Can anyone help me to correct this code:
char szBuff[64];
sprintf(szBuff, "%p", m_hWnd);
MessageBox(NULL, szBuff, L"Test print handler", MB_OK);
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The error is, it cant convert the 2nd parameter to LPCWSTR.
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);
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.
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).
You might want to look at mbstowcs, which will convert a conventional "one byte per character" string to a "multiple byte per character" string.
Alternatively, change your project settings to use Multibyte Strings - by default they are usually "Unicode" or "Wide Character" strings (I can't remember the exact option name off the top of my head).
If you are compiling with UNICODE
, make all the strings you work with double width - i.e. define them as wchar_t*
.
If you really must convert ASCII to Unicode, use ATL conversion macros.
Since your tag suggests VC++, I am suggesting CString. If yes, then the following snippet will also work for your case:
CString szBuff;
szBuff.Format(_T("%p"), m_hWnd);
MessageBox(NULL, szBuff, L"Test print handler", MB_OK);
Using MultiByteToWideChar() works for me:
void main(int argc, char* argv[])
{
...
wchar_t filename[4096] = {0};
MultiByteToWideChar(0, 0, argv[1], strlen(argv[1]), filename, strlen(argv[1]));
// RenderFile() requires LPCWSTR (or wchar_t*, respectively)
hr = pGraph->RenderFile(filename, NULL);
...
}
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