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);
	}
}