C / C++ / MFC

Re: Could I get the main window's handle of a process by the process's handle?

4-Apr-02 1:32

It's easy if you have the process id, which is not the same as the process handle. Just enumerate all top-level windows with <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/windows_7wvn.asp">EnumWindows</a> and compare its process id's (obtained with

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/windows_5y90.asp">GetWindowThreadProcessId</a>

) with the one you have. As for how to obtain the process id from the process handle, the problem is hard to tackle.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

liyuan-rey4-Apr-02 15:48

liyuan-rey

4-Apr-02 15:48

Thanks for you help! Big Grin | :-D

I find the way to get the process ID corresponding a process handle.
In Win95/98/Me/2000, some tool help functions ( CreateToolhelp32Snapshot, Process32First and Process32Next ) can finish it.
In NT/2000, look up the register key - HKEY_LOCAL_MACHINE\\software\\microsoft\\windows nt\\currentversion\\perflib - for some information.

Re: Could I get the main window's handle of a process by the process's handle?

Joaquín M López Muñoz4-Apr-02 18:39

Re: Could I get the main window's handle of a process by the process's handle?

4-Apr-02 18:39

Congratulations! What about bundling everything into a nifty library and posting an article here at CP? Regards.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

liyuan-rey7-Apr-02 16:20

liyuan-rey

7-Apr-02 16:20

With my poor English... Dead | X|

Oh, no... forget it! Cry | :((

Here already have some code handle it:
http://www.codeproject.com/system/mytop.asp Poke tongue | ;-P

Module path

3-Apr-02 23:55

Hi,

in my app I have the following code :

HWND hWnd = FindWindow(NULL, "Any window...");
(...)
char strClassName[64];
GetClassName(hWnd, strClassName, sizeof(strClassName));

Now that I have the handle and the class name of the window, is it possible to get the path of the program that is attached with the handle, like GetModuleFileName(NULL, ...) for my own app ?

Thanks in advance

Re: Module path

Joaquín M López Muñoz4-Apr-02 2:13

GUID structure inside the managed world

4-Apr-02 2:13

It can be done, but involves some amount of work. First, obtain the process id for the window with GetWindowThreadProcessId. Then, use the information contained in MSDN sample MODLIST.EXE Shows How to Enumerate Processes and Modules (Q192986) to enumerate the modules of the given process and its corresponding paths (a process is made of multiple modules, like the main .EXE and the different DLLs loaded). Please note the code differs for 95...ME and NT...XP systems.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

SasaT3-Apr-02 23:44

SasaT

3-Apr-02 23:44

Hi there!
I have some big problems translating one relatively separated dll written in C++ to the managed world because I don't know how to work with the GUID structure. I can't just replace it with the System::Guid structure cause one of my functions which returns guid is used from both worlds, managed and unmanaged.
I'm also getting errors when trying to assign one GUID to another.
The code looks like this:

GUID& GetGuid()
{
GUID guidVar1, guidVar2;
CoCreateGuid(&guidVar1); //error
guidVar = guidVar2; //error
return guidVar; //error
}

Help me please!!! Confused | :confused:

simple Question?

Neha3-Apr-02 22:54

Neha

3-Apr-02 22:54

How do i keep my widow active all the time?

Re: simple Question?

Mazdak4-Apr-02 0:10

Mazdak

4-Apr-02 0:10

I don't know if its help you:
with CWnd::SetWindowPos() you can set your window always on top. Smile | :)

Mazy

"The path you tread is narrow and the drop is shear and very high,
The ravens all are watching from a vantage point near by,
Apprehension creeping like a choo-train uo your spine,
Will the tightrope reach the end;will the final cuplet rhyme?"Cymbaline-Pink Floyd

Install on client computer MsXML 4.0

Braulio Dez3-Apr-02 21:59

Braulio Dez

3-Apr-02 21:59

Hi,

I have one application that uses MSXML4.dll, what do I need to install on the client's computer in order to make my program run ?, Just copy msxml4.dll on the system folder, and run RegSvr32 ? What about versions and... services packs and.. ?

Thanks, greetings
Braulio

Re: Install on client computer MsXML 4.0

Michael A. Barnhart4-Apr-02 8:03

Michael A. Barnhart

4-Apr-02 8:03

Legally you must get the runtime distribution and install all of the files in it. You can download it seperatly from the sdk.

Good ideas are not adopted automatically.
They must be driven into practice with courageous patients. -Admiral Rickover. ...

Access Rights!

hph3-Apr-02 21:40

3-Apr-02 21:40

Does anybody know how to get the access rights (security descriptor) of a directory or a file on the local machine ?

Tomasz Sowinski4-Apr-02 6:14

4-Apr-02 6:14

Use GetSecurityInfo[Ex] and GetNamedSecurityInfo[Ex].

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

hph4-Apr-02 6:26

4-Apr-02 6:26

How do i get the handle for the first parameter in GetSecurityInfo()!!

Tomasz Sowinski4-Apr-02 6:29

4-Apr-02 6:29

This is the file handle returned by CreateFile.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

hph4-Apr-02 6:33

4-Apr-02 6:33

Have you ever used the function LogonUser() ??

Tomasz Sowinski4-Apr-02 6:37

4-Apr-02 6:37

Yes.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

hph4-Apr-02 6:44

4-Apr-02 6:44

I allways get the error message: ERROR_PRIVILEGE_NOT_HELD. I know what it means, but i don't know how to fix it! What must i do to get i work!

Tomasz Sowinski4-Apr-02 6:55

4-Apr-02 6:55

Check KB article Q180548

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

hph4-Apr-02 7:30

4-Apr-02 7:30

thank you!!

hph4-Apr-02 9:20

Function _beginthreadex not recognized?

4-Apr-02 9:20

i have taken a look at the documentation you mentioned. It works fine, no warnings or errors at all. But the description of that code says that it can be used in the same way like LogonUser().

But where do i see that i works in the same way ?

and

LogonUser() returns a handle to the logged on user, which can be used in CreateProcessAsUser(). Where can i find or get this handle in that sample code ??

NicholasCougar3-Apr-02 21:38

NicholasCougar

3-Apr-02 21:38

I can't fix the problem for two days.
Any help will be greatly appreciated!!!

I created a new project, chose Win32 Application and checked An empty project. Then Added new cpp file and filled in following codes. The debug result has puzzled me for a long time, for there is no hint at all!!!

Here we go...

#define _WIN32_WINNT 0x0500

#define WIN32_LEAN_AND_MEAN

#include <stdio.h>
#include <stdlib.h>
#include <process.h>
#include <windows.h>

#include <string.h>
#include "..\MtVerify.h"

extern "C"

unsigned WINAPI ThreadFunc(void * p);

HANDLE ghEvent;

#define WM_JOB_PRINT_AS_IS WM_APP + 0x0001
#define WM_JOB_PRINT_REVERSE WM_APP + 0x0002
#define WM_JOB_PRINT_LOWER WM_APP + 0x0003

int main(VOID)
{
HANDLE hThread;
unsigned tid;

ghEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

hThread = (HANDLE) _beginthreadex(NULL,
0,
ThreadFunc,
0,
0,
&tid);
MTVERIFY(hThread);

WaitForSingleObject(ghEvent, INFINITE);

char *szText = strdup("Thank you for buying this book .\n ");
PostThreadMessage(tid, WM_JOB_PRINT_AS_IS, NULL, (LPARAM)szText);

szText = strdup("Text is easier to read forward. \n");
PostThreadMessage(tid, WM_JOB_PRINT_REVERSE, NULL, (LPARAM)szText);

szText = strdup("\nLOWER CASE IS FOR WHISPERING. \n");
PostThreadMessage(tid, WM_JOB_PRINT_LOWER, NULL, (LPARAM)szText);

WaitForSingleObject(hThread, INFINITE);

CloseHandle(hThread);

return 0;
}

VOID CALLBACK TimerFunc(
HWND hwnd,
UINT Msg,
UINT idEvent,
DWORD dwTime)
{
UNREFERENCED_PARAMETER(hwnd);
UNREFERENCED_PARAMETER(&Msg);

PostThreadMessage(GetCurrentThreadId(), WM_QUIT, 0,0);

}

unsigned WINAPI ThreadFunc(LPVOID n)
{
UNREFERENCED_PARAMETER(n);

MSG msg;

PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE);

SetEvent(ghEvent);

SetTimer(NULL, NULL, 2000, (TIMERPROC) TimerFunc);

while(GetMessage(&msg, NULL, 0,0))
{
char *psz= (char *) msg.lParam;
switch(msg.message)
{
case WM_JOB_PRINT_AS_IS:
printf(" the job print as is called %s", psz);
free(psz);
break;
case WM_JOB_PRINT_REVERSE:
printf(" %s ", strrev(psz));
free(psz);
break;
case WM_JOB_PRINT_LOWER:
printf("%s", _strlwr(psz));
free(psz);
break;
default:
DispatchMessage(&msg);
}
}

return 0;

}

Debug result:

--------------------Configuration: www - Win32 Debug--------------------
Compiling...
worker.cpp
J:\MultiThreads\www\worker.cpp(33) : error C2065: '_beginthreadex' : undeclared identifier
Error executing cl.exe.

www.exe - 1 error(s), 0 warning(s)

Best regard.

Re: Function _beginthreadex not recognized?

Joaquín M López Muñoz3-Apr-02 21:58