关于调试：WIndows系统编程使用标准C库

WIndows System Programming use of standard C library

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我正在阅读Johnson M. Hart Windows系统编程。他有一个使用va_start标准c方法的方法。在下面的示例中，有人可以解释为什么将Handle hOut传递给va_start吗？

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BOOL PrintStrings (HANDLE hOut, ...)

/* Write the messages to the output handle. Frequently hOut
will be standard out or error, but this is not required.
Use WriteConsole (to handle Unicode) first, as the
output will normally be the console. If that fails, use WriteFile.

hOut: Handle for output file.
... : Variable argument list containing TCHAR strings.
The list must be terminated with NULL. */
{
DWORD msgLen, count;
LPCTSTR pMsg;
va_list pMsgList; /* Current message string. */
va_start (pMsgList, hOut); /* Start processing msgs. */
while ((pMsg = va_arg (pMsgList, LPCTSTR)) != NULL) {
msgLen = lstrlen (pMsg);
if (!WriteConsole (hOut, pMsg, msgLen, &count, NULL)
&& !WriteFile (hOut, pMsg, msgLen * sizeof (TCHAR), &count, NULL)) {
va_end (pMsgList);
return FALSE;
}
}
va_end (pMsgList);
return TRUE;
}