Converting chars to QByteArray...

mzimmers

...with the wrinkle that the chars are a hex representation. So I need to take two characters, turn it into a hex value and make that a byte in a QByteArray. I'd do it manually, but these strings are thousands of characters. Any slick way to do this?

Thanks...

jsulm

@mzimmers It is not clear to me what you are doing. A char as at least one byte - how do you put two chars into one byte?
To put a char into QByteArray:

char ch = 0x42;
QByteArray array;
array.append(ch);

Here http://doc.qt.io/qt-5/qbytearray.html you can find this example:

const char cart[] = {'c', 'a', '\0', 'r', '\0', 't'};
QByteArray ba4(QByteArray::fromRawData(cart, 6));
ba4.size();                     // Returns 6.
ba4.constData();                // Returns "ca\0r\0t" without terminating \0.

aha_1980

@mzimmers: QByteArray::fromHex()

Edit: direct link is: http://doc.qt.io/qt-5/qbytearray.html#fromHex

mzimmers

Here's what I'm talking about: I'm given a string like this:

    char  Txt8[] =                                              //  Len = 1054 BYTES
                "e5098b6a0b1cfc57c6a76537104a39c48baecb15c6bbb46fbb0b745f9c9e5c05"
                "cfcfabb33786f7b7b5b0ce74eeec9eb84f87d2494fab3ec1f4d3bd9c99821890"
                "ee352a1d40964264fbf2c93c6ded2583cc75dcb27bf4fdb489cabcf97bfa5cc6"
                "4b2352cfb0b3a707a0579eb713b697cd0b5e3377d1feb9f181d7b89cc86dee4f"
                "ed8269f10e44ec48adc6940c6badbb40122c1dc2d9323920e4e1fbad0b4397d4"
                "dc38b8ade3b3dace2926f464fa3b5b82ebc5e3b81cf647e8bbd2cb55c9e31ffd"
                "212f8729b66739421c6106e64ac83d3b9e13cd8321b3a9f10d9171bb8cb74e71"
                "c34d1e8d0fc8d14b8e5e12bbe2bd2a1431fc224b70d228e4e2063509db26ecd9"
                "ca7cc402763e69928805600a4a80eab4ae6a2c3792b98c6942195e643f98c0dc"
                "3fa3c2b07431cbbe113e38fc0b7b45c51c4431700ed29d2736b236f63f759323"
                "29aa60be9009bd7832f1e1b9ac1503ec84727a1e6c8423c7c5b903e763262d55"
                "9078e654532e0868f206a468b5b5ebd3eddb4f673536e5f0f8160e5f3311561b"
                "7cf79c9c440974355965c931aec5c7225f69f776f052ac4bd6b19f85389fd61d"
                "f60ecabbeb00c8886ff7983d20ac5d81e303bc71253f40806772fd81f9387402"
                "05a5b7dcd07cce083da258b493d275967f91e4815d656936b342727cfe45f973"
                "b2a5ac257ce64c5eca4f53be8d9fd90c3dfcb8cd1e2cef15c307449ed02c2e17"
                "04f4f1be76a40b311ee7cf81987b5089252a807ef3fc99c79eabbc0ef657d897"
                "037bced04620d32a425015283bcea1b53e0484bb613d30f14c1422f5f82cc29a"
                "b7228b8375c06bf13d746dd9ff00953a90720badf2577d3ed62cbe7a5f15b3c9"
                "29d26ffe8aee9d2d17391ebc6a79f4bd235d5f7b2db2455343d9d7c6b27972cc"
                "6071c36a0d112f86d98972fb06a186e900abc64e9ab653db9b05b70079c0c84a"
                "64e8cfee8690eaa68a4bafbb5be112632e46894ec2cc6e7ce697a4513d517deb"
                "3e20dbb37ed5963232671e27ef9f62d6b514f0a22c5a5dde2d77e7e184965958"
                "f5002fe17d47fbd5d9c407644d443ce89eff427360cae9aa788dc8d7d9f62439"
                "916f139f094ee035884cb29dfa396941f0eec9e8e782da88cdc18e5bc1d9a535"
                "1b57ce15ac520ffa47e666f87fe5b18ab3c8cb2a48ecf81f36fb8397c6a7a5f5"
                "9a9fa96cedbb4ecd1c7a6d9d65afdb6bef7791600b6e0a18ba23edb06fc9ec21"
                "162feccc54f2665611f10db53401b18bade263b3b972da1a612115d144a54260"
                "97efdf5c6a5d1f3c2d318f687242f993f5f1884bd95f2ece34dd4320cea46f5a"
                "26c7c945b665402778233bdda9d97c2acd8c4a4ff39dcfdc3a3fbfc5942e3ab8"
                "ca9ff4aec17293c1fbaf583d603002f93f9befe8909485eb7c30d0e91fac6c22"
                "8c5fa6c011eddeafbdbe30af20ae53a85206c03d37ac17a30096bfb4f584cd3f"
                "72ef28a3303cea9cc636095c70bb36de0eb50577704d4faed05bd54da020";

I need to format 2 characters at a time into hex, and store them in a QByteArray. So, the first byte would take the first two characters ("e5") and create a byte of value 0xe5.

Edit: this works, but is ugly (IMO):

    QByteArray qTxt;
    uint8_t c;
    char *p;

    for (int i = 0; i < strlen(Txt8); i += 2)
    {
        p = Txt8 + i;
        sscanf(p, "%2x", &c);
        qTxt.append((char) c);
    }

I was just curious whether anyone had knowledge of a way to reduce this mess to a single line...

Sunfluxgames

QByteArray qTxt("\all your hex here", 1054);

// for loop to grab the first byte in the array

The code you posted should work fine. While do might work as well.

mzimmers

Aha's solution is the winner. Thanks, everyone.