Csting 转 LPCSTR 造成的错误现象和解决方法

1. 现象：

Compiling... ExcelText.cpp D:/MyWork/ginfo/client/src/skexcel/ExcelText.cpp(240) : error C2440: 'return' : cannot convert from 'class WTL::CString' to 'const char *'         No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called D:/MyWork/ginfo/client/src/skexcel/ExcelText.cpp(243) : error C2440: 'return' : cannot convert from 'unsigned short [1]' to 'const char *'         Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast Error executing cl.exe.

 

2. 代码：

    2.1 错误代码：

          LPCSTR CExcelText::ReadCell(DWORD dwRow, DWORD dwColumn)          {             if (m_lpCurSheetInfo != NULL)            {               LPEXCELCELLINFO lpCellInfo = LookupCell(dwRow, dwColumn);               if (lpCellInfo != NULL)               {                  return lpCellInfo->strText;               }            }            return _T("");         }

 

3. 解决方法：

    将粗体部分改为：

    return (LPCSTR)(LPCTSTR)_T("");

    return (LPCSTR)(LPCTSTR)lpCellInfo->strText;