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help for server...

dubrava23-Aug-05 2:15

23-Aug-05 2:15

I have to make a server which should be able to make about 1000 connections after booting. Then starts communication proccess in which clients sends short messages(about 10 bytes) to server and server responds whith similar messages to 5 clients after receiving every message from one of the clients. In every moment about 300 clients are sending messages to server. Server also must reconnect broken TCP connections on client request. Can anybody help me about a way to make that kind of application and which tool is better for use:WinSock API or MFC classes CSocket or CAsyncSocket, then blocking or non-blocking sockets etc. Help!!!

Re: help for server...

Jack Puppy23-Aug-05 3:03

23-Aug-05 3:03

Which I/O Strategy Should I Use?

He is smart. He will make our Windows go.

Re: help for server...

Anonymous23-Aug-05 10:09

23-Aug-05 10:09

Clients use GPRC modems for communication and it should be able to communicate with server and it doesn`t metter which I/O strategy is used.

Re: help for server...

Moak24-Aug-05 3:47

24-Aug-05 3:47

Sounds like a major networking project to me, you should probably ask a more specific progamming questions.

How can I change WebBrowser control to XP style?

SAsura23-Aug-05 2:13

23-Aug-05 2:13

hi,
I change my program to XP style by using a manifest file. But I found that it does not work with the WebBrowser ActiveX control in a dialog. The WebBrowser ActiveX control is still 2000 style.
How to make it use XP style?

Bin, Du

Automating Excel

DKT__23-Aug-05 1:43

DKT__

23-Aug-05 1:43

Hi,

I am googling for about 5 hours now, to find a good tutorial about automating excel.

What I need:

I want to load data from a database into excel, make a chart out of it, and safe it as a html file.

I found some articles concerning this at the msdn. But none helps me out, cause its ALWAYS MFC. And I want to code in straight c++. Next problem is, it always needs special header files like excel.cpp and excel.h, which dont exist anywhere...

Is there any article about excel automation for normal c++ out there?

Word Automation was no problem, but it seems to be different from excel!

DKT

Re: Automating Excel

David Crow23-Aug-05 3:10

23-Aug-05 3:10

Have you seen MSDN article Q178749? The MFC-specific parts of that article have nothing to do with the communication with Excel.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous23-Aug-05 3:52

23-Aug-05 3:52

Ive seen it, yeah.

Ok, take this link for example:

http://support.microsoft.com/default.aspx?scid=kb;en-us;199691&Product=xlw2K[^]

I did all steps just like the MSDN tells me.

But I get thousands of errors.

First one:

_Application oApp; _Application isnt known.

I imported excel.exe, as I was told, I included the CApplication from the type library, which gives me more and more errors...

I dont understand that. I went the way MSDN told me, and it doesnt work at all.

This topic is hard, therefor I wanted to have an example code to learn from it. But this seems to be impossible, even for MSDN.

DKT

Re: Automating Excel

David Crow23-Aug-05 4:03

23-Aug-05 4:03

After importing from the type library, did ClassWizard add a .h and a .cpp file to your project? If so, do they contain a _Application class? Did you #include the .h file correctly?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous23-Aug-05 4:31

23-Aug-05 4:31

Yes, I get the h files after importing the library!

The problem is the next step:

Add the include statement for excel8.h after the include statement for stdafx.h at the top of the AutoProjectDlg.cpp program file:

#include "stdafx.h"
#include "excel8.h" // excel.h in the case of Excel 2002 and Excel 2003.

Theres NO excel.h (I am using 2002)

DKT

Re: Automating Excel

David Crow23-Aug-05 4:53

23-Aug-05 4:53

Anonymous wrote:
Yes, I get the h files after importing the library!

Theres NO excel.h (I am using 2002)

These two statements contradict each other. If a .h file was created, just #include it, no matter what name it has.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous23-Aug-05 21:08

23-Aug-05 21:08

What do you mean?

I got the specified h files like CApplication.h and stuff...
and yes, I included them, but as I said, get thousands more errors in those h files.

DKT

Re: Automating Excel

David Crow24-Aug-05 2:51

24-Aug-05 2:51

Are you saying that ClassWizard created more than one .h and .cpp file? If so, I've not seen that happen before.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous24-Aug-05 3:07

24-Aug-05 3:07

Hmm... I found a thing that might help me:

http://www.lordjoe.com/Java2Com/CPPCode.html[^]

But I have the problem with the following line:

hr = Invoke(pdispApplication, DISPATCH_METHOD, &vRet, NULL, NULL,
OLESTR("WorkBooks"), NULL);

if (FAILED(hr))
goto error;

I get: "Member not found".
This means WorkBooks is ok, but something is missing, had the same before for another method.

My question: I am searching for a reference to find the detailed properties for those methods. How to find out, how to invoke those methods correctly?

Damn, C++ and OLE is quiete hard...

DKT

Re: Automating Excel

David Crow24-Aug-05 3:19

24-Aug-05 3:19

Anonymous wrote:
How to find out, how to invoke those methods correctly?

See MSDN article Q222101.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous24-Aug-05 23:01

24-Aug-05 23:01

Ok, I could solve my problems till now. Thanks for that David!

But I still dont see what methods I can use and which not.

For example: I record a macro which runs another macro.

I see the vb code:

Application.Run

So, If I try to use Invoke with Run as OLESTR, it says "unknown". But other things like add or range work.

What is the methods name for run? Isnt there any paper for all possible methods for non-MFC based c++ OLE code?

MSDN says itself:

C/C++ Automation is much more difficult, but sometimes necessary to avoid overhead with MFC, or problems with #import. Basically, you work with such APIs as CoCreateInstance(), and COM interfaces such as IDispatch and IUnknown.

Yeah, it is difficult, but is it impossible?

Anyway, thanks alot for your help till now David, it helped alot.

DKT

Re: Automating Excel

David Crow25-Aug-05 4:31

25-Aug-05 4:31

I have an Excel file with a macro named DisplayMsg. To open that file and run that macro, I used:

_Application    app;
Workbooks       books;
_Workbook       book;
COleVariant     vtOptional((long) DISP_E_PARAMNOTFOUND, VT_ERROR),
                vtTrue((short) TRUE),
                vtFalse((short) FALSE);
 
if (app.CreateDispatch("Excel.Application") == TRUE)
{
    books = app.GetWorkbooks();
    book = books.Open("C:\\Book2.xls",
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional,
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional);
 
    app.Run(COleVariant("DisplayMsg"),
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional,
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional,
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional,
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional,
        vtOptional, vtOptional, vtOptional, vtOptional, vtOptional, vtOptional);            
}

Does that help any?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous25-Aug-05 4:37

25-Aug-05 4:37

No, sorry!

I am using the help files from Microsoft: INVHelp.cpp and INVHelp.h
Those work quiete well. It uses easier ways to use the invoke function.

Here, everything is getting invoked. Like:

V_VT(&v) = VT_I2;
V_I2(&v) = 20;

hr = Invoke(pdispRange, DISPATCH_PROPERTYPUT, NULL, NULL, NULL,
OLESTR("Value"), TEXT("v"), v);

The problem for me is now: I cant use Run or VBProject.

hr = Invoke(pdispWorksheet, DISPATCH_PROPERTYGET, &vRet, NULL, NULL,
OLESTR("VBProject"), NULL);

It gives me "exception error" in hr.

I just cant get it working. Normally this VBProject doesnt need more than the return value, right?

If Id just get this to work...

DKT

Re: Automating Excel

Anonymous25-Aug-05 4:55

25-Aug-05 4:55

Ok, here my code excerpts:

hr = CreateObject(OLESTR("Excel.Application"), &pdispApplication);

V_VT(&v) = VT_BOOL;
V_BOOL(&v) = TRUE;

hr = Invoke(pdispApplication, DISPATCH_PROPERTYPUT, NULL, NULL, NULL,
OLESTR("Visible"), TEXT("v"), v);

hr = Invoke(pdispApplication, DISPATCH_PROPERTYGET, &vRet, NULL, NULL,
OLESTR("WorkBooks"), NULL);

pdispWorkbooks = V_DISPATCH(&vRet);

V_VT(&v) = VT_I2;
V_I2(&v) = xlWorkSheet;

hr = Invoke (pdispWorkbooks, DISPATCH_METHOD, &vRet, NULL, NULL,
OLESTR("Add"), TEXT("v"), v);

hr = Invoke(pdispApplication, DISPATCH_PROPERTYGET, &vRet, NULL, NULL,
OLESTR("ActiveWorkBook"), NULL);

pdispWorksheet = V_DISPATCH(&vRet);

hr = Invoke(pdispWorksheet, DISPATCH_PROPERTYGET, &vRet, NULL, NULL,
OLESTR("VBProject"), NULL);

Everything works fine till the last invoke. Excel gets started, and a new workbook opened. ActiveWorkBook also works, but not the last invoke. I even cant call ThisWorkbook, same result: exception error...

DKT

Re: Automating Excel

David Crow25-Aug-05 4:58

25-Aug-05 4:58

Anonymous wrote:
hr = Invoke(pdispWorksheet, DISPATCH_PROPERTYGET, &vRet, NULL, NULL,
OLESTR("VBProject"), NULL);

Are the first and sixth arguments correct?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Automating Excel

Anonymous25-Aug-05 20:35

25-Aug-05 20:35

I think so.

As I saw in the VBA "code", it is called like that:

ActiveWorkbook.VBProject.VBComponents.Import

What I did: I call "ActiveWorkbook" to get the active workbook. This gets stored in the pdispWorksheet, and is used for "VBProject". (I know this pdispWorksheet is confusing, but its just for testing).
I also tried to take the pdisp of my newly added Workbook directly, but it gets me the same result.

If I use pdispApplication or something like this, it shows me: Unknown method. If I change DISPATCH_PROPERTYGET to something else, I get: wrong member.
So, I thought it should be ok, how I am calling the method. But I dont see any logic why I get exceptions all the time. Theres not much more in this Invoke...

DKT

Re: Automating Excel

Anonymous25-Aug-05 22:08

25-Aug-05 22:08

What I just found out:

I also got exceptions when Invoking "Run" to run a given macro.
I just found out that it happens cause the macro didnt exist in the sheet.
I put a breakpoint before the run, and created a little macro with the correct name. Then I traced over the run, and wow, it works...

What does that mean for the VBProject? I mean, it doesnt take any parameters, does it?
It just holds a retVal which is from type VARIANT.

DKT

dave2k23-Aug-05 1:06

23-Aug-05 1:06

how can i get a BYTE* from a bmp file?

thankyou

toxcct23-Aug-05 1:09

23-Aug-05 1:09

REPOST !!! Mad | :mad:

Mad | :mad:

Mad | :mad:

Mad | :mad:

Mad | :mad:

you didn't even way 1 hour !! Suspicious | :suss:

Suspicious | :suss:

TOXCCT >>> GEII power
[toxcct][VisualCalc] Suspicious | :suss:

Suspicious | :suss:

ThatsAlok23-Aug-05 1:54

23-Aug-05 1:54

dave2k wrote:
how can i get a BYTE* from a bmp file?

check out this api :- [CBitmap::GetBitmapBits]

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

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