device context for a menu - C / C++ / MFC Discussion Boards

Peter Weyzen3-Jun-04 7:56

3-Jun-04 7:56

I've got a service.

On rare occasions, it crashes. When it does, it needs to restart.

Here's the details:
(1) it is configured in service-control to restart if failure.
(2) we don't want to rely on DrWatson or any external program to monitor it.
(3) we've tried using SetServiceStatus to signal error on shutdown.

How do we programmatically signal to the service control manager that this failed and it just needs to restart. We've had some problems where 'crash ui' get's invoked.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

Re: Service Restart

Anonymous3-Jun-04 18:43

Anonymous

3-Jun-04 18:43

Peter,

Since no body is providing any direct answers I will ask a few questions.

How do you now it crashes? Does it log errors or what?
Could you define “crash”? If your service terminates abnormally then how can you signal anything since your “shutdown” routine will not be executed.

I am not familiar with the term “crash ui” what is it?

Ultimately I suggest you find the problem and fix it rather than counting on restart.

Re: Service Restart

palbano3-Jun-04 18:48

palbano

3-Jun-04 18:48

Ok... well that reply is me! Don't know how i managed to get logged out and post a reply at the same time. Maybe i need a beer!

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Service Restart

Peter Weyzen4-Jun-04 0:16

Peter Weyzen

4-Jun-04 0:16

Ultimately I'd like to fix all crashes. But if something bad does happen the service needs to log what happened and restart.

A crash is a crash -- and sometimes it's an assertion. We can detect the crash and write out a minidump. But getting the service control manager to allow us to restart is the problem.

As for "crash ui" -- on a machine with no installed debugger, a message box comes up saying that you did something bad (read attemtped at 0x000000....)

MSDN support had no good answer, except they recommended to write a "service monitor" program to accomplish what the SCM won't do.

oh well.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

Small ComboBox

doctorpi3-Jun-04 6:58

doctorpi

3-Jun-04 6:58

Hi guys
Somebody has an example about to reduce the minimum size of a ComboBox
When I add a Combo box,there is a minimum size and I'd like to have one smaller (I talk about height) than this.
Do you know a derived class where I could see how to do this?
Best Regards
Doc

Re: Small ComboBox

Antony M Kancidrowski3-Jun-04 9:35

Antony M Kancidrowski

3-Jun-04 9:35

You can adjust the height within the resource editor. If you click on the down arrow portion it outlines the minimum size.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

Re: Small ComboBox

Johan Rosengren4-Jun-04 3:39

Johan Rosengren

4-Jun-04 3:39

You might want to try SetItemHeight for the combo.

device context for a menu

Anonymous3-Jun-04 6:29

Anonymous

3-Jun-04 6:29

i want to draw into a windows menu but i
can't find a way to get a device context
for it. more specificially, i want to
make a rectangular menu of icons. windows
doesn't seem to support rectangular menus,
so instead i am making a menu with 1 owner
drawn item. i draw the menu when i get the
WM_DRAWITEM message. i can select the
correct option because i can call
GetCursor() when processing WM_MENUSELECT.
what i can't do is update the highlighting
while the mouse moves. i can process
WM_EVENTIDLE messages, but when handling
this message i have no way of drawing into
the menu. WM_DRAWITEM provides a DC, so I
know one exists in the system. Is there
any way to copy this DC and use it later,
or get the DC? Are menus implemented as
windows? Because if so i could maybe
get the hWnd for the menu or something.

Thanks, Phil.

Re: device context for a menu

Trollslayer3-Jun-04 7:09

Trollslayer

3-Jun-04 7:09

That sounds like a toolbar to me.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

What operation does MS Media Player perform while playing a video file through http?

rickyxian3-Jun-04 6:02

rickyxian

3-Jun-04 6:02

I am studying the communication of MS Media Player while it plays a http file. I find a interesting thing.

I wrote a small program to accept requests from the media player. For most video files like mpeg, I found that it sends http get request to download a the video file. But, the I tried to use the media player to play a wmv or asf file, it did not send any request, it however tried to receive the information from the server instead of sending a request. As result, the server program of course can not provide any wmv/asf file for downloading by media player.

I don't understand why media plyer doest not send an http request while downloading wmv or asf files. What possible inside operation does it perform?

Could you give me some tips?

Re: What operation does MS Media Player perform while playing a video file through http?

Ricky Xian3-Jun-04 17:55

Ricky Xian

3-Jun-04 17:55

Does anybody know?
Why does the web client begin to receive information from the server before sending a request? In what case they will do that?

Getting the process ID of an externally running application

Antony M Kancidrowski3-Jun-04 5:36

Antony M Kancidrowski

3-Jun-04 5:36

I am currently using the Pdh to enumerate through processes running on the system in order to get the process id of a particular application.

Given that I know its name is there a simpler way to achieve this?

Thanks

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

Re: Getting the process ID of an externally running application

David Crow3-Jun-04 8:46

David Crow

3-Jun-04 8:46

Here are a couple of options:

http://www.codeproject.com/threads/getprocessid.asp

http://www.mvps.org/vb/hardcore/html/moreabouthandlesprocessids.htm

http://www.efimov.org/mef/modules.php?name=News&file=article&sid=4

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Getting the process ID of an externally running application

Antony M Kancidrowski3-Jun-04 9:21

Antony M Kancidrowski

3-Jun-04 9:21

Thankyou David

I particularly like the WMI flavour. Big Grin | :-D

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

Re: Getting the process ID of an externally running application

Blake Miller4-Jun-04 14:26

Blake Miller

4-Jun-04 14:26

Okay, so WMI seems pretty neat, until you figure out what it takes to get it installed if it is not already on a system. Just a word of warning before running off to depend upon it.

Re: Getting the process ID of an externally running application

Antony M Kancidrowski5-Jun-04 6:04

Antony M Kancidrowski

5-Jun-04 6:04

Thanks I will bear this in mind

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

using multiple-language resource

alexander chupeev3-Jun-04 5:28

alexander chupeev

3-Jun-04 5:28

I wrote a resource script with menu resources duplicated on several languages.
MSDN states that I can control loading appropriate version of resource using
SetThreadLocale() call, but this way doesn't work. Operating system always
loads English version of menus in spite of what thread locale I'm using. Can
you tell me what's wrong? I'm working with Windows XP SP1.

Re: using multiple-language resource

David Crow3-Jun-04 7:50

David Crow

3-Jun-04 7:50

chupeev@tmn.ru wrote:
...I can control loading appropriate version of resource using
SetThreadLocale() call, but this way doesn't work.

What value does it return?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: using multiple-language resource

alexander chupeev3-Jun-04 14:54

alexander chupeev

3-Jun-04 14:54

SetThreadLocale() return TRUE. I'm feed in it LCID equal to
MAKELCID(MAKELANGID(LANG_RUSSIAN, SUBLANG_DEFAULT), SORT_DEFAULT),
but it resources loaded in English. Dont know why?

Re: using multiple-language resource

alexander chupeev4-Jun-04 6:36

alexander chupeev

4-Jun-04 6:36

Here is an example which should load russian version of menu, but it will display window with english menu. Why?

------------- sh ./eg.sh ------------------
#!/bin/sh
cat > generic.c << EOF
#include <windows.h>
#include <tchar.h>
#include <windowsx.h>

#define NAMESTART 16

WNDPROC Listbox_WindowProc;

BOOL CALLBACK Enumres_EnumProc(HMODULE hModule, \
LPCTSTR lpszType, LPCTSTR lpszName, LANGID wIDLanguage, LPARAM lParam)
{
TCHAR szItemText[NAMESTART + MAX_PATH];
HWND* hwnd = (HWND*) lParam;
wsprintf(szItemText, TEXT("%#03x %#03x - "), PRIMARYLANGID(wIDLanguage), SUBLANGID(wIDLanguage));
if (0 < GetModuleFileName(hModule, &szItemText[lstrlen(szItemText)], MAX_PATH))
{
ListBox_AddString(*hwnd, szItemText);
}
return (GetLastError() == ERROR_SUCCESS? TRUE: FALSE);
}

void Enumres_OnDestroy(HWND hwnd)
{
SetWindowLong(hwnd, GWL_WNDPROC, (LONG) Listbox_WindowProc);
PostQuitMessage(0);
}

LRESULT CALLBACK Enumres_WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
HANDLE_WM_DESTROY(hwnd, wParam, lParam, Enumres_OnDestroy);
break;
default:
return Listbox_WindowProc(hwnd, uMsg, wParam, lParam);
}
return 0;
}

BOOL InitInstance(int nCmdShow)
{
LCID dwCurrLocale = MAKELCID(MAKELANGID(LANG_RUSSIAN, SUBLANG_DEFAULT), SORT_DEFAULT);
if (SetThreadLocale(dwCurrLocale))
{
HMENU menu = LoadMenu(NULL, TEXT("GENERIC"));
if (menu)
{
HWND hwnd = CreateWindow(
TEXT("LISTBOX"), // name of window class
TEXT("Enumres"), // title-bar string
WS_OVERLAPPEDWINDOW, // top-level window
CW_USEDEFAULT, // default horizontal position
CW_USEDEFAULT, // default vertical position
CW_USEDEFAULT, // default width
CW_USEDEFAULT, // default height
NULL, // no owner window
menu, // required menu
NULL, // handle to application instance
(LPVOID) NULL); // no window-creation data
if (hwnd)
{
Listbox_WindowProc = (WNDPROC) SetWindowLong(hwnd, GWL_WNDPROC, (LONG) Enumres_WindowProc);
if (EnumResourceLanguages(NULL, RT_MENU, TEXT("GENERIC"), Enumres_EnumProc, (LPARAM) &hwnd))
{
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
return TRUE;
}
}
}
}
return FALSE;
}

int WINAPI _tWinMain(HINSTANCE hCurrInst, HINSTANCE hPrevInst, LPTSTR lpCmdLine, int nCmdShow)
{
if (InitInstance(nCmdShow))
{
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return ((int) msg.wParam);
}
return 0;
DBG_UNREFERENCED_PARAMETER(hPrevInst);
DBG_UNREFERENCED_PARAMETER(lpCmdLine);
}
EOF
cat > resource.h << EOF
#define ID_FILE_NEW 100
#define ID_FILE_OPEN 101
#define ID_FILE_SAVE 102
#define ID_FILE_SAVE_AS 103
#define ID_FILE_PRINT 104
#define ID_FILE_PRINT_SETUP 105
#define ID_FILE_EXIT 106

#define ID_EDIT_UNDO 200
#define ID_EDIT_CUT 201
#define ID_EDIT_COPY 202
#define ID_EDIT_PASTE 203
#define ID_EDIT_LINK 204

#define ID_HELP_CONTENTS 300
#define ID_HELP_SEARCH 301
#define ID_HELP_HELP 302
#define ID_HELP_ABOUT 303
#define ID_HELPTOPICS 304
EOF
cat > generic.rc << EOF
#include "windows.h"
#include "winver.h"
#include "resource.h"

LANGUAGE LANG_RUSSIAN, SUBLANG_DEFAULT

/////////////////////////////////////////////////////////////////////////////
//
// Menu
//

GENERIC MENU
BEGIN
POPUP "&" c<"
BEGIN
MENUITEM "'R¤& вм\tCtrl+N", ID_FILE_NEW, GRAYED
MENUITEM "&_вЄалвм...\tCtrl+O", ID_FILE_OPEN, GRAYED
MENUITEM "&'Rеа -Ёвм\tCtrl+S", ID_FILE_SAVE, GRAYED
MENUITEM "'Rеа -Ёвм &Є Є...", ID_FILE_SAVE_AS, GRAYED
MENUITEM SEPARATOR
MENUITEM "&__з вм...\tCtrl+P", ID_FILE_PRINT, GRAYED
MENUITEM "_ а &┐_вал бва -Ёжл...", ID_FILE_PRINT_SETUP, GRAYED
MENUITEM SEPARATOR
MENUITEM "'&леR¤\tAlt+X", ID_FILE_EXIT
END
POPUP "&_а ўЄ "
BEGIN
MENUITEM "&_в┐_-Ёвм\tCtrl+Z", ID_EDIT_UNDO, GRAYED
MENUITEM SEPARATOR
MENUITEM "&'ла_ вм\tCtrl+X", ID_EDIT_CUT, GRAYED
MENUITEM "&_RЇЁаRў вм\tCtrl+C", ID_EDIT_COPY, GRAYED
MENUITEM "&'бв ўЁвм\tCtrl+V", ID_EDIT_PASTE, GRAYED
MENUITEM "'бл&<Є ", ID_EDIT_LINK, GRAYED
END
POPUP "&'Їа ўЄ "
BEGIN
MENUITEM "&'R¤_а│ -Ё_", ID_HELP_CONTENTS, HELP
MENUITEM "&_а_¤┐_в-лc гЄ в_<м...", ID_HELP_SEARCH, HELP
MENUITEM "_ бЇ&а ўRз-Rc бЁбв_┐_", ID_HELP_HELP, HELP
MENUITEM SEPARATOR
MENUITEM "&_ ЇаR_а ┐┐_...", ID_HELP_ABOUT
END
END

LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US

/////////////////////////////////////////////////////////////////////////////
//
// Menu
//

GENERIC MENU
BEGIN
POPUP "&File"
BEGIN
MENUITEM "&New\tCtrl+N", ID_FILE_NEW, GRAYED
MENUITEM "&Open...\tCtrl+O", ID_FILE_OPEN, GRAYED
MENUITEM "&Save\tCtrl+S", ID_FILE_SAVE, GRAYED
MENUITEM "Save &As...", ID_FILE_SAVE_AS, GRAYED
MENUITEM SEPARATOR
MENUITEM "&Print...\tCtrl+P", ID_FILE_PRINT, GRAYED
MENUITEM "P&rint Setup...", ID_FILE_PRINT_SETUP, GRAYED
MENUITEM SEPARATOR
MENUITEM "E&xit\tAlt+X", ID_FILE_EXIT
END
POPUP "&Edit"
BEGIN
MENUITEM "&Undo\tCtrl+Z", ID_EDIT_UNDO, GRAYED
MENUITEM SEPARATOR
MENUITEM "Cu&t\tCtrl+X", ID_EDIT_CUT, GRAYED
MENUITEM "&Copy\tCtrl+C", ID_EDIT_COPY, GRAYED
MENUITEM "&Paste\tCtrl+V", ID_EDIT_PASTE, GRAYED
MENUITEM "Paste &Link", ID_EDIT_LINK, GRAYED
END
POPUP "&Help"
BEGIN
MENUITEM "&Contents", ID_HELP_CONTENTS, HELP
MENUITEM "&Search for Help On...", ID_HELP_SEARCH, HELP
MENUITEM "&How to Use Help", ID_HELP_HELP, HELP
MENUITEM SEPARATOR
MENUITEM "&About Generic...", ID_HELP_ABOUT
END
END
EOF
rc generic.rc
cl /nologo /MDd /Zi /D_UNICODE /DUNICODE generic.c generic.res user32.lib

Thread issue

Shay Harel3-Jun-04 5:16

Shay Harel

3-Jun-04 5:16

Hi,

I use a thread in my app and in one portion of the code, the thread call another class. This class trie to pop up a window but get's a handle of 0x0000. Look like the Create or CreateIndirect fails.....

<br />
CWaitDlg *w=new  CWaitDlg ("","Please Wait"); //<-- this will return a 0x0000<br />
w->Create (IDD_WAIT);   <br />
w->ShowWindow (SW_SHOWNORMAL);<br />
<br />

Re: Thread issue

John M. Drescher3-Jun-04 5:49

John M. Drescher

3-Jun-04 5:49

The handle will always be 0 until you actually create the window.

John

Re: Thread issue

Shay Harel3-Jun-04 5:57

Shay Harel

3-Jun-04 5:57

You are right.
The problem starts when I use the Create function.....

Re: Thread issue

basementman3-Jun-04 6:40

basementman

3-Jun-04 6:40

Is the thread that creates this based on a UI type thread or a background worker thread? If you are using MFC (which it appears), this is very important, as you should only create UI elements with a UI thread. See AfxBeginThread() in the Docs for more info.

onwards and upwards...

Re: Thread issue

John M. Drescher3-Jun-04 7:33

John M. Drescher

3-Jun-04 7:33

I agree this is essential with MFC and the GUI.

John

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.