windows.h program compiles but doesnt run - c++

Question

I am writing a program with the windows API and it has two files. The first program is a function to draw a pixel, and the second program handles the window. I'm compiling using g++ main.cpp graphics.cpp -o main -lgdi32, it will compile but when I try to run it nothing happens, there are no errors.
Graphics.cpp
#include <windows.h>
#include <time.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
static HWND hwnd { 0 };
void DrawPixel(HWND hwnd, int x, int y);
int WINAPI
WinMain (HINSTANCE hInstance, HINSTANCE hPrevInst, LPTSTR lpCmdLine, int nShowCmd) {
MSG msg;
WNDCLASSW wc = {0};
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpszClassName = L"Pixels";
wc.hInstance = hInstance;
wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc.lpfnWndProc = WndProc;
wc.hCursor = LoadCursor(0, IDC_ARROW);
RegisterClassW(&wc);
CreateWindowW(wc.lpszClassName, L"Pixels",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
100, 100, 300, 250, NULL, NULL, hInstance, NULL);
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
srand(time(NULL));
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam) {
switch(msg) {
case WM_PAINT:
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProcW(hwnd, msg, wParam, lParam);
}
void DrawPixel(int x, int y) {
PAINTSTRUCT ps;
RECT r;
GetClientRect(hwnd, &r);
if (r.bottom == 0) {
return;
}
HDC hdc = BeginPaint(hwnd, &ps);
SetPixel(hdc, x, y, RGB(255, 0, 0));
EndPaint(hwnd, &ps);
}
main.cpp
#include <iostream>
#include <windows.h>
#include <windef.h>
void DrawPixel(int x, int y);
int main(){
DrawPixel(100, 100);
}
I am pretty sure it has something to do with the windows handle and how I am retrieving it but no matter how I refactor my code it wont work.
Edit: It turns out the issue is that the WinMain function isnt running.