Qt下QByteArray的使用 Qt

今天遇到一个问题，想要实现一种功能：在QLineEdit中书写16进制字符串比如 00 01 ff，然后保存为16进制转换后的字节形式到内存中，然后在文件中进行查找字符串匹配，后来发现QByteArray QByteArray::fromHex(const QByteArray & hexEncoded)函数可以实现这个功能。
QByteArray QByteArray::fromHex(const QByteArray & hexEncoded)
Returns a decoded copy of the hex encoded array hexEncoded. Input is not checked for validity; invalid characters in the input are skipped, enabling the decoding process to continue with subsequent characters.
For example:

QByteArray text = QByteArray::fromHex("517420697320677265617421"); text.data(); // returns "Qt is great!"

对于字符串匹配查找方面，我用的是泛型函数库algorithm中的search函数：
具体用法请到:http://www.cplusplus.com中查询，这里只给出例子:

// search algorithm example #include // std::cout #include// std::search #include // std::vectorbool mypredicate (int i, int j) { return (i==j); }int main () { std::vector haystack; // set some values:haystack: 10 20 30 40 50 60 70 80 90 for (int i=1; i<10; i++) haystack.push_back(i*10); // using default comparison: int needle1[] = {40,50,60,70}; std::vector::iterator it; it = std::search (haystack.begin(), haystack.end(), needle1, needle1+4); if (it!=haystack.end()) std::cout << "needle1 found at position " << (it-haystack.begin()) << '\n'; else std::cout << "needle1 not found\n"; // using predicate comparison: int needle2[] = {20,30,50}; it = std::search (haystack.begin(), haystack.end(), needle2, needle2+3, mypredicate); if (it!=haystack.end()) std::cout << "needle2 found at position " << (it-haystack.begin()) << '\n'; else std::cout << "needle2 not found\n"; return 0; }

【Qt下QByteArray的使用】Output:
needle1 found at position 3
needle2 not found