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fix: clear 1 warning - report the real error when a Windows G-code export fails (#15582)

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fix: report the real error when a Windows G-code export fails

copy_file built its failure message as "Error: " + errCode. Adding a DWORD
to a string literal is pointer arithmetic, not concatenation, so the pointer
lands errCode bytes into an 8-byte literal and runs past its end for any code
above 7. std::string then calls strlen on it and throws length_error, and the
catch(...) in BackgroundSlicingProcess::finalize_gcode replaces the diagnosis
with "Unknown error occurred during exporting G-code."

Every code a user is likely to hit is past the end: write-protected media is
19, no media 21, a full disk 112, and a destination held open by another
program 32. Codes 1 to 7 stay inside the literal and produce a truncated
message instead. So the "Maybe the SD card is write locked?" text has not
been reachable on Windows since this path was added in #2923.

Now that it is reachable, that guess only fits removable media, so it is
conditional on m_export_path_on_removable_media. The existing string is
untouched and keeps its 23 translations; the fixed-drive case adds one string.
This commit is contained in:
Kris Austin
2026-09-09 05:55:19 -05:00
committed by GitHub
parent 46180c3f54
commit fa3dbfcc6f
3 changed files with 40 additions and 2 deletions
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36
tests/libslic3r/test_utils.cpp
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@@ -2,6 +2,13 @@
#include "libslic3r/Utils.hpp"
#include "test_utils.hpp"
#include <algorithm>
#include <cctype>
#include <fstream>
#include <string>
#ifndef _WIN32
#include <unistd.h> // getuid
#endif
@@ -52,3 +59,32 @@ TEST_CASE("per-user temp root is unchanged on Windows, isolated elsewhere", "[ut
REQUIRE_THAT(root, Catch::Matchers::StartsWith(base + "/orcaslicer_"));
#endif
}
TEST_CASE("copy_file reports the OS error when the destination cannot be written", "[utils]") {
ScopedTemporaryFile source(".txt");
{
std::ofstream ofs(source.string(), std::ios::binary);
ofs << "orca";
}
REQUIRE(boost::filesystem::exists(source.path()));
// A directory that was never created, so the copy fails on every platform.
const boost::filesystem::path destination = source.path().parent_path() / "orca-missing-dir" / "copy.txt";
REQUIRE_FALSE(boost::filesystem::exists(destination.parent_path()));
std::string error_message;
REQUIRE(copy_file(source.string(), destination.string(), error_message) == FAIL_COPY_FILE);
REQUIRE_FALSE(error_message.empty());
#ifdef _WIN32
// The Windows branch formats GetLastError() itself. Writing that as
// "Error: " + errCode adds an integer to a string literal, which indexes into the
// literal instead of appending and runs off its end for any code above 7.
const std::string prefix = "Error: ";
REQUIRE(error_message.rfind(prefix, 0) == 0);
const std::string code = error_message.substr(prefix.size());
REQUIRE_FALSE(code.empty());
REQUIRE(std::all_of(code.begin(), code.end(), [](unsigned char c) { return std::isdigit(c) != 0; }));
#endif // _WIN32
}