C / C++ / MFC

bhanu_reddy094-Aug-09 22:34

bhanu_reddy09

4-Aug-09 22:34

Many thanks for your replies and suggestions. Actually I read a data from the serial device and it is having the ASCII value 6 and the corresponding character for 6 is '♠'. I just give the previous code as an example.

//the actual data will be
szData[0] = 0x06;//from a serial device

Now, I want to display the corresponding character (received from serial device) for 0x06 in the CEdit. Please advice me.

CPallini4-Aug-09 23:47

4-Aug-09 23:47

bhanu_reddy09 wrote:
szData[0] = 0x06;//from a serial device

This is a ASCII control character (ACK, see [^]), i.e. not printable.
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]

Souldrift4-Aug-09 22:38

Souldrift

4-Aug-09 22:38

This line

szData[0] = '♠';

produces a compiler warning doesn´t it?

♠ is not an ANSI character, afaik.

If you use an actual ansi sign like '®' in your code, it works properly.

Souldrift

bhanu_reddy094-Aug-09 22:42

bhanu_reddy09

4-Aug-09 22:42

Yes, I got compiler warning but how to change the character 0x06 to Unicode and display properly in the CEdit.

Thanks...

Souldrift4-Aug-09 23:28

Souldrift

4-Aug-09 23:28

I am not sure if this can be done since 0x06 (actually the first 32 codes) are designated control characters.
0x06 being ACK code for data transmission, I think.

Sorry to not be of more help.

Souldrift

Edit: http://www.handheld-basic.com/documentation/text/page_599.html[^]

memcpy and buffer concatenation

bhanu_85095-Aug-09 2:50

bhanu_8509

5-Aug-09 2:50

Dear All,

I have tried in many possible ways but I cannot display the character ♠. The real problem is that I need to change my entire project to UNICODE but this is not possible for right now. I also tried the below and even not working.

wchar_t display[2];
display[0] = 0x2660;
display[1] = 0;
edit.SetWindowText(display); //This only works when I change the project into UNICODE.

Is there any possible way to do simply. Many thanks in advance.

_MailItemPtr

john56324-Aug-09 21:15

john5632

4-Aug-09 21:15

Hi All,

I am getting exception in code:

temp=g_pNsp->GetFolderFromID(_bstr_t(szEntryID));
pitem=temp->Items;
for (int i=1;i<=pitem->Count;i++)
pMail=pitem->Item(i);

Somtimes I am getting pMail=0x000000 but there is emails inside that folder,
I think item will not be MailItem. How to type cast of check for MailItem?

Re: _MailItemPtr

Souldrift4-Aug-09 23:57

Souldrift

4-Aug-09 23:57

Are you sure you want to start the loop with i=1 ???

Souldrift

Madhu_Rani4-Aug-09 21:10

Madhu_Rani

4-Aug-09 21:10

Hi,

I am reading data from a socket (i.e Array of BYTES, lpData)... I stored the incoming data in a buffer by using memcpy( bmpBuffer,lpData, dwCount);

Now I received some more data... ( data is coming continuously)...

Now I want to augment the bmpBuffer with the incoming data (till the time I receive the last packet,) What function I can call to augment the coming data in existing buffer.

To explain more, as we can add two strings str="Hello" + "Hi", How we can add data of two buffers

CPallini4-Aug-09 21:20

4-Aug-09 21:20

for instance:

char buf[100];
const char * str1 = "Hello";
const char * str2 = "Hi";
char * ptr = buf;
unsigned int len;

len = strlen(str1);
memcpy(ptr, str1, len);
ptr += len;
len = strlen(str2);
memcpy(ptr, str2, len);
ptr += len;

// The two lines below just to have a NULL terminated string
*ptr = '\0'; 
ptr++;

In a real world case, you probably want to allocate dynamically the memory buffer (and increase its size whenever it is needed).
Smile | :)

Madhu_Rani4-Aug-09 21:39

Madhu_Rani

4-Aug-09 21:39

YES. U are right ...

BYTE* bmpBuffer=NULL;
bmpBuffer=(BYTE*)GlobalAlloc(GMEM_ZEROINIT,size);
memcpy( bmpBuffer,lpData, dwCount);

How I may increase the size of bmpBuffer at run time? Should I create a BIG buffer (upto 3 Mb to accomodate the incomimg image) or I can manage to increase the size of buffer on request as well...

CPallini4-Aug-09 21:54

4-Aug-09 21:54

If you use HeapAlloc [^] function (instead of GlobalAlloc) then you have the option to use also HeapReAlloc [^] for the purpose.
If you're stuck with GlobalAlloc then you have to allocate a new, bigger memory block whenever is required, copy the original block content on the newer one and then free the original block.
Smile | :)

«_Superman_»4-Aug-09 21:22

«_Superman_»

4-Aug-09 21:22

You can use memcpy for concatenation.
Only thing is that you must correctly specify the offset.

When the first packet is received - memcpy(bmpBuffer, lpData, dwCount);
Increment a count variable - dwTotalCount += dwCount;
When the next packet is received - memcpy(bmpBuffer + dwTotalCount, lpData, dwCount);

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

Madhu_Rani4-Aug-09 21:33

Madhu_Rani

4-Aug-09 21:33

Thanks both of you

avi cap wrapper frame grabber

Rajesh R Subramanian5-Aug-09 1:17

Rajesh R Subramanian

5-Aug-09 1:17

Hello,

How are you knowing how many bytes are to be read? I've seen most people throw some random and huge number at it. You might want to try IOCtl with FIONREAD this if you aren't doing it already there:

DWORD dwHowMuch = 0;
IOCtl(FIONREAD, &dwHowMuch); //After this call, <code>dwHowMuch</code> will tell you how many bytes should be read with the Receive call.
Receive(m_szBuffer.GetBuffer(dwHowMuch), /*other params*/);
szBuffer.ReleaseBuffer(-1); 

//Now, szBuffer has the data received from the socket.

Note that I'm letting CString do the gruesome stuff of memory allocation and deallocation for me (because CString already has a GetBuffer() method, and I can exploit that here). I'm not proposing this as an excellent solution, but it works and you will be free of any hand-crafted memory management that you might want to implement. I, for once, believe that CString will manage the memory much better than we do (OK, we can write something better, but what the heck... OOP is about reusability and what GetBuffer() has to offer has been good enough for me).

Also note that passing a number to CString::GetBuffer() will dynamically 'adjust' the string buffer to hold at least "that much" bytes that was passed to it (mind you this does not include the terminating zero character, but here, we aren't dealing with a string anyways). This will ensure you won't run out of memory and if the previously allocated memory was good enough to hold the data to be currently received, no harm is done!

I assumed that you're using MFC, but if you are not, I see your query is already answered. Also, note that you don't 'need' MFC as such if you want to just use CString.

It is a crappy thing, but it's life -^ Carlo Pallini

vvlnkishore4-Aug-09 20:47

vvlnkishore

4-Aug-09 20:47

Hi,
I want to know what i sthe image format of the image in the frame grabber code in GETDIB function.where is the image getting stored?

Re: avi cap wrapper frame grabber

Randor 5-Aug-09 16:01

Randor

5-Aug-09 16:01

I dont know what GETDIB function you are referring to... there is no reference of this function on MSDN however DIB implies Device-Independent Bitmap[^] which is essentially a BMP formated bitmap[^].

Best Wishes,
-David Delaune

Re: avi cap wrapper frame grabber

vvlnkishore5-Aug-09 23:08

vvlnkishore

5-Aug-09 23:08

where does the image get saved when it is captured? what is the format?

Hello question about hooking function by using irregualar jumps like ret/push

nah13374-Aug-09 20:29

nah1337

4-Aug-09 20:29

So i want to avoid 0xE9, 0xEB and hook function using like push/ret. Is it possible to do so, is this a specific hooking method, anyone has any examples or tutorials, i didnt find any in google.

Thnx, members!

CObject..

p_19604-Aug-09 20:11

p_1960

4-Aug-09 20:11

hi,
im confused with Cobject basic services..

Serialization support

Run-time class information

Object diagnostic output

Compatibility with collection classes

can u pls explain..

Re: CObject..

CPallini4-Aug-09 21:00