Crate wcxhead 

Contents of file wcxhead.h It contains definitions of error codes, flags and callbacks

Error Codes

Use the following values when you want to inform Totalcmd that an error ocurred.

Constant	Value	Description
	0	Success
E_END_ARCHIVE	10	No more files in archive
E_NO_MEMORY	11	Not enough memory
E_BAD_DATA	12	CRC error in the data of the currently unpacked file
E_BAD_ARCHIVE	13	The archive as a whole is bad, e.g. damaged headers
E_UNKNOWN_FORMAT	14	Archive format unknown
E_EOPEN	15	Cannot open existing file
E_ECREATE	16	Cannot create file
E_ECLOSE	17	Error closing file
E_EREAD	18	Error reading from file
E_EWRITE	19	Error writing to file
E_SMALL_BUF	20	Buffer too small
E_EABORTED	21	Function aborted by user
E_NO_FILES	22	No files found
E_TOO_MANY_FILES	23	Too many files to pack
E_NOT_SUPPORTED	24	Function not supported

Unicode Support

With Total Commander 7.5 (packer plugin interface 2.20), Unicode support has been added to all plugin types. In principle, you need to implement the same functions as for ANSI, with two differences: The function name is changed from FunctionName to FunctionNameW, and Ansi strings are changed to wide char names.

Total Commander will call the Unicode functions on all NT-based systems (Windows NT, 2000, XP) if they are present. If not, or on Windows 9x/ME, Total Commander will call the Ansi functions.

The following functions of the packer plugin interface support Unicode:

OpenArchiveW
ReadHeaderExW
ProcessFileW
SetChangeVolProcW
SetProcessDataProcW
PackFilesW
DeleteFilesW
StartMemPackW
CanYouHandleThisFileW

The following functions do not exist in a Unicode form and must be implemented as Ansi:

ReadHeader - use ReadHeaderEx
CloseArchive
GetPackerCaps
ConfigurePacker
PackToMem
DoneMemPack
PackSetDefaultParams
ReadHeaderEx

What’s the easiest way to support Unicode in an existing plugin?

1. Get my sample plugin fsplugin (file system plugins section) even if you write a different type of plugin!

2. Add the files cunicode.h and cunicode.cpp to your project. They contain various functions to make Unicode support easier.

3. Convert your existing functions to Unicode and rename them to FunctionNameW. For all file functions like CreateFile, do not call their Unicode counterpart CreateFileW directly. Instead, call the functions from cunicode.cpp like CreateFileT. These functions automatically call the right Unicode or Ansi function, and even support file name lengths >259 characters!

4. For each converted function like FunctionNameW, recreate a function FunctionName which you call this way:

int __stdcall FunctionName(char* SomeString1,char* SomeString2)
{
    WCHAR SomeString1W[wdirtypemax],SomeString2W[wdirtypemax];
    return FunctionNameW(awfilenamecopy(SomeString1W,SomeString1),awfilenamecopy(SomeString2W,SomeString2));
}

The Macro awfilenamecopy will convert the Ansi string SomeString1 to Unicode and store it inSomeString1W. This variable must not be a pointer, because awfilenamecopy uses “countof” to get the target length.

64-bit support

With Total Commander 8, Total Commander is now also available in 64-bit. Since plugins are simple dlls, and 64-bit programs can only load 64-bit dlls, a plugin needs to be re-compiled with a 64-bit compiler to work with 64-bit Total Commander.

IMPORTANT: A 64-bit plugin must have the same name as the 32-bit plugin and be in the same directory, but ‘64’ must be appended to the extension. Example: filesystem.wcx -> filesystem.wcx64. 64-bit-only plugins must also end with ‘64’.

Since all 64-bit Windows versions support Unicode, it’s sufficient to write a 64-bit Unicode-only plugin. However, if your existing 32-bit plugin only supports ANSI functions, you can port it without modifications to 64 bit. Total Commander 64-bit also supports the ANSI functions if it cannot find the Unicode functions. 64-bit Unicode plugins do not have an extension starting with ‘u’, they have the normal ‘wcx64’ extension.

Some porting notes:

All integer parameters in plugin functions remain 32-bit (e.g. in C: int, long, DWORD; Delphi: integer, dword), only pointers and handles are 64-bit wide now. Recompiling a program or dll with a 64-bit compiler usually takes care of this automatically without needing many changes. Problems can arise when converting pointers to integer or vice versa. Make sure to use 64-bit integer variables (e.g. size_t in C, ptrint or ptruint in Lazarus) for such operations.

What’s the easiest way to convert an existing plugin to 64-bit?

1. If the plugin was written in C or C++:

If you have Visual Studio Professional 2005 or later, a 64-bit compiler is already included. If you use the free Express version or Visual Studio 2003, you need to install the Windows Software Development Kit (SDK) in addition to Visual Studio Express.

Here is how to add 64-bit support to an existing plugin:

1. Check the toolbars in Visual Studio: There are comboboxes for the compile type (Debug or Release), and one which shows “Win32”.

2. Open the one showing “Win32”, and click on the “Configuration manager”.

3. Click on “New” in the Active Solution Platform list (right side). A new dialog box “New Solution Platform” will be shown.

4. In the upper field, choose “x64”

5. In the lower field, “copy from”, choose “Win32”

6. Make sure the checkbox “Create new project platform” is on

7. Click OK
   See also: http://msdn.microsoft.com/en-us/library/9yb4317s.aspx

8. Now you can switch in the same project between Win32 and x64. Switch to x64.

9. Open the settings of your project.

10. You should set the following options:
    C++ - Code generation - runtime library: Multi-threaded-Debug (/Mtd) <- not multithreaded debug dll !
    Linker - General - output file: wcx/pluginname.wcx64

Download links:

1. Visual Studio Express C++ edition:
   http://www.microsoft.com/visualstudio/en-us/products/2010-editions/visual-cpp-express
2. Windows Software Development Kit (SDK):
   http://msdn.microsoft.com/en-us/windows/bb980924.aspx

2. If the plugin was written in Delphi or Free Pascal:

There is a 64-bit Lazarus/Free Pascal available, which can be used to create 64-bit dlls. Total Commander itself was compiled with Lazarus as a 64-bit application. There are menu items in the “Tools” menu to convert Delphi projects and forms to Lazarus.

Lazarus/Free Pascal works a bit differently from Delphi, so some functions may need to be changed. Here are the problems encountered when porting Total Commander:

1. Free pascal is different -> Use {$MODE Delphi} in all *.pas files to handle functions the Delphi way
2. strnew creates a NIL pointer when the passed pchar is 0 bytes long. -> Use your own strnew function.
3. Windows messages below WM_USER are not passed to the windows procedure. -> Use SetWindowLongPtr to subclass the window
4. The calculation p-buffer is not working when p is a pwidechar, buffer an array of widechar -> use p-pwidechar(@bufffer)
5. INVALID_HANDLE_VALUE is incorrectly set to 0 instead of -1 in lcltype.pp! -> Put “windows” at end of “uses” command.

Download links:

You should download and install the 64-bit daily snapshot from
http://www.lazarus.freepascal.org/
Click on “Daily snapshots”, then on e.g. Lazarus + fpc 2.4.4 win64
The final releases are very outdated, so the snapshots usually work much better.

Examples

A plugin using this crate can be found here.

Special thanks

To all who support further development on Patreon, in particular:

• ThePhD

Structs

PackDefaultParamStruct

PackDefaultParamStruct is passed to PackSetDefaultParams to inform the plugin about the current plugin interface version and ini file location.

tHeaderData

tHeaderData is a structure used in ReadHeader.

tHeaderDataEx

tHeaderDataEx is a structure used in ReadHeaderEx.

tHeaderDataExW

tOpenArchiveData

tOpenArchiveData is used in OpenArchive.

tOpenArchiveDataW

Constants

BACKGROUND_MEMPACK

BACKGROUND_PACK

BACKGROUND_UNPACK

E_BAD_ARCHIVE

The archive as a whole is bad, e.g. damaged headers

E_BAD_DATA

CRC error in the data of the currently unpacked file

E_EABORTED

Function aborted by user

E_ECLOSE

Error closing file

E_ECREATE

Cannot create file

E_END_ARCHIVE

No more files in archive

E_EOPEN

Cannot open existing file

E_EREAD

Error reading from file

E_EWRITE

Error writing to file

E_NOT_SUPPORTED

Function not supported

E_NO_FILES

No files found

E_NO_MEMORY

Not enough memory

E_SMALL_BUF

Buffer too small

E_TOO_MANY_FILES

Too many files to pack

E_UNKNOWN_FORMAT

Archive format unknown

MEMPACK_DONE

Function call finished OK, there is no more data

MEMPACK_OK

Function call finished OK, but there is more data

MEM_OPTIONS_WANTHEADERS

Return archive headers with packed data

PK_CAPS_BY_CONTENT

Detect archive type by content

PK_CAPS_DELETE

Can delete files

PK_CAPS_ENCRYPT

Plugin supports PK_PACK_ENCRYPT option

PK_CAPS_HIDE

Show as normal files (hide packer icon), open with Ctrl+PgDn, not Enter

PK_CAPS_MEMPACK

Supports packing in memory

PK_CAPS_MODIFY

Can modify exisiting archives

PK_CAPS_MULTIPLE

Archive can contain multiple files

PK_CAPS_NEW

Can create new archives

PK_CAPS_OPTIONS

Has options dialog

PK_CAPS_SEARCHTEXT

Allow searching for text in archives created with this plugin

PK_CRYPTOPT_MASTERPASS_SET

The user already has a master password defined

PK_CRYPT_COPY_PASSWORD

Copy encrypted password to new archive name

PK_CRYPT_DELETE_PASSWORD

Delete password

PK_CRYPT_LOAD_PASSWORD

PK_CRYPT_LOAD_PASSWORD_NO_UI

Load password only if master password has already been entered!

PK_CRYPT_MOVE_PASSWORD

Move password when renaming an archive

PK_CRYPT_SAVE_PASSWORD

PK_EXTRACT

Extract to disk

PK_OM_EXTRACT

PK_OM_LIST

PK_PACK_ENCRYPT

Ask user for password, then encrypt

PK_PACK_MOVE_FILES

Delete original after packing

PK_PACK_SAVE_PATHS

Save path names of files

PK_SKIP

Skip this file

PK_TEST

Test file integrity

PK_VOL_ASK

Ask user for location of next volume

PK_VOL_NOTIFY

Notify app that next volume will be unpacked

Type Aliases

tChangeVolProc

tChangeValueProc is a typedef of the function that asks the user to change volume.

tChangeVolProcW

tPkCryptProc

PkCryptProc is a callback function, which the plugin can call to store passwords in the secure password store, read them back, or copy them to a new connection.

tPkCryptProcW

tProcessDataProc

tProcessDataProc is a typedef of the function that notifies the user about the progress when un/packing files.

tProcessDataProcW