C / C++ / MFC

2-Mar-06 1:35

I have string of Hex values,so i should concatenate two hex values from the string and wanted to convert these Hex values to Binary format and after converting to binary, how should i mask the last three binary values?

toxcct2-Mar-06 1:45

toxcct

2-Mar-06 1:45

srija wrote:
the last three binary values

are you talking about bits, bytes, or something else ?

to convert from hexa representation to binary representation, it's easy. each hex character equals 4 bits :

CString strBinary;
switch (char cHex) {
  case '0': strBinary = "0000"; break;
  case '1': strBinary = "0001"; break;
  case '2': strBinary = "0010"; break;
  case '3': strBinary = "0011"; break;
  case '4': strBinary = "0100"; break;
  case '5': strBinary = "0101"; break;
  case '6': strBinary = "0110"; break;
  case '7': strBinary = "0111"; break;
  case '8': strBinary = "1000"; break;
  case '9': strBinary = "1001"; break;
  case 'A': strBinary = "1010"; break;
  case 'B': strBinary = "1011"; break;
  case 'C': strBinary = "1100"; break;
  case 'D': strBinary = "1101"; break;
  case 'E': strBinary = "1110"; break;
  case 'F': strBinary = "1111"; break;
}

srija2-Mar-06 1:56

2-Mar-06 1:56

I said about bits. I have array[6]={0x7D 0x0c 0x2f 0x65 0xA5 0x4B}...
I should convert all Hex bytes to Binary format and then i should concatenate.
for Eg:0001111111111111, now i should mask the last three bits i,e 000.

toxcct2-Mar-06 2:01

toxcct

2-Mar-06 2:01

if only the 3 bits are important for you there, you don't need to make all the concatenation stuff... only get the last byte (here 0x4B), cast it into an int (char c = array[5]) and mask it : c = c & 0x07

binary to decimal

srija2-Mar-06 5:05

2-Mar-06 5:05

Yes, you are correct, just i used strcat(), it worked for me.
now i got one more problem, how can i represent a binary value of 11100001110 into a decimal?

David Crow2-Mar-06 6:42

David Crow

2-Mar-06 6:42

srija wrote:
...how can i represent a binary value of 11100001110 into a decimal?

Are you wanting to know how to represent a base-2 number as base-10 instead?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

chaitanya222-Mar-06 6:55

chaitanya22

2-Mar-06 6:55

Can i use atoi function????plz check this??

s[20]=11100001110
int power = 1;
int sum = 0;
for (int i = l-1; i >= 0; l--)
{sum += power * atoi(s[i]);
power = power * 2;
}
printf("%d", sum)

srija2-Mar-06 7:40

2-Mar-06 7:40

but atoi fuction si not working

David Crow2-Mar-06 7:42

David Crow

2-Mar-06 7:42

Why go to all of this trouble when strtoul() will work just fine?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

srija2-Mar-06 7:05

2-Mar-06 7:05

yes, i need it so... the value of 11100001110. i,e some 1806 or so...

How to wait untill created process finishes.

walter762-Mar-06 1:55

walter76

2-Mar-06 1:55

I am not sure what you mean with masking, but if you like to extract a hexadecimal value from a string and want to set the last 3 bits to 0 you can do it like this:

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv) {
    char myHexString[] = "1A";
    unsigned char myByte = 0x0;
    sscanf(myHexString, "%X", &myByte);
    myByte &= 0xF8; // set the last three bits of the byte to 0
    printf("%d, 0x%x\n", myByte, myByte);
    return 0;
}

Hope that helps you out.

Walter

-- modified at 7:55 Thursday 2nd March, 2006

Custom Recordset

Malli_S2-Mar-06 1:32

Malli_S

2-Mar-06 1:32

Hello Friends !
I wanna to implement custom recordset (with dynamic fields,i.e. not from any table). Here I can do in VB as below :
'ResponseInfo is an ADODB recordset.
Public ResponseInfo As ADODB.Recordset
Set ResponseInfo = New ADODB.Recordset
Do Until <somecondition_overhere>
ResponseInfo.Fields.Append "FieldName", adVarChar, 250
Loop

ResponseInfo.Open
ResponseInfo.AddNew
'some blaa blaa
ResponseRs.MoveFirst

Do Until ResponseRs.EOF
'some blaa blaa code over here
ResponseRs.MoveNext
Loop

hope so, you've got what I wanna to do. Here I'm just building the recordset with dynamic field definitions, no query/table is used to build the recordset. So, I tried the same in VC++ (using #import "msado15.dll") , but it's not working. The open() requires the parameters, is there any other solution for this, so that i can build the recordset with custom columns (not building rset from any table/database).
Please get me some help...!!! Sniff | :^)

-Malli...!

Re: Custom Recordset

Xing Chen2-Mar-06 15:18

Xing Chen

2-Mar-06 15:18

you can specify the SQL query string to _RecordsetPtr after you build the table,like

m_pRecordSet->Open("Select name,caption from users", m_pConnectionString, <br />
			adOpenKeyset, adLockOptimistic, adCmdText);

9ine2-Mar-06 0:37

9ine

2-Mar-06 0:37

If we luanch console app from win app with createprocess() it returns immediatly while for example if console app takes several secs to execute can we make createprocess() run in blocking mode that is it should not return until console app terminates??

9ine

Stephen Hewitt2-Mar-06 0:48

Stephen Hewitt

2-Mar-06 0:48

STARTUPINFO si;
PROCESS_INFORMATION pi;

ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
ZeroMemory( &pi, sizeof(pi) );

// Start the child process.
CreateProcess(
NULL,
"C:\\Windows\\Notepad.exe",
NULL,
NULL,
FALSE,
0,
NULL,
NULL,
&si,
&pi );
CloseHandle(pi.hThread);

// Wait until child process exits.
WaitForSingleObject(pi.hProcess, INFINITE);

CloseHandle(pi.hProcess);

Steve

9ine2-Mar-06 2:06

9ine

2-Mar-06 2:06

Great thanks.
But should we close thread handle before process is terminated?

9ine

Stephen Hewitt2-Mar-06 2:15

Stephen Hewitt

2-Mar-06 2:15

Closing a thread or process handle doesn't terminate the thread or process.

Steve