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Hi friends
If i want to code a big project in C++ in VS2005 which road must i follow?What do you advice me?
Especially i want to design it with plugin support.I write it skeleton, then other parts will be plugin or it can be developed by other coders.I want to learn what must i prepare before start coding.How must projects settings be for plugin support or for a such a big project.(For great extensibility)
I am looking for your answers.Any links , articles, advices will be very useful for me.
Thanks..
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the easiest way to do a plugin system is with plain-old stdcall/cdecl DLLs. just define an interface (a set of required functions) and document how a plugin should behave within your system. then you just drop the DLLs into a specific folder and your app can do LoadLibrary/GetProcAddr on each *.DLL it finds in that folder.
Cleek | Image Toolkits | Thumbnail maker
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Thanks chris.
Do you know there are any sample applications about that.
Also are there also some information or settings that i must know before start coding?I asked this because i don't want to make mistake and turn back.
Thanks again...
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hi
i can't think of any samples specifically related to "DLL as plugins", but i think just a simple introduction to DLLs using LodLibrary/GetProcAddr would do it. i'm sure there must be a bunch of those around.
i can't think of any special settings, really. just create your DLLs with C interfaces (not "MFC Extention" or COM or .Net), make sure you export the functions with C interfaces (stdcall or cdecl) and make sure you make your function interfaces as flexible as possible, to allow for easy growth (you don't want to be changing the interfaces once people have started writing plugins!).
Cleek | Image Toolkits | Thumbnail maker
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Halllo
I know i'm not realy right here. But i don't know where else to go.
My little software is ready and now i prepare everything for the installer.
I went to another machine to see the dll's i need. So far so good. Now
my App needs MFC71.dll but just copying the dll won't work
The error message is the message title.
Does any one have any suggestions ??
THX
Timen
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from MSDN...
"MFC71.dll does not need to be redistributed with MFC applications if you statically linked to the MFC DLL (that is, unless you specified Use MFC in a Static Library on the General tab in the Project Settings dialog box)."
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I'll try to be brief here because I could go on and on:
We have an existing app which keeps track of employee in/out status. It uses UDP in a client/server architecture.
We are starting to use Remote Desktop and are having some problems with this app. Originally, we kept getting the error that basically said the listen port (on the client app) was already in use. I made the change to allow reuse and that error is now gone.
Now, it seems that the first client to get the notification from the server (in the OnRecieve() call) is the only one that gets data. I have a feeling the data is removed from the socket buffer and the other apps are probably getting a recv length of 0. They may not be getting a notification at all - I need to verify this.
To be a little more clear - we are testing with multiple people logged into the Terminal Server. At the most, only one client works properly at any time.
How can I handle this?
-- modified at 15:53 Wednesday 7th June, 2006
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i found some MDI extension classes called MDI tabbed interface or MTI. By using these classes, we can create tab in the workspace (main frame window) to navigate all the child window in this workspace.
My question is if we also have some classes which can be used to create multiple workspaces at the same MDI application and there is also a tab to navigate the workspaces. And we also can load and store workspace layout file for each workspace seperatedly.
note1: "Workspace" is another name for main frame window in MDI application, there might be several child windows in each workspace.
note2: i know there is a stock trading software call TradeStation, which has already implement this feature in its system.
thanks for all the help.
Bing
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OK, here is what I have done.
I am looking to use a timer to complete some refresh operations every 2 seconds. However, I cannot get my OnTimer()function to be called.
I set up a timer with the following line of code:
SetTimer(1, 2000, 0);
Then, I have the Ontimer function, which I created from ClassWizard as a message handler for WM_TIMER.
That is, I have ON_WM_TIMER declared in my message map.
ON_WM_TIMER()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
Here is my handler:
void CProbeTalkMenu::OnTimer(UINT nIDEvent)
{
m_szStatus += "*";
UpdateData();
CDialog::OnTimer(nIDEvent);
}
OnTimer() is never called. I am afraid that I am failing to do something grossly important. Can anyone explain what my problem might be?
Brett Feero
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Never mind......
UpdateData(); =====> UpdateData(0);
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( with MFC, VC6/VS.net 2003 )
I have 2 docking windows in my MDI application, docking window A can dock on either the left or right side, and docking window B can dock on the bottom.
now, I have something like : where the docking window B takes the whole width of the frame.
--------------------------------------------|
| | |
| Dock| |
| ing | |
| | |
| Wind| |
| ow | |
| | |
| A | |
|-------------------------------------------|
| |
| Docking Window B |
--------------------------------------------|
Is there a way to have the docking windows look like this instead ? :
--------------------------------------------|
| | |
| Dock| |
| ing | Main Window ( child wnd ) |
| Wind| |
| ow | |
| A | |
| | |
| | |
| |-------------------------------------|
| | |
| | Docking Window B |
--------------------------------------------|
Maximilien Lincourt
Your Head A Splode - Strong Bad
-- modified at 14:45 Wednesday 7th June, 2006
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I like to write a program to read several arrays of function of time and then to display these arrays in multiple channels stacked up in a page.
Please help me to get some key code segments to start with.
Thanks
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I have a dialog box with lots of edit controls and some
check boxes and a date time control. Is there an easy
way to know when one of the items has changed, so that
I can then do:
SetModifiedFlag(TRUE);
The only way I can think of right now is to EN_CHANGE
on each and every control and if something changes, then
do:
SetModifiedFlag(TRUE);
Im hoping there is an easier way to know when at least
one control has changed just alittle.
Please, any response any one can give me will be
greatly appreciated.
Sincerely,
Danielle Brina (an overworked graduate student)
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Could you not derive a class from CEdit, and put the ON_CONTROL_REFLECT(EN_CHANGE, ...) code in it?
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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It works but it doesnt work. The function:
ON_CONTROL_REFLECT(EN_CHANGE, OnChange)
calls the OnChange function when an edit box is changed. However,
in this new class, CMyEdit, I cant call:
m_pDocument->SetModifiedFlag(TRUE);
or,
GetDocument().SetModifiedFlag();
Im stumped on calling SetModifiedFlag in the OnChange function.
Please, please, any response you can give me will be greatly
appreciated.
Sincerely,
Danielle Brina (an overworked graduate student)
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When the OnChange() method is called, set a static member variable to true. Add a static method to your CEdit-derived class, something like:
bool CMyEdit::HasChanged( void )
{
return m_bChanged;
}Then in your code that needs to know if any of the edit controls were changed, simply call CMyEdit::HasChanged(). Make sense?
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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WEll for edit controls you can derive them from a common CMyEDit class
and add the following macro
ON_CONTROL_REFLECT(EN_CHANGE, OnChangeVal);
OnChangeVal :- this function will be called on the change of the edit controls
Check for reflect Messages in MSDN.
Regards,
FarPointer
Blog:http://farpointer.blogspot.com/
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I use a slightly modified version of the method described here[^]. I re-calculate the checksum in an OnIdle handler so t is always checked without having to worry about it in any of my other code.
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good, use it!!!
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Hi,
I have a tree control with checkboxes (using the following tip http://www.pocketpcdn.com/articles/checktree.html)
Now I'd like to know how I can retrieve the boxes that have been checked. And if it is possible NOT to display the checkboxes corresponding to some items of the tree (I'd like checkboxes only for the leafs of the tree).
Thanks
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Hi,
Wenever you click the treecontrol item the image coresponding to it is retreived from the imagelist and displayed .
TreeCtrl sends a notificastion message of type TVN_GETDISPINFO .
for this you need to set some flag in the LPARAM in the InsertItem.(check MSDN)
So wen the user clicks the item it send a notification and inside you can maintain the list of items thats are geting checked and wen you uncheck you remove the index from your container.
You can chcek this link:-
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcesdkr/html/_wcesdk_win32_TVITEM_str.asp[^]
Regards,
FarPointer
Blog:http://farpointer.blogspot.com/
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hi,
i want to develop one application in VC++ MFC ,which can insert & retrive data from a database(oracle), through a dll .The Dll is resposible for handling all database operation.
can any please help to work on that...
"EXE" + "DLL" + "DB"
1.how can i make a connection string for oracle database which is in remote system.
2.how can i handle DB opeartion in Dll.
i try with Dll , but it through error
send reply ,,,early 
Try again and again,
At last you will say
I don't know the meaning for impossible.,.
-- modified at 11:37 Wednesday 7th June, 2006
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maharaja pandian wrote: i try with Dll , but it through error
And that error would be what?
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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DavidCrow wrote: And that error would be what?
You sure are nosey, aren't you
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good, use it!!!
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in the Dll file when i try to open DB using the below function it work but
when i try to open the recordset open i.e.,rsOpen() , it open a DataSource dialog screen will opened ,instead of executing a sql query
//////////////////////////////////////////////////////////////////////////
bool CDaoDB::dbOpen(CString strFilePathName)
{
try
{
db = new CDaoDatabase(NULL);
db->Open(strFilePathName);
return true;
}
catch(CDaoException* error)
{
delete db;
db = NULL;
LPTSTR errors = "";
error->GetErrorMessage(errors,100,NULL);
AfxMessageBox(errors);
return false;
}
}
bool CDaoRS::rsOpen(CString sql,CDaoDatabase* db)
{
CDaoTableDef *df;
try
{
if(db)
{
rs = new CDaoRecordset(db);
rs->Open(dbOpenDynaset,sql);
return true;
}
else
{
AfxMessageBox("There is no current database open.");
return false;
}
}
catch(CDaoException* error)
{
delete rs;
rs = NULL;
LPTSTR errors = "";
error->GetErrorMessage(errors,100,NULL);
AfxMessageBox(errors);
return false;
}
}
Try again and again,
At last you will say
I don't know the meaning for impossible.,.
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