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win32/HResult: try to use FormatMessage()

This commit is contained in:
Max Kellermann 2021-03-08 22:53:59 +01:00
parent 3a948515ce
commit 24a205a1aa
1 changed files with 12 additions and 1 deletions
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13
src/win32/HResult.cxx
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@ -18,6 +18,7 @@
*/
#include "HResult.hxx"
#include "system/Error.hxx"
#include <cassert>
#include <cstdarg>
@ -27,11 +28,21 @@
std::string
HResultCategory::message(int Errcode) const
{
char buffer[256];
/* FormatMessage() supports some HRESULT values (depending on
the Windows version) */
if (FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, Errcode, 0,
buffer, sizeof(buffer),
nullptr))
return buffer;
const auto msg = HRESULTToString(Errcode);
if (!msg.empty())
return std::string(msg);
char buffer[11]; // "0x12345678\0"
int size = snprintf(buffer, sizeof(buffer), "0x%1x", Errcode);
assert(2 <= size && size <= 10);
return std::string(buffer, size);