MFC convert CString to int, int to CString

CString str;
int a;

//CString to int
a = _wtoi(str);

//int to CString
str.Format(TEXT("%d"),a);

replaces tab with spaces in Visual Studio 2012

在VS上的功能表列上選擇

TOOLS->Options->Text Editor->All Languages->Tabs

in the Tab scheme, select Insert spaces instead Keep tabs