when use 7z, i found the error like this"Wrong update mode"

[flutelifh1980]

my code is c++, like this: std::wstring zipPath = FilePath::Combine(targetPath, targetZipName) + L".7z";
bit7z::Bit7zLibrary lib("7za.dll");
BitFileCompressor compressor{ lib, BitFormat::SevenZip };
compressor.setCompressionLevel(BitCompressionLevel::Fast);
compressor.compressDirectory(utils::toString(targetFolderPath), utils::toString(zipPath));

i run it, finally , the error is " failed to zip cache dir. error info: Cannot update the existing archive: Wrong update mode." . my bit7z version is 23.01.

[rikyoz]

Hi!
The error is due to the fact that the output archive file zipPath already exists on the filesystem.
By default, bit7z throws an error in such case.

If you want to update the existing archive, you need to set the correct UpdateMode:

compressor.setUpdateMode(UpdateMode::Append); // New items will be appended to the existing archive.
// or
compressor.setUpdateMode(UpdateMode::Update); // New items whose path already exists in the archive will overwrite the old ones, other will be appended.

If instead you want to entirely overwrite the existing archive file, you need to set OverwriteMode as follows:

compressor.setOverwriteMode(OverwriteMode::Overwrite);

In this case, the existing archive will be replaced with the new one.

I just realized that the error message "Wrong update mode" is not exactly clear on which is the issue. I'll probably improve it in a next version of the library.

[rikyoz]

As an aside, I've seen you use std::wstring for strings like zipPath.
If you are only targeting Windows, you might consider building bit7z with the -DBIT7Z_USE_NATIVE_STRING=ON option: in this case bit7z will use std::wstrings for all its string function arguments.
This allows you to avoid using utils::toString for std::wstring -> std::string conversions.

[flutelifh1980]

ok, thanks. i try to test this according to your method. thanks.