How to convert CString to UCHAR array?

Question

I have a cstring object str = "5043", now i want to convert to Hex and put it in UCHAR array like

UCHAR sample[2];
Sample[0] = 0X50 
Sample[1] = 0X43

How can i do this? please advice me

This might have already been answered in this thread: http://stackoverflow.com/questions/3381614/c-convert-string-to-hexadecimal-and-vice-versa — David Z., Apr 20 '12 at 08:13
As a possibility for widening the scope of this question, "cstring object str" -> "string". "UCHAR" -> "unsigned char", then just leave this as a C++ question. — Adrian Conlon, Apr 20 '12 at 08:46

score 1 · Answer 1 · answered Apr 20 '12 at 08:14

1

Have you tried strol? It seems a little low tech, but should do the trick. Don't forget to pass 16 as the base...

You'll need to combine it with a little bit shifting and bitwise anding to split the result into exactly what you require, but that should be straightforward.

Hope this helps,

answered Apr 20 '12 at 08:14

Adrian Conlon

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Actually, i have already got converted value but i just need to update to UCHAR variable – Naruto Apr 20 '12 at 08:30
Hmm, in that case, I think you need a different question! i.e. How do I split an integer into two bytes? (For a sixteen bit value) You probably need to right shift 8 bits for the high byte and bitwise and (&) with 255 for the low byte. – Adrian Conlon Apr 20 '12 at 08:36

vvnraman · Accepted Answer · 2012-04-20T08:41:52.623

1

You can scan the hex values directly from the string using sscanf(), something like below:

UCHAR sample[2];
for ( int i = 0; i < str.length() / 2 ; i++) {
    sscanf( (str.substr(i*2,2)).c_str(), "%hx", &sample[i]);
}

h is for short and x is for hexadecimal obviously.

Also, this assumes that the UCHAR array is declared to be half as large as the string size.

edited Apr 20 '12 at 08:41

answered Apr 20 '12 at 08:36

vvnraman

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score 0 · Answer 3 · answered Apr 20 '12 at 08:57

0

To make your code simpler, you may use an union, e.g.

    union
    {
    UCHAR char_val[2];
    long long_val;
    };

    CString str = "5043";
    long_val = strtol(str.GetString(), nullptr, 16);
    // use char_val here

answered Apr 20 '12 at 08:57

Andriy

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How to convert CString to UCHAR array?

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