C / C++ / MFC

Member 842679823-Nov-11 1:13

Member 8426798

23-Nov-11 1:13

If i have the following case,

Struct Mode
{

union
{
unsigned char MSB;
struct
{
unsigned char a:2
unsigned char b:3
unsigned char c:3

}

}

}

How to model the struct "Mode" in the class diagram?

Software_Developer23-Nov-11 3:24

Software_Developer

23-Nov-11 3:24

[ Here ] is a good UML primer.

C++

#include <iostream>
using namespace std;

/****************
*    class      *
*****************/

class c_Mode
{
public:
        union
        {
            unsigned char MSB;
            struct
            {
                unsigned char a:2;
                unsigned char b:3;
                unsigned char c:3;

            };

        };

} ;

/****************
*    struct     *
*****************/

struct s_Mode
{
public:
        union
        {
            unsigned char MSB;
            struct
            {
                unsigned char a:2;
                unsigned char b:3;
                unsigned char c:3;

            };

        };

} ;



int main()
{

    //  class
    c_Mode clsMode;
    clsMode.a=0;
    clsMode.MSB=0;

    //  struct
    s_Mode mode ;
    mode.a=0;
    mode.MSB=0;



    return 0;
}

Member 842679824-Nov-11 7:05

Member 8426798

24-Nov-11 7:05

which model is correct for the above code??

http://s1209.photobucket.com/albums/cc395/phan-tom/[^]

modified 26-Nov-11 3:01am.

Doesn't open heading file VC ++

Member 842679825-Nov-11 21:23

Member 8426798

25-Nov-11 21:23

The Link..
http://s1209.photobucket.com/albums/cc395/phan-tom/[^]

PeLeg8922-Nov-11 23:55

PeLeg89

22-Nov-11 23:55

People Hi!People, prompt why VC ++ doesn't open title files, can where it is necessary to adjust?
It is all to be in one folder, and doesn't want to open. Confused | :confused:

Richard MacCutchan23-Nov-11 0:04

23-Nov-11 0:04

Your question is not very clear, but if you are having trouble accessing files in your project then check that the location property is correct.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

PeLeg8923-Nov-11 0:14

PeLeg89

23-Nov-11 0:14

Ok! in my project there is two file-first main.cpp and main.h,and i am using command #nclude"main.h",But in the с++ editor the error that can't open this file Frown | :(

Both files are in one directory

Richard MacCutchan23-Nov-11 0:30

23-Nov-11 0:30

What do you mean "can't open"? If both files are in the correct directory then the editor will find them. You must have some other problem that is preventing it from locating the file. I presume the word "#nclude" above is a simple typo here only and not in your source file.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Erudite_Eric23-Nov-11 1:24

Erudite_Eric

23-Nov-11 1:24

PeLeg89 wrote:
#nclude

Try #include Smile | :)

==============================

Nothing to say.

Albert Holguin23-Nov-11 2:47

Albert Holguin

23-Nov-11 2:47

If your editor can't find a file, it means either:
0. File doesn't exist.
1. Path is not specified correctly in the include (if using entire path).
2. Path is not part of the project library/include directories (if using <>).
3. I believe I've also seen this occur if the file is not part of the project (although don't quote me on that one, don't quite remember)

PeLeg8923-Nov-11 2:56

PeLeg89

23-Nov-11 2:56

Thank all,you helped me Smile | :)

,I think this is 3 item

How to access physical memory location from IP address

Albert Holguin23-Nov-11 3:32

Albert Holguin

23-Nov-11 3:32

Great

fingerss522-Nov-11 21:11

fingerss5

22-Nov-11 21:11

Can someone assist me how to read/write physical memory location from IP address?

Thanks.

Re: How to access physical memory location from IP address

CPallini22-Nov-11 21:38

CPallini

22-Nov-11 21:38

User code can just access virtual memory (i.e. it doesn't know the physical address is accessing).

fingerss5 wrote:
from IP address

If you mean: "from a remote PC" then you have to write a client-server application for the purpose.
Smile | :)

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]

Re: How to access physical memory location from IP address

Erudite_Eric22-Nov-11 23:50

Erudite_Eric

22-Nov-11 23:50

fingerss5 wrote:
Can someone assist me how to read/write physical memory location from IP
address?

Just what do you mean? An IP address has nothing to do with memory.

If you mean on a remote machine, then say so. And the other posters comments are entirely valid if that is the case.

==============================

Nothing to say.

Re: How to access physical memory location from IP address

Software_Developer23-Nov-11 0:31

Software_Developer

23-Nov-11 0:31

[ This ] talks about Shared memory access permissions on Windows.

Maybe [ this ] article on Memory-mapped files might help but it applies to XP, not Vista/Windows 7.

("Memory-mapped files allow a file on disk to be associated with an address space. Once this mapping is done the data in the file can be accessed as if the file was in memory." )

MSDN has lots on Memory-mapped files, google "Sharing Memory Over Networks" and/or "Memory-mapped files".

Re: How to access physical memory location from IP address

fingerss523-Nov-11 1:45

fingerss5

23-Nov-11 1:45

Thanks

SetDefaultCommConfig does not control / save DTR / RTS parameters - why ?

Vaclav_22-Nov-11 9:49

Vaclav_

22-Nov-11 9:49

I am having hard time trying to understand why SetDefaultCommConfig will not set DTR / RTS parameters to 0. I can set the DCB to DTR = DTR_CONTROL_DISABLE (0) but when I read it back using GetDefaultCommConfig it goes back to 1.
I can control baud rate as expected, no problems here.
So what is so special about DTR or RTS that is cannot be controlled using Set/GetDefaultCommConfig?
Has data flow control involved here? In my system it is set to None.
The MSDN is rather cryptic saying that “some parameters cannot be changed” -using these APIs.

Here is my test code snippet:
COMMCONFIG config;
CString sPort;
int nPort = 2;
sPort.Format(_T("COM%d"), nPort);
DWORD dwSize = sizeof(COMMCONFIG);
if (!GetDefaultCommConfig(sPort, &config, &dwSize))
{
TRACE(_T("Failed in call to GetDefaultCommConfig\n"));

}

config.dcb.fDtrControl = DTR_CONTROL_DISABLE;// DTR_CONTROL_ENABLE;
config.dcb.fRtsControl = RTS_CONTROL_DISABLE;
config.dcb.BaudRate = 123456;
config.dcb.fOutxDsrFlow = false;

All parmaters are correct in watch.

if (!SetDefaultCommConfig(sPort, &config, dwSize))
{
TRACE(_T("Failed in call to GetDefaultCommConfig\n"));

}
if (!GetDefaultCommConfig(sPort, &config, &dwSize))
{
TRACE(_T("Failed in call to GetDefaultCommConfig\n"));

}

As always , thanks for your help.

Re: SetDefaultCommConfig does not control / save DTR / RTS parameters - why ?

CPallini22-Nov-11 21:42

CPallini

22-Nov-11 21:42

Vaclav_Sal wrote:
some parameters cannot be changed

Maybe it is concise, but is clear: you cannot change some parameters with this function (don't ask me the reason).
If you need to control DTR/RTS then use SetCommConfig every time you need it.

Re: SetDefaultCommConfig does not control / save DTR / RTS parameters - why ?

Vaclav_23-Nov-11 3:49

Vaclav_

23-Nov-11 3:49

I was hoping to stop the DTR/RTS, set to 0, before I actually need to control them. I wanted to build a different default configuration. I do use SetCommConfig down the line.

And yes, I hope someone will come up with a reason why they cannot be controled by this API. But it appears to be long shot here.

I think I found a workaround, not using DTR/RTS, but I need to test it.

Thanks for your input.

string operation

robin70022-Nov-11 9:40

robin700

22-Nov-11 9:40

i have a string such that

hello
hi
good
i want to extract the values line by line....please help

Re: string operation

Richard MacCutchan22-Nov-11 9:59

22-Nov-11 9:59

What sort of string, and what do you mean by extract the values line by line? You could use one of the strtok[^] variants for a simple character array, or one of these functions[^] for a string.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: string operation

robin70022-Nov-11 10:13

robin700

22-Nov-11 10:13

i have a character array such thatb char buffer[100];
the values are stored like
cklvcmsdl
dclcm
dcpcc

i have to extract these values line by line and compare them with the input to find matching usernames

buffer contains the usernames

Re: string operation

Richard MacCutchan22-Nov-11 10:22