C / C++ / MFC

Re: get the desktop(monitor) width and height using win32

13-Jul-06 0:08

GetSystemMetrics retrieves width and height (in pixels) use this function with SM_CXSCREEN and

SM_CXSCREEN<code><br />
and see <code>ScreenToClient

maybe it is some helpful to you

whitesky

kk_mfc13-Jul-06 0:31

kk_mfc

13-Jul-06 0:31

Thanks to all.
Smile | :)

kk_mfc

Catching Exceptions thrown by a process

Pavan Rao12-Jul-06 22:54

Pavan Rao

12-Jul-06 22:54

I am working in C++ and I need to run an executable , "Process#1", within the context of another executable, "Process#2". Process#1 is bound to throw exceptions and Process#2 must be able to handle the exceptions thrown by process#1. I am unable to handle using createprocess() or ShellExecute(). Please let me know if there is a way to accomplish this.

Cheers
Pavan

Jonathan [Darka]12-Jul-06 23:04

Jonathan [Darka]

12-Jul-06 23:04

There is no easy way of doing this apart from Process#1 catching the exception and telling Process#2 what happened using some form of interprocess communication, you cannot throw exceptions across process boundaries which is a good thing.

Darka [Xanya]

Stephen Hewitt13-Jul-06 1:20

Stephen Hewitt

13-Jul-06 1:20

This is an unusual scenario and, without knowing exactly what you’re up to, I feel safe saying it is probably a bad design decision. That said it is possible. When you use the CreateProcess API you can pass the DEBUG_PROCESS or DEBUG_ONLY_THIS_PROCESS flags (the second is probably what you’re after) in the ‘dwCreationFlags’ parameter. This flag is used by debuggers, as you probably guessed by the name, and results in exceptions thrown in the child process being reported to the parent. The information is passed to the parent process via the WaitForDebugEvent API. There is more to it that that obviously and, as I said, I don’t recommend using this technique. If you don't know exactly what you're doing you'll make a mess. Also throwing an exception becomes much more expensive for the child as it now results in a context switch to the parent and back to the child again. The child my also behave slight differently in some aspects; for example the ghost window[^] feature will not work in the process being debugged (the child). That said there are protection schemes, such as Armadillo, which use this technique and the software which uses it seems to work ok and when a developer is making an app it works in the debugger. Also note that as a process can only have one debugger attached to it you will probably not be able to use your debugger on it and even debuggers which can work under these conditions (such as WinDBG) will not be as powerful under this environment.

Steve

Pavan Rao13-Jul-06 18:57

Pavan Rao

13-Jul-06 18:57

Steve, thank you for all that information. I wish to putforth a little more information that I need.
The child process handles most of the known exceptions, however, the parent process should handle the rest of the exceptions thats not handled by the child process itself. Exception handling by the parent process is a major part of the app that I need to develop.

Pavan Rao13-Jul-06 21:27

Pavan Rao

13-Jul-06 21:27

When the child process ( sample.exe ) throws an exception, I am unable to get the Exception info thrown by the child process in the parent process's DEBUG_EVENT structure.

<br />
#include<stdio.h><br />
#include<windows.h><br />
<br />
STARTUPINFO startupInfo;<br />
PROCESS_INFORMATION processInformation;<br />
DWORD code;<br />
DEBUG_EVENT debug_event;<br />
BOOL val = 1;<br />
int main()<br />
{<br />
/** sample.exe is the child process */<br />
 BOOL  b = CreateProcess(NULL,"Sample.exe", NULL,NULL,FALSE,DEBUG_ONLY_THIS_PROCESS ,NULL,<br />
                                    NULL,&startupInfo,&processInformation);<br />
		val = WaitForDebugEvent(&debug_event, 2000);<br />
return 1;<br />
}<br />

Cheers
Pavan Smile | :)

FindFile in website

includeh1012-Jul-06 22:37

includeh10

12-Jul-06 22:37

Ftp connection provides feature of FindFile in a website.

is it possible to use http to find files in a website?

because Ftp requires user name and password, I don't have them, i.e, to google or MS site.

eusto13-Jul-06 0:50

eusto

13-Jul-06 0:50

No.
The only thing you can do is something in the lines of wget. Download each page, parse it and get the next link.
This doesn't give you complete folder listings and may throw you to another http server also.
(usually, when someone asks if something can be done...i take a long time before saying no. In this case there's no doubt)

Hamid_RT13-Jul-06 1:16

13-Jul-06 1:16

you say he reads links in each page,right?

whitesky

eusto13-Jul-06 3:15

eusto

13-Jul-06 3:15

well yeah..if that's what he needs. If you have a better ideea, post it. Anyway, there's no way of listing files on a http server unless the server. If you're lucky, the server might print the contents of a folder into a html page but that still leaves you with a html page full of links.

Hamid_RT13-Jul-06 3:24

i want to use menu in dialog box.

13-Jul-06 3:24

of course i had like this problem and i used like this way
I think you have a better idea

whitesky

Amit Agarrwal12-Jul-06 22:17

Amit Agarrwal

12-Jul-06 22:17

i want to use menu in dialog box..how can i use it.
thanx

*Dreamz12-Jul-06 22:28

*Dreamz

12-Jul-06 22:28

1. Create a Menu Eg:IDR_MENU1
2. Open Dialog properties
3. Select IDR_MENU1 in Menu property.

Amit Agarrwal12-Jul-06 23:10

Amit Agarrwal

12-Jul-06 23:10

hello
thanx..its working

can i handle menu similarly as i handle for the Doc/View Archicture.
thanx.

*Dreamz12-Jul-06 23:29

*Dreamz

12-Jul-06 23:29

Yes

_AnsHUMAN_ 12-Jul-06 22:32

_AnsHUMAN_

12-Jul-06 22:32

Go to Resources> Add A menu (SAY IDR_MYMENU)
Go to dialog editor. Right click for the property window.
In the property window select the menu you want to show

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Amit Agarrwal12-Jul-06 23:08

Amit Agarrwal

12-Jul-06 23:08

hello
thanx..its working

can i handle menu similarly as i handle for the Doc/View Archicture.
thanx.

_AnsHUMAN_ 12-Jul-06 23:28

_AnsHUMAN_

12-Jul-06 23:28

Yeah In the OnCommand function of your dialog do this

switch(wParam)
{
case ID_FILE_HELLO:
              AfxMessageBox("i am here");
              break;
// etc follow with more options
}

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

wlwlxj12-Jul-06 23:18

wlwlxj

12-Jul-06 23:18

VC6 Dialog->Properties->General->Menu
set Meun ID in the Combox

ddddddddddddddddddddd

Hamid_RT13-Jul-06 0:08