)
		{
			value = 0;      // default to off
			TRACE1("Warning: dialog data checkbox value (%d) out of range.\n",
				value);
		}
		::SendMessage(hWndCtrl, BM_SETCHECK, (WPARAM)value, 0L);
	}
}

void AFXAPI DDX_FieldRadio(CDataExchange* pDX, int nIDC, int& value,
	CRecordset* pRecordset)
{
	ASSERT_VALID(pRecordset);

	if (!pDX->m_bSaveAndValidate &&
		(!pRecordset->IsOpen() || pRecordset->IsFieldNull(&value)))
		value = -1;
	DDX_Radio(pDX, nIDC, value);
	if (pDX->m_bSaveAndValidate)
	{
		if (value == -1 && !pRecordset->IsFieldNullable(&value))
		{
			AfxFailRadio(pDX);
		}
		else
		{
			pRecordset->SetFieldNull(&value, (value == -1));
		}
	}
}

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

#ifdef _DEBUG
void CRecordView::AssertValid() const
{
	CFormView::AssertValid();
}

void CRecordView::Dump(CDumpContext& dc) const
{
	CFormView::Dump(dc);

	dc << "m_bOnFirstRecord = " << m_bOnFirstRecord;
	dc << "\nm_bOnLastRecord = " << m_bOnLastRecord;

	dc << "\n";
}
#endif

//////////////////////////////////////////////////////////////////////////////
// Inline function declarations expanded out-of-line

#ifndef _AFX_ENABLE_INLINES

static char _szAfxDbInl[] = "afxdb.inl";
#undef THIS_FILE
#define THIS_FILE _szAfxDbInl
#define _AFXDBVIEW_INLINE
#include "afxdb.inl"

#endif

#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif

IMPLEMENT_DYNAMIC(CRecordView, CFormView)

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