네트워크상에서 패킷 전송을 하는 프로그램입니다.

//#include <iostream>
//using namespace std;
#include "getopt.h"
#include <cstdlib>
//#pragma comment(lib, "Ws2_32.lib")
//#include <winsock2.h>
 
#include <windows.h>
 
#pragma comment(lib, "Ws2_32.lib")
//#include <Winsock2.h>
 
 
 
#pragma comment(lib, "Shlwapi.lib")
#include <Shlwapi.h>
//Shlwapi.lib
 
#pragma comment(lib, "Ole32.lib")
#include <Objbase.h>
//Ole32.lib
 
#pragma comment(lib, "User32.lib")
#include <Winuser.h>
//User32.lib
 
#include <cstdio>
TCHAR* ip, *start_port, *end_port;
unsigned int firstip_n, secondip_n, thirdip_n, fourthip_n;
 
HWND hWnd;
 
LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
void CALLBACK TimerProc(HWND, UINT, UINT, DWORD);
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
	//LPCTSTR clsname=TEXT("I am a window.");
	LPWSTR recmdline=GetCommandLine();
	//LPCTSTR clsname=(LPCTSTR)strchr((char*)lpCmdLine, ' ');
 
 
	LPWSTR clsname=recmdline;
 
	/*ip=(LPWSTR)(  StrChr(recmdline, TEXT(' '))		);
		//LPWSTR iip=CharNextW(ip);//
	ip=ip+2;
	start_port=(LPWSTR)(  StrChr(ip, TEXT(' ')) );
	*start_port=0;
	start_port=start_port+1;
	end_port=(LPWSTR)(   StrChr(start_port, TEXT(' '))   );
	*end_port=0;
	end_port=end_port+1;*/
 
 
 
	TCHAR* option=NULL;
	TCHAR* optarg;
	while(  (option=getopt(recmdline, TEXT("-ip -sport -eport"), &optarg))!=NULL  ) {
		if(  StrCmp(option, TEXT("-ip"))==0  ) {
			ip=optarg;
		}
		else if(  StrCmp(option, TEXT("-sport"))==0  ) {
			start_port=optarg;
		}
		else if(  StrCmp(option, TEXT("-eport"))==0  ) {
			end_port=optarg;
		}
	}
 
 
	LPWSTR firstip=ip;
	LPWSTR secondip=(LPWSTR)StrChr(ip, TEXT('.'));
	*secondip=0;
	secondip=secondip+1;
	LPWSTR thirdip=(LPWSTR)StrChr(secondip, TEXT('.'));
	*thirdip=0;
	thirdip=thirdip+1;
	LPWSTR fourthip=(LPWSTR)StrChr(thirdip, TEXT('.'));
	*fourthip=0;
	fourthip=fourthip+1;
	firstip_n=(unsigned int)StrToInt(firstip);
	secondip_n=(unsigned int)StrToInt(secondip);
	thirdip_n=(unsigned int)StrToInt(thirdip);
	fourthip_n=(unsigned int)StrToInt(fourthip);
 
	WNDCLASS WndClass;
	WndClass.lpfnWndProc=WindowProc;
	WndClass.cbClsExtra=0;
	WndClass.cbWndExtra=0;
	WndClass.hCursor=LoadCursor(NULL, IDC_ARROW);//
	WndClass.hIcon=NULL;
	WndClass.hInstance=hInstance;
	WndClass.lpszClassName=clsname;
	WndClass.lpszMenuName=NULL;
	WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);//
	WndClass.style=CS_HREDRAW|CS_VREDRAW;//
	RegisterClass(&WndClass);
 
/*
HWND WINAPI CreateWindow(
  _In_opt_ LPCTSTR   lpClassName,
  _In_opt_ LPCTSTR   lpWindowName,
  _In_     DWORD     dwStyle,
  _In_     int       x,
  _In_     int       y,
  _In_     int       nWidth,
  _In_     int       nHeight,
  _In_opt_ HWND      hWndParent,
  _In_opt_ HMENU     hMenu,
  _In_opt_ HINSTANCE hInstance,
  _In_opt_ LPVOID    lpParam
);
*/
 
 
	hWnd=CreateWindow(clsname, thirdip, WS_OVERLAPPEDWINDOW,0,0,0,0, NULL, NULL, hInstance, NULL);
	ShowWindow(hWnd, SW_HIDE);
 
 
 
 
	MSG Message;
	while(GetMessage(&Message, NULL, 0,0)) {
		TranslateMessage(&Message);
		DispatchMessage(&Message);
	}
 
 
	return (int)Message.wParam;
}
 
 
DWORD WINAPI ThreadFunc(LPVOID temp) {
		//argv[1] ip address
		//argv[2] start port number
		//argv[3] end port number
 
 
 
		SOCKET ConnectSocket;
		sockaddr_in clientService;
		clientService.sin_family=AF_INET;
 
		char arrip[20];
		sprintf_s(arrip,"%d.%d.%d.%d",firstip_n, secondip_n, thirdip_n, fourthip_n);
 
		//clientService.sin_addr.s_addr=inet_addr(arrip);/////////////////solving	
		clientService.sin_addr.S_un.S_addr=inet_addr(arrip);
		unsigned int port;
		unsigned int start_port_n=(unsigned int)StrToInt(start_port);
		port=start_port_n;
		unsigned int end_port_n=(unsigned int)StrToInt(end_port);
		const char* sendbuf="Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day! Beautiful day!";
		while(true) {
			WSADATA wsaData;
			int iResult=WSAStartup(MAKEWORD(2,2),& wsaData);
			if(iResult!=NO_ERROR) {
				//cout<<"Error occured."<<endl;
				MessageBox(hWnd, TEXT("WSAStartup function failed."), NULL, MB_OK);
				WSACleanup();
				return 1;
			}
			ConnectSocket=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
			if(ConnectSocket==INVALID_SOCKET) {
				MessageBox(hWnd, TEXT("socket function failed."), NULL, MB_OK);
				WSACleanup();
				return 1;
			}
 
			clientService.sin_port=htons(port);
			/*iResult=connect(ConnectSocket, (SOCKADDR*)&clientService, sizeof(clientService));
			if(iResult==SOCKET_ERROR) {
				//cout<<"Fail to connect."<<endl;
				WSACleanup();
				return 1;
			}*/
 
			iResult=sendto(ConnectSocket, sendbuf, (int)strlen(sendbuf), 0,(SOCKADDR*)&clientService, sizeof(clientService));
			if(iResult==SOCKET_ERROR) {
				closesocket(ConnectSocket);
				WSACleanup();
				return 1;
			}
 
			port++;
			//cout<<port<<" ";//test
			if(port>=end_port_n) {
				port=start_port_n;
			}
			closesocket(ConnectSocket);
			//Sleep(5);
			WSACleanup();
 
		}
 
	return 0;
}
 
 
LRESULT CALLBACK WindowProc(HWND hwnd, UINT iMessage, WPARAM wParam, LPARAM lParam) {
 
	DWORD ThreadId;
	HANDLE hThread;
 
	switch(iMessage) {
		case WM_CREATE:
			hThread=CreateThread(NULL, 0, ThreadFunc, NULL, 0, &ThreadId);		
 
			//SetTimer(hwnd, 1, 1, TimerProc);
			return true;
		case WM_DESTROY:
			//KillTimer(hwnd, 1);
			CloseHandle(hThread);
			PostQuitMessage(0);
			return 0;
	}
	return (  DefWindowProc(hwnd, iMessage, wParam, lParam)  );
}