C / C++ / MFC Discussion Boards

Re: COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

Greg Mort4-Aug-09 4:26

Greg Mort

4-Aug-09 4:26

its a custom made device, it uses the mchpcdc drivers

Re: COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

Randor 4-Aug-09 4:41

Randor

4-Aug-09 4:41

Well Greg,

I would be willing to bet that each time you plug-in the USB device Microsoft Windows is assigning a new COM port.

Best Wishes,
-David Delaune

convert wchar* to byte*

Rakesh54-Aug-09 3:42

Rakesh5

4-Aug-09 3:42

hi,

can anyone suggest me how to convert wchar* to byte*...

Thanks,
Rakesh

Re: convert wchar* to byte*

Randor 4-Aug-09 3:50

Randor

4-Aug-09 3:50

You can simply cast the pointer to PBYTE or BYTE*

wchar_t buf[] = L"Hello World";
PBYTE pBytes = (PBYTE)buf;

Best Wishes,
-David Delaune

Re: convert wchar* to byte*

Rakesh54-Aug-09 4:12

Rakesh5

4-Aug-09 4:12

hey,

its not converting fully...

if i have wchar* q = "AJC";

when i convert it using ur method,

PBYTE pbytes = (PBYTE)q;

its giving pbytes as C alone...

can u shed some light on it?

Thanks,
Rakesh

Re: convert wchar* to byte*

Randor 4-Aug-09 4:24

Randor

4-Aug-09 4:24

Hi Rakesh,

wchar* q = "AJC";

This line of code is not correct. You cannot assign a pointer to an array of character value. It appears to me that you need some basic C/C++ tutorials. I found these on the net:

http://www.cplusplus.com/doc/tutorial/ntcs/[^]
http://www.cplusplus.com/forum/beginner/21/[^]
http://www.cplusplus.com/doc/tutorial/pointers/[^]

I think if you read these tutorials you may understand why your code does not work.

Best Wishes,
-David Delaune

Re: convert wchar* to byte*

«_Superman_»4-Aug-09 18:47

«_Superman_»

4-Aug-09 18:47

wchar_t* q = L"AJC";
This creates a pointer to a wide character string.

To convert this to BYTE* which is a multi-byte character string you can use the WideCharToMultiByte[^] API.
But then a BYTE pointer will not suffice.

You will need a BYTE array declaration. Something like -
BYTE bytes[255];

«_Superman_»
I love work. It gives me something to do between weekends.

Heavy Duty Client/Server Application

Madhu_Rani4-Aug-09 3:30

Madhu_Rani

4-Aug-09 3:30

Well, I developed a very basic client/server application by extracting knowledge from the article.

http://69.10.233.10/KB/IP/serversocket.aspx[^]

The application works fine when client/server exchanges text data (Hello, Hi etc of few bytes). But when server sends the image data (say a bmp of 3 MB). The send function sends data properly but on receiving side, the received bits are just 256. where the rest bits gone?

How can we transfer image data (upto MB) through the client/server application? any idea

Re: Heavy Duty Client/Server Application

Randor 4-Aug-09 3:57

Randor

4-Aug-09 3:57

Madhu_Rani wrote:
How can we transfer image data (upto MB) through the client/server application? any id

The article you referenced supports both TCP and UDP so which protocol did you choose?

Best Wishes,
-David Delaune

Re: Heavy Duty Client/Server Application

Madhu_Rani4-Aug-09 17:57

Madhu_Rani

4-Aug-09 17:57

TCP... but do you think it is protocol dependant?

Re: Heavy Duty Client/Server Application

Randor 4-Aug-09 19:07

Randor

4-Aug-09 19:07

Madhu_Rani wrote:
TCP... but do you think it is protocol dependant?

The reason I asked is because UDP does not guarantee data packet delivery. The first thing that came into my mind when you described packet loss was the UDP protocol. It looks like the author of the project is very active in his article message board so you may want to address him there.

Best Wishes,
-David Delaune

outlook in plain C++

Fuad Abu Sameer4-Aug-09 3:04

Fuad Abu Sameer

4-Aug-09 3:04

i want to make windows 32 console application and use task functionality to send task to outlook contact using plain C++
can any bod help me ?
I am using VS 2008 Professional Edition

Re: outlook in plain C++

David Crow4-Aug-09 5:39

David Crow

4-Aug-09 5:39

Fuad Abu Sameer wrote:
i want to make windows 32 console application and use task functionality to send task to outlook contact using plain C++
can any bod help me ?

See here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Automating application for multiple version of word

gadag4-Aug-09 2:58

gadag

4-Aug-09 2:58

Currenlty my application is working fine for MS Word 2000 to 2007.Now I need to make it compatible for word 97.
Iam using MFC Word Automation to open the document and doing operations inside the ActiveX Controle.
Iam using early binding.i.e using wrapper class
Please help is needed.

assignment operator

p_19604-Aug-09 2:41

p_1960

4-Aug-09 2:41

Hi,
Please let me know from below code ..that whether assignment operator or copy constructor is called in each case and why...

A is a class..

1)A a2;
A a1=a2;
2)a1=a2;
3)a1(a2);

Re: assignment operator

Cedric Moonen4-Aug-09 2:45

Cedric Moonen

4-Aug-09 2:45

1) Copy constructor (for a1)
2) Assignement operator
3) Syntax is wrong, it should be A a1(a2); in which case it is the copy constructor.

Why ? Because it is like that Smile | :)

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: assignment operator

CPallini4-Aug-09 3:00

CPallini

4-Aug-09 3:00

Why don't you try yourself? The debugger, you know, it is a fantastic tool... Roll eyes | :rolleyes:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

memory could not be written

caobo9224-Aug-09 1:33

caobo922

4-Aug-09 1:33

Hello my friends:
Sometimes I start my program , I get an error message saying: The instruction at "0x766fbb8f" referenced memory at "0x2f7a6e2e"(this number vary). The memory could not be "write". It usually have the option to press ok to terminate the program, or cancel to debug.

The error message follow:
First-chance exception in cloud.exe (WININET.DLL): 0xC0000005: Access Violation.

Ordinal103+0x710e
wininet ! InternetTimeFromSystemTimeA
wininet + 0x4b1b
wininet + 0x497c
wininet ! InternetTimeFromSystemTimeA + 0xd085
wininet ! CommitUrlCacheEntryA + 0xd1
wininet ! InternetClearAllPerSiteCookieDecisions
wininet ! Ordinal117+0x7f2
wininet ! InternetTimeFromSystemTimeA + 0x7b39
wininet ! Ordinal101+0x592
wininet ! Ordinal101+0x24b
wininet ! Ordinal101+0x142
wininet ! InternetGetConnectedStateEx + 0x128
wininet ! Ordinal120+0xbf
ntdll ! RtlSetEnvironmentVariable + 0x30a
ntdll ! RtlSetEnvironmentVariable + 0x34b
ntdll ! RtlSetEnvironmentVariable + 0x40d
ntdll ! RtlSetEnvironmentVariable + 0x3e4
Kernel32 ! GetModuleFileNameA + 0x1b4

Because I use cwebbrowser2 in my application. Sometimes IE6 browser also get an same error message above.
I would appreciate any help.

Re: memory could not be written

Adam Roderick J4-Aug-09 1:49

Adam Roderick J

4-Aug-09 1:49

refer

http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windows.inetexplorer.ie6.ieak&tid=4d1d2cc5-47d4-4fe5-a56f-63a7bfb4567b&cat=&lang=&cr=&sloc=&p=1[^]

Величие не Бога может быть недооценена.

Re: memory could not be written

caobo9224-Aug-09 2:49

caobo922

4-Aug-09 2:49

Thanks for your help. But I can't find the right answer.
I quote the words from that link: I know for the more advanced computer folks this must be an easy question to answer.

What is command routing in VC++ ?

rajajay824-Aug-09 0:08

rajajay82

4-Aug-09 0:08

What is command routing in VC++ ?

Ajayraj

Re: What is command routing in VC++ ?

_AnsHUMAN_ 4-Aug-09 1:18

_AnsHUMAN_

4-Aug-09 1:18

you didn't google with Command Routing C++[^] or did you?

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

how to images from a group in MFC

rajapp4-Aug-09 0:08

rajapp

4-Aug-09 0:08

Hi I have a simple problem but dont know how to do it as i am new to it. I have a couple of images of several monuments and locations of Paris and i want to display it whn i give the name or some identification value like gps co-ordiantes of that location. On searching i found hash table can be used.. but i m totally unknown abt it. Is there any simple solution with codes.

Re: how to images from a group in MFC [modified]

Adam Roderick J4-Aug-09 0:17

Adam Roderick J

4-Aug-09 0:17

If you are using VC++ then CMap is better choice- refer MSDN
It is very easy to use and it is almost most similar to has table.
samples can be available in msdn or u can refer the below link

http://www.ucancode.net/Free-VC-Draw-Print-gdi-example-tutorial/MFC-CList-CArray-CMap-VC-Source-Code.htm#_UsingCMap[^]

Величие не Бога может быть недооценена.

modified on Tuesday, August 4, 2009 6:24 AM

Size of Dialog at run time

002comp4-Aug-09 0:05

002comp

4-Aug-09 0:05

Hello Friends
I m creating one dialog based application in win32.I want to know that can we increse the size of dialog at run time means when users usees that application then I want ot increase the size of dialog on some points?

Thanks In advance.

Regards
Yogesh Sikri

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