kou commented on code in PR #13203:
URL: https://github.com/apache/arrow/pull/13203#discussion_r884452357
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cpp/src/arrow/util/io_util.cc:
##########
@@ -203,16 +203,26 @@ std::string ErrnoMessage(int errnum) { return
std::strerror(errnum); }
#if _WIN32
std::string WinErrorMessage(int errnum) {
- char buf[1024];
- auto nchars = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, errnum, 0, buf, sizeof(buf), NULL);
- if (nchars == 0) {
+#define MAX_N_CHARACTERS 1024
+#define MAX_N_UTF8_BYTES 4096
+ WCHAR utf16_message[MAX_N_CHARACTERS];
+ auto n_utf16_chars =
+ FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
+ errnum, 0, utf16_message, sizeof(utf16_message), NULL);
+ if (n_utf16_chars == 0) {
// Fallback
std::stringstream ss;
ss << "Windows error #" << errnum;
return ss.str();
}
- return std::string(buf, nchars);
+ const UINT code_page = CP_UTF8;
+ const DWORD flags = 0;
+ char utf8_message[MAX_N_UTF8_BYTES];
+ auto n_utf8_bytes = WideCharToMultiByte(code_page, flags, utf16_message,
n_utf16_chars,
Review Comment:
I've changed to use `WideStringToUTF8()`.
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