Win7 taskbar state class

[Bulat Ziganshin]

Just found this nice class allowing to set progress/status of taskbar in Vista+. I've also attached prebuilt app that demonstrates class usage and may be useful for batches

[Bulat Ziganshin]

finally i've structured it in the following way:

// Include Vista-specific defines unless on GCC3
#if !defined(__GNUC__) || __GNUC__>=4
#include <ShObjIdl.h>
#define FREEARC_WIN_VISTA
#endif

...............

/******************************************************************************
** Windows7+ taskbar progress indication *****************************************
******************************************************************************/


#ifdef FREEARC_WIN_VISTA


class Win7TaskbarProgress
{
private:
    ITaskbarList3* m_pITaskBarList3;
    bool m_bFailed, local;
    HWND hWnd;


    bool Init()
    {
        if (m_pITaskBarList3)
            return true;


        if (m_bFailed)
            return false;


        hWnd = GetConsoleWindow();
        local = false;


        // Initialize COM for this thread...
        CoInitialize(NULL);


        CoCreateInstance(CLSID_TaskbarList, NULL, CLSCTX_INPROC_SERVER, IID_ITaskbarList3, (void **)&m_pITaskBarList3);


        if (m_pITaskBarList3)
            return true;


        m_bFailed = true;
        CoUninitialize();
        return false;
    }


public:
    Win7TaskbarProgress()
    {
        m_pITaskBarList3 = NULL;
        m_bFailed = false;
    }


    virtual ~Win7TaskbarProgress()
    {
        if (local)
          SetProgressState(TBPF_NOPROGRESS);


        if (m_pITaskBarList3)
        {
            m_pITaskBarList3->Release();
            CoUninitialize();
        }
    }


    void SetProgressState(TBPFLAG flag)
    {
        SetProgressState(hWnd, flag);
    }


    void SetProgressState(HWND hwnd, TBPFLAG flag)
    {
        if (Init())
            m_pITaskBarList3->SetProgressState(hwnd, flag);
    }


    void SetProgressValue(ULONGLONG ullCompleted, ULONGLONG ullTotal)
    {
        local = true;
        SetProgressValue(hWnd, ullCompleted, ullTotal);
    }


    void SetProgressValue(HWND hwnd, ULONGLONG ullCompleted, ULONGLONG ullTotal)
    {
        if (Init())
            m_pITaskBarList3->SetProgressValue(hwnd, ullCompleted, ullTotal);
    }
};


#else


struct Win7TaskbarProgress
{
    void SetProgressValue (uint64 ullCompleted, uint64 ullTotal) {}
};
#endif

usage example for console program (indicator automatically removed by the Win7TaskbarProgress destructor):

  Win7TaskbarProgress win7taskbar;
  for (int i=0; i<100; i++)
            win7taskbar.SetProgressValue (i, 100);

in the GUI program, you shoul additionally pass handle of GUI window and manually remove the indicator:

  Win7TaskbarProgress win7taskbar;
  for (int i=0; i<100; i++)
            win7taskbar.SetProgressValue (hWnd, i, 100);
  SetProgressState(hWnd, TBPF_NOPROGRESS);