关于弹出消息窗口的自动关闭

1.方法1

1.1. 直接在代码中添加

// 弹出消息窗口自动关闭，需要指出的是，Windows 2000的user32.dll没有导出这个函数。
extern "C"
{
int WINAPI MessageBoxTimeoutA(IN HWND hWnd, IN LPCSTR lpText, IN LPCSTR lpCaption, IN UINT uType, IN WORD wLanguageId, IN DWORD dwMilliseconds);
int WINAPI MessageBoxTimeoutW(IN HWND hWnd, IN LPCWSTR lpText, IN LPCWSTR lpCaption, IN UINT uType, IN WORD wLanguageId, IN DWORD dwMilliseconds);
};
#ifdef UNICODE
#define MessageBoxTimeout MessageBoxTimeoutW
#else
#define MessageBoxTimeout MessageBoxTimeoutA
#endif

1.2. 调用

MessageBoxTimeout(this->GetSafeHwnd(), _T("弹出5秒后会自动关闭！这是一个模态对话框。"), _T("会自动关闭的MessageBox"), MB_ICONINFORMATION, GetSystemDefaultLangID(), 5000);
//参数说明：父窗口的句柄为NULL的情况下，将弹出非模态对话框；延时关闭的时间为0的情况下，弹出的MessageBox需要手动关闭
MessageBoxTimeout(NULL, _T("弹出5秒后会自动关闭！这是一个非模态对话框。"), _T("会自动关闭的MessageBox"), MB_ICONINFORMATION, GetSystemDefaultLangID(), 5000);

参考网址：http://blog.sina.com.cn/s/blog_4b0f3b420100mglb.html

win7 x86，vs2013，测试通过

2.方法2

2.1.此api是微软的一个未公开api，在user32.dll中，功能就是弹出一个对话框MessageBox，并定时自动退出。 
下面为头文件，随便取个名字，我取的是MsgBoxTimeout.h 。

#include <windows.h>
#include <tchar.h>

//Functions & other definitions required-->
typedef int (__stdcall *MSGBOXAAPI)(IN HWND hWnd,
IN LPCSTR lpText, IN LPCSTR lpCaption,
IN UINT uType, IN WORD wLanguageId, IN DWORD dwMilliseconds);
typedef int (__stdcall *MSGBOXWAPI)(IN HWND hWnd,
IN LPCWSTR lpText, IN LPCWSTR lpCaption,
IN UINT uType, IN WORD wLanguageId, IN DWORD dwMilliseconds);

int MessageBoxTimeoutA(IN HWND hWnd, IN LPCSTR lpText,
IN LPCSTR lpCaption, IN UINT uType,
IN WORD wLanguageId, IN DWORD dwMilliseconds);
int MessageBoxTimeoutW(IN HWND hWnd, IN LPCWSTR lpText,
IN LPCWSTR lpCaption, IN UINT uType,
IN WORD wLanguageId, IN DWORD dwMilliseconds);

#ifdef UNICODE
#define MessageBoxTimeout MessageBoxTimeoutW
#else
#define MessageBoxTimeout MessageBoxTimeoutA
#endif

#define MB_TIMEDOUT 32000

int MessageBoxTimeoutA(HWND hWnd, LPCSTR lpText,
LPCSTR lpCaption, UINT uType, WORD wLanguageId,
DWORD dwMilliseconds)
{
static MSGBOXAAPI MsgBoxTOA = NULL;

if (!MsgBoxTOA)
{
HMODULE hUser32 = GetModuleHandle(_T("user32.dll"));
if (hUser32)
{
MsgBoxTOA = (MSGBOXAAPI)GetProcAddress(hUser32,
"MessageBoxTimeoutA");
//fall through to 'if (MsgBoxTOA)...'
}
else
{
//stuff happened, add code to handle it here
//(possibly just call MessageBox())
return 0;
}
}

if (MsgBoxTOA)
{
return MsgBoxTOA(hWnd, lpText, lpCaption,
uType, wLanguageId, dwMilliseconds);
}

return 0;
}

int MessageBoxTimeoutW(HWND hWnd, LPCWSTR lpText,
LPCWSTR lpCaption, UINT uType, WORD wLanguageId, DWORD dwMilliseconds)
{
static MSGBOXWAPI MsgBoxTOW = NULL;

if (!MsgBoxTOW)
{
HMODULE hUser32 = GetModuleHandle(_T("user32.dll"));
if (hUser32)
{
MsgBoxTOW = (MSGBOXWAPI)GetProcAddress(hUser32,
"MessageBoxTimeoutW");
//fall through to 'if (MsgBoxTOW)...'
}
else
{
//stuff happened, add code to handle it here
//(possibly just call MessageBox())
return 0;
}
}

if (MsgBoxTOW)
{
return MsgBoxTOW(hWnd, lpText, lpCaption,
uType, wLanguageId, dwMilliseconds);
}

return 0;
}
//End required definitions <--

2.2. 调用方式

#include "MsgBoxTimeout.h"
void CTestDlg::OnBnClickedButton2()
{
//you must load user32.dll before calling the function
HMODULE hUser32 = LoadLibrary(_T("user32.dll"));

if (hUser32)
{
int iRet = 0;
UINT uiFlags = MB_OK | MB_SETFOREGROUND | MB_SYSTEMMODAL | MB_ICONINFORMATION;

iRet = MessageBoxTimeout(NULL, _T("Test a timeout of 2 seconds."),
_T("MessageBoxTimeout Test"), uiFlags, 0, 2000);
//iRet will = 1

uiFlags = MB_YESNO | MB_SETFOREGROUND | MB_SYSTEMMODAL | MB_ICONINFORMATION;

iRet = MessageBoxTimeout(NULL, _T("Test a timeout of 5 seconds."),
_T("MessageBoxTimeout Test"), uiFlags, 0, 5000);
//iRet will = MB_TIMEDOUT if no buttons pressed, button values otherwise

//only unload user32.dll when you have no further need
//for the MessageBoxTimeout function
FreeLibrary(hUser32);
}
}

参考网址：http://blog.csdn.net/a379039233/article/details/49445207