C / C++ / MFC

20-Dec-04 4:30

Hai All,

In my application InitInstance method the DoModal() calling of main application dialog return -1(bcoz of some loading problem). but i want to capture it and show some error mesage. But i cann't show any error message or any other dialog when it returns -1.

How i can i solve this problem.

ANyone can have any idea?

regards

Ans

toxcct20-Dec-04 5:47

toxcct

20-Dec-04 5:47

use GetLastError()

TOXCCT >>> GEII power
[toxcct][VisualCalc]

David Crow20-Dec-04 6:16

David Crow

20-Dec-04 6:16

AnsGe wrote:
But i cann't show any error message or any other dialog when it returns -1.

The reason is most likely here.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

AnsGe20-Dec-04 6:55

20-Dec-04 6:55

Hai,

I tried with ur help. But my problem still remains.
If main window is successfully loaded then it is possible to show any mesagebox. But the main window Domodal() failed then it is not possible to show a MessageBox. The code snip running, but windows are not visible

Thanks

Anish

David Crow20-Dec-04 8:12

David Crow

20-Dec-04 8:12

AnsGe wrote:
...then it is not possible to show a MessageBox.

Did you comment out the m_pMainWnd = &dlg statement in the app's InitInstance() method?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Michael Dunn20-Dec-04 7:25

Michael Dunn

20-Dec-04 7:25

Whenever I've had DoModal() return -1 it was due to the dialog using a control whose window class wasn't registered yet. If you're running an older OS and are using any Win 95 common controls, check that you're calling InitCommonControls() in your init code.

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb

AnsGe20-Dec-04 7:35

Checking an ocx is installed or not

20-Dec-04 7:35

hai,

Thanks for ur reply.
i know the exact reason why it retuns -1. bcoz one my ocx is not installed in the machine. But i want to capture the situation and want to display error message.

I have done all hte initialisations in the InitInstance

Thanks

Ans

AnsGe20-Dec-04 4:21

20-Dec-04 4:21

Hai All,

How can i check an ocx which is droped in my main application dialog is installed or not. I not used the CoCreateInstane function , but i directly placed the control in my dialog. The application crashes when the control is not installed.

How can i avoid it?

Thanks in Advance

Ans

Blake Miller20-Dec-04 6:11

Blake Miller

20-Dec-04 6:11

You can try the CoCreateInstance before attempting to display the dialog. If that fails, do not show the dialog.

AnsGe20-Dec-04 6:47

20-Dec-04 6:47

Hai,

Actually i don't know the internal structure about the used COM component. Its a 3rd party control and i have only know some functions in it. I dont know any classid and interface id's.

So how can i call CoCreateInstance()

Byy

Anish

Blake Miller20-Dec-04 7:05

Blake Miller

20-Dec-04 7:05

Just trying to help here, but maybe you can use this:

HRESULT CLSIDFromProgID(
LPCOLESTR lpszProgID,
LPCLSID pclsid
);

You have to already know what the name of the OCX object is to use the function.

Otherwise, you might need to manually search the registry to find where the OCX is installed, find the OCX, see what it's GUID is, and then try to use the CoCreateInstance.

help: Windows MessageBox prevents custom dialog from showing?

naren-vc21-Dec-04 22:32

naren-vc

21-Dec-04 22:32

hi ans,
cocreateinstance is not required to instantiate the activex. i think your problem is u r not included the call to AfxEnableControlContainer(). it ll intializes the framework needed for the activeX container

naren

heman15420-Dec-04 3:19

heman154

20-Dec-04 3:19

I have a gui application that is launched via createprocess(...) from another gui application (that subsequently kills itself). This new application creates a secondary thread that creates a dialog (hidden) at thread creation. I am looking for windows shutdown requests on this secondary dialog (using onQueryEndSession()), and then attempt to show this dialog. It works correctly for most cases (e.g. when I press ctrl+alt+delete and then select shutdown), but sometimes I get a "System Settings Change" Message Box which appears after new devices installed. In this scenario, my application catches and prevents the shutdown request, but fails to throw up the dialog when I use ShowWindow(SW_SHOWNORMAL) (by the way, its modeless). Does anyone know why a messagebox like this would cause this behaviour? I found that uninstalling a device brings up a similar messagebox (same caption, different text), but in this test my modeless dialog does appear. Any suggestions would be appreciated.

Thanks,
Himanshu

Alphablend question

__makaveli__20-Dec-04 3:03

__makaveli__

20-Dec-04 3:03

I am using the AlphaBlend function with an image on a transparent window to fade the image in with a timer and an alpha value incrementing from 1 to 255 as the timer fires (I'm redrawing using InvalidateRect), how can I fade the window back out? If I use the same redraw function and decrement the alpha value the images stays the same.

Am I going about it the right way? Is there a way to fade out?

Michael Dunn20-Dec-04 7:30

Michael Dunn

20-Dec-04 7:30

If the window you want to fade is a top-level window, use AnimateWindow() with the AW_BLEND flag.

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb

__makaveli__20-Dec-04 8:02

__makaveli__

20-Dec-04 8:02

Thanks for the reply, I tried AnimateWindow() before but I keep getting the error that it is an undeclared identifier even when I include windows.h as specified in the MSDN Library. What am I doing wrong?

Michael Dunn20-Dec-04 8:37

Michael Dunn

20-Dec-04 8:37

See the FAQ
2.2 I'm trying to call a Windows API, but the compiler gives an undeclared identifier error (C2065). Why?[^]

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb