C / C++ / MFC

<font color="green">//The 4 bytes buffer</font>
 nSize = 0;
 
<font color="green">//The 4 bytes extract</font>
::memcpy(&nSize, InMsg.GetDataBuffer(), <font color="blue">sizeof</font>(nSize));
 
char* pszBuffer = new char[nSize + 1];  <font color="green">//+1 is for the trailing \0 character</font>
::strncpy(pszBuffer, <font color="green">/* your source data */</font>, nSize);
pszBuffer[nSize] = <font color="gray">'\0'</font>;
std::string strData = pszBuffer;
delete[] pszBuffer;

toxcct wrote:

pass it the integer formerly extracted ?

I appreciate your help all the time...
Eranga

toxcct wrote:

ok, so, the int is not the size of the remaining string.

toxcct wrote:

then just extract the string without taking care of nSize. can't you ?

I appreciate your help all the time...
Eranga

Eranga Thennakoon wrote:

Can give me a help

toxcct wrote:

1) so, to begin, what have you tried so far to extract the string ?

<br />
		char* varBuffer = new char[(InMsg.GetDataLength() - 4)];<br />
		string var_name(&InMsg[3], (InMsg.GetDataLength()-4));<br />

toxcct wrote:

2) is the string of a constant length ?

toxcct wrote:

3) can you know its length by any method ?

I appreciate your help all the time...
Eranga

toxcct wrote:

is the string is nul-terminated ?

toxcct wrote:

what is the type of InMsg ???

I appreciate your help all the time...
Eranga

jhwurmbach wrote:

(InMsg+sizof( first_part)

I appreciate your help all the time...
Eranga

toxcct wrote:

char* pszBuffer = new char[nSize + 1];

toxcct wrote:

::strncpy(pszBuffer, InMsg.GetDataBuffer(), nSize);

I appreciate your help all the time...
Eranga

Eranga Thennakoon wrote:

toxcct wrote:
::strncpy(pszBuffer, InMsg.GetDataBuffer(), nSize);

error C2664: 'strncpy' : cannot convert parameter 2 from 'BYTE *' to 'const char *'

CPallini wrote:

You can esplicitely cast the pointer.

I appreciate your help all the time...
Eranga

Eranga Thennakoon wrote:

I know that after reading the initial 4 bytes of the stream, stream points to the next byte start position.

toxcct wrote:

34 bytes on a 64 bits system

CString sText;
int nSel;
nSel = m_MyList.GetSelectionMark();
if (sel != -1)
{
  sText = m_MyList.GetItemText(nSel, 0);
}

Johpoke wrote:

short Selected = m_MyList.GetSelectionMark();