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HookAPI source code

, 31 Jan 2005
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A system wide api source code for windows api hook developpers


HookAPI is the API SDK that sets up system wide hooks for all windows platforms. It could easily hook 32-bit windows system APIs or 32-bit user-defined DLL. It could be used easily and all you need to do is write a DLL file named mydll.dll or mydll_9x.dll. It is based on ApiSpy32 by Yariv Kaplan.

The code injects two DLLs into the destination application. The first DLL, HookAPIxx.dll, updates the API's first 5 bytes:

papi[0] =0xE8;
*(DWORD *)&papi[1] =(DWORD)ProcessCall -(DWORD)papi -CALL_BYTES_SIZE;

The nother DLL mydllxxx.dll, runs the new API instead of the old API, like this sample to hook the socket function:
int WINAPI mysocket(int af, int type, int protocol)
   WriteLog("debug mysocket, af=%d, type=%d, protocol=%d", af, type, protocol);

   return socket(af, type, protocol);

And HookAPIxx.dll hooks the CreateProcessW/CreateProcessA functions, so it can catch the creation of new processes and inject the two DLLs:

#ifdef WINNT
   if(!strcmp(pinfo->api_name, "CreateProcessW") || 
      !strcmp(pinfo->api_name, "CreateProcessA") )
      pi =(PROCESS_INFORMATION *)pdwParam[9];
          InjectLib(pi->hProcess, fname);  // hook new process<CODE>
</CODE>      }

If you want to use it, then load the first DLL HookAPIxx.dll. If it's an NT system(WinNT/XP/200x), you should call function HookAllProcess() in the DLL and call UnhookAllProcess when you exit. There are other functions in the DLL, like HookOneProcess, HookOneProcess2 to hook one application on NT system.

mydllxx.dll is loaded by HookAPIxx.dll when HookAPIxx.dll is initialized, and then makes the hook:

It includes the following parts:
  • HookAPI SDK full source codes
  • many examples source codes, such as;

  1. Hook socket functions like socket, send, recv, connect, ...

  2. Hook file functions like CreateFile, ReadFile, ...

  3. Hook registry functions like RegOpenKey, RegQueryValue, RegQueryValueEx, ...

  4. Delphi sample for Hook socket function

  5. Delphi sample for Hook file function

  6. Hook ExitWindowsEx

  7. Hook LoadLibrary and GetProcAddress

  8. Hook GDI functions like TextOut, ExtTextOut

  9. Hook Shell API function like SHBrowseForFolder, SHGetFileInfo, ...

  10. Hiden Processes sample, it can hide processes, task managers cannot find it

  11. Filter Advertisement bar sample, it can filter AD bar of IE or other network application, or filter the data from some ports of TCP/UDP

  12. Message Filter sample, it can filter some messages of the windows

  13. Execute file manager sample, it can forbide some files open, execute, and hidden some folders or files

  14. Net encrypt sample, it can encrypt all the application that wrriten with socket. With this, you will not need encrypt in your application.

  15. hook a ship game to auto drop bomb and auto elude bullet


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author
Web Developer
China China
An old C programmer in China.

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Comments and Discussions

QuestionRe: to download new version Pin
zantoy5-Oct-07 0:45
memberzantoy5-Oct-07 0:45 
QuestionHookAPINT crashing IE , MSDEV, Adob photoshop etc...????? Pin
Rakesh R. Yadava8-Dec-06 4:35
memberRakesh R. Yadava8-Dec-06 4:35 
GeneralHyper Threading Environment Pin
sneijder7-Dec-06 19:58
membersneijder7-Dec-06 19:58 
GeneralTextOut hook API Pin
biman ghpsh5-Dec-06 21:13
memberbiman ghpsh5-Dec-06 21:13 
Generalabout the bug Pin
programsalon30-Nov-06 18:25
memberprogramsalon30-Nov-06 18:25 
GeneralRe: about the bug Pin
wangk19831-Dec-06 0:16
memberwangk19831-Dec-06 0:16 
QuestionHow to fix the bug??? Pin
wangk198328-Nov-06 22:18
memberwangk198328-Nov-06 22:18 
QuestionFor whom wants to hook FILE OPERATION Pin
wangk198325-Nov-06 9:11
memberwangk198325-Nov-06 9:11 
I've noticed that quite many people wants to use hook to controrl the file operation,I'm also one of themSmile | :)
Following is mt summary:
From the codes given,now what we can do contains:
1.Stop the filename changing,file copy/move from the EXPLORER way,file contents modifying using hookshell
2.Stop file operation on one chosen disk when using CMD or SaveAs way using HOOKFILE,but this way requires filtering quite many files and apps that we do not want to hook

So,what are your opinions guys?Give me some suggestions please guys!Thanks!
QuestionRe: For whom wants to hook FILE OPERATION Pin
zantoy5-Oct-07 2:08
memberzantoy5-Oct-07 2:08 
GeneralHookOneProcess and HOOKREG don't work properly Pin
tezm11-Aug-06 1:18
membertezm11-Aug-06 1:18 
GeneralRe: HookOneProcess and HOOKREG don't work properly Pin
programsalon30-Nov-06 18:30
memberprogramsalon30-Nov-06 18:30 
GeneralHelp on hooking 1 process only Pin
jefft26-Apr-06 5:11
memberjefft26-Apr-06 5:11 
GeneralRe: Help on hooking 1 process only Pin
programsalon27-Jun-06 18:54
memberprogramsalon27-Jun-06 18:54 
GeneralZeesh Pin
sdssd7-Apr-06 12:28
membersdssd7-Apr-06 12:28 
GeneralRe: Zeesh Pin
programsalon27-Jun-06 18:57
memberprogramsalon27-Jun-06 18:57 
GeneralFull source Code Pin
galaad_g_breizh21-Feb-06 5:27
membergalaad_g_breizh21-Feb-06 5:27 
GeneralRe: Full source Code Pin
Achernar27-Feb-06 21:37
memberAchernar27-Feb-06 21:37 
GeneralRe: Full source Code Pin
programsalon27-Jun-06 18:47
memberprogramsalon27-Jun-06 18:47 
GeneralRe: Full source Code Pin
programsalon27-Jun-06 19:30
memberprogramsalon27-Jun-06 19:30 
Generalusing CHookApi class Pin
vtalau6-Feb-06 18:30
membervtalau6-Feb-06 18:30 
GeneralWSARecv() is missing hook Pin
Pine19797-Dec-05 0:22
memberPine19797-Dec-05 0:22 
GeneralRe: WSARecv() is missing hook Pin
vtalau7-Feb-06 19:01
membervtalau7-Feb-06 19:01 
GeneralRe: WSARecv() is missing hook Pin
programsalon27-Jun-06 19:07
memberprogramsalon27-Jun-06 19:07 
GeneralNew proccess that start after my Hook APP run is not Hooked. Pin
tamtt31-Oct-05 5:10
membertamtt31-Oct-05 5:10 
GeneralRe: New proccess that start after my Hook APP run is not Hooked. Pin
programsalon27-Jun-06 19:17
memberprogramsalon27-Jun-06 19:17 

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