9925.txt

关于编程技术技巧的文章

} 
if (nCol ＜ nFirstCol) // 移到GRID的左边时换上一行 
{ 
nCol = nCols - 1; 
nRow--; 
} 
if (nRow ＜ nFirstRow) 
// 移到GRID的上端时换下端 
nRow = nRows - 1; 
if (nRow ＞= nRows) 
// 移到GRID的下端时换上端 
nRow = nFirstRow; 
//设置移动后GRID的当前单元 
pParent-＞m_bEventLockout = (nCol != nOldCol); //only allow one change event 
pGrid-＞SetNumProperty("Row", nRow); 
pParent-＞m_bEventLockout = FALSE; 
pGrid-＞SetNumProperty("Col",nCol); // generate Row/Col change event 
return TRUE; 
} 

改造后的Grid 类CGridEntry : 
CGridEntry 类是CFormView的派生类,数据成员m_pGrid指向GRID控制,实现可直
接在GRID单元上输入的"电子表格"。m_edit是CMyEdit 类对象。成员函数
SizeToFit()用于调整编辑窗口大小,使其与网格单元一致。成员函数PositionEdit()
用于调整编辑窗口位置,接收新的输入焦点。函数FindCellPosition 实现根据网
格的行列号,返回单元的左上角坐标。 
今后使用CGridEntry 类,仅仅需在App studio 中定制 
class CGridEntry : public CFormView 
{ 
DECLARE_DYNCREATE(CGridEntry) 
protected: 
CGridEntry(); 
public: 
enum { IDD = IDD_GRIDENTRY }; 
//对话框资源ID值 
CVBControl* m_pGrid; 
CMyEdit 
m_edit; 
public: 
BOOL 
m_bInitialized; 
protected: 
void SizeToFit(); 
void PositionEdit(); 
CPoint FindCellPosition(int nRow, int nCol); 
virtual void DoDataExchange(CDataExchange* pDX); 
virtual void OnInitialUpdate(); 
// first time after construct 
afx_msg void OnRowColChangeGrid(UINT, int, CWnd*, LPVOID); 
afx_msg void OnChangeGridEdit(); 
afx_msg void OnClickGrid(UINT, int, CWnd*, LPVOID); 
DECLARE_MESSAGE_MAP() 
}; 
IMPLEMENT_DYNCREATE(CGridEntry, CFormView) 
BEGIN_MESSAGE_MAP(CGridEntry, CFormView) 
ON_VBXEVENT(VBN_ROWCOLCHANGE, IDC_GRID, OnRowColChangeGrid) 
ON_EN_CHANGE(IDC_GRIDEDIT, OnChangeGridEdit) 
ON_VBXEVENT(VBN_CLICK, IDC_GRID, OnClickGrid) 
END_MESSAGE_MAP() 
CGridEntry::CGridEntry(): CFormView(CGridEntry::IDD) 
{ 
m_pGrid = NULL; 
m_bInitialized = FALSE; 
} 
void CGridEntry::OnInitialUpdate() 
// first time after construct 
{ 
// 动态划分一个控件的子集,并使m_edit从属于CGridEntry对象 
m_edit.SubclassDlgItem(IDC_GRIDEDIT, this); 
CFormView::OnInitialUpdate(); 
//设置GRID控制窗口的风格包含 WS_CLIPSIBLINGS风格 
HWND hWndGrid = m_pGrid-＞GetSafeHwnd(); 
DWORD dwStyles = ::GetWindowLong(hWndGrid, GWL_STYLE); 
::SetWindowLong(hWndGrid, GWL_STYLE, dwStyles | WS_CLIPSIBLINGS); 
if (!m_bInitialized) 
{ 
m_bEventLockout = TRUE; 
int nRows = (int)m_pGrid-＞GetNumProperty("Rows"); 
int nCols = (int)m_pGrid-＞GetNumProperty("Cols"); 
char buf[80]; 
m_pGrid-＞SetNumProperty("Col", 0); //设置GRID的行号 
for (int nRow = 1; nRow ＜ nRows; nRow++) 
{ 
wsprintf(buf, "%d", nRow); 
m_pGrid-＞SetNumProperty("Row", nRow); 
m_pGrid-＞SetStrProperty("Text", buf); 
} 
m_pGrid-＞SetNumProperty("Row", 0); //设置GRID的列号 
for (int nCol = 1; nCol ＜ nCols; nCol++) 
{ 
wsprintf(buf, "%c", 'A' + nCol - 1); 
m_pGrid-＞SetNumProperty("Col", nCol); 
m_pGrid-＞SetStrProperty("Text", buf); 
} 
for (nRow = 1; nRow ＜ nRows; nRow++) 
{ 
//在此添加初始GRID单元的代码 
} 
m_pGrid-＞SetNumProperty("Row", 1); 
m_pGrid-＞SetNumProperty("Col", 1); 
// force edit to reposition 
m_bEventLockout = FALSE; 
} 
SizeToFit(); 
PositionEdit(); 
} 
void CGridEntry::DoDataExchange(CDataExchange* pDX) 
{ 
CFormView::DoDataExchange(pDX); 
DDX_VBControl(pDX, IDC_GRID, m_pGrid); 
} 
void CGridEntry::OnRowColChangeGrid(UINT, int, CWnd*, LPVOID) 
{ 
PositionEdit(); 
} 
#define TWIPS_PER_INCH 1440 
void CGridEntry::SizeToFit() 
{ 
m_pGrid-＞SetNumProperty("LeftCol", m_pGrid-＞GetNumProperty("FixedCols")); 
m_pGrid-＞SetNumProperty("TopRow", m_pGrid-＞GetNumProperty("FixedRows")); 
//ptSize 为GRID的逻辑尺寸 
CPoint ptSize = FindCellPosition((int)m_pGrid-＞GetNumProperty("Rows"),(int)
m_pGrid-＞GetNumProperty("Cols")); 
if (ptSize.x != (int)m_pGrid-＞GetNumProperty("Width") || 
ptSize.y != (int)m_pGrid-＞GetNumProperty("Height")) 
{//GRID的大小与逻辑尺寸不一致时,调用Move 方法重新设置GRID的大小及尺寸 
CRect rect; 
rect.left = (int)m_pGrid-＞GetNumProperty("Left"); 
rect.top 
= (int)m_pGrid-＞GetNumProperty("Top"); 
rect.right = rect.left + ptSize.x; 
rect.bottom = rect.top + ptSize.y; 
m_pGrid-＞Move(rect); 
ptSize.x += 2 * rect.left; 
ptSize.y += 2 * rect.top; 
//设置滚动条 
SetScrollSizes(MM_TEXT, (CSize)ptSize); 
} 
} 
// 返回单元左上角的相对逻辑坐标, 
// 当 nRow == maxRow and nCol == maxCol 时,返回值即为GRID的大小 
CPoint CGridEntry::FindCellPosition(int nRow, int nCol) 
{ 
ASSERT(nRow＞= 0 && nRow ＜= m_pGrid-＞GetNumProperty("Rows")); 
ASSERT(nCol ＞= 0 && nCol ＜= m_pGrid-＞GetNumProperty("Cols")); 
CPoint ptPos(0, 0); 
// Get left edge of requested cell by summing widths of previous cells 
int nLeftCol = (int)m_pGrid-＞GetNumProperty("LeftCol"); 
int nLeftFix = (int)m_pGrid-＞GetNumProperty("FixedCols"); 
for (int i = 0; i ＜ nCol; i++) 
{ 
//累加列宽度 
if (i ＜ nLeftFix || i ＞= nLeftCol) // only count displayed cells 
ptPos.x += (int)m_pGrid-＞GetNumProperty("ColWidth", i); 
} 
// Get top edge of requested cell by summing Heights of previous cells 
int nTopRow = (int)m_pGrid-＞GetNumProperty("TopRow"); 
int nTopFix = (int)m_pGrid-＞GetNumProperty("FixedRows"); 
for (i = 0; i ＜ nRow; i++ i++) 
{ //累加行高度 
if (i ＜ nTopFix || i ＞= nTopRow) 
// only count displayed cells 
ptPos.y += (int)m_pGrid-＞GetNumProperty("RowHeight", i); 
} 
// ptPos 为逻辑twips单位,需转变为点象素单位 
CClientDC dc(this); 
ptPos.x = MulDiv(ptPos.x, dc.GetDeviceCaps(LOGPIXELSX), TWIPS_PER_INCH); 
ptPos.y = MulDiv(ptPos.y, dc.GetDeviceCaps(LOGPIXELSY), TWIPS_PER_INCH); 
ptPos.x += nCol; 
// add one pixel per column for gap 
ptPos.y += nRow; 
// add one pixel per row 
for gap 
return ptPos; 
} 
void CGridEntry::PositionEdit() 
{ 
//移动编辑窗口到适当位置,并从GRID单元取出文本添充当前编辑窗口 
int nRow = (int)m_pGrid-＞GetNumProperty("Row"); 
int nCol = (int)m_pGrid-＞GetNumProperty("Col"); 
CPoint ptPos = FindCellPosition(nRow, nCol); 
// ptPos为相对坐标需加上GRID的左上角坐标 
ptPos.x += (int)m_pGrid-＞GetNumProperty("Left"); 
ptPos.y += (int)m_pGrid-＞GetNumProperty("Top"); 
CClientDC dc(this); 
int nWidth= MulDiv((int)m_pGrid-＞GetNumProperty("ColWidth", nCol), 
(int)dc.GetDeviceCaps(LOGPIXELSX), TWIPS_PER_INCH) + 2; 
int nHeight= MulDiv((int)m_pGrid-＞GetNumProperty("RowHeight", nRow), 
(int)dc.GetDeviceCaps(LOGPIXELSY), TWIPS_PER_INCH) + 2; 
//移动编辑窗口位置及调整其大小,并添充当前编辑窗口 
m_edit.MoveWindow(ptPos.x, ptPos.y, nWidth, nHeight, TRUE); 
CString s = m_pGrid-＞GetStrProperty("Text"); 
m_edit.SetWindowText(s); 
// Set to reflect cell's data 
m_edit.ShowWindow(SW_SHOW); 
m_edit.SetSel(0, -1); 
m_edit.Invalidate(); 
} 
void CGridEntry::OnChangeGridEdit() 
{ 
CString str; 
BOOL bValid; 
int nValue = GetDlgItemInt(IDC_GRIDEDIT, &bValid, TRUE); 
if (!bValid) 
return; 
// must be a valid int in order to copy. 
m_edit.GetWindowText(str); 
m_pGrid-＞SetStrProperty("Text", str); 
int nRow = (int)m_pGrid-＞GetNumProperty("Row"); 
int nCol = (int)m_pGrid-＞GetNumProperty("Col"); 
} 
void CGridEntry::OnClickGrid(UINT, int, CWnd*, LPVOID) 
{ 
SizeToFit(); 
PositionEdit(); 
} 
       
****************************************************************
　
             VC++程序中用对话框的形式显示HTML文件

                        zhou daibing

----在安装了IE4后，可以在程序中用对话框的形式显示HTML文件，如弹出用
HTML写的帮助文件等等，如同直接用浏览器，但又与浏览器风格不同。

----其实现如下： 
//在头文件或.cpp文件的开头
包含文件urlmon.h，定义函数
/////
#include "urlmon.h"
typedef HRESULT STDAPICALLTYPE SHOWHTMLDIALOGFN
(HWND hwndParent, IMoniker
*pmk, VARIANT *pvarArgIn, TCHAR* pchOptions,
VARIANT *pvArgOut);
//////

//函数显示对话框，成功返回TRUE,失败返回FALSE
BOOL ShowHtml()
{
HINSTANCE hinstMSHTML = LoadLibrary
(TEXT("MSHTML.DLL")); //装载动态连接库
WCHAR url[]=L"HTTP://www.ccw.com.cn";
//此地址名称可直接用html文件名代替

if(hinstMSHTML)//装载动态连接库成功
{
SHOWHTMLDIALOGFN *pfnShowHTMLDialog;

pfnShowHTMLDialog = (SHOWHTMLDIALOGFN*)
GetProcAddress(hinstMSHTML,
TEXT ("ShowHTMLDialog"));

if(pfnShowHTMLDialog)
{
IMoniker *moniker=NULL;

//
if( FAILED(CreateURLMoniker(NULL,
(LPWSTR)url,&moniker ) ))
{
FreeLibrary(hinstMSHTML);
return FALSE;
}

//调用ShowHTMLDialog函数显示URL上的HTML文件
pfnShowHTMLDialog(m_hWnd,moniker,NULL,NULL,NULL);

if(moniker!=NULL)
moniker->Release();

//显示成功，返回TRUE
return TRUE;