Re: a basic dll question - C / C++ / MFC Discussion Boards

Nish Nishant11-May-03 7:56

11-May-03 7:56

Matt Newman wrote:
My question is, is this the problem spot

Try putting this code just before :-

_tprintf("%s", chMsg);

That way we know if the wide string is okay.

Nish

"I'm a bit bored at the moment so I'm thinking about writing a new programming language" - Colin Davies

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Re: printf and unicode

Matt Newman11-May-03 8:11

Matt Newman

11-May-03 8:11

I did that but the only way I could get it to compile was to change it to

_tprintf(_T("%s", chMsg);

When i did this I got the same output.

vsprintf(T2A(chMsg), pFormat, pArg);

This is the only code executed on chMsg pFormat is LPCSTR and pArg is va_list

Matt

Re: printf and unicode

C^hris L^osinger11-May-03 11:10

C^hris L^osinger

11-May-03 11:10

try "%S" instead of "%s"

-c

C^hris L^osinger
Smaller Animals Software

Re: printf and unicode

Matt Newman12-May-03 4:27

Matt Newman

12-May-03 4:27

That didn't work either, It did add alot of special characters though Smile | :)

Matt

a basic dll question

transoft11-May-03 6:52

transoft

11-May-03 6:52

Hi,

I developed dll. I tried to regsvr32.exe to load the dll. I had a error message.

"filename.dll was loaded, but the DllRegisterServer entry point was not found"

what is problem of my dll?

Thanks.

Re: a basic dll question

Nish Nishant11-May-03 7:49

Nish Nishant

11-May-03 7:49

regsvr32.exe is used to register COM DLLs and COM DLLs implement an exported function called DllRegisterServer for this purpose. regsvr32.exe simply LoadLibrary's the DLL and calls this function.

Nish

Re: a basic dll question

transoft11-May-03 8:19

transoft

11-May-03 8:19

Hi, Nish

Do you have an example to implement this function? Any ideas are
appreciated.

Thanks

Re: a basic dll question

Matt Newman11-May-03 9:06

Matt Newman

11-May-03 9:06

li0000 wrote:
Do you have an example to implement this function?

First of all is your DLL a COM DLL? If it is just a regular DLL you don't need it. If it is a COM DLL you should probably read up on COM.

Matt

encrypted binary variable

noxon11-May-03 6:03

noxon

11-May-03 6:03

I'm new to this, but I have a problem I can't solve, and could do with some help please.

I'm writing an encrypted chat program with VC++ 6, which uses the Winsock API. The encryption is provided by Peter Gutmann's cryptlib library.

The problem is that the encryption process outputs a void pointer to a binary string variable, and sockets as far as I'm aware take a pointer to a character string. The cryptlib documentation suggests using the S/MIME format but I'm not writing an e-mail client/server, I just want to send the data through a socket, something like this:

send( mySocket, encryptedDataBuffer, 1024, 0 );

Is there a way I can convert the binary into a character sequence, send that and then convert it back at the recieving end?

Thanks in advance.

noxon

Re: encrypted binary variable

Nish Nishant11-May-03 7:44

Nish Nishant

11-May-03 7:44

Hi noxon

The 2nd argument for the send function is a const char* but remember that send was first written during the old C days and then a byte and a char were the same. This does not mean send can send only null terminated text strings. You can definitely use send to send binary text.The 3rd parameter specifies the number of bytes to send.

Regards,
Nish

Re: encrypted binary variable

noxon11-May-03 8:52

noxon

11-May-03 8:52

Thanks Nish,

that has cleared up the question of whether I can do it or not. Im glad it was you who answered, it was your tutorial that got me off the ground with Winsock when I started writing the prog.

According to Microsoft void and char pointers are interchangeable without having to cast the pointer. So I'm giving cryptlib a NULL pointer to a character string like so:

char* encryptedDataBuffer = NULL;<br />
<br />
cryptPushData etc...<br />
<br />
cryptPopData( cryptEnvelope, encryptedDataBuffer, encryptedDataBufferSize, &bytesCopied );

But when i then use the code to send it on the Socket:

send( mySocket, encryptedDataBuffer, 1024, 0 );

The program just falls over (crashes), this same function works with a plaitext character string, so if I can send the binary, do you think I need to convert it to a hexadecimal representation of the actual binary, or am I missing something (quite possible).

Many thanks for help.

noxon

compiling with gcc or g++ in unix

Themis11-May-03 5:21

Themis

11-May-03 5:21

Yes, I know that this is a Visual C++ forum but is there a chance that anyone knows how do I compile a project in unix using gcc or g++ composed in C++ and spread in several .cpp and .h files? To be exact I have nine files the eight of them are pairs .h & .cpp which contains classes and the last one is my main.cpp.

Thanks for any help, Themis

Re: compiling with gcc or g++ in unix

Nick Parker11-May-03 5:32

Nick Parker

11-May-03 5:32

Themis wrote:
using gcc or g++ composed in C++

At the command prompt type (if the compiler locker isn't already added):

add egcs

then type:

g++ -o ExecutableFileName File1.cpp File2.cpp File3.cpp MainFile.cpp

The -o does not create an object file, this is just an option. The header files should be #include'ed within their perspective .cpp files. Hope this helps.

-Nick Parker

Re: compiling with gcc or g++ in unix

Baris Kurtlutepe11-May-03 5:33

Baris Kurtlutepe

11-May-03 5:33

You can use gcc to compile individual object (*.o) files from each .cpp file and then you can again use gcc to link these objects files into an executable. But I think you should better construct a "Makefile" and use the gnu utility "make" with it in order to accomplish this job fairly easier. Search for how-to's in google and I'm sure you'll get the answers.

kuhx198011-May-03 3:09

kuhx1980

11-May-03 3:09

i m chinese, and i jioned here 5 momth. i like C++, but i m pool in english, wish you can touch me.

Re: hi

kuhx198011-May-03 3:10

kuhx1980

11-May-03 3:10

and my msn:
kuhx@msn.com
let us be a friend!

Problem with Thread and Main Window

Atlence11-May-03 1:59

Atlence

11-May-03 1:59

Hi!

I've got a problem when I use the AfxGetMainWnd function to get a pointer of the main window. I've created a thread to complete some operations, and I want to add an item in a list of my main window (a dialog). Visual C++ crashes. But in the primary thread, I can add an item without crashing.

Can anyone help me????

My code:

UINT  MyThread(LPVOID pParam)<br />
{<br />
	CGCDlg* Dlg=(CGCDlg*) AfxGetMainWnd ();<br />
	ASSERT_KINDOF(CGCDlg, Dlg);<br />
	Dlg->m_List.InsertItem (0, "Item");<br />
	return 0;<br />
}<br />

Thks in advance!
Appstmd
http://www.appstmd.com

Re: Problem with Thread and Main Window

User 665811-May-03 2:10

User 6658

11-May-03 2:10

try to pass this as pParam to your thread-func and cast pParam to CGCDlg* instead of AfxGetMainWnd().

regards

modified 12-Sep-18 21:01pm.

Re: Problem with Thread and Main Window

Neville Franks11-May-03 2:26

Neville Franks

11-May-03 2:26

I doubt it is VC++ crashing, but instead it is your app. AfxGetMainWnd()returns the current threads main window, which isn't what you want.

Try:

AfxGetApp()->GetMainWnd();

There are many restrictions on what you can do with CWnd's in a worker thread, as they aren't in the worker thread's message map.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

Re: Problem with Thread and Main Window

Atlence11-May-03 6:30

Atlence

11-May-03 6:30

Thks a lot! My code is now working....

Thks in advance!
Appstmd
http://www.appstmd.com

Re: Problem with Thread and Main Window

Nish Nishant11-May-03 4:24

Nish Nishant

11-May-03 4:24

Hello

While Neville's suggestion is good, the main issue in your case is that you are using a worker thread to access the UI of another thread (a strict NO-NO). Read up on Joseph Newcomer's writings on UI threads or refer MSDN and see how to create a UI thread.

Regards,
Nish

Re: Problem with Thread and Main Window

valikac11-May-03 6:15

valikac

11-May-03 6:15

I highly recommend that you redesign the program such that the worker thread sends a message to main thread for control update.

Kuphryn

Re: Problem with Thread and Main Window

Neville Franks11-May-03 8:45

Neville Franks

11-May-03 8:45

SendMessage() is very dangerous from a worker thread, and can lead to a deadlock. PostMessage() is the safe way to go.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

TextOut problems

franklyflee11-May-03 0:36

franklyflee

11-May-03 0:36

Hi ppl

I created a child windows and I passed the child window handle to a function. And inside that function I used TextOut to print out simply "hallo"
So I simply use
TextOut(hdc, 10, 10, "hallo", 5);
One line is fine, but if I called TextOut like 10 times and incrementing like

TextOut(hdc, 10, 30, "hallo2", 5);<br />
TextOut(hdc, 10, 50, "hallo3", 5);<br />
TextOut(hdc, 10, 70, "hallo4", 5);<br />
.<br />
.<br />
.

Then some of the "hallo"s will be out of the range of the child window and cannot be displayed. So anyone can help me how to make it scrollable?

And another thing is when I resize the child window, like maximizing or minimizing it. The texts will be all gone. So I think that has sth to do with WM_PAINT, right? But how should I make it?

Thanz!! Smile | :)

fRaNkLy i'm FrAnKy

Re: TextOut problems

franklyflee11-May-03 1:04

franklyflee

11-May-03 1:04

Oh actually I'm trying to make the application window like a console window, displaying text

So when the text goes on and on, the most recent text will be inside the window's view while the previous ones are scrolled upwards...um...you know what I mean.. hehe

And yes I'm using C to call the windows API using DEV C++ as compiler running on windows XP

So do any of you guyz have any idea on how to make it? Just displaying text on the application window? Thanz!! Big Grin | :-D

fRaNkLy i'm FrAnKy

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