Running console applications silently

// RunSilent.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <io.h>
#include <stdio.h>

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];								// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];								// The title bar text
BOOL bIPRun;

// Foward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);
DWORD				RunSilent(char* strFunct, char* strstrParams);
LRESULT CALLBACK    RunIP(HWND, UINT, WPARAM, LPARAM);
void				DrawIPConfigText(HDC, RECT*);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_RUNSILENT, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow)) 
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_RUNSILENT);

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX); 

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= (WNDPROC)WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_RUNSILENT);
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= (LPCSTR)IDC_RUNSILENT;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   bIPRun = false;
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	TCHAR szHello[MAX_LOADSTRING];
	LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);
	HWND wnddlg;

	switch (message) 
	{
		case WM_COMMAND:
			wmId    = LOWORD(wParam); 
			wmEvent = HIWORD(wParam); 
			// Parse the menu selections:
			switch (wmId)
			{
				case ID_FILE_RUNIPCONFIG:
					wnddlg = CreateDialog(hInst, (LPCTSTR)IDD_DIALOG1, hWnd, (DLGPROC)RunIP);
									
					break;
				case IDM_ABOUT:
				   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
				   break;
				case IDM_EXIT:
				   DestroyWindow(hWnd);
				   break;
				default:
				   return DefWindowProc(hWnd, message, wParam, lParam);
			}
			break;
		case WM_PAINT:
			hdc = BeginPaint(hWnd, &ps);
			// TODO: Add any drawing code here...
			RECT rt;
			GetClientRect(hWnd, &rt);
			DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
			if(bIPRun)
				DrawIPConfigText(hdc, &rt);
			EndPaint(hWnd, &ps);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
			{
				EndDialog(hDlg, LOWORD(wParam));
				return TRUE;
			}
			break;
	}
    return FALSE;
}

LRESULT CALLBACK RunIP(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			switch(LOWORD(wParam)){
				case IDOK :
					RunSilent("IPConfig.exe", ">> C:\\\\RunSilent.txt");
					bIPRun = true;					
				case IDCANCEL:
					DestroyWindow(hDlg);
					
					InvalidateRect(GetParent(hDlg), NULL, FALSE);
					return TRUE;
			}
			break;
	}
    return FALSE;
}

DWORD RunSilent(char* strFunct, char* strstrParams)
{
	STARTUPINFO StartupInfo;
	PROCESS_INFORMATION ProcessInfo;
	char Args[4096];
	char *pEnvCMD = NULL;
	char *pDefaultCMD = "CMD.EXE";
	ULONG rc;
	
	memset(&StartupInfo, 0, sizeof(StartupInfo));
	StartupInfo.cb = sizeof(STARTUPINFO);
	StartupInfo.dwFlags = STARTF_USESHOWWINDOW;
	StartupInfo.wShowWindow = SW_HIDE;

	Args[0] = 0;

	pEnvCMD = getenv("COMSPEC");

	if(pEnvCMD){
		
		strcpy(Args, pEnvCMD);
	}
	else{
		strcpy(Args, pDefaultCMD);
	}

	// "/c" option - Do the command then terminate the command window
	strcat(Args, " /c "); 
	//the application you would like to run from the command window
	strcat(Args, strFunct);  
	strcat(Args, " "); 
	//the parameters passed to the application being run from the command window.
	strcat(Args, strstrParams); 

	if (!CreateProcess( NULL, Args, NULL, NULL, FALSE,
		CREATE_NEW_CONSOLE, 
		NULL, 
		NULL,
		&StartupInfo,
		&ProcessInfo))
	{
		return GetLastError();		
	}

	WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
	if(!GetExitCodeProcess(ProcessInfo.hProcess, &rc))
		rc = 0;

	CloseHandle(ProcessInfo.hThread);
	CloseHandle(ProcessInfo.hProcess);

	return rc;
	
}

void DrawIPConfigText(HDC hdc, RECT* rect){
	int fh1;
	
	// open the file just created
	fh1 = _open("C:\\\\runsilent.txt", _O_RDONLY | _O_TEXT);
	if( fh1 == -1 ){
		perror( "open failed on input file" );
		return;
	}

	// read the contents of the file
	long pos = _lseek(fh1, 0L, SEEK_END);
	if(pos == -1L){
		perror("read end failed on IP text file");
		return;
	}
		
	_lseek(fh1, 0L, SEEK_SET);
	
	size_t fsiz = pos;
	char* pszbuff = (char*) malloc(fsiz);

	long lbytes = _read(fh1, pszbuff, pos);
	if(lbytes <= 0){
		perror("read data failed on IP text file");
		return;
	}
	
	DrawText(hdc, pszbuff, strlen(pszbuff), rect, DT_LEFT);
	return;
	
}