1. api 소스만들기..
마우스 좌클릭시 클릭한곳에 a~z까지 랜덤출력 (중복적용가능해야함)

이렇게 좀부탁드립니다.. 주석으로 간단한 설명까지 해주시면 더 감사합니다.

기본소스코드 들릴게요 ㅠㅠ

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
HINSTANCE g_hinst;
LPCTSTR lpszClass = TEXT("first");
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;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage, WPARAM wParam, LPARAM lParam)
{
switch (iMessage){
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}