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Hello.
I am having trouble capturing the mouse wheel messages. Everything works except when WM_MOUSEWHEEL is called, the HIWORD of wParam (combination of WHEEL_DELTAs, positive value means wheel is moved away from the user, negative is towards) is always 0. What is the problem? I am using Visual Studio 2003 btw.
// mousehook.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "mousehook.h"
#define MAX_LOADSTRING 100
HHOOK MouseHook;
static LRESULT CALLBACK MouseProc(UINT nCode, WPARAM wParam, LPARAM lParam)
{
if(nCode < 0)
{
CallNextHookEx(MouseHook, nCode, wParam, lParam);
return 0;
}
int zDelta = ((short)HIWORD(wParam));
if(wParam == WM_MOUSEWHEEL) // This is called properly. I need to know which way the wheel moves, but zDelta is always 0. What could be the problem?
{
}
return CallNextHookEx(MouseHook, nCode, wParam, lParam);
}
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
MouseHook = SetWindowsHookEx(WH_MOUSE_LL, (HOOKPROC)MouseProc, hInstance, 0);
MessageBox(0,"Press ok to unhook","Hooked",0);
UnhookWindowsHookEx(MouseHook);
return 0;
}
I would really appreciate it if someone helped me..please.
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how can wParam be equal to WM_MOUSEWHEEL and, at same time, give you meaningful info about wheel delta?
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-- Iain Clarke
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Sorry forgot to mention..
http://msdn2.microsoft.com/en-us/library/ms645617(VS.85).aspx[^]
wParam
The high-order word indicates the distance the wheel is rotated, expressed in multiples or divisions of WHEEL_DELTA, which is 120. A positive value indicates that the wheel was rotated forward, away from the user; a negative value indicates that the wheel was rotated backward, toward the user.
so ((short)HIWORD(wParam)) should give me what i want, but it gives me 0 all the time.
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sdfghjkqwer wrote: so ((short)HIWORD(wParam)) should give me what i want, but it gives me 0 all the time.
It's a sign thing. the HIWORD macro returns a WORD which is 16bit unsigned integer. The compiler is silently doing some sign extension/conversion magic for you, before casting to a short.
The document page you linked to has a (different) way of getting zDelta - why not use that method?
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How? Please explain, I'm new to programming 
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sdfghjkqwer wrote: How?
By reading the Remarks section.
"Love people and use things, not love things and use people." - Unknown
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Oh I tried that long time ago. It is the same thing as using ((short)HIWORD(wParam));
It doesn't work.
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// Using this instead
SetWindowsHookEx(WH_MOUSE, ...
static LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if ((nCode==HC_ACTION) && (wParam==WM_MOUSEWHEEL)) {
MOUSEHOOKSTRUCTEX* pMH=(MOUSEHOOKSTRUCTEX*)lParam;
WPARAM param=pMH->mouseData;
short zDelta=(short)HIWORD(param);
TRACE("zDelta = %d\n",zDelta);
/*
Output in trace for wheely going up
zDelta = 120
Output in trace for wheely going down
zDelta = -120
*/
}
return CallNextHookEx(MouseHook, nCode, wParam, lParam);
}
<div class="ForumMod">modified on Monday, April 14, 2008 5:48 PM</div>
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I cant find where MOUSEHOOKSTRUCTEX or TRACE are defined
is this it?
typedef struct {
MOUSEHOOKSTRUCT MOUSEHOOKSTRUCT;
DWORD mouseData;
} MOUSEHOOKSTRUCTEX, *PMOUSEHOOKSTRUCTEX;
what bout trace?
Thanks.
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Oops, I forgot about that. Yep, I have
typedef struct {
MOUSEHOOKSTRUCT MOUSEHOOKSTRUCT;
DWORD mouseData;
} MOUSEHOOKSTRUCTEX, *PMOUSEHOOKSTRUCTEX;
The TRACE is just something to use in MFC apps. If you don't use MFC, just ignore it and use printf or something of the sort. I was just trying to demonstrate the value of zDelta and needed an output mechanism.
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There are LOTS of utilities (executables) for mounting ISO files to drive letters, but I want to open and read the contents of an ISO file through some kind of library, not a separate EXE. Any way to do that? I don't mind mind mounting the ISO to a drive letter or directory, I just don't want to make the user do it manually.
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You could add the ISO reading functionality to a DLL or COM Object and use it that way.
You'll probably have to write the ISO code yourself, but it's not too difficult and there is a full ISO spec on the web.
Google for ISO9660, Joliet, etc, here is the wikipedia[^] entry for example.
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It's not that critical, just a "nice to have" for my app. Besides, if it was that easy, it seems like there would already be a free code library available for this. Heck, my boss may even be willing to pay a reasonable price for one.
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Hi, I added code for supporting multiple languages and are suprised about the following behaviour of Windows XP.
I have an English Windows version and selected English (United Kingdom) as my user interface language, I verified this in Control Panel -> Regional and Language Options. The function GetUserDefaultUILanguage from kernel32.dll returns 0x0409 (ENU, United States) and GetSystemDefaultLangID returns 0x0809 (ENG, United Kingdom)... shouldn't they both return the same?
Thanks for help
/M
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What does GetUserDefaultLangID() and GetThreadLocale() return? I've always used those.
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Jim Crafton wrote: GetUserDefaultLangID()
A current user locale - formatting stuff mostly, like currency, and date/time. Can be set from Control Panel->"regional and language options"->"regional options" tab.
Jim Crafton wrote: GetThreadLocale()
The same as the user locale - only on per-thread basis. It can be set programmatically.
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GetSystemDefaultLangID() returns the system locale. This is used to determine which code page is used for non-Unicode (aka "ANSI") text on a system. It can be changed (on XP) from the advanced tab on the "regional and language options" in Control Panel (probably needs to be rebooted before the change takes effect)
GetUserDefaultUILanguage()
returns the current UI language which can be set by a user if MUI pack is installed.
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Thanks for the info. What I don't understand that if I detect the language according to MSDN[^] then I would detect the wrong language (in a case where both UK and US language resources are available for an application).
GetUserDefaultUILanguage() Win32 API: 0x0409 US English
GetSystemDefaultUILanguage() Win32 API: 0x0409 US English
GetSystemDefaultLangID() Win32 API: 0x0809 UK English
What would be the correct order in an application to check?
modified on Monday, April 14, 2008 12:21 PM
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Moak wrote: What would be the correct order in an application to check?
I am not sure what you are trying to check from your application. The link you left points to the article explaining how MFC is choosing a satelite dll.
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Nemanja Trifunovic wrote: I am not sure what you are trying to check from your application. The link you left points to the article explaining how MFC is choosing a satelite dll.
Quote from MSDN: MFC attempts to load the resource DLL for each of the following languages in order, stopping when it finds one.
It starts with GetUserDefaultUILanguage(), which returns ENU (US English) on my computer which is wrong as I have ENG (UK English). If the application is delivered with both US and UK english satelite DLLs, the wrong English language would be auto detected.
/M
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Moak wrote: It starts with GetUserDefaultUILanguage(), which returns ENU (US English) on my computer which is wrong as I have ENG (UK English).
Based on what you described it is not wrong. The value returned by GetUserDefaultUILanguage() can be set by the user on XP Pro with MUI pack installed with the "Language used in manus and dialogs" option only.
What exactly did you do to set the language to UK English in Control Panel? My guess is that you changed either user locale (dates, currency, etc), input locale (kayboard) or both, but it does not affect the default UI language.
The value GetUserDefaultUILanguage() returns tells about the language of the menues, etc in Windows. As I said, you can't change it with Windows XP unless you have MUI pack installed.
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Well, thanks for taking the time to explain! To answer your question, in the control panel -> Regional and Language Options -> tabs (Regional/Languages/Advanced) the language is set to "English (United Kingdom)", I didn't change it after Windows installation. I don't have a MUI pack installed as far as I know.
I think something is wrong... because with my settings I would expect "English (United Kingdom)" to be detected... but I am not sure what it is (my code or the explanation in the MSDN article).
Cheers!
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Moak wrote: Well, thanks for taking the time to explain!
You're welcome. I know international programming can be frustrating - after all I worked in language/localization industry 7 years before I finally had enough
Moak wrote: in the control panel -> Regional and Language Options -> tabs (Regional/Languages/Advanced) the language is set to "English (United Kingdom)",
OK. If you read carefuly the explanation on that tab, you'll see that it sets the "Language for non-Unicode programs", or "system locale". What it does is determine which code page is used for multibyte ("ANSI") characters. For instance, when you use MultiByteToWideChar function, and set the CodePage parameter to CP_ACP, it will be this setting that decides from which multibyte encoding we are converting to Unicode. Mind you, all Windows API functions internaly do that if the application does not compile as UNICODE. This value gets returned by GetSystemDefaultLangID as you already noticed.
However, GetUserDefaultUILanguage does not look into this setting at all! It returns the language in which the UI controls of your OS are rendered (and MFC correctly looks at that one first - after all you would want your application to e displayed in the same language as the OS). This setting you can change on Windows XP Pro only if you have MUI pack installed, and in that case you'll have a combo box "Language used in menues and dialogs" displayed in the "Language" tab in the Control Panel "Regional and Language Options". Otherwise, it is just predetermined by the version of Windows you installed (En-UK, or En-US) and you can't change it.
Hope it is a little clearer now
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All of the answers you seek can be found by reading the articles from Dr. International.[^]
The only question he cannot answer is about his true identity which is a closely guarded secret.
Best Wishes,
-David Delaune
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Randor wrote: The only question he cannot answer is about his true identity which is a closely guarded secret.
Dr International is a nickname for a group of people, and their names can be found in the "Acknowledgements" section of their book[^]
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