判断窗口是否置顶

    bool isWndTopMost(HWND hwnd) {
        return GetWindowLong(hwnd, GWL_EXSTYLE) & WS_EX_TOPMOST;
    }

设置和取消置顶

    void showWndTopMost(HWND hwnd){
        RECT rect;
        GetWindowRect(hwnd, &rect);
        SetWindowPos(hwnd, HWND_TOPMOST, rect.left, rect.top, abs(rect.right - rect.left), abs(rect.bottom - rect.top), SWP_SHOWWINDOW);
    }
    void cancelTopMost(HWND hwnd){
        RECT rect;
        GetWindowRect(hwnd, &rect);
        SetWindowPos(hwnd, HWND_NOTOPMOST, rect.left, rect.top, abs(rect.right - rect.left), abs(rect.bottom - rect.top), SWP_SHOWWINDOW);
    }

设置窗口前景

    void showWndTop(HWND hWnd){
        if (!::IsWindow(hWnd))
            return;
        if (!::SetForegroundWindow(hWnd)) {
            WinParameter winParameter;
            ::SetForegroundWindow(hWnd)
        }
    }

WinParameter是为了解决某些特殊情况下设置失败的问题

#ifndef WINPARAMETER_H
#define WINPARAMETER_H

class WinParameter 
{
public:
    WinParameter();
    ~WinParameter();

private:
    unsigned long  m_lockTimeOut;
};

#endif // WINPARAMETER_H

///////////////////////////////////////////////////////
#include "winparameter.h"
#include <windows.h>
WinParameter::WinParameter()
{
    m_lockTimeOut = 0;
    HWND  hCurrWnd = ::GetForegroundWindow();
    unsigned long dwThisTID = ::GetCurrentThreadId();
    unsigned long dwCurrTID = ::GetWindowThreadProcessId(hCurrWnd,0);

    //we need to bypass some limitations from Microsoft :)
    if(dwThisTID != dwCurrTID)
    {
        ::AttachThreadInput(dwThisTID, dwCurrTID, TRUE);

        ::SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT,0,&m_lockTimeOut,0);

        ::SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT,0,0,SPIF_SENDWININICHANGE | SPIF_UPDATEINIFILE);
        ::AllowSetForegroundWindow(ASFW_ANY);
    }

}

WinParameter::~WinParameter()
{
    HWND  hCurrWnd = ::GetForegroundWindow();
    unsigned long dwThisTID = ::GetCurrentThreadId();
    unsigned long dwCurrTID = ::GetWindowThreadProcessId(hCurrWnd,0);
    if(dwThisTID != dwCurrTID)
    {

        ::SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT,0,(PVOID)m_lockTimeOut,SPIF_SENDWININICHANGE | SPIF_UPDATEINIFILE);

        ::AttachThreadInput(dwThisTID, dwCurrTID, FALSE);
    }
}

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