Convert CString 0-9 and a-f to hex value 1

[tmoody]

I'm having a little trouble converting user input to it's hex equal. I have a DDV to validate a CString of 0-9 and a-f(or A-F), thanks to DaveTips, when the user types it in, but now I need to convert it to hex to send that value out a port. this seems pretty simple, but I am stumbling over it. After the user enters data I have a string, as an example, "5A". I need to convert that to an integer of 0x5A or 90 decimal. Thanks in advance

 

[raochetan]

I do not remember currently any functions which can convert. If there is i do not know. But u can write a function on ur own which will convert a string to integer where the string is Hex notation. The code is below

CString str = "5BF";
unsigned int dec = 0;

str.MakeUpper();

for(int i = 0; i < str.GetLength() ; i++)
{
dec = (str.GetAt( strGetLength() - 1 - i ) - 'A' ) * (unsigned int) pow(16, i);
}

Hope it helps

raochetan

 

[gxlzlu]

Maybe u can use the member funtion----CString::format().U can look it in MSDN for detail.

 

[DavesTips]

Sometimes there's a use for those oldtime C functions!

CString hex(&quot;0AF&quot;
long l;
sscanf((const char*)hex,&quot;%x&quot;,&l);
Click here if this helped!
vvvvvvvvv

 

[Zyrenthian]

One more suggestion.

Strtol or strtoul with the CString as the first param, a char pointer as the second and 16 as the 3rd. The return value will be the hex value

matt