C / C++ / MFC Discussion Boards

Anonymous12-Jul-04 7:00

12-Jul-04 7:00

Hai,
I'm using win32 vc++. I'm drawing the background for my button by subclassing.
But at no. of times I'm enabling and disabling the button in my dialog procedure(not in subclass proc). At those times how can I display the text in button as grey ie. how can I retrieve the text from the button and grey it?
Thanks a lot.

Re: win32 drawing

Navin12-Jul-04 10:57

Navin

12-Jul-04 10:57

Does GetWindowText work??

"Fish and guests stink in three days." - Benjamin Franlkin

Re: win32 drawing

md666612-Jul-04 11:14

md6666

12-Jul-04 11:14

hai,
GetWindowText did'nt work. It's getting the caption of the button which there is none cause i'm displaying the text of the button using DrawText() inside the subclass procedure.
anyway thanks.

Re: win32 drawing

Bob Stanneveld12-Jul-04 13:19

Bob Stanneveld

12-Jul-04 13:19

In that case, you should store a copy of the text displayed in a member variable inside the subclass. Then override the GetWindowText function (or define an other) that gives you acces to the caption of the button.

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

integrating C++ and VC++???

naveen_vi12-Jul-04 6:25

naveen_vi

12-Jul-04 6:25

Hi,

I have a device driver for a USB device written in VC++.There is a function in it to Read /write data to the USB port.Now I want to write a a function in C++ so that users can write programs in C++ rather in VC++.

Since c++ doesnt recognise data types like DWORD,BUFFER etc..I am struck.

Is there anyway i can link C++ and VC++.Can i use pointers.
thanks

nev.

Re: integrating C++ and VC++???

palbano12-Jul-04 7:02

palbano

12-Jul-04 7:02

naveen_vi wrote:
Since c++ doesnt recognise data types like DWORD

From WinDef.h

typedef unsigned long DWORD;

naveen_vi wrote:
Is there anyway i can link C++ and VC++.Can i use pointers.

WTF | :WTF:

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: integrating C++ and VC++???

naveen_vi12-Jul-04 7:33

naveen_vi

12-Jul-04 7:33

Hi,

Thanks for ur reply.

So is it enough to include windef.h in my C++ program and write my own header file.
so with typdef can i convert all windows data and use them in my C++ file.

nev

Re: integrating C++ and VC++???

palbano12-Jul-04 7:38

palbano

12-Jul-04 7:38

nev, i don't want to insult you but this is all beginner C++ issues. You should probably take the time to study these basic language concepts so that you understand them before you attempt to implement your project.

But, that's just my opinion... I could be wrong.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: integrating C++ and VC++???

Michael Dunn12-Jul-04 9:14

Michael Dunn

12-Jul-04 9:14

naveen_vi wrote:
so that users can write programs in C++ rather in VC++.

Not sure I understand what you're asking. Visual C++ is the IDE, C++ is the language. You don't need VC to write C++.

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
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----

Re: integrating C++ and VC++???

Anonymous12-Jul-04 10:05

Anonymous

12-Jul-04 10:05

hi mike,

I have a USB chip.They have given me the device driver and thier function looks like this.
http://www.ftdichip.com/knowledgebase/d2xx/manual/userguide.htm

write function is:
FT_STATUS FT_Write ( FT_HANDLE ftHandle, LPVOID lpBuffer, DWORD dwBytesToWrite, LPDWORD lpdwBytesWritten ) .They actually imported functions from win32 api(kernell32.dll).

where FT_status is ULONG data type.
http://www.ftdichip.com/knowledgebase/d2xx/manual/userguide.htm

If i just want to write a C++ program to write my data into LPVOID lpbuffer.How do i di it.I want my function to look like

write(int addr,unsigned char data);

nev

One Question Mr. MIke

ThatsAlok12-Jul-04 20:40

ThatsAlok

12-Jul-04 20:40

Helloo sir,with all due respect,
could you give me useful pointer over smartcard api's
thanks

-----------------------------
"I Think It will Work"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: One Question Mr. MIke

Michael P Butler13-Jul-04 1:06

Michael P Butler

13-Jul-04 1:06

Alok the programmer wrote:
could you give me useful pointer over smartcard api's

What kind of API. Are you talking about a smart card reader or the API of the card itself. The API's usually depend on the hardware being used to read the cards. Google is your best friend in these matters unless you know the manufacturer of your hardware/card.

Michael

CP Blog [^]

Re: integrating C++ and VC++???

Michael P Butler13-Jul-04 1:03

Michael P Butler

13-Jul-04 1:03

naveen_vi wrote:
Since c++ doesnt recognise data types like DWORD,BUFFER etc..I am struck.

DWORD, BUFFER etc are all Windows types. If you are writing a Windows application then these will be available in any C++ compiler. Most of these are defined in WINDEFS.H and map to standard C++ types.

Your question is a little vague. More information would allow us to help you better.

Michael

CP Blog [^]

Problem with find in string

Azghar Hussain12-Jul-04 5:14

Azghar Hussain

12-Jul-04 5:14

Hi Everybody,
I would like to know how to find a substring in a string. finding should be done without case sensitive.
for example consider a string HomeWork.
I want to search wheather worK is there in the above string.
Let me know any function that perform this type of searching.
I tried strstr(), but it did not work because it is case sensitive.

Thanks in Advance.

Re: Problem with find in string

palbano12-Jul-04 5:48

palbano

12-Jul-04 5:48

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt__stricmp.2c_._wcsicmp.2c_._mbsicmp.asp[^]

Software development will be exponentially easier if you learn to use documentation.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Problem with find in string

David Crow12-Jul-04 5:55

David Crow

12-Jul-04 5:55

DELIVER THE PROMISE wrote:
I tried strstr(), but it did not work because it is case sensitive.

So convert both to the same case and go from there.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Problem with find in string

Navin12-Jul-04 9:34

Navin

12-Jul-04 9:34

As DavidCrow said - probably the easiest way would be to make all strings the same case, and then compare. E.g., use strupr on the string and the substring, then do an strstr.

The other option is to write the search yourself. That actually would not be that hard to do, and perhaps that is the purpose of your homework anyway. Wink | ;)

"Fish and guests stink in three days." - Benjamin Franlkin

Re: Problem with find in string

Anonymous12-Jul-04 19:47

Anonymous

12-Jul-04 19:47

Thanks for helping me out. I have converted both strings into lower and searched.

Thanks a lot
Wink | ;)

;););););););););)

Write to Serial Comms port limited to 0x7f

LittleYellowBird12-Jul-04 4:57

LittleYellowBird

12-Jul-04 4:57

I am writting to the Serial Port using m_port.Write(sBuf, 7);.
This writes 7 bytes stored in the array sBuf, which is an array of chars.

However, it only works for numbers upto 0x7f (127), anything more than that loses the upper bit. Any ideas for a fix?

Ali

Re: Write to Serial Comms port limited to 0x7f

jmkhael12-Jul-04 5:12

jmkhael

12-Jul-04 5:12

What is the type of m_port?

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Write to Serial Comms port limited to 0x7f

LittleYellowBird12-Jul-04 5:18

LittleYellowBird

12-Jul-04 5:18

Sorry, I realised as soon as I submitted it that I hadn't put enough info, but couldn't find 'Edit'.

'm_port' is a class which handles the serial comms.
This is the code for the function 'Write'

DWORD CSerialPort::Write(const void* lpBuf, DWORD dwCount)<br />
{<br />
  ASSERT(IsOpen());<br />
  ASSERT(!m_bOverlapped);<br />
<br />
  DWORD dwBytesWritten = 0;<br />
  int nResult = WriteFile(m_hComm, lpBuf, dwCount, &dwBytesWritten, NULL);<br />
  if (!nResult)<br />
  {<br />
    TRACE(_T("Failed in call to WriteFile\n"));<br />
    AfxThrowSerialException();<br />
  }<br />
<br />
  return dwBytesWritten;<br />
}

So it actually uses 'WriteFile' to write the data to the serial port.

Ali

Re: Write to Serial Comms port limited to 0x7f

palbano12-Jul-04 5:43

palbano

12-Jul-04 5:43

Alison Pentland wrote:
anything more than that loses the upper bit

This may be a stupid question but… how do you know that? If you mean the application reading the data is missing the upper bit how do you know it is not the reading that is the problem?

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Write to Serial Comms port limited to 0x7f

LittleYellowBird12-Jul-04 21:12

LittleYellowBird

12-Jul-04 21:12

It is not a stupid question, here is the answer.......

I have an analyser attached to the the serial port, it displays all the data from the Rx & Tx lines on the RS232 port. My code 'talks' to an instrument that we design and I write the firmware for.

The problem is that when I write 0x96 to the port I get 0x16 out. I have traced through the code and I can see the data in the array is correct when I pass it to the 'WriteFile' function.

I can't understand it as it is the same code I have been using for months! Any ideas gratefully received.

Thanks,

Ali

Re: Write to Serial Comms port limited to 0x7f

LittleYellowBird12-Jul-04 21:38

LittleYellowBird

12-Jul-04 21:38

Big Big Smile!

Thank you, your question has prompted me to find my problem. I realised that the only reason I believed that I had a problem was the display on the 'Serial Analyser'. I was on holiday last week and it had a firmware upgrade while I was away. So I checked through the settings and found that the number of data bits was set to 7! (when it should have been & was previously 8)

I use the Analyser almost every day and I never change the settings, so it just didn't occur to me that it might be wrong ..... until you asked me how I knew it was writing the data that was the problem. You can probably tell I am very happy to have resolved it!

Thank you, thank you, thank you Big Grin | :-D

Ali

Open a file.myext via contxt menu in my application

robert_s12-Jul-04 3:57

robert_s

12-Jul-04 3:57

Hi. I recently wrote a small MFC app that saves files in my own format .cmp
I also managed to associate this file extension with windows so my files have their own cutom icon rather than the default windows one. I learned how to do it from here (cool stuff): http://www.codeproject.com/w2k/extendingshell.asp

Now I am facing one problem. When I double-click on any saved file say stored on my desktop then my application opens as it should but it doesnt open my file.

Obviously its because when my application initializes it should know the name of the file that I selected to open but I am not sure how to retieve this info. I guess when I right-click on the saved file and select from a context menu "Open this (.cmp) in my app" the shell Command will call my app and somehow pass the name of the file.

So basically I am not sure how to read this command line arguments in my MFC app so I could get the name of the file and open it immediately after my app initialization. Actually would it be a command line or some other way of doing it? how do I tell my app what file I am opening.?
Please let me know if its very easy solution for it.

In that tutorial the author calls:

C:\Windows\Notepad.exe %1

but I guess "%1" means nothing to my app as my app would not recognise what that is. I think I should replace %1 with my own command like "open" or "print" to distinguish the action my app should perform. Am I right? Please let me know if you could. Thank you..

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