C / C++ / MFC

12-Apr-05 21:57

I have a CString mystring defined like this:
mystring="FFFFFFFFFFFFFFFF";//16 F
How can I convert programatically that to a LONLONG ?
Thanks for any help.

Joel Holdsworth12-Apr-05 22:17

12-Apr-05 22:17

Good morning fardak. I've got some code for you here. Hopefully it will be less messed up than yesterday's effort:

LONGLONG result = 0;
int cursor = 0;
int length = _tcslen(mystring);

for(int i = 0; i < length; i++)
{
	result <<= 4;
	if(mystring[i] >= _T('0') && mystring[i] <= _T('9'))
		result |= (mystring[i] - _T('0')) & 0x0F;
	else if(mystring[i] >= _T('a') && mystring[i] <= _T('f'))
		result |= (mystring[i] - _T('a') + 10) & 0x0F;
	else if(mystring[i] >= _T('A') && mystring[i] <= _T('F'))
		result |= (mystring[i] - _T('A') + 10) & 0x0F;
	else if(mystring[i] != _T(' ') &&
		mystring[i] != _T('\t'))	// Any characters that you want to ignore
		break;				// Otherwise stop scanning if we encounter any non-hex characters
	cursor++;
	if(cursor >= sizeof(result) * 2)	// Stop scanning when we reach the require number of digits
		break;				// You could have an "overflow" error message sent here, if you want
}

Hope this helps you.

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

fardak12-Apr-05 22:34

12-Apr-05 22:34

Good morning Joel,and thanks for your prompt answer.
My God I am not that fast programming!
I'll study your code try it and get back to you as soon as I can.
Have a nice day.

Joel Holdsworth12-Apr-05 22:44

12-Apr-05 22:44

Just noticed one minor bug. The code should be like this:

LONGLONG result = 0;
int cursor = 0;
int length = _tcslen(mystring);

for(int i = 0; i < length; i++)
{
	result <<= 4;
	if(mystring[i] >= _T('0') && mystring[i] <= _T('9'))
		result |= (mystring[i] - _T('0'));
	else if(mystring[i] >= _T('a') && mystring[i] <= _T('f'))
		result |= (mystring[i] - _T('a') + 10);
	else if(mystring[i] >= _T('A') && mystring[i] <= _T('F'))
		result |= (mystring[i] - _T('A') + 10);
	else if(mystring[i] == _T(' ') ||
		mystring[i] == _T('\t'))	// Any characters that you want to ignore
		continue;				// Otherwise stop scanning if we encounter any non-hex characters
	else break;
	cursor++;
	if(cursor >= sizeof(result) * 2)	// Stop scanning when we reach the require number of digits
		break;				// You could have an "overflow" error message sent here, if you want
}

The reason I'm making all these mistakes, is that i've got no compiler to test this stuff on right now!

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

fardak12-Apr-05 23:27

12-Apr-05 23:27

Thanks.
I did not study the code yet,but both codes compile without error and both give the same result.
I put the code in a function and added these three lines to se the result.
///////////////////////
CString message;
message.Format("%16x",result);
SetDlgItemText(IDC_MYRESULT,message);//Edit trol
///////////////////////////////////
The string I gave is "fffffffffffffff" //16 f
The answer I've got is :
ffffffff //8f !!
So it is as if the high "ffffffff" are ignored !
Maybe the loop should be extended ??

Joel Holdsworth12-Apr-05 23:39

12-Apr-05 23:39

Yeah, that's what you'd expect. As this article[^] explains putting %x will only cause an int (32 bits) to be printed not your LONGLONG (64 bits). You could try something like this instead:

message.Format("%8x%8x", (int)(result>>32), (int)(result & 0xFFFFFFFF));

I've simply split the upper and lower dwords out, and then printed them one after another!

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

fardak13-Apr-05 0:02

13-Apr-05 0:02

I changed the "message.Format(..)" as you suggested,and the code compiles,runs and gives the result expected(i.e both dwords are dislpayed in the edit control).
Thank you so much for your time and effort.
I am sure your skill will be soon appreciated by someone.
Good luck.

David Crow13-Apr-05 2:36

David Crow

13-Apr-05 2:36

What about using:

message.Format("%I64x", ...);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Joel Holdsworth13-Apr-05 3:21

13-Apr-05 3:21

Ah yes... Well I've never used that one before!

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

fardak13-Apr-05 4:42

13-Apr-05 4:42

Thank for your time.
It works perfectly well.

Michael Dunn13-Apr-05 2:20

Michael Dunn

13-Apr-05 2:20

Use _atoi64()

--Mike--
Visual C++ MVP Cool | :cool:

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fardak13-Apr-05 4:35

13-Apr-05 4:35

Thank you.
I have difficulty formatting a string to display the result.
Here is what I wrote:
//////////////////////////////////
CString message;
_int64 myNb;
myNb=_atoi64("FFFFFFFFFFFFFFFF");
message.Format("%16X",myNb);//WRONG
How the formating should be written ?
Thanks for any help.

Michael Dunn13-Apr-05 7:22

Michael Dunn

13-Apr-05 7:22

Because %X is used to format a 4-byte integer. When you pass an 8-byte integer, use the I64 size modifier: %16I64X.

--Mike--
Visual C++ MVP Cool | :cool:

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Strange things are afoot at the U+004B U+20DD

fardak13-Apr-05 22:44

13-Apr-05 22:44

Thank you.
I am trying to find the value of a LONLONG
and display it in decimal.
This is what I wrote
//////Convert LONGLONG to binary ///////////
TCHAR mystring[sizeof(LONGLONG)*8+1]
for(int i = 0; i < sizeof(LONGLONG)*8; i++)
mystring[i] = ((theNb >> (sizeof(LONGLONG)*8 - i - 1)) & 1) ?
_T('1') : _T('0');
mystring[sizeof(LONGLONG)*8] = 0; //mystring[64]=0:
//////////
_int64 result,partResult;

for( int n=0; n<=63; n++)
{ partResult =( mystring[63-n]*(int)pow(2,(63-n) ) );
result =result+partResult;
}
//////////// Format to display result
CString strResult;
strResult.Format("%16I64d",result);
GetDlgItem(IDC_MYRESULT)->SetWindowText(strResult);

fardak13-Apr-05 22:50

double to char conversion vc++

13-Apr-05 22:50

(Sorry I don't know how to call back the thread to edit it )
The result should be:(if i'm not mistaking)
184 467 440 737 095 516 15
which I am not getting.
Is my formatting wrong ?

directx

shumyla198312-Apr-05 21:36

shumyla1983

12-Apr-05 21:36

hi i need some help to find the library QuartzTypeLib.dll. and from where can i get this library.plz reply me soon.

best regards.

shumyla

Re: directx

22491712-Apr-05 22:04

224917

12-Apr-05 22:04

You can create it by using TlbImp.exe An msdn example is here[^]

suhredayan
There is no spoon.

nehathoma12-Apr-05 21:04

nehathoma

12-Apr-05 21:04

anybody plz tell me how to do double to char conversion in vc++?

Cedric Moonen12-Apr-05 21:08

Cedric Moonen

12-Apr-05 21:08

You mean converting a double into a string (char*) ? You can use sprintf function like that:

char szString[255];<br />
double Value = 0.521;<br />
sprintf(szString,"%.3f",Value);

Take a look at the doc to see how to play on each parameters (for example the '.3' part above is for telling the function it has to print 3 digits after the floating point).

Hope this helps

Anonymous12-Apr-05 21:15

Anonymous

12-Apr-05 21:15

Check this article .....it will help you .

www.codeproject.com/cpp/data_conversions.asp

Cheers .

John R. Shaw12-Apr-05 21:36

John R. Shaw

12-Apr-05 21:36

Well, the simpilist way is to use the C-languages sprintf function:

char szBuf[512]; // assumes: number of digits (+ '\0') is < 512
sprintf(szBuf,"%f",double_value);

There are other ways to do the convertion in VC++, so explore and find them (some of them are safer, but not portable).

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen