MFC学习之 将 list 表里的信息写入.txt文本 和 .xls EXCEL 文件中

1、将 listcontrol 表中的信息 用 Cfile 函数写入 .txt 中 ，用ODBC来实现excel的写操作。

afx_msg void OnBnClickedButtonExport();
int32_t ExportToTXT(CString& strFilePath);
int32_t ExportToXLS(CString& strFilePath);

void CLogPageDlg::OnBnClickedButtonExport()
{
//弹出保存文件对话框，输入保存的日志文件名，并选择保存类型 txt | xls
SYSTEMTIME st;
GetLocalTime(&st);

CString str;
str.Format(_T("%4d%02d%02d%02d%02d%02d.txt"), st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);

CFileDialog dlg(FALSE, _T("txt"), str, OFN_EXPLORER | OFN_PATHMUSTEXIST, _T("Text Files (*.txt)|*.txt|WorkSheet Files (*.xls)|*.xls||"));
if (IDOK != dlg.DoModal())
{
return;
}

//开始导出
CString strPathName = dlg.GetPathName();
CString strExt = dlg.GetFileExt();
strExt.MakeLower();

int32_t ret = 0;

if (_T("txt") == strExt)//保存txt
{
ret = ExportToTXT(strPathName);
}
else if (_T("xls") == strExt)//保存xls
{
ret = ExportToXLS(strPathName);
}

return;
}

int32_t CLogPageDlg::ExportToTXT(CString& strFilePath)
{
USES_CONVERSION;

CFile mytxtFile;
CString strCaption, strMsg;

if(!mytxtFile.Open(strFilePath, CFile::modeCreate | CFile::modeReadWrite))
{
strCaption.LoadString(IDS_MESSAGEBOX_CAPTION);
strMsg.LoadString(IDS_OPENFILE_FAILED);

strMsg += strFilePath;

MessageBoxDLg(strMsg, strCaption, MB_OK | MB_ICONERROR, this);

return fail;
}

//计算列的宽度
int32_t width[5] = {0};
int32_t i = 0, j = 0, nLen = 0;
int32_t nCount = m_logList.GetItemCount();

//构造格式化字符串
char format[512] = {0};
char buf[1024] = {0};

CString str0, str1, str2, str3, str4;

str0.LoadString(IDS_COME);
width[0] = strlen(T2A(str0));

str1.LoadString(IDS_TIME);
width[1] = strlen(T2A(str1));

str2.LoadString(IDS_USERS);
width[2] = strlen(T2A(str2));

str3.LoadString(IDS_CONTENT);
width[3] = strlen(T2A(str3));

str4.LoadString(IDS_REMAKE);
width[4] = strlen(T2A(str4));

for (i = 0; i < 5; i++)
{
for (j = 0; j < nCount; j++)
{
nLen = strlen(T2A(m_logList.GetItemText(j, i)));
if (nLen > width[i]) width[i] = nLen;
}

//多点间隔
width[i] += 10;
}

//format
sprintf_s(format, "%%-%ds %%-%ds %%-%ds %%-%ds %%-%ds \r\n", width[0], width[1], width[2], width[3], width[4]);

//打印列名
sprintf_s(buf, format, T2A(str0), T2A(str1), T2A(str2), T2A(str3), T2A(str4));
mytxtFile.Write(buf, strlen(buf));

for (i = 0; i < nCount; i++)
{
str0 = m_logList.GetItemText(i, 0);
str1 = m_logList.GetItemText(i, 1);
str2 = m_logList.GetItemText(i, 2);
str3 = m_logList.GetItemText(i, 3);
str4 = m_logList.GetItemText(i, 4);

sprintf_s(buf, format, T2A(str0), T2A(str1), T2A(str2), T2A(str3), T2A(str4));
mytxtFile.Write(buf, strlen(buf));
}

mytxtFile.Close();

return success;
}

int32_t CLogPageDlg::ExportToXLS(CString& strFilePath)
{
CDatabase database;
CString sDriver = _T("MICROSOFT EXCEL DRIVER (*.XLS)"); // Excel安装驱动
CString sSql;
CString strCaption, strMsg;

try
{
//检测是否安装了excel驱动程序
if (!CheckExcelDriver())
{
strCaption.LoadString(IDS_MESSAGEBOX_CAPTION);
strMsg.LoadString(IDS_EXCEL_DRIVER_FAILED);

MessageBoxDLg(strMsg, strCaption, MB_OK | MB_ICONERROR, this);
return fail;
}

//创建excel连接字符串
sSql.Format(_T("DRIVER={%s};DSN='';FIRSTROWHASNAMES=1;READONLY=FALSE;CREATE_DB=\"%s\";DBQ=%s"),
sDriver, strFilePath, strFilePath);

//打开xls文件失败，成功则创建xls数据库文件
if(!database.OpenEx(sSql, CDatabase::noOdbcDialog))
{
strCaption.LoadString(IDS_MESSAGEBOX_CAPTION);
strMsg.LoadString(IDS_OPEN_EXCEL_FAILED);

MessageBoxDLg(strMsg, strCaption, MB_OK | MB_ICONERROR, this);
return fail;
}

//创建表
CString str0, str1, str2, str3, str4;

str0.LoadString(IDS_COME);
str1.LoadString(IDS_TIME);
str2.LoadString(IDS_USERS);
str3.LoadString(IDS_CONTENT);
str4.LoadString(IDS_REMAKE);

sSql.Format(_T("CREATE TABLE log (%s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT)"),
str0, str1, str2, str3, str4);
database.ExecuteSQL(sSql);

//循环导入数据
int32_t i = 0, j = 0;
CString str5, str6, str7, str8, str9;
int32_t nCount = m_logList.GetItemCount();
for (i = 0; i < nCount; i++)
{
str5 = m_logList.GetItemText(i, 0);
str6 = m_logList.GetItemText(i, 1);
str7 = m_logList.GetItemText(i, 2);
str8 = m_logList.GetItemText(i, 3);
str9 = m_logList.GetItemText(i, 4);

sSql.Format(_T("INSERT INTO log (%s, %s, %s, %s, %s) values('%s', '%s', '%s', '%s', '%s')"),
str0, str1, str2, str3, str4, str5, str6, str7, str8, str9);
database.ExecuteSQL(sSql);
}

//关闭xls数据库
database.Close();
}
catch(...)
{
//提示excel操作出现异常
strCaption.LoadString(IDS_MESSAGEBOX_CAPTION);
strMsg.LoadString(IDS_EXCEL_OPENFILE_FAILED);

MessageBoxDLg(strMsg, strCaption, MB_OK | MB_ICONERROR, this);
return fail;
}

return success;
}

BOOL CLogPageDlg::CheckExcelDriver()
{
TCHAR szBuf[2001] = {0};
WORD cbBufMax = 2000;
WORD cbBufOut = 0;
TCHAR *pszBuf = szBuf;

//获取已安装驱动的名称
if (!SQLGetInstalledDrivers(szBuf, cbBufMax, &cbBufOut))
{
return FALSE;
}

//查找excel
while (_tcslen(pszBuf) > 0)
{
if (NULL != _tcsstr(pszBuf, _T("Excel")))
{
return TRUE;
}

pszBuf += _tcslen(pszBuf) + 1;
}

return FALSE;
}