On Monday, 26 March 2012 at 07:14:50 UTC, Ali Çehreli wrote:
On 03/25/2012 08:26 AM, AaronP wrote:
Could I get a "hello, world" example of parsing json? The docs
look
simple enough, but I could still use an example.
For what it's worth, I've just sent the following program to a
friend before seeing this thread.
1) Save this sample text to a file named "json_file"
{
"employees": [
{ "firstName":"John" , "lastName":"Doe" },
{ "firstName":"Anna" , "lastName":"Smith" },
{ "firstName":"Peter" , "lastName":"Jones" }
]
}
2) The following program makes struct Employee objects from
that file:
import std.stdio;
import std.json;
import std.conv;
import std.file;
struct Employee
{
string firstName;
string lastName;
}
void main()
{
// Assumes UTF-8 file
auto content = to!string(read("json_file"));
JSONValue[string] document = parseJSON(content).object;
JSONValue[] employees = document["employees"].array;
foreach (employeeJson; employees) {
JSONValue[string] employee = employeeJson.object;
string firstName = employee["firstName"].str;
string lastName = employee["lastName"].str;
auto e = Employee(firstName, lastName);
writeln("Constructed: ", e);
}
}
The output of the program:
Constructed: Employee("John", "Doe")
Constructed: Employee("Anna", "Smith")
Constructed: Employee("Peter", "Jones")
Ali
Your example only works if the json file in UTF-8 (BOM), how to
make sure that it worked with the files in UTF-8 without BOM.
