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Hi!
I am going to create a shared dll n(C++, VS .NET 2003 or VS 2008) that acts as an intermediate data source. The dll will be loaded by one application (not mine) that extracts data from the dll.
My application (C++ VS .NET 2003) is on separate PC. I want to load the shared dll and then send data to the dll.
Can I use LoadLibrary()? What commands do I use to do this over tcp/ip?
Thank you, Pia
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Your question isn't too clear. Yes, you can use LoadLibrary to load a DLL and yes, you can use TCP/IP to send data between two computers. But it isn't clear what the connection between these two is in your context.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<
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More details:
I own an application running on one computer. There I can add code to access the remote dll methods. I will write the remote dll.
I do not own the other application that will access my dll locally.
The functions in the dll and my application will be simple. I will send data repetitively to the dll using a function call.
Are more details needed and what details?
The two computers will be in the same room or close, probably in the same local network. I had an idea to mount the remote folder on my PC but it does not seem possible.
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Why do you need to load the DLL in your local application? The remote application loads your DLL, your DLL then listens on some (TCP) port and you can connect to it from your local application and send data as needed. Wouldn't this work?
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<
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Is this a simpler way? Do you have a code example?
I need to inform the dll that I have started sending data so that the dll can change state from Unknown to Running. However the dll can have logic enough to know that if data arrives then the sending has started  .
I may have to send 3-4 parameters of data simultaneously.
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I don't see the need to load the very same DLL into both applications based on what you said, so i'd say, yeah, it's probably simpler. Not sure what kind of example you mean, there are loads of tutorials and examples around the web for creating DLLs and communicating over the network, just google for things like Windows Sockets[^] and Writing DLLs[^]. What else would you need?
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<
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You cannot use LoadLibrary to load a remote DLL.
You must call LoadLibrary on the local machine wherein the DLL is.
For instance, COM allows you to call methods of remote components hosted in DLLs because it creates a stub process in the machine wherein the DLLs are.
Veni, vidi, vici.
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So I accept I have to use DCOM instead of the "simple" LoadLibrary 
Can you please point me to a code example/tutorial on how I call methods in my remote DLL (not .exe)using DCOM?
Alternatively add a code example?
More details:
I own an application running on one computer. There I can add code to access the dll methods. I will also write the dll.
I do not own the other application that will access my dll locally using LoadLibrary.
The functions will be simple. I will send data repetitively to the dll.
Thank you!
Pia
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Actually you don't need DCOM (you may use it if you like), you may use RPCs or implement you own TCP mechanism to communicate with the remote executable that loads the DLL.
CodeProject has some articles[^] about DCOM.
Veni, vidi, vici.
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Which way is the simplest/easiest to learn and create?
Do you have a code example of which function calls I have to make?
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I don't know, after all it depends on your requirements. You could read some articles here at CodeProject (either on DCOM or RPC or TCP client/server programming) and then choose the technique that better fits your need.
Veni, vidi, vici.
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I think you should have searched CodeProject at least now.
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You have two computers A and B.
Executables run on A.
Executables run on B.
You cannot make anything run on B 'magically'.
When two computer 'talk' then both computers must be running something.
Now you can do the following.
1. Write a server, call it T. The server, code you wrote, loads a dll when a command is 'sent' to T. Not that the server must follow all of the restrictions for loading a dll into an application.
2. Write a client, call it M. That client sends the command to T.
Given the above then:
A must run M (client)
B must run T (server)
AFTER that, then B can, vian the client T, cause A to load a dll.
Restating it again, there is NO way to 'magically' make a dll load onto another computer. There MUST be a server of some sort running on the remote computer.
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Hi every one
I have simple code and think and ask other for 2 weeks . And now i have found out how to fix it yet . When I click button for first dialog , it is ok to show another dialog . But when I click button in that dialog in order to show message or do anything else , no thing happens . I follow basic way to add event . First resource and then add class , at last add event handler . But many times ,it does not work ! .
http://www.mediafire.com/?8pppqsnbglzrvb2[^]
Thank you
hi world
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Perhaps I need to approach this in a different way.
This program has exactly the same error, and with a variable named just like last time 'hienthi'
This function has the problem. How was it created? Was it automatic, or did you add the code by hand?
void ChandlerDlg::OnBnClickedButton1()
{
CDialog hienthi(IDD_DIALOG1);
hienthi.DoModal() ;
}
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It is correct and I add by writing directly .
It is alright because when you click into button in first dialog , it show this dialog hien thi . So error is not in this code .
Thank you
hi world
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Okay sure, you added the code by hand.
What makes you think that it is correct?
You don't want an object of type CDialog that has the appearance of your IDD_ABOUTBOX - You want an object of type CAboutDlg.
Just because the dialog looks like your about box, doesn't mean that it has the message_map connected to it or any other event handlers for that matter.
In fact, the only reason that the OK button works is because it already has the ID of IDOK - an ID that is handled by windows and causes the dialog to be closed.
I'll repeat again - your code IS incorrect!
You need to create an object of type CAboutDlg, then call DoModal on it. simple!
Consider the following:
Your dialog is of class CAboutDlg. This inherits from CDialog.
You can't expect to create a CDialog and have it behave like a CAboutDlg, since CDialog knows nothing of the internals of CAboutDlg.
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Thank you ,
Have nice day ! .
hi world
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Ah
I have found out problem . I must use Dialog1 . You are right . Thank you
hi world
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Hi.
I created a short video that shows every step from when the File->New->Project menu option is selected until the app is (successfully) run.
It's 5 mins, 3MB and can be found here[^]
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Thank you a lot
So the error is I forgot the class attached to Resource ID . I must call that class . This make me confused ! . And it is very basic .
By the way , it got out experience from this , try avoid using directly the IDD because it can appear but only for fashion only .
Thank a lot , Nice day ! .
hi world
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Cheers 
Top of the day to you too!
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It seems that the following format "%f\n" for reading a double not working. Please help:
fscanf( f_ptr_seed_inf,"%f\n",&sam_interval);
Thanks
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