How to minimize to the systray and not to the taskbar?

Any idea?

Here's the code for a small backup utility that I wrote at work.
You're free to use it however you like. Unfortunately since it was
such a small app I wrote in a hurry, I didn't comment it <-I know,
I know, no excuse :) but the billing department needed a quick
fix, I was on a time crunch *honest* :)

I've added a few comments here to signify the unique
code for the system tray functionality. But if you have any
questions feel free to ask and when I get more time (I'm at work
now) I'll check back and answer them.

Code:

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>
#include <shellapi.h>  //<-this is needed for a systray app
#include <string>
using namespace std;

#define ID_TASKBARICON 100  //<-systray app
#define WM_ICONNOTIFY (WM_USER + 101) //<-systray app

HWND hWnd=NULL;
HINSTANCE hInst=NULL;
HANDLE hFile=NULL;
string sFiles[4], sLocalPath, sLocalFile, sServerPath, sServerFile;
bool bBackup;
FILETIME ftC, ftA, ftW; //created, accessed and written file times
SYSTEMTIME stCur, stFile; //current and file system times
DWORD dwLast;
int i;
NOTIFYICONDATA nid; //<-systray app

HWND hBtnMin=NULL, hBtnBkup=NULL, hBtnExit=NULL;

void InitVars();
void MidnightRollover();
bool BackupFiles();
void MainLoop();

LRESULT CALLBACK MsgHndlr(HWND hwnd, UINT umsg, WPARAM wparam, LPARAM lparam)
{
	switch(umsg)
	{
	case WM_DESTROY:
		{
			PostQuitMessage(0);
			return(0);
		}break;	
	case WM_ICONNOTIFY: //<-systray app msg
		{
			switch(lparam)
			{
			case WM_LBUTTONDBLCLK:
				{
					ShowWindow(hWnd,SW_RESTORE);
				}break;
			}
			return(0);
		}break;	
	case WM_LBUTTONDOWN:
		{
			BackupFiles();
			bBackup=false;
			return(0);
		}break;
	case WM_COMMAND:
		{
			if((HWND)lparam==hBtnMin)
			{
				ShowWindow(hWnd,SW_HIDE);
				return(0);
			}
			if((HWND)lparam==hBtnExit)
			{
				DestroyWindow(hWnd);
				return(0);
			}
		}break;
	case WM_CREATE:
		{
			hBtnMin=CreateWindowEx(0,"Button","Minimize",WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON,150,5,100,30,hwnd,NULL,hInst,NULL);
			hBtnExit=CreateWindowEx(0,"Button","Exit",WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,260,5,50,30,hwnd,NULL,hInst,NULL);
			return(0);
		}break;
	}
	return(DefWindowProc(hwnd,umsg,wparam,lparam));
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	hInst=hInstance;
	WNDCLASSEX wcx;
	wcx.cbSize=sizeof(WNDCLASSEX);
	wcx.style=CS_OWNDC | CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
	wcx.lpfnWndProc=MsgHndlr;
	wcx.cbClsExtra=0;
	wcx.cbWndExtra=0;
	wcx.hInstance=hInst;
	wcx.hIcon=LoadIcon(NULL, IDI_APPLICATION);
	wcx.hCursor=LoadCursor(NULL, IDC_ARROW);
	wcx.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
	wcx.lpszMenuName=NULL;
	wcx.lpszClassName="WindowClass";
	wcx.hIconSm=NULL;
	if(!RegisterClassEx(&wcx)) return(0);
	hWnd=CreateWindowEx(0,"WindowClass","Tidewater Billing Backup",WS_CAPTION,
		GetSystemMetrics(SM_CXSCREEN)/2-210,GetSystemMetrics(SM_CYSCREEN)/2-40,420,80,
		NULL,NULL,hInst,NULL);
	if(!hWnd) return(0);
	InitVars();
	MSG msg;
	for(;;)
	{
		if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))
		{
			if(msg.message==WM_QUIT) break;
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
		MainLoop();
	}
	Shell_NotifyIcon(NIM_DELETE,&nid); //<-systray app
	return(msg.wParam);
}

void InitVars()
{
	sLocalPath="C:\\IMATEBKUP\\";
	sServerPath="V:\\IMATEBKUP\\";
	sFiles[0]="IMATEBKUP1100";
	sFiles[1]="IMATEBKUP1200";
	sFiles[2]="IMATEBKUP3100";
	sFiles[3]="IMATEBKUP3800";
	dwLast=0;
	bBackup=false;
	GetLocalTime(&stFile);	

                //systray app ->
	nid.cbSize=sizeof(NOTIFYICONDATA);
	nid.hWnd=hWnd;
	nid.uID=ID_TASKBARICON;
	nid.uFlags=NIF_ICON | NIF_MESSAGE | NIF_TIP;
	nid.uCallbackMessage=WM_ICONNOTIFY;
	nid.hIcon=LoadIcon(NULL,IDI_APPLICATION);
	strcpy(nid.szTip,"tooltip");
	Shell_NotifyIcon(NIM_ADD,&nid);
                //<- systray app
}

void MidnightRollover()
{
	GetLocalTime(&stCur);
	if((stCur.wHour==0)&&(stCur.wMinute>=30))
	{
		bBackup=false;
	}
}

void MainLoop()
{
	if((timeGetTime()-dwLast)>=900000)
	{
		dwLast=timeGetTime();
		MidnightRollover();
		if(!bBackup)			
		{
			GetLocalTime(&stCur);
			if((stCur.wHour==20)&&(stCur.wMinute>=5))
			{
				if(BackupFiles()) bBackup=true;				
			}
		}					
	}
}

bool BackupFiles()
{	
	for(i=0;i<4;i++)
	{
		sLocalFile=sLocalPath;
		sLocalFile+=sFiles[i];
		sServerFile=sServerPath;
		sServerFile+=sFiles[i];
		CopyFile(sLocalFile.c_str(),sServerFile.c_str(),0);
	}
	return(true);
}

Very cool I have just implemented that on my code and the Icon shows on my tray every time i open my app, and when i hit the minimize button the app disappears.

The problems right now are:

1)It disappears forever When i pass my mouse over the tray icon (no need to click it) the icon disappears.

2)I can´t find my app using alt+tab and she´s not at the taskbar either hehehe. So the only solution is ctrl+alt+del :\


But thanks a lot for the help, i´m sure eventually i´ll find a way.
If you have any idea what that could be, i´d be happy to hear!

Problem solved, it was stupid syntax stuff