API 질문드려봅니다.

먼저 과제임을 밝힐게요

저번주 예비군을 갔다와서 너무 놓친 부분이 많은데

지금 하는 과제는 오목판처럼 그림을 그리고 네모 안을 클릭시 동그라미를 나타내는 과제입니다.

밑에 소스는 강의 때 알려주셨던 소스고요..

이 소스 자체가 과제를 의미하는 거같은데, 잘 안되서 염치불구 질문드려봅니다 ... ㅜㅜ

수정부분과 설명을 달아주시면 보고 공부할 수 있게 도와주세요

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

HINSTANCE g_hInst;

LPCTSTR lpszClass = TEXT("현선오_2015032161");

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance

, LPSTR lpszCmdParam, int nCmdShow)

{

HWND hWnd;

MSG Message;

WNDCLASS WndClass;

g_hInst = hInstance;

WndClass.cbClsExtra = 0;

WndClass.cbWndExtra = 0;

WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);

WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

WndClass.hInstance = hInstance;

WndClass.lpfnWndProc = WndProc;

WndClass.lpszClassName = lpszClass;

WndClass.lpszMenuName = NULL;

WndClass.style = CS_HREDRAW | CS_VREDRAW;

RegisterClass(&WndClass);

hWnd = CreateWindow(lpszClass, lpszClass, WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

NULL, (HMENU)NULL, hInstance, NULL);

ShowWindow(hWnd, nCmdShow);

while (GetMessage(&Message, NULL, 0, 0)) {

TranslateMessage(&Message);

DispatchMessage(&Message);

}

return (int)Message.wParam;

}

#define BSIZE 40

#define BSIZE2 80

LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage, WPARAM wParam, LPARAM lParam)

{

HDC hdc;

PAINTSTRUCT ps;

int i, j;

static int rect[8][4];

static int x, y;

switch (iMessage) {

case WM_CREATE:

x = -50; y = -50;

return 0;

case WM_PAINT:

hdc = BeginPaint(hWnd, &ps);

for (i = 0; i < 8; i++)

for (j = 0; j < 4; j++)

{

Rectangle(hdc, i*BSIZE2, j*BSIZE2, (i + 1)*BSIZE2, (j + 1)*BSIZE2);

if (rect[i][j])

Ellipse(hdc, i*BSIZE2, j*BSIZE2, (i + 1)*BSIZE2, (j + 1)*BSIZE2);

}

EndPaint(hWnd, &ps);

break;

case WM_LBUTTONDOWN:

x = LOWORD(lParam) / BSIZE2;

x = HIWORD(lParam) / BSIZE2;

if (x < 8 && y < 4)

rect[x][y] = 1;

InvalidateRgn(hWnd, NULL, TRUE);

break;

case WM_DESTROY:

PostQuitMessage(0);

return 0;

}

return(DefWindowProc(hWnd, iMessage, wParam, lParam));

}