ListCtrl in MFC

[2kaud]

I don't know MFC, and I last used win32 API when XP was the current OS!

However, for testing I used a vector of pair to simulate the list and displayed to the console. Given:

#include <map>
#include <vector>
#include <string>
#include <iostream>
#include <utility>
#include <iomanip>

using namespace std;

int main()
{
	const map<int, vector<int>> m = {{ 1, {1,3,4 }} ,{ 2, {4,5,6 } }};
	const map<int, string> n = {{ 1, "Site1", } , { 2, "Site2"} ,{ 3, "Site3" },{ 4, "Site4" },{ 5, "Site5" },{ 6, "Site6" }};

	vector<pair<string, string>> output;
	bool bIsfirstCentralsite {false};

	for (const auto pair : m) {
		string centreId;

		bIsfirstCentralsite = true;

		if (pair.first == 1)
			centreId = "first";
		else
			centreId = "second";

		for (const auto site : pair.second) {
			if (bIsfirstCentralsite)
				output.emplace_back(centreId, "");
			else
				output.emplace_back("", "");

			const auto itr {n.find(site)};

			if (itr != n.end())
				output.back().second = itr->second;

			bIsfirstCentralsite = false;
		}
	}

	for (const auto& out : output)
		cout << left << setw(8) << out.first << setw(8) << out.second << '\n';
}

This displays:

first   Site1
        Site3
        Site4
second  Site4
        Site5
        Site6

so this algorithm seems OK. The issue would appear to be in use of the list control.

PS It looks like the list is being sorted by site. Are there any sorting criteria set anywhere?