对于这个特定案例，修复非常简单:

For this specific case, the fix is quite simple:

wchar_t szBuff[64];
swprintf(szBuff, L"%p", m_hWnd);
MessageBox(NULL, szBuff, L"Test print handler", MB_OK);

也就是说，始终使用 Unicode 字符串.一般来说，在 Windows 上编程时，使用 wchar_t 和 UTF-16 可能是最简单的.当然，这取决于您必须与其他系统进行多少交互.

That is, use Unicode strings throughout. In general, when programming on Windows, using wchar_t and UTF-16 is probably the simplest. It depends on how much interaction with other systems you have to do, of course.

对于一般情况，如果您有一个 ASCII(或 char *)字符串，请使用 WideCharToMultiByte 用于一般情况，或者 mbstowcs 如@Matthew 指出的更简单的情况(mbstowcs 如果字符串在当前 C 语言环境中有效).

For the general case, if you've got an ASCII (or char *) string, use either WideCharToMultiByte for the general case, or mbstowcs as @Matthew points out for simpler cases (mbstowcs works if the string is in the current C locale).