Question

我正在尝试编译我在网上找到的一些旧游戏SRC这里的代码

bool LoadFromINI(std::wstring const& strINIFileName = _T("./Local.ini"), char const* szDefaultLocale = "");
bool LoadFromINB(std::wstring const& strINBFileName, wchar_t const* szDefaultLocale = _T(""));


C:\...\...Code\Cel_Convert_Source\Cosmos\include\BM/LocalMgr.h(60): error C2440: 'default argument' : cannot convert from 'const char [1]' to 'const wchar_t *'
1>          Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>C:\...\...Code\Cel_Convert_Source\Cosmos\include\BM/LocalMgr.h(60): error C2548: 'LOCAL_MGR::CLocal::LoadFromINB' : missing default parameter for parameter 2
1>C:\...\...Code\Cel_Convert_Source\Cosmos\include\BM/LocalMgr.h(59): error C2440: 'default argument' : cannot convert from 'const char [12]' to 'const std::wstring &'
1>          Reason: cannot convert from 'const char [12]' to 'const std::wstring'
1>          No constructor could take the source type, or constructor overload resolution was ambiguous
1>C:\...\...Code\Cel_Convert_Source\Cosmos\include\BM/LocalMgr.h(103): fatal error C1903: unable to recover from previous error(s); stopping compilation

还有一个错误：代码：

      _tcscpy_s(m_kDBName,30, (wchar_t const*)in_strDBName);

输出：

＆＃39; errno_t strcpy_s（char *，rsize_t，const char *）＆＃39; ：无法转换参数3来自＆＃39; const wchar_t *＆＃39;到＃char; char *＆＃39; 1 GT;指向的类型是无关的;转换需要reinterpret_cast，C风格的转换或函数式转换

Answer 1

将_T("blah")更改为L"blah"。

_T是一个不执行任何操作或添加L的宏。

或者，使用_T和TCHAR的

Answer 2

仅当您的项目是使用定义的_T("str")预处理程序符号进行编译时，L"str"才会扩展为UNICODE。在你的情况下，它似乎不是，所以_T()什么都不做。将函数声明更改为

bool LoadFromINI(std::wstring const& strINIFileName = L"./Local.ini", wchar_t const* szDefaultLocale = "");
bool LoadFromINB(std::wstring const& strINBFileName, wchar_t const* szDefaultLocale = L"");

或者如果你真的，真的必须支持_T()和TCHAR的内容，请将其更改为

bool LoadFromINI(std::basic_string<TCHAR> const& strINIFileName = _T("./Local.ini"), TCHAR const* szDefaultLocale = "");
bool LoadFromINB(std::basic_string<TCHAR> const& strINBFileName, TCHAR const* szDefaultLocale = _T(""));

现在第一个参数将是std::string或std::wstring，具体取决于是否定义了UNICODE。

'default argument'：无法从'const char [1]'转换为'const wchar_t *'

2 个答案: