7zip dll c++ example

[vlad]

Hello,

I'm a developer trying to make a small archive program using 7zip dll, but I can't figure out how to use it. I don't know where the CLSID and IID are defined, what IID to use in order to be able to compress multimple files into an archive.
My code looks something like this:

typedef int (_CreateObject)(const GUID clsid, const GUID iid, void *outObject);
HMODULE hMod = LoadLibrary("7zra.dll");
_CreateObject pfnCreate = (_CreateObject)GetProcAddress(hMod, "CreateObject");
GUID CLSID_CFormat7z = {0x23170F69, 0x40C1, 0x2790, {0x10, 0x00, 0x00, 0x01, 0x10, 0x07, 0x00, 0x00}};
GUID IID_Coder = {0x23170F69, 0x40C1, 0x278A, {0x00, 0x00, 0x00, 0x04, 0x00, 0x05, 0x00, 0x00}};

ICompressCoder2 pCoder = NULL;
int i = pfnCreate(&CLSID_CFormat7z, &IID_Coder, (void*)&pCoder);

I always get a NULL pointer. Can anyone help me with a simple example please?

[Igor Pavlov]

Try CPP\7zip\UI\Client7z example.

[vlad]

Thank you very much Igor.

[ali]

Dear Igor

I am trying to use your powerful library in vs 2015, i have built it using nmake, and now testing 7zClient sample, as I prompted in CMD
"Client7z.exe l test.7z"
the execution failed with error ("can't create archive file")

or by CMD "Client7z.exe a test.7z test1.txt"
the execution failed with error ("Can not open file as archive")

would you tell me what happened? or how to use 7Zip in vs 2015 c++?

Yours Sincerely

[Igor Pavlov]

probably some problem with CMD.
try another commands:

7z.exe
Client7z.exe
7z.exe l test.7z
Client7z.exe l test.7z

[ali]

or Update Error

[ali]

CMD has no error
if 7z.exe downloaded from sourceforge is used, compresed-file content are listed properly with no error!

I want to build from source files then use them in vs2015.

[Igor Pavlov]

Show the log:

Client7z.exe > log1.txt
Client7z.exe l test.7z > log2.txt

[ali]

finally i could use clinet7.exe to list zip file contents, the example works fine for zip files with extension .7z. but for .rar extension files, the line
archive->Open(file, &scanSize, openCallback) != S_OK
retruns true and then
PrintError("Can not open file as archive", archiveName);

how i fix this to open *.rar files?
and how i bulid your libraray as c++ static lib?

[ali]

i found how to solve last problem,

[John Tadiparthi]

Hi Ali,

We are looking for the C++ DLL or static lib version of Cleint7z which we can reference and use it for compressing. Did you manage to build it? If YES, can you please guide/share bit more details of how you managed it?

Regards
John

[IgorSmet]

Hi all!
Please tell me how you can use the ready library 7z.dll? How is this, for example, done in third-party applications like: PeaZip or WindowsRar ... ? The fact is that I cannot run the project Cleint7z in debug mode under my Visual Studio MFC project .....

[Igor Pavlov]

I cannot run the project Cleint7z in debug mode under my Visual Studio MFC project .....

If you can't run it, try to find the reason.
Simplify situation:
- use release mode instead of debug mode.
- compile Cleint7z without MFC.
- write here what version of Visual Studio.

[Igor Pavlov]

just open
CPP\7zip\UI\Client7z\Client7z.dsp
project and compile/run it.

[IgorSmet]

Hi all!
With the help of Client7z.cpp it was possible to successfully unpack all archives of the format 7z.
However, formats other than 7z are not decompressed.
Can you please tell me whether it is possible to unpack other archive formats using the components included in the source https://7-zip.org/sdk.html ?

[Igor Pavlov]

lzma sdk supports only 7z format.
You need full 7-zip source code instead for all format types.
Then you must use full 7z.dll from 7-zip, and just change clsid in Client7z.cpp.

enum
{
  kId_Zip = 1,
  kId_BZip2 = 2,
  kId_7z = 7,
  kId_Xz = 0xC,
  kId_Tar = 0xEE,
  kId_GZip = 0xEF
};

// use another id, if you want to support other formats (zip, Xz, ...).
// DEFINE_GUID_ARC (CLSID_Format, kId_Zip)
// DEFINE_GUID_ARC (CLSID_Format, kId_BZip2)
// DEFINE_GUID_ARC (CLSID_Format, kId_Xz)
// DEFINE_GUID_ARC (CLSID_Format, kId_Tar)
// DEFINE_GUID_ARC (CLSID_Format, kId_GZip)
DEFINE_GUID_ARC (CLSID_Format, kId_7z)

[IgorSmet]

Thank you. Tried...
All zip files were successfully unpacked.
But, .rar format is not all. Those that were created in WinRar with a higher compression ratio were not unpacked.
Archives .rar created in WindowsRar were successfully unpacked.
Can you please tell me what can be done about it?

[Igor Pavlov]

Try to unpack same "bad" rar with 7-Zip program.

[IgorSmet]

This bad" rar with 7-Zip program unpacks successfully

[IgorSmet]

Archives .rar in my program I tried to unpack with the value DEFINE_GUID_ARC (CLSID_Format, kId_Zip).
In the list of 6 values, I did not see a format similar to Rar.
Maybe you need to set another value CLSID_Format that matches the rar format?

[Igor Pavlov]

Handler GUIDs:

{23170F69-40C1-278A-1000-000110xx0000}

  01 Zip
  02 BZip2
  03 Rar
  04 Arj
  05 Z
  06 Lzh
  07 7z
  08 Cab
  09 Nsis
  0A lzma
  0B lzma86
  0C xz
  0D ppmd

  C0 AVB
  C1 LP
  C2 Sparse
  C3 APFS
  C4 Vhdx
  C5 Base64
  C6 COFF
  C7 Ext
  C8 VMDK
  C9 VDI
  CA Qcow
  CB GPT
  CC Rar5
  CD IHex
  CE Hxs
  CF TE
  D0 UEFIc
  D1 UEFIs
  D2 SquashFS
  D3 CramFS
  D4 APM
  D5 Mslz
  D6 Flv
  D7 Swf
  D8 Swfc
  D9 Ntfs
  DA Fat
  DB Mbr
  DC Vhd
  DD Pe
  DE Elf
  DF Mach-O
  E0 Udf
  E1 Xar
  E2 Mub
  E3 Hfs
  E4 Dmg
  E5 Compound
  E6 Wim
  E7 Iso
  E8 
  E9 Chm
  EA Split
  EB Rpm
  EC Deb
  ED Cpio
  EE Tar
  EF GZip

[IgorSmet]

Thank you. Tried.
If the value is - CLSID_Format {23170F69-40C1-278A-1000-000110030000} it still doesn't open the archive.
Failed function HRESULT hrzlt = archive->Open(file, &scanSize, openCallback); hrzlt == 1

Other types of popular archives open successfully.
What else can you advise?

[IgorSmet]

Substituted the value Rar5(0xCC) and everything turned out. Thank you

[IgorSmet]

In Client7z.cpp If the library function IInaArchive::Extract is busy extracting a very large archive, is it possible
to get the number of bytes extracted at the same time ??
For the purpose of obtaining percentages.

[Igor Pavlov]

Z7_COM7F_IMF(CArchiveExtractCallback::SetTotal(UInt64 /* size */))
{
  return S_OK;
}

Z7_COM7F_IMF(CArchiveExtractCallback::SetCompleted(const UInt64 * /* completeValue */))
{
  return S_OK;
}