How can I parse specified fields from given txt query - c++

Question

C++ question:
I have the query in txt like this:
CUSTOMER_ID=4155&ORDER_ITEM_TYPE_ID=1&ORDER_ITEM_TYPE_NAME=Product&ORDER_ITEM_SKU=&ORDER_CURRENCY_CODE=UAH
How can I get these fields to make it look nearly like:
Customer_ID: 4155
ORDER_ITEM_TYPE_ID: 1
// and etc...
I know there is a separator "&" between each field, but I don't know how to do it properly.

Answer 1

Use methods of std::string like find,substr. Example:
const std::string field = "CUSTOMER_ID=4155&ORDER_ITEM_TYPE_ID=1&ORDER_ITEM_TYPE_NAME=Product&ORDER_ITEM_SKU=&ORDER_CURRENCY_CODE=UAH";
const char separator = '&';
const char equal = '=';
std::string::size_type cur = 0;
while ( cur != std::string::npos )
{
std::string name;
std::string value;
std::string::size_type newPos = field.find(equal, cur);
if ( newPos != std::string::npos )
{
name = field.substr( cur, newPos - cur );
cur = newPos + 1;
newPos = field.find(separator, cur);
value = field.substr( cur, ( newPos == std::string::npos ) ? std::string::npos : newPos - cur );
cur = ( newPos == std::string::npos ) ? std::string::npos : newPos + 1;
std::cout << name << ": " << value << std::endl;
}
else
{
break;
}
}

Answer 2

try
`char str[10][20];
int len = 0;
int count = 0;
while((c = string[i])!= EOC )
/* EOC : End of Character */
{
if (c == '&') {
str[count][len] = '\0';
len = 0;
count++;
continue;
}
str[count][len] = c;
len++;
}

Answer 3

Replace all '&' with replace and then when you write the data after this back into a file it's formated as requested.
std::ifstream infile("thefile.txt");
while (std::getline(infile, line)) //Read File line by line
{
std::replace( line.begin(), line.end(), '&', '\0'); // replace all '&' to '\0'
cout << line << endl;
}