class MyString
{
public:
MyString(const std::wstring& s2)
{
s = s2;
}
operator LPCWSTR() const
{
return s.c_str();
}
private:
std::wstring s;
};
int _tmain(int argc, _TCHAR* argv[])
{
MyString s = L"MyString";
CStringW cstring = L"CString";
wprintf(L"%s\n", (LPCWSTR)cstring); // Okay. Becase it has an operator LPCWSTR()
wprintf(L"%s\n", cstring); // Okay, fine. But how?
wprintf(L"%s\n", (LPCWSTR)s); // Okay. fine.
wprintf(L"%s\n", s); // Doesn't work. Why? It prints gabage string like "?."
return 0;
}
如何将CString传递给格式字符串%s?
顺便提一下,MSDN说(这很奇怪)
要在可变参数函数中使用CString对象
显式地将CString转换为LPCTSTR字符串,如下所示:
CString kindOfFruit = "bananas";
int howmany = 25;
printf( "You have %d %s\n", howmany, (LPCTSTR)kindOfFruit );