[转载] 转换CString到其它c-string类型

CString 字符串转换成char-array（又叫做c-string）有很多方法，在这里做一下归纳。

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ANSI项目

• CString 转换到 const char*

  CString cs("MfcTips.com");  
  const char* psz = cs.GetString();

• CString 转换到 char*

  CString cs("MfcTips.com");  
  char* psz = cs.GetBuffer(256);  
  // do something with psz here
  cs.ReleaseBuffer();

• CString 转换到 const wchar*

  CString csa("MfcTips.com");  
  CStringW csw(csa); // use an intermediate CStringW  
  const wchar* psz = csw.GetString();

• CString 转换到 wchar*

  CString csa("tinyant.com");  
  CStringW csw(csa ); // use an intermediate CStringW  
  wchar* psz = csw.GetBuffer(256);  
  // do something with psz here
  csw.ReleaseBuffer();

• CString 转换到 std::wstring

  CString cs("MfcTips.com");  
  std::wstring wstr;  
  wstr = CStringW(cs).GetString(); // use an intermediate CStringW

• CString 转换到 std::string

  CString cs("MfcTips.com");  
  std::string str;  
  str = ws.GetString();

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Unicode项目

• CString 转换到 const wchar*

  CString cs(L"MfcTips.com");  
  const wchar* psz = cs.GetString();

• CString 转换到wchar*

  CString cs(L"MfcTips.com")  
  wchar* psz = cs.GetBuffer(256);  
  // do something with psz here
  cs.ReleaseBuffer();

• CString 转换到 const char*

  CString csw(L"MfcTips.com");  
  CStringA csa(csw); // use an intermediate CStringA  
  const char* psz = csa.GetString();

• CString 转换到 char*

  CString csw(L"MfcTips.com");  
  CStringA csa(csw); // use an intermediate CStringA  
  char* psz = csa.GetBuffer(256);  
  // do something with psz here
  csa.ReleaseBuffer();

• CString 转换到 std::wstring

  CString cs(L"MfcTips.com");  
  std::wstring wstr;  
  wstr = cs.GetString();

• CString 转换到 std::string

  CString cs(L"MfcTips.com");  
  std::string str;  
  str = CStringA(cs).GetString(); // use an intermediate CStringA

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警告：

• Using (LPSTR)(LPCSTR), or (LPTSTR)(LPCTSTR), or (LPWSTR)(LPCWSTR) cast on a CString object to get non-const PSTR is unsafe. It is stupid idiotic nonsense.
• The double cast is handled from right to left so the (LPCSTR) or (LPCTSTR) or (LPCWSTR) is handled first. This will give you a const pointer to the CString object's internal buffer.
• The CString object's internal buffer is "locked" when you access it this way.
• The (LPSTR) or (LPTSTR) or (LPWSTR) cast is handled next. This simply removes the const-ness attribute from the pointer. It does not change anything about the CString object's internal buffer which is what the pointer points to. The CString object's internal buffer is still "locked" when you access it this way.
• So the resulting (non-const) PSTR points to data which is pseudo-const, which could be a very bad thing.
• It compiles, and executes, but if you attempt to modify the data in this PSTR your application may crash.
• If you want to get a non-const PSTR to a CString object's internal buffer, you should use CString::GetBuffer(Size).

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原文链接：Convert CString to any type of c-string