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from where should these functions be called
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i think u can do it from dll attach of the extension dll
nave
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I have in my project a CHyperlinkStatic class and I don't known who wrote it. Did anybody known something about?
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Given that it has Static in its name, I bet whoever wrote it does not have a correct understanding of how GUI controls work on Windows...! :P
Peace!
-=- James
If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)
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Why do you say that?
Steve
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Stephen Hewitt wrote: Why do you say that?
Experience.
Peace!
-=- James
If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)
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Hi All
I want to implement wildcard characters in comboBoxs where the columns of databases is listed like EmpI* (which may be EmpID or anything after EmpI).
how will I able to accept * with column name and how will I search or sort according to given option like EmpI*.
Please give the proper steps to do this or the test application code.
Love
Mausam
mausam
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If you want to query a MySQL database using wildchars have a look on LIKE operator: String Comparison Functions[^] It might go for other databases. Good luck!
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Hi all,
How can my application or process know that the user is going to End Process ( or End Process Tree ) it, with task manager?
I am using Windows XP.
Thank you.
- NS -
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Put simply, you cant... Task Manager calls TerminateProcess[^] which stops the process dead and doesn't allow it execute anymore code.
End Process is designed to be a last resort for processes which have stopped responsing.
Gavin Taylor
w: http://www.gavspace.com
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Yes, I understood...
Thank you... 
- NS -
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Almost but not quite true. If you select the "End Task" button from the "Applications" tab then task manager attempts to close the application gracefully by sending the window a WM_CLOSE message and only resorts to terminating it if it doesn't die within a timeout. If the "End Process" button is selected from the "Process" tab the process is terminated on the spot (as you describe). Actually things are actually slightly more complicated then described above but this gives the general idea.
Steve
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Perhaps you can hook the TerminateProcess function in the kernel dll, then whenever it is called, check to see if the process to end is your process then return immediatly and don't call the hooked function.
Hooking can be a tricky thing to accomplish actually, I've had some experience with it using Microsoft's Detours library, it took sometime but proved to be useful at last, maybe you can try and see what turns out for yourself
--
Wessam Fathi
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That may be a cruel thing...
Actually I was seeking for a simple method if any...
Anyway thank you very much for your support...
- NS -
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Patching TerminateProcess in one process will not effect other processes.
Steve
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Did you check out the detours library, Detours intercepts Win32 functions by re-writing target function images.
I used it when developing a simple firewall, to re-route all calls to winsock functions (connect, listen, send, recv). It is a system wide hook where all calls to the patched functions from all processes are redirected to my detour function.
--
Wessam Fathi
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I've used Detours extensively. Yes it re-writes the target image but that doesn't mean its effects are global. The changes would only be global if the page that contains the patched code was in a shared section; Code is never in a shared section. A simple example can prove this. This program detours MessageBoxA but only for its first instance. Run two instances and note that in the second (which doesn't apply a detour of its own) the detours from the first has no effect. The fact that Detours works this way is a consequence of the way the paging system and virtual memory works. To make it work the way you describe you would have to apply the patch to every process (which perhaps you done in your firewall).
----
// NotGlobal.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include <Detours.h>
#pragma data_seg(".SHARED")
LONG s_InstancesMinusOne = -1;
#pragma data_seg()
#pragma comment(linker, "/SECTION:.SHARED,rws")
DETOUR_TRAMPOLINE(int WINAPI Tram_MessageBoxA(
HWND hWnd,
LPCSTR lpText,
LPCSTR lpCaption,
UINT uType),
MessageBoxA)
int WINAPI My_MessageBoxA(HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType)
{
return Tram_MessageBoxA(hWnd, "Patched", lpCaption, uType);
}
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
if ( InterlockedIncrement(&s_InstancesMinusOne)==0 )
{
// First instance.
DetourFunctionWithTrampoline((PBYTE)&Tram_MessageBoxA, (PBYTE)&My_MessageBoxA);
}
MessageBox(NULL, "Original", "Hello", MB_OK);
InterlockedDecrement(&s_InstancesMinusOne);
return 0;
}
Steve
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Well I've used Detours extensively myself, when developing my graduation project back at college - it was an antivirus and a firewall package.
I used detours in the antivirus part, to intercept all calls to CreateProcess function, when the user tries to run any program it was blocked until user Allows / Denies.
It did work, I can send you videos for the application running if you want
Here is the code I used, that's only a bit demonstrating the technique not the whole code, so it definetely won't compile:
1. Detours management code encapsulated in a dll:
-------------------------------------------------
BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hInst = (HINSTANCE)hModule;
//intercept the API functions of the host program
Intercept();
hook = NULL;
//request a unique message number form the sytem for inter processes messaging
WM_HOOKMESSAGE = RegisterWindowMessage("{398E8909-327E-4ce8-B523-012AA80808A0}");
return TRUE;
case DLL_PROCESS_DETACH:
//if we had a successful interception, de-intercept the detour function
if(CreateProcessW_T && CreateProcessA_T)
DeIntercept();
//if we had a successful windows hook, un install that hook
if(hWndServer != NULL)
ClearHook(hWndServer);
return TRUE;
}
return TRUE;
}
//hook install function
CREATEHOOK_API bool SetHook(HWND hWnd)
{
if(hWndServer != NULL)
return FALSE; // already hooked!
hook = SetWindowsHookEx(WH_GETMESSAGE, (HOOKPROC)MyProc, hInst, 0);
if(hook != NULL)
{ /* success */
hWndServer = hWnd;
return TRUE;
} /* success */
return FALSE; // failed to set hook
}
//hook un-install functions
CREATEHOOK_API bool ClearHook(HWND hWnd)
{
if(hWnd != hWndServer || hWnd == NULL)
return FALSE;
BOOL unhooked = UnhookWindowsHookEx(hook);
if(unhooked)
hWndServer = NULL;
return unhooked;
}
//this is a dummy hook proc, since the main use of the hook is to
//load our library to all processes in the system
static LRESULT CALLBACK MyProc(int nCode, WPARAM wParam, LPARAM lParam)
{
return CallNextHookEx(hook, nCode, wParam, lParam);
}
//API interception installation function
CREATEHOOK_API int Intercept()
{
//intercept the CreateProcessW function
CreateProcessW_T
=(BOOL(WINAPI *)(LPCWSTR, LPWSTR, LPSECURITY_ATTRIBUTES,
LPSECURITY_ATTRIBUTES, BOOL, DWORD, LPVOID, LPCWSTR, LPSTARTUPINFOW, LPPROCESS_INFORMATION))DetourFunction((PBYTE)CreateProcessW,
(PBYTE)CreateProcessW_D);
//intercept the CreateProcessA function
CreateProcessA_T
=(BOOL(WINAPI *)(LPCTSTR, LPTSTR, LPSECURITY_ATTRIBUTES,
LPSECURITY_ATTRIBUTES, BOOL, DWORD, LPVOID, LPCTSTR, LPSTARTUPINFO, LPPROCESS_INFORMATION))DetourFunction((PBYTE)CreateProcessA,
(PBYTE)CreateProcessA_D);
return 0;
}
//API interception un-install function
CREATEHOOK_API int DeIntercept()
{
//Remove the interception of CreateProcessW function
DetourRemove((PBYTE)CreateProcessW_T, (PBYTE)CreateProcessW_D);
//Remove the interception of CreateProcessA function
DetourRemove((PBYTE)CreateProcessA_T, (PBYTE)CreateProcessA_D);
CreateProcessW_T = NULL;
CreateProcessA_T = NULL;
return 0;
}
2. Windows application that used the dll to intercept all calls to CreateProcess:
----------------------------------------------------------------------------
//locating and loading the hooking dll
char strPath[MAX_PATH];
GetModuleFileName(NULL, strPath, MAX_PATH);
PathRemoveFileSpec(strPath);
strcat(strPath, "\\CreateHook.dll");
hModDLL = LoadLibrary(strPath);
if(hModDLL != NULL)
{
//obtain a pointer to the hooking finstallation function
PTRSETHOOK startHook = (PTRSETHOOK)GetProcAddress(hModDLL, "SetHook");
//if obtained a valid pointer run the function
if(startHook)
{
startHook(hWnd);
bStatus = true; //set interception state to enabled
}
else
{
MessageBox(NULL, "Failed to start hooking", "Fatal Error", MB_ICONSTOP);
exit(9);
}
}
else
{
MessageBox(NULL, "Failed to load hooking DLL", "Fatal Error", MB_ICONSTOP);
exit(9);
}
--
Wessam Fathi
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This will work to a point - But the fact that it works is consistent with my previous post. The reason is that you're detouring the function in every process by using the global hook mechanism via SetWindowsHookEx. SetWindowsHookEx, when used to set a global hook, loads the hook DLL into every UI process and the DLL's entry point code sets up the detour. There is an obvious limitation to this technique inherited from the global hook mechanism; It will only work for processes that have a message pump. It will probably not work for console application for example. Also noteworthy is the licensing agreement of the Detours library - You can't use it in commercial applications without explicit permission.
Steve
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Thanks for your reply, actually I didn't know that it won't work except for applications with a message bump, and that it probably won't for console applications. That's a valuable piece of information I didn't actually know
Regarding the library licensing, I only used it for the college project - not a commercial application - so I didn't need to buy it.
--
Wessam Fathi
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The text will be displayed in the center of rectangleArea. So, how is this rectangle initialized ?
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The problem is when you calculate the rectangleArea by DrawText and DT_CALCRECT the right member of the rectangleArea will be reduced to the width of the text.
Then you show it using the same rectangleArea, how will it come to centre? Think...
- NS -
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