C / C++ / MFC

Re: LoadLibrary("FilePath.dll") Failed - The specified procedure could not ne found

6-Dec-04 3:24

What about:

LoadLibrary(L"x:\\xyz\\FileName.dll");

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

missdeborah26-Jan-12 12:15

missdeborah

26-Jan-12 12:15

I ran Depends.exe to check version of my dependencies. It works..

Unmanaged DLL - Reading an XML File

DavidWGriffin6-Dec-04 2:46

DavidWGriffin

6-Dec-04 2:46

I'm working on a .NET C# application which calls an unmanaged DLL (written in C/C++) which interfaces with a 1553 network to read and send data to a 1553 bus controller. This means that my application is hard to test on my regular desktop since it doesn't have the needed network hardware to actually send or receive data. Furthermore even if it had the hardware, setting up a test with the appropriate network traffic is very difficult (though we do have specialized lab facilities that can do it -- heavily scheduled facilities). My objective is to run complex, challenging, realistic tests of my application on my desktop.

My thought was to create an unmanaged DLL in .NET which could "pretend" to be the network DLL and feed data to my application in the same way the real DLL would. This sounds good in principle but I haven't quite managed it yet. With some help from the internet newsgroup, I managed to create a VC++ unmanaged DLL which when created looks like the network DLL to my application. David Browne on microsoft.public.dotnet.languages.csharp provided the following instructions for me:

Visual Studio > New Project > Visual C++ Projects > Win32 Projects > Win32
Project
Brings up the "Win32 Application Wizard"
Change Application Settings > Application Type
Choose ApplicationType: DLL and Additional Options: Export Symbols

That will create a skeleton of an unmanaged DLL. In the [appname].h file
are the exports for the application, with examples of exporting a class,
variable and a function.

This actually worked great. Now however, what I'm trying to do is to do something useful within that C++ unmanaged library.

There are no doubt many approaches that could be used for this. One might be to have the unmanaged DLL read a file that contains a "scenario" of network messages. Unfortunately, the usual XML processing classes don't seem to be available, probably because they are "managed" and available only through the CLR. The question is what to do about that? I get the hint from reading some of these postings that I might be able to eventually overcome that limitation by creating some C# app doing what I need and calling it from the C++ but that seems complicated. Is there a better way to read this scenario file? Am I better off just reading it as text and doing my own parsing? I'm pretty new to the sophisticated parts of .NET so I thought I'd ask for some advice. Thanks.

David W. Griffin
Lockheed Martin Aeronautics Company

Re: Unmanaged DLL - Reading an XML File

Steve S6-Dec-04 6:00

Steve S

6-Dec-04 6:00

The unmanaged DLL could use MSXML to read the XML, either using DOM or SAX as appropriate, or use something like tinyXML instead...

Steve S
Developer for hire

Re: Unmanaged DLL - Reading an XML File

Anonymous7-Dec-04 9:35

Anonymous

7-Dec-04 9:35

Thanks, but I guess I'm more ignorant than I thought. Could you give me a one line definition of MSXML, DOM, and SAX and give me perhaps a pointer to where I might find an example to use to try these methods? And perhaps some guidance as to what the advantages to each approach are so I can determine which to try first?

Re: Unmanaged DLL - Reading an XML File

DavidWGriffin7-Dec-04 9:36

DavidWGriffin

7-Dec-04 9:36

shortkeys

V.6-Dec-04 2:22

6-Dec-04 2:22

Is there a good article or can anyone explain shortkeys?

I have implemented an accelerator resource in our dll. I added an event handler in a class and thought (wrong Frown | :(

that if the dialog, which the class implements, would handle the shortcutkey event, but nope.

The dialog has an OK button which is disabled until a choice (of 2 radiobuttons) is made. The shortcut keys would be a "faster" way of doing this...

So what am I doing wrong? (I also tried onkeydown and stuff...)

tnx for your help!

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

David Crow6-Dec-04 2:35

6-Dec-04 2:35

Just for clarification, are you referring to mnemonics?

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

V.6-Dec-04 2:41

6-Dec-04 2:41

You mean the & in menu's and controls? Nope, I mean an extra resource ACCELERATOR which maps shortcut keys to events like CTRL+K, CTRL+D,...

I already tried the mnemonics, but it didn't work. (Too be honest, I think there's something wrong with the dialog, there are several mnemonics defined, but only 1 seels to work.)

(I have no idea who created that dialog btw Poke tongue | ;-P

)

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

BlackDice6-Dec-04 2:47

BlackDice

6-Dec-04 2:47

I'm not sure if it's what you want, but I recently saw a similar article by Nish on www.voidnish.com. This is a program to make global shortcut keys, if that's what you want - so you could look at that source code. If you just want the keys to work for your application, override the PreTranslateMessage() function in your dialog and use GetAsyncKeyState() to check for the keys you need to watch for.

My articles

www.stillwaterexpress.com

BlackDice

V.6-Dec-04 3:28

6-Dec-04 3:28

I did it thanks.

(i put together all info from CP and MSDN and finally it worked Smile | :)

)

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Program wont write to file

V.6-Dec-04 3:29

6-Dec-04 3:29

I did it via PreTranslatMessage...

(the code I found on MSDN didn't seem to work for me, but now it works jeej Smile | :)

)

tnx!

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Custom control in VC++

johnny__XP6-Dec-04 2:17

johnny__XP

6-Dec-04 2:17

Easy question i think. I want to implement a custom control that contains an image, two radio buttons, and a combo box. I have two ways in my mind (or maybe 3 if i consider the ActiveX case...):
1) Use the resource editor and create a borderless dialog with these controls and then attach multiple instances in a dialog box using create method
or
2) Create a new class extending, say CWnd that dynamically adds these controls.
What is correct way (in the sence: what the "professionals" do)?
I have implement the first way successfully but i don't know if is the right technique...
Thanks.

CNewbie6-Dec-04 0:43

CNewbie

6-Dec-04 0:43

/* Ok Here is the jist of what this program is supposed to do:
This program checks "database.txt" for the text "New String"
which is in the string name "string". If found it will say so.
If it goes through the entire file without finding the text,
it is then supposed to say it has found a new string and then
append the text "New String" to the end of the file. This code
is error free. Only problem is that it doesnt write the text to
the file, anywhere. If someone can tell me why I'd love to know,
because I cannot figure out why. Thanks */

#include <fstream>
#include <iostream>
#include <string>
using namespace std;

int checkdatabase(int x, std::string current, std::string string)
{
fstream stream("database.txt", ios::in | ios::out | ios::app);
if (!stream)
{
cout << "Cannot Open database" << endl;
return 2;
}
while (std::getline(stream, string))
{
x++;
if (current == string)
{
std::cout << "string #" << x << " Found: " << string << std::endl;
stream.close();
return 0;
}
}
x++; std::cout << "***New String Found*** " << "#" << x << ": " << current << std::endl;
stream << "String" << endl;
stream.close();
return 0;
}

int main()
{
std::string current = "New String";
std::string string;
int x = 0;
checkdatabase(x,current,string);
return 0;
}

Re: Program wont write to file

Sujan Christo6-Dec-04 1:54

Sujan Christo

6-Dec-04 1:54

Hi,
I took tried ur code. Seems that fstream is havin some prob. I tried with a different stream for writing after closing the current stream and it worked !. ie added the following code after stream.close();
fstream stream2("database.txt", ios::in | ios::out|ios::app );
stream2 << current << endl;
stream2.close();

This means that the first stream is having some problem
Sujan

Re: Program wont write to file

CNewbie6-Dec-04 7:42

CNewbie

6-Dec-04 7:42

Thank you sujan, that did work. Smile | :)

That makes me wonder why the first stream didnt work? If it did get corrupted like you said.

Funny thing, before I posted this I did try where I closed the original stream and then reopened it again and it still didnt work.

Go figure!

Re: Program wont write to file

David Crow6-Dec-04 2:30

line numbers in an editor application

6-Dec-04 2:30

Based on Sujan's comment, could it be that getline() is positioning the file pointer past the end of the file such that the append operation fails?

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

SVPG6-Dec-04 0:40

SVPG

6-Dec-04 0:40

I have an application developed using CRichEditCtrl, how can line numbers be added into such an application.
The cursor should not actually come to the part where the line numbers are displayed.

transmitfile

yingkou6-Dec-04 0:06

yingkou

6-Dec-04 0:06

I want to know how to use API:TransmitFile to transfer a file from sever to client.please give me a example or some codes,thanks a lot

David Crow6-Dec-04 2:33

6-Dec-04 2:33

Have you seen the Pinball and Pop3 examples on MSDN?

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

yingkou6-Dec-04 12:35

yingkou

6-Dec-04 12:35

thanks for your answer,I haven't seen those exmaples,could you give me a URL?

David Crow7-Dec-04 2:21

7-Dec-04 2:21

http://msdn.microsoft.com/library/en-us/vcsample98/html/vcsmppinballinternetserverextensionthatprovidesgraphicsredirection.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/html/vcsmppop3sample.asp

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