char string 轉換成 wchar_t string

方法一：

#include <cstdlib>
int mbstowcs(wchar_t *out, const char *in, size_t size);

 
方法二：

#include <windows.h>
int MultiByteToWideChar(
    [in]            UINT      CodePage,
    [in]            DWORD     dwFlags,
    [in]            LPCSTR    lpMultiByteStr,
    [in]            int       cbMultiByte,
    [out, optional] LPWSTR    lpWideCharStr,
    [in]            int       cchWideChar
);

 
範例：

catch (const std::exception& ex)
{
	int len = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, ex.what(), -1, nullptr, 0);
	wchar_t* wszDest = new wchar_t[len];
	MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, ex.what(), -1, wszDest, len);
	MessageBoxW(m_hwnd, wszDest, L"Error", MB_OK | MB_ICONERROR);
	delete [] wszDest;
	exit(EXIT_FAILURE);
}

source: How do I convert a char string to a wchar_t string?

 
#ansi #unicode #convert