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I had posted this query on COM forum, but on advise from Cata re-posting it here.
I'm quite new to VC++ programming. I need to develop an application which has independent pluggable modules (DLL ?) with the core application passing some arrays of data to the plug-ins and getting back the processed data from the plug-in. The core application should run without error even if any corresponding module (plug-in/DLL) is missing at run-time. The core application should also be able to detect any new plug-in and load it dynamically. Any changes to the plug-ins should not require the core application to be re-built.
Grateful if anyone could advise the best possible solution to the above mentioned task - use explicitly linked DLLs or use COM ? Any sample codes or articles available for this?
I'll be using VC++ 6.0. Thanks a lot in advance !
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Keep all ur DLL's in specified Directory and enumerate all files in that directory.
Load ur DLL's at runtime via LoadLibrary and check whether it loaded successfully , if it didn't then assume it is not there and goto next DLL.
Don't use LIB files for DLL's ! otherwise if the dll is not present it will not run
you could add a special function in ur dll e.g
AreYouMine();
which can assure that the dll is urs and it is to be loaded
Hope that helps 
Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi
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Thanks Monty. I'll try that. But do you think COM would be a better solution instead of explicitly linked DLLs?
Cheers and a Happy New year....
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I posted one article on this subject Plug-in architecture for MFC using MESSAGE_MAPS[^]
If you just need function calls etc and not the message map ability, then a lot of the code should still be applicable to what you need. especially the stuff that loads in the available plug-ins etc. It should be a good start to get yourself going if you do not use the actual technique presented.
HTH
Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!
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hi,
i'm writing a program to change the background of a window i don't own. and it almost works.
i subclass the window and intercept the WM_PAINT message, the WM_ERASEBKGND message, and the WM_DESTROY message.
when the WM_PAINT message is received we call the original WndProc with the paint message, we then create a DC and paint our background into it. Then call the WM_PRINT message to the old WndProc and ask it to draw the controls and stuff onto the DC then paint the DC in place (on screen).
we eat the WM_ERASEBKGND messages.
and when we get the WM_DESTROY message we set down.
all other messages are returned to the original process.
this basic layout seems to work but no labels or shapes are drawn (window i'm subclassing was deployed in VB but i assume it will be the same in many apps).
thanks for your help
mdb
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Hi, I am wondering how to create a dialog box in visual c++. I saw a program once that made this very simple, I think the function was _MessageBox and then a cout statement was used to write the text for the box. Does anyone know anything about creating simple dialog boxes? Thanks.
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This is just 1 way of creating the dialog box easily.
-Ganesh
------------------
1)With your project open, from the Insert menu, click Resource.
2)In the Insert Resource dialog box, select Dialog from the list of resource types and click OK. A default dialog box with two buttons labeled OK and Cancel opens up along with a Controls toolbar.
3)Right-click the dialog box, then click Properties on the menu. Click the pushpin on the property page to keep it open.
4)Select a ID for the box from the drop-down menu or name one yourself. select a caption name for the caption box.
5)Save your work.
Now, that you have the basic setup, you can add any # of controls from the controls box.
6) For every control added from the Control box (eg., Button, edit box, static text control) give a unique ID and a nice caption
7) create a new class which has CDialog as its base class.
8) Using Wizardbar> Add Windows Message Handler>, select the ID of the button in "Class or object to handle" menu inside the "New Windows messages to handle" box.
9) Select the appropriate message (eg.,for a button select BN_CLICKED or BN_DOUBLECLICKED) and the click "Add/Edit". say OK.
Now, your dialog box is ready with a frame. To give it life, connect each and every variable to the member variable in the function.
10) View> ClassWizard> ClassName>
select ID and click Add Variable button. In the Member variable name box, specify the variable name you use in your project. From the Variable type list box, click its type and click OK to add the member variable to the class.
You are all set now.
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If you're using MFC, you can do this to display a message box:
AfxMessageBox (_T("Some message"));If you really want to create a dialog box, see this[^] profusely illustrated article for instructions.
/ravi
Let's put "civil" back in "civilization"
Home | Articles | Freeware | Music
ravib@ravib.com
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Hello,
Is it possible to get the amount of RAM on a machine in the network using an API, registery etc. ?
Thanks,
Orcun Colak
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step 1) you should know ATL/Marshalling
step 2) if so, , build Server/Client application, this will solve your problem
or
Purchase "Beginning Atl Com Programming by George Reilly (Author") read 5th and 6th chapter, which gives you full detailed example of reading DISK space in the network using ATL/API, similarly you can build your applications
regards
Balkrishna Talele
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The docs dont indicate what it means when NULL is passed in for the ddbltfx structure..the one place I saw where the ddbltfx str is passed in is when a colorfill is done
lpdds->Blt(@dest,
lpddsback,
&src,
DDBLT_KEYSRC | DDBLT_WAIT,
NULL);
for a fill:
lpdds->Blt(NULL,
NULL,
NULL,
DDBLT_COLORFILL | DDBLT_WAIT,
&ddbltfx);
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Hi everyone. I am VERY new at programming and I am wondering if someone to show me step by step how to do something that I know is incredibly easy. I want to be able to run a program that I write without having to go into the actual workspace and compile and execute it. I would like to know how to just be able to click on an icon or something and have the program pop up w/o using my developer studio. Could someone help please? By the way, I use Microsoft Visual C++ 4.0 so please keep that in mind when replying. Thanks in advance!
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HackerBoy wrote:
I want to be able to run a program that I write without having to go into the actual workspace and compile and execute it.
what you need is a slave.
(no offense  )
modified 12-Sep-18 21:01pm.
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Maybe I posed my question the wrong way. What I meant was is it possible and how do you turn a program into a graphics icon or other representation of the program that you can click on and run that cuts out the use of the compiler.
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Once you have compiled your project you can use your .exe-file by clicking on the icon in explorer or anywhere else. the icon itself can be changed using the resource editor inside of VC or programs like ResHacker.
modified 12-Sep-18 21:01pm.
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I'm sorry, but I really don't understand this. Could you break it down for me? I'm sorry if I am being annoying, I am just incredibly new at this.
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It's not perfectly clear what you're asking, but I'll take a crack at it. You can't run a program without compiling it. When you build a program in Visual Studio you enter text elements that the compiler understands. When you Build your program the IDE first compiles the files in your program, then links them together into a binary file that can be directly executed by the computer. Normally you'll add to the code, change things, and rebuild it within the IDE many times until you're satisfied with the result and call it done. After the last build, whatever it is that you built will exist as an executable file with the same name as your project, and the file extension .exe. This program can be moved, copied, and run just like any other program on your computer - it doesn't go away just because you shut down Visual Studio.
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
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Where would the executable file exist? How would I find it? When I do find it, say I move it to become a desktop icon, would it still work?
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I don't recall where VC4 stores them - I think it's in the Project file, but you can always use the Search function in Windows to locate it. Once you do, make note of it, as that's where VC4 will put future files.
HackerBoy wrote:
say I move it to become a desktop icon, would it still work?
That's a definite yes or no. It depends. Simple console programs often run standalone, others have to be installed in Windows. If the program has no external dependencies (dlls, resource files, etc) it should run fine from anywhere. More complex programs usually have to install other files they depend on to run on the target machine, and if you use any custom dlls in your program, these have to be registered with the operating system.
Spend some time with Mike Dunn's excellent C++ FAQs[^] article and review the many good Beginner articles on this site. I'd also recommend picking up a book or two on Windows programming in general, and programming with VC++ in particular. Most of what you'll find now are books on .Net - skip them. Look for books on VC++6 and earlier, as most of what you're trying to learn will be found there. I find them in cheap discontinued book piles in bookstores; it's nice to find a $80 text for $5 that's current enough for my needs.
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
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Thank you for answerng my questions even though they were juvenile. And especially thanks for the references to learning materials. 
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HackerBoy wrote:
even though they were juvenile
Not at all. We all start from the beginning, and we're all beginners at something. I've been programming for 25 years, yet I'm a beginner at C++ and Windows in general. That's what this site is for, swapping knowledge among us, each with his own unique skillset.
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
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Another possibly useful reference - there are a few (slightly out of date) Visual C++ books that can be downloaded from http://www.xatrix.org/index-fbooks.html . I don't know how good these particular ones are, but most VC++ books have resonable beginner tutorials.
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I have a program that I am compiling in Visual C++ .NET (Ver. 7.0.9466) that generates tons of C4251, C4275 and C4661 warnings. I know why they are being generated and wish to ignore them. I would like to not have them generated at all, because there are so many that it slows my compile down to half speed. There is the C/C++ Advanced option for a project to "Disable Specific Warnings". I thought this would be exactly what I needed, but when I added them into the field "4251;4275;4661", they were still generated. The only I was able to get them to not generate was to also set the "Warning Level" (found under the C/C++ General option) to 1. I would describe this behavior as a bug.
Has anyone else seen this same behavior? Is there a fix or workaround for it? Thanks in advance for any response.
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Is "4251;4275;4661" the right syntax for that setting? Check the help, it might be comma- or space-separated instead.
If that still doesn't work, add a pragma to stdafx.h before your includes:
#pragma warning(disable:4251 4275 4661)
and don't forget to eventually fix the code that's creating the warnings
--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
You cannot stop me with paramecium alone!
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