Problems with paths longer than 259 characters

[fabri9532]

I have this path on my hard disk (without quotes): "C:\Cartella Condivisa\DITTE STUDIO BELLON SRL\CONTABILITA' ORDINARIE\GENTOREMONA SRL IN LIQUIDAZIONE (CESSATA 01.04.2019)\BILANCIO FINALE DI LIQUIDAZIONE\BILANCIO FINALE DI LIQUIDAZIONE\"

In the final folder I have the following files (without quotes): "Delega Gentono Fabio in favore della moglie Torramini Silvana Claudia.as" "Delega Gentono Fabio in favore della moglie Torramini Silvana Claudia.pdf" "Delega Gentono Fabio in favore della moglie Torramini Silvana Claudia.pdf.p7m"

I use this code: bit7z::Bit7zLibrary lib{ L"7z.dll" };

    bit7z::BitCompressor compressor{ lib, bit7z::BitFormat::SevenZip };

    compressor.setCompressionMethod(bit7z::BitCompressionMethod::Lzma2);
    compressor.setCompressionLevel(bit7z::BitCompressionLevel::FAST);

    compressor.compressDirectory(L"C:\\Cartella condivisa", L"D:\\Output.7z");

Only the first file "Delega Gentono Fabio in favore della moglie Torramini Silvana Claudia.as" is present in the "Output.7z" and no error occurs.

I use 7zip Dll v19.00, Bit7z v3.1.1 and Windows 10 x64 v1909 I have tested with "Windows 10 long path name" enabled and disabled: same result.

I have 7zip installed (v19.00) and if I compress "Cartella Condivisa", all the files are compressed (also if "Windows 10 long path name" is disabled).

[rikyoz]

I use 7zip Dll v19.00, Bit7z v3.1.1 and Windows 10 x64 v1909 I have tested with "Windows 10 long path name" enabled and disabled: same result.

This is really weird. Have you tried to prepend \\?\ to the path passed to BitCompressor::compressDirectory, e.g., L"\\?\C:\\Cartella condivisa"?

[fabri9532]

If I prepend "\\?\" it works properly. If this behavior is normal, I think, if I don't prepend "\\? \" and there is a paths longer than 259 characters, bit7z should throw an exception or alternatively add note in the documentation to check the length externally to bit7z.

Thanks, Fabrizio.

[rikyoz]

Added the option BIT7Z_AUTO_PREFIX_LONG_PATHS for automatically prepend \\?\ to paths in v4.0.0.