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I have never used the #pragma pack and documentation is a little obscure as to how to use it. I was wondering if you could give me an example based on my sampel code which I provided in my previous post.
Thanks in advance!
Clint
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Thanks for you help. I figured out how to use the #pragma pack and it did the trick. You can just ignore the last reply. Thanks again.
Cheers,
Clint
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hi,
is it neccessary to clear or delete the handle from CreateEvent()?
if i just create a new HANDLE and hold with variable holding previous HANDLE from CreateEvent(), will there anything wrong after long run?
thanks,
jim
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you need to close any handles you dont need
explicitly by using CloseHandle or by using any
function with respect to the particular operation
you are doing which properly releases the resources.
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hi,
do you any method that i can check whether my event object still be in the kernel if i don't execute CloseHandle()?
in my case, i run CreateObject again and again, and put the return handle to cover the previous handle. so, i don't know the previous event object has been destroyed in kernel or not.
do you know any tools to check about this?
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Hello!
I have a simple requirement, I need to make an ActiveX EXE Server using ATL COM and call it from VB. I have to create a simple ATL Object and add a method to it which returns another simple ATL COM Object (which I have also created in the same project) to the caller. Although I can write simple methods using the wizard, I am unable to pass the second object.
I am quite new to VC++ and any help would be greatly appreciated.
Thank you.
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SA wrote:
return a COM Obj from ATL
Ok, first of all you cannot return any objects.
What you can do is return an interface pointer
preferably IDispatch and the vb client will
interact thru it.
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If I understand what you are trying to say, why don't you just create the second object like you did the first, and just retrieve the IUknown pointer... That is to say treat it as you would treat other one as the first one.
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Well, as I had pointed out, I am new to this env. and need a little more elaborate answer.
I created an ATL COM Project.
I added a Simple COM Object.
I added a second simple COM Object.
Now I want to add a method to the first one which takes a few String Parameters and returns (an interface pointer to??) the second object.
Can I get some example for the IDL and the function itself, which creates and returns the second COM Object ?
Thanks in advance.
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What I was recommending is just create the new Object the same way you created the first one but apparantly by reading your new message I understand what you want to do is something a little different.
First of all you can't just return new Object and just cast that to IMyInterface*(If you want the reasons let me know). So what you need to create the first object with Aggretable support. Then create the second simple object using createInstance in the first Object(you will be passing the IUnkonwn* of the first object). Add the COM_INTERFACE_ENTRY_AGGREGATE() macro in the COM map. Dont forget to decrement the reference count when you dont need the second object(remember its still considered a COM object). No need to mess with IDL.
Note: There is a Macro similar to the above that takes care of creation and destruction.
If something is still unclear or need help with a specific part of the code let me know.
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I need to write a DLL and my books don't have a good explanation of how to do so. Any tutorials on the basics?
-Raffi
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There's a secion here on CodeProject that has DLLs, system stuff, etc. There is an article called the ultimate DLL Header file, which explains the ways of how to declare functions to be exported, etc.
Even if you win the rat race, you're still a rat.
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Also, MSDN is a good place to start.
Best regards,
Alexandru Savescu
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I saw where someone was having this same problem and it referenced a post that didn't show up so I am sorry but I must ask it again.
When I load the CTreeCtrl programmatically the checks do not show up. I have done Invalidate and all that and the only way I can get them to show up is if I show the control then empty it and read in the information again (I am buildiing it based on a XML file. I can't see any reason why I am getting this behaviour and have worked on it for a couple of days with nothing but a headache. Thank you very much if you can figure this out. I hope it isn't a stupid rookie mistake.
Bill
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I figured it out. If you create the treectrl with the style tvs_checkboxes you must modify its style to remove that style then add it back. Or just create it without that style then do a modify and add it.
Bill
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Hi !
I'm creating context menu's for a view dynamically (by code and depending on some conditions).
Is there a way to dynamically connect Accelerator Keys to this context menu or do I have to write a mechanism catching the WM_KEYDOWN or a similar message to implement that ?
[I'm using VC++ 6 & MFC, but some WinAPI-Calls to make that possible would also help]
Regards, Marco
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Hi,
I think you can create an Accelerator table and load
it dynamically. Have a look at the foll functions
- CreateAcceleratorTable
- CopyAcceleratorTable
- LoadAccelerators
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Try overloading the document methods below as:
HACCEL CMyDoc::GetDefaultAccelerator()
{
if (m_hAccelTable == NULL)
LoadAccelTable(MAKEINTRESOURCE(IDR_EDIT));
return m_hAccelTable;
}
BOOL CMyDoc::LoadAccelTable(LPCTSTR lpszResourceName)
{
ASSERT(m_hAccelTable == NULL); // only do once
ASSERT(lpszResourceName != NULL);
HINSTANCE hInst = AfxFindResourceHandle(lpszResourceName, RT_ACCELERATOR);
m_hAccelTable = ::LoadAccelerators(hInst, lpszResourceName);
return (m_hAccelTable != NULL);
}
Also overload this in the Main Frame derived class:
HACCEL CMainFrame::GetDefaultAccelerator()
{
HACCEL hAccelTable = m_hAccelTable;
// Get the active MDI child window.
CMDIChildWnd *pChild = (CMDIChildWnd *) GetActiveFrame();
// or CMDIChildWnd *pChild = pFrame->MDIGetActive();
// Get the active view attached to the active MDI child
// window.
if (pChild)
{
CView* pView = (CView*) pChild->GetActiveView();
if (pView)
{
CDocument* pDoc = pView->GetDocument();
if (pDoc)
hAccelTable = pDoc->GetDefaultAccelerator();
}
}
return hAccelTable;
}
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I have created a ATL/COM project in VC6 that will run as a service. Then I added a OLE DB Provider and modified it to just return 2 rows of a very simple record layout.
It compiles with no errors or warnings!
Then I launch Visual Basic and create a standard exe projekt, the first thing I do is to add a DataEnvironment Designer. When I open the property dialog on "Connection1" I get a list of providers to choose from, and my provider is listed there.
When I select the provider I have created and presses next button, I get an error message saying something like this: "The provider is not available, check that you have installed it correctly" !!!!!!
What have I missed? How do I install/register my provider?
Is it not possible to have OLE DB providers in an ATL/COM project running as a service?
I have ofcourse started the service!
Don't give me a RTFM, cause I have!
Confused
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Hi,
How can I use SystemTray tooltip text up to 256 characters (or more)?
Today it seems to only support 64 characters.
Thanks
Ola Carlsson
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Is there a way to allow an application to permanetly delete itself(file) after exiting or after a period of time.
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One way is to create a .bat file that deletes the .exe file and then itself. .bat files are loaded into memory and closed before execution, so a .bat can delete itself, where a .exe cannot.
You may have to do something to make the .bat wait until the app has been unloaded.
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Further on using .bat file,
This .bat file can be called from ur application.Execute this .bat file in applications destructor/exit function.
Other method,
Try to use close function .I am not very sure on this
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Check this Thread:
http://www.codeproject.com/script/comments/forums.asp?forumid=1647&app=50&tid=153951&select=153964#xx153951xx
Mazy
"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down
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you can have it deleted on system restart by using the MoveFileEx() function, with the MOVEFILE_DELAY_UNTIL_REBOOT flag set and the destination parameter NULL. See the docs.
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