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 :)