vc++知识点记录

1：.退出程序
if (MessageBox("Are you sure exit G-Sensor？","Tips",MB_YESNO|MB_DEFBUTTON2)==IDYES)
{
PostQuitMessage(0);
}

2：

.隐藏对话框，最不山寨的一种方法

定义一个bool变量visible，在构造函数中初始化为false

void CGDIButtonTestDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos)
{

//if (lpwndpos->flags & SWP_SHOWWINDOW)
if(!visible)
{
   lpwndpos->flags &= ~SWP_SHOWWINDOW;
   PostMessage(WM_WINDOWPOSCHANGING, 0, (LPARAM)lpwndpos);
   ShowWindow(SW_HIDE);
}
else
   CDialog::OnWindowPosChanging(lpwndpos);
}

在想正常显示的地方visible=true,ShowWindow(SW_SHOW); 即能正常显示。
想正常隐藏，既visible=false,ShowWindow(SW_HIDE);

3：

判断当前键盘指示灯亮着

BYTE MyState[MAX_PATH];
GetKeyboardState((LPBYTE)&MyState);

CString MyInfo="当前亮着的键盘指示灯包括：";
if(MyState[VK_NUMLOCK]&1)
{
MyInfo+="NumLock";
::MessageBox(NULL,"NumLock","信息提示",MB_OK /* MB_ICONINFORMATION|MB_TASKMODAL*/);
}
if(MyState[VK_SCROLL]&1)
{
MyInfo+="、ScrollLock";
::MessageBox(NULL,"ScrollLock","信息提示",MB_OK /* MB_ICONINFORMATION|MB_TASKMODAL*/);
}
if(MyState[VK_CAPITAL]&1)
{
MyInfo+="、CapsLock";
::MessageBox(NULL,"VK_CAPITAL","信息提示",MB_OK /* MB_ICONINFORMATION|MB_TASKMODAL*/);
}
MessageBox(MyInfo,"信息提示",0);

判断当前键盘指示灯亮着

4：类的向导不好用的解决办法

del /F *.ncb
del /F *.opt
del /F *.aps

del /F *.clw

5：添加对话框背景图片

方法一:

void About::OnPaint()
{
CPaintDC dc(this); // device context for painting

// TODO: Add your message handler code here
     CPaintDC   dcc(this);
          CRect   rect;
          GetClientRect(&rect);
          CDC   dcMem;
          dcMem.CreateCompatibleDC(&dc);
          CBitmap   bmpBackground;
          bmpBackground.LoadBitmap(IDB_BITMAP1);
                  //IDB_BITMAP是你自己的图对应的ID
          BITMAP   bitmap;
          bmpBackground.GetBitmap(&bitmap);
          CBitmap   *pbmpOld=dcMem.SelectObject(&bmpBackground);
          dc.StretchBlt(0,0,rect.Width(),rect.Height(),&dcMem,0,0,
         bitmap.bmWidth,bitmap.bmHeight,SRCCOPY);
// Do not call CDialog::OnPaint() for painting messages
}

方法二:

响应OnEraseBkgnd消息，然后在这个消息函数里面显示图片！应该是在APP里加

BOOL CxxDlg::OnEraseBkgnd(CDC* pDC)
{
BITMAP bm;
m_bmp.GetBitmap(&bm);
m_pbmCurrent = &m_bmp;
CDC dcMem;
dcMem.CreateCompatibleDC(pDC);
CBitmap* pOldBitmap = dcMem.SelectObject(m_pbmCurrent);
pDC->BitBlt(0,0,bm.bmWidth,bm.bmHeight,&dcMem,0,0,SRCCOPY);
dcMem.SelectObject(pOldBitmap);
}

方法三：

OnInitDialog()
加入
CBitmap bmp;
bmp.LoadBitmap(IDB_BITMAP3); //这个IDB_BITMAP1要自己添加
m_brush.CreatePatternBrush(&bmp);

OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
中的
return hbr;
替换为：
return (HBRUSH)m_brush;

6：创建非模态对话框

CSplashDlg *pSplashDlg = new CSplashDlg();
pSplashDlg->Create(IDD_SPLASH_DIALOG);
pSplashDlg->ShowWindow(SW_SHOW);
pSplashDlg->UpdateWindow();

7：对话框支持拖动

添加WM_NCHITTEST 消息事件

UINT CMyAgentDlg::OnNcHitTest(CPoint point)
{
// TODO: Add your message handler code here and/or call default
UINT nHitTest=CDialog::OnNcHitTest(point);
return (nHitTest==HTCLIENT)?HTCAPTION:nHitTest;
//return CDialog::OnNcHitTest(point);
}

8：获取屏幕大小

获取屏幕大小
int with= GetSystemMetrics(SM_CXFULLSCREEN);

int heigh= GetSystemMetrics(SM_CYFULLSCREEN);

通过上边两个函数获取的是显示屏幕的大小，及不包括任务栏等区域。

int cx = GetSystemMetrics( SM_CXSCREEN );
int cy = GetSystemMetrics( SM_CYSCREEN );

这两个函数获取的是真正屏幕的大小。

用前两个函数获取的大小可能是1024*687 而用下边两个获取的就是1024*768

9：一个类访问控制另一个类中的变量控件

如果要在类CVDlg 访问控制类CPPDlg中的控件 CSliderCtrl。

首先在类CPPDlg中定义 CSliderCtrl m_sld;

然后在类CVDlg 中定义

CSliderCtrl* m_pSld;
CPPDlg* m_pDlg;

然后在类CVDlg的构造函数中定义：

m_pDlg=new CPPDlg;
m_pDlg->Create(IDD_PP);
m_pSld=&m_pDlg->m_sld;

这样就可以在类CVDlg中任何地方控制类CPPDlg中的控件 CSliderCtrl。

变量，控件都是这么做的。比较正宗的一种方式。

10：Vista下控制屏幕的函数

Vista下如何用软件控制屏幕高层的API可以方便地控制屏幕的亮度、色温、对比度、显示区等。
初始化头文件

#include "PhysicalMonitorEnumerationAPI.h"
#include "HighLevelMonitorConfigurationAPI.h"
#pragma comment(lib,"dxva2.lib")

全局函数（后面的函数都是调用这两个函数）

void FreePhysicalMonitor(DWORD npm, LPPHYSICAL_MONITOR ppm)
{
DestroyPhysicalMonitors(npm, ppm);
// Free the array.
free(ppm);
}

LPPHYSICAL_MONITOR GetPhysicalMonitor(DWORD *pnpm)
{
HMONITOR hMon = NULL;
hMon = MonitorFromWindow(NULL, MONITOR_DEFAULTTOPRIMARY);
LPPHYSICAL_MONITOR ppm = NULL;
DWORD npm = 0;
BOOL bRet = GetNumberOfPhysicalMonitorsFromHMONITOR(hMon, &npm);
if (bRet) {
ppm = (LPPHYSICAL_MONITOR)malloc(npm * sizeof(PHYSICAL_MONITOR));
if (ppm) {
bRet = GetPhysicalMonitorsFromHMONITOR(hMon, npm, ppm);
if (!bRet) {
FreePhysicalMonitor(npm, ppm);
ppm = NULL;
npm = 0;
}
}
}
*pnpm = npm;
return ppm;
}

返回的是PHYSICAL_MONITOR数组，以下示例只是使用了第一个PHYSICAL_MONITOR元素。

1、调整屏幕前我们可以看看显示器支持什么功能
Vista提供的API是GetMonitorCapabilities（在有些显示器上虽然GetMonitorCapabilities调用失败，但仍然可以调整亮度等；在有些显示器上，从GetMonitorCapabilities返回的值看可以支持某些功能，但实际又不能。这些都另当别论）。

LPPHYSICAL_MONITOR ppm = 0;
ppm = GetPhysicalMonitor();
if (ppm) {
DWORD nmc = 0, nct = 0;
GetMonitorCapabilities(ppm->hPhysicalMonitor, &nmc, &nct);
CString str = _T("");
if (nmc & MC_CAPS_BRIGHTNESS) {
str += _T("Support brightness control\n");
}
if (nmc & MC_CAPS_COLOR_TEMPERATURE) {
str += _T("Support color temperature\n");
}
if (nmc & MC_CAPS_CONTRAST) {
str += _T("Support contrast\n");
}
.........
if (str == _T(""))
str = _T("Support None");
MessageBox(str);
FreePhysicalMonitor(npm, ppm);
}

2、如何调整亮度
LPPHYSICAL_MONITOR ppm = 0;
DWORD npm = 0;
ppm = GetPhysicalMonitor(&npm);
if (ppm) {
DWORD nMin = 0, nCur = 0, nMax = 0;
GetMonitorBrightness(ppm->hPhysicalMonitor, &nMin, &nCur, &nMax);
CString str;
str.Format(_T("Min:%d, Cur:%d, Max:%d"), nMin, nCur, nMax);
MessageBox(str);
SetMonitorBrightness(ppm->hPhysicalMonitor, nMin);
Sleep(1000);
SetMonitorBrightness(ppm->hPhysicalMonitor, nMax);
Sleep(1000);
SetMonitorBrightness(ppm->hPhysicalMonitor, nCur);
Sleep(1000);
FreePhysicalMonitor(npm, ppm);
}

3、调色温

LPPHYSICAL_MONITOR ppm = 0;
DWORD npm = 0;
ppm = GetPhysicalMonitor(&npm);
if (ppm) {
SetMonitorRedGreenOrBlueGain(ppm->hPhysicalMonitor, MC_RED_GAIN, 50);
Sleep(500);
SetMonitorRedGreenOrBlueGain(ppm->hPhysicalMonitor, MC_GREEN_GAIN, 49);
Sleep(500);
SetMonitorRedGreenOrBlueGain(ppm->hPhysicalMonitor, MC_BLUE_GAIN, 52);
MessageBox(_T("Set color temperature => Done"));

FreePhysicalMonitor(npm, ppm);
}

4、调对比度

LPPHYSICAL_MONITOR ppm = 0;
DWORD npm = 0;
ppm = GetPhysicalMonitor(&npm);
if (ppm) {
DWORD nMin, nCur, nMax;
GetMonitorContrast(ppm->hPhysicalMonitor, &nMin, &nCur, &nMax);
CString str;
str.Format(_T("Min:%d, Cur:%d, Max:%d"), nMin, nCur, nMax);
MessageBox(str);
SetMonitorContrast(ppm->hPhysicalMonitor, nMin);
Sleep(1000);
SetMonitorContrast(ppm->hPhysicalMonitor, nMax);
Sleep(1000);
SetMonitorContrast(ppm->hPhysicalMonitor, nCur);
Sleep(1000);
FreePhysicalMonitor(npm, ppm);
}

5、查看显示器类型

LPPHYSICAL_MONITOR ppm = 0;
DWORD npm = 0;
ppm = GetPhysicalMonitor(&npm);
if (ppm) {
TCHAR *descs[] = {
_T("Shadow-mask cathode ray tube (CRT)"),
_T("Aperture-grill CRT"),
_T("Thin-film transistor (TFT) display"),
_T("Liquid crystal on silicon (LCOS) display"),
_T("Plasma display"),
_T("Organic light emitting diode (LED) display"),
_T("Electroluminescent display"),
_T("Microelectromechanical display"),
_T("Field emission device (FED) display")
};
MC_DISPLAY_TECHNOLOGY_TYPE dtt;
GetMonitorTechnologyType(ppm->hPhysicalMonitor, &dtt);
CString str;
str.Format(_T("Technology type: %s"), descs[(int)dtt]);
MessageBox(str);
FreePhysicalMonitor(npm, ppm);
}

6、恢复出厂设置

LPPHYSICAL_MONITOR ppm = 0;
DWORD npm = 0;
ppm = GetPhysicalMonitor(&npm);
if (ppm) {
RestoreMonitorFactoryDefaults(ppm->hPhysicalMonitor);
FreePhysicalMonitor(npm, ppm);
}

11：全局函数访问对话框中的控件

CGloabkjDlg *pDlg = (CGloabkjDlg *)(AfxGetApp()->GetMainWnd());

12：

.格盘代码

char   *FormatW2K   =   "CMD.EXE";

//这里我用H:盘，你自己要填入你想格式化的盘
char   *FormatW2KParam   =   "/C   \"format.com   H:/force/q/u/x/V:MISC\"";

//在后台执行格式化命令
ShellExecute(NULL,"open",FormatW2K,FormatW2KParam,NULL,SW_HIDE);

13：系统下关机代码：

    TOKEN_PRIVILEGES tp;
    HANDLE hToken;
    LUID luid;
    LPTSTR MachineName=NULL;
    if(!OpenProcessToken(GetCurrentProcess(),TOKEN_ADJUST_PRIVILEGES,&hToken ))
{
       // PERR("OpenProcessToken",GetLastError());
        return ;
}
    if(!LookupPrivilegeValue(MachineName, SE_SHUTDOWN_NAME, &luid))
{
      // PERR("LookupPrivilegeValue", GetLastError());
        return ;
}
    tp.PrivilegeCount = 1;
    tp.Privileges[0].Luid = luid;
    tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
    AdjustTokenPrivileges(hToken,FALSE,&tp,sizeof(TOKEN_PRIVILEGES),NULL, NULL ); //到这里,是取得权限///
    ExitWindowsEx(EWX_REBOOT,EWX_FORCE);

14：对话框加载工具栏

1.添加成员变量 CToolBar m_WndToolBar

   2.在OnInitDialog() 中 CDialog::OnInitDialog();后添加

   if (!m_WndToolBar.CreateEx(this, TBSTYLE_FLAT,WS_CHILD|WS_VISIBLE|CBRS_ALIGN_TOP|CBRS_GRIPPER|CBRS_TOOLTIPS,CRect(4,4,0,0))||!m_WndToolBar.LoadToolBar(IDR_TOOLBAR1))
{
   TRACE0("未能创建工具栏\n");
   return -1;
}
m_WndToolBar.ShowWindow(SW_SHOW);
RepositionBars(AFX_IDW_CONTROLBAR_FIRST,AFX_IDW_CONTROLBAR_LAST,0);

15：VC如何作出有动画效果的托盘图标

//主程序对话框类构造函数
CCDROMControlDlg::CCDROMControlDlg(CWnd* pParent /*=NULL*/)
: CDialog(CCDROMControlDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CCDROMControlDlg)
m_nIconPos = 0; //托盘区动画图标从m_hIconArray[0]开始显示
//}}AFX_DATA_INIT

m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

//加载托盘区动画图标
m_hIconArray[0] = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_hIconArray[1] = AfxGetApp()->LoadIcon(IDI_ICON1);
m_hIconArray[2] = AfxGetApp()->LoadIcon(IDI_ICON2);
m_hIconArray[3] = AfxGetApp()->LoadIcon(IDI_ICON3);
}

//定时器消息处理函数，用来实现动画图标
void CCDROMControlDlg::OnTimer(UINT nIDEvent)
{
    NOTIFYICONDATA nc;
nc.cbSize = sizeof(NOTIFYICONDATA);
if(m_nIconPos==3)
    m_nIconPos=0;
nc.hIcon = m_hIconArray[m_nIconPos++];
nc.hWnd = m_hWnd;
lstrcpy(nc.szTip,"动画效果托盘图标");
nc.uCallbackMessage = WM_NOTIFYICON;           //自定义最小化托盘消息
nc.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
nc.uID = IDC_NOTIFYICON;
Shell_NotifyIcon(NIM_MODIFY, &nc);
CDialog::OnTimer(nIDEvent);
}

只做这些托盘图标动画不会出来的应该在前面做个 Shell_NotifyIcon(NIM_ADD, &nc);
动画才能出来。