20个VC开发小技巧(1)

//一、打开CD-ROM

mciSendString("Set cdAudio door open wait",NULL,0,NULL);

//二、关闭CD_ROM

mciSendString("Set cdAudio door closed wait",NULL,0,NULL);

//三、关闭计算机

OSVERSIONINFO OsVersionInfo; //包含操作系统版本信息的数据结构
OsVersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&OsVersionInfo); //获取操作系统版本信息
if(OsVersionInfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
{
    //Windows98,调用ExitWindowsEx()函数重新启动计算机
    DWORD dwReserved;
    ExitWindowsEx(EWX_REBOOT,dwReserved); //可以改变第一个参数，实现注销用户、
    //关机、关闭电源等操作
    // 退出前的一些处理程序
}

//四、重启计算机

typedef int (CALLBACK *SHUTDOWNDLG)(int); //显示关机对话框函数的指针
HINSTANCE hInst = LoadLibrary("shell32.dll"); //装入shell32.dll
SHUTDOWNDLG ShutDownDialog; //指向shell32.dll库中显示关机对话框函数的指针
if(hInst != NULL)
{
    //获得函数的地址并调用之
    ShutDownDialog = (SHUTDOWNDLG)GetProcAddress(hInst,(LPSTR)60);
    
    (*ShutDownDialog)(0);
}

//五、枚举所有字体

LOGFONT lf;
lf.lfCharSet = DEFAULT_CHARSET; // Initialize the LOGFONT structure
strcpy(lf.lfFaceName,"");
CClientDC dc (this);
// Enumerate the font families
::EnumFontFamiliesEx((HDC) dc,&lf, (FONTENUMPROC) EnumFontFamProc,(LPARAM) this,0);
//枚举函数
int CALLBACK EnumFontFamProc(LPENUMLOGFONT lpelf,
                             LPNEWTEXTMETRIC lpntm,DWORD nFontType,long lparam)
                             
{
    // Create a pointer to the dialog window
    CDay7Dlg* pWnd = (CDay7Dlg*) lparam;
    // add the font name to the list box
    pWnd ->m_ctlFontList.AddString(lpelf ->elfLogFont.lfFaceName);
    // Return 1 to continue font enumeration
    return 1;
}

//其中m_ctlFontList是一个列表控件变量

//六、一次只运行一个程序实例，如果已运行则退出

if( FindWindow(NULL,"程序标题")) exit(0);

//七、得到当前鼠标所在位置

CPoint pt;
GetCursorPos(&pt); //得到位置

//八、上下文菜单事件触发事件：OnContextMenu事件

//九、显示和隐藏程序菜单

CWnd *pWnd=AfxGetMainWnd();
if(b_m) //隐藏菜单
{
    pWnd->SetMenu(NULL);
    pWnd->DrawMenuBar();
    b_m=false;
}
else
{
    CMenu menu;
    menu.LoadMenu(IDR_MAINFRAME); ////显示菜单 也可改变菜单项
    pWnd->SetMenu(&menu);
    pWnd->DrawMenuBar();
    b_m=true;
    menu.Detach();
}

//十、获取可执行文件的图标

HICON hIcon=::ExtractIcon(AfxGetInstanceHandle(),_T("NotePad.exe"),0);
if (hIcon &&hIcon!=(HICON)-1)
{
    pDC->DrawIcon(10,10,hIcon);
    
}

DestroyIcon(hIcon);