Re: wm_create problems - C / C++ / MFC Discussion Boards

sorry, just to add on, i have also used GWL_USERDATA instead of DWL_USER if that makes a difference, thanks

"We have done so much in the last 2 years, and it doesn't happen by standing around with your finger in your ear, hoping everyone thinks that that's nice." - Donald Rumsfeld

Jason Henderson
blog

Thanks for the help, i applied all the stuff that was in that article, and it still didn't work, i also started to use WNDCLASSEX instead of WNDCLASS, but all that has done is stopped me from being able to register my class.

i type:

RegisterClassEx(&myWndClassEx);

and it throws an error, i printed the error with GetLastError, and the code is dec 87 or 0x57 and i don't know what that is or where to find the definition, this is becomming a major dilemna, any more help would be greatly appreciated

I've been working really hard on this now and i have finally figured out that my real problem is in CreateWindowEx

it is giving a return error of 6, which i found out is 'invalid handle' i think that is pointing at my hinstance, to instantiate my hinstance i call GetModuleHandle(NULL) and that is in a cpp file that is compiled into a static library, if this helps, that's great, i really need a fix for this problem, Thank you very much in advance if you can tell me what to do.

WinMain should give you an hInstance you can use.

"We have done so much in the last 2 years, and it doesn't happen by standing around with your finger in your ear, hoping everyone thinks that that's nice." - Donald Rumsfeld

Jason Henderson
blog

i don't know what is happening now, i have used hInstance AS delivered by winmain, but my createwindowex is stilling failing and when i call getlasterror, i get a code of 0 which apparently means success, this is extraordinarily frustrating, thank you for your help so far, but this is just rediculousl annyoing, thank yuou for any further help WTF | :WTF:

Can you post some actual code or send it to me?

"We have done so much in the last 2 years, and it doesn't happen by standing around with your finger in your ear, hoping everyone thinks that that's nice." - Donald Rumsfeld

Jason Henderson
blog

this is my create window method:

bool GLWindow::CreateGLWindow(HINSTANCE hInstance //this is hInstance passed by WinMain)
{
ofstream emsg ("ERROR.txt"); //this is where i have been putting my errors
GLuint PixelFormat;
DWORD dwExStyle;
DWORD dwStyle;
RECT WindowRect;

WindowRect.left = (long)0;
WindowRect.right = (long)m_aResolution[0]; WindowRect.top = (long)0;
WindowRect.bottom = (long)m_aResolution[1];

m_hInstance = hInstance;
WNDCLASSEX l_wc =
{ sizeof(WNDCLASSEX),
CS_GLOBALCLASS | CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
(WNDPROC) WndProc,
0,
0,
m_hInstance,
LoadIcon(NULL, IDI_WINLOGO),
LoadCursor(NULL, IDC_ARROW),
NULL,
NULL,
m_StrTitle,
LoadIcon(NULL, IDI_WINLOGO),
};

if (!RegisterClassEx(&l_wc))
{
emsg << GetLastError();
MessageBox(NULL,"Failed To Register The Window
Class.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}

/*********************************my class registers fine, no problem at all*********************/

dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
dwStyle=WS_OVERLAPPEDWINDOW;

AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);

if (!(m_hWnd=CreateWindowEx(dwExStyle, m_StrTitle, m_StrTitle,
dwStyle |
WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
0, 0, WindowRect.right-WindowRect.left,
WindowRect.bottom-WindowRect.top,
NULL,
NULL, m_hInstance, this)))
{
/*************************************************************************************************
this is where the failure is, but the error code that gets printed is zero (which is enumerated as ERROR_SUCCESS) which i don't get at all, i don't know if i am somehow getting the wrong error code or what!!
*************************************************************************************************/
emsg << GetLastError();
emsg.close();
this->KillGLWindow();
MessageBox(NULL,"Window Creation Error","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false;
}

****NOTE: i nocked off the rest of the code because it works, and it doesn't do anything but take up a lot of space in this post.

Your help so far has been great, thank you for your continued support
-Matthew

From the CreateWindowEx documentation:

This function typically fails for one of the following reasons:

*an invalid parameter value
*the system class was registered by a different module
*the WH_CBT hook is installed and returns a failure code
*the window procedure fails for WM_CREATE or WM_NCCREATE

Check your params and your wndproc.

"We have done so much in the last 2 years, and it doesn't happen by standing around with your finger in your ear, hoping everyone thinks that that's nice." - Donald Rumsfeld

Jason Henderson
blog

Add this line to your code

wc.style = CS_GLOBAL;
//initial other fields

RegisterClassEx(&wc);

CS_GLOBAL isn't a field in style, i can't set it to that, it tells me 'CS_GLOBAL': undeclared identifier
also, for some reason, i am being told that the paramter is incorrect when i try and register my class

In fact it's CS_GLOBALCLASS,I've forgotten a word.
When you call CreateWindow or CreateWindowEx,the function will compare the hInstance you passed to it to the hInstance of the WNDCLASSEX hInstance field.
Set the style field to CS_GLOBALCLASS tells the function that it should not compare these two values.

Hello all,
I created a Month calendar control into my form, and I want to use it as a date picker, so when the user selects a date, I will fill other CEdit controls with the date selected.

But I realize that within MCN_SELECT, the value associated with my Calendar Control, gets the wrong date.

void CPlanmView::OnSelectMonthcalendar1(NMHDR* pNMHDR, LRESULT* pResult)
{
// Users Selects a Date, so MCN_SELECT triggers this.
// User selected October 31, 2003 but returns
// Feb,10,2004
*pResult = 0;
UpdateData();
m_DayPlm.Format("%d",m_CalendarVal.GetDay());
m_MonthPlm.Format("%d",m_CalendarVal.GetMonth());
m_YearPlm.Format("%d",m_CalendarVal.GetYear());
UpdateData(FALSE);
}

I have also seen the sample provided in the msdn, and it has the same problem, for this control.

Any Ideas on how to workaround this issue.

Best,
-Alfredo

I just found the answer for this problem

Microsoft Knowledge Base Article - 235355

I post it here for reference in case somebody else has to deal with this.

The Microsoft article says this behaviour is by design, and SYSTEMTIME should be used instead of CTime class

Best,
Alfredo

I need an accounting program that is able to keep track of inventory, orders, account receivable and others.
I would need the ocde in order to create custom fit program.
Are this type of programs available including the source. What are my best alternatives?
Thank you

Hi All.
Why does Windows need a registry ? (Or at least: Why does Windows let programmers stuff with it ?)
I can't see why any program settings can't be stored in a file within the directory that the app is installed to. It can just load that file and read what it is supposed to do each time it runs.
It amazes me that this practice is so common and even promoted (Even here on CP). If I want my computer to behave differently: I'll tell it...not some scumbag programmer who thinks they know better!
Maybe there is a need for a "Read-Only" Windows registry for windows settings to be passed to the program.
Anyone ? Discussion ?
(Quite a rant, but it didn't belong in the Lounge).
Cheers

If sex is a pain in the ass, then you are doing it all wrong!

wogerdoger wrote:
Why does Windows need a registry ?

Windows needs a registry to store settings that are generally not changed often. Have you ever worked on Linux? Linux has thousands of configuration files stored all over the place which makes it a real pain to configure but this is buy design. Since companies can not sell the software but they can sell the support. They have to make it as hard to setup as you can get away with so there is a reason to use the very expensive support services.

John

John M. Drescher wrote:
Have you ever worked on Linux? Linux has thousands of configuration files stored all over the place which makes it a real pain to configure but this is buy design.

Indeed, GNOME and GNOME-based apps under Unix now store application data in a central registry called gconf. Apps can "listen" to their gconf keys and be notified when the user (or another app, like a preferences applet) changes the value. Seems the GNOME people at least saw the advantages of a centralized, cacheable, uniform-format configuration system Smile | :)

- Mike

Thanks for the info. I did not know that about GNOME.

John

The registry is also a single point of failure. Frown | :(

--
The coolest game in the world: NHL Hockey[^]

Lounge *coughs* Smile | :)

I agree partially...I always thought polymorhpic executables would be a better solution still. That way program registry data goes where the program goes. However in defense of Windows registry, I think under some circumstances it's required. You need a standard single location so programs can commumicate if required. I would think that Office suite would be a good example, in that Outlook can probably check the registry for Word's existance and see if spell check is installed if so then enable spell checker for outlook. I don't know if this is how they really accomplish tasks or if they use OLE or something, but it serves as an example of what I mean. If programs stored all data in specialized data files 2 programs that are not related in any way would have a hard time communicating. Atleast it gives you a place to start looking for program INI stuff Smile | :)

Just my opinion Smile | :)

wogerdoger wrote:
If sex is a pain in the ass, then you are doing it all wrong!

Thats great Laugh | :laugh:

I'm drinking triples, seeing double and acting single Cool | :cool:

Hockey wrote:
However in defense of Windows registry, I think under some circumstances it's required. You need a standard single location so programs can commumicate if required. I would think that Office suite would be a good example, in that Outlook can probably check the registry for Word's existance and see if spell check is installed if so then enable spell checker for outlook. I don't know if this is how they really accomplish tasks or if they use OLE or something, but it serves as an example of what I mean.

Good point.

John

As a programmer I design my software to use both registry and ini files. For the things that the user may need to change or move from pc to pc I put it in ini files. For the small items (less than a KB of data) that the user will never change directly I put in the registry.

John

I would much rather use the registry because:

all aspects of the computer are stored in one central place.

it is way more hierarchical that INI files; can store more data, and different types of data.

the registry can be secured.

That said, INI files have the same type(s) of arguments. Each are a tool for solving a problem, and like most tools, they can be a benefit, or they can abused and become a hindrance.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Isn't it the purpose of "Application Data" ( or "Local Settings\Application Data" under "Document and Settings" ) the new preferred place to place user settings ?

Also, having only a part of the registry, HKEY_CURRENT_USER, writable should limit the damages.

Maximilien Lincourt
"Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )