是否有一個c/c + +多監視器庫用於更改XP的雙視圖或克隆的桌面設置？

Question

我正在編寫一個應用程序，它可以自動切換在Windows XP桌面的雙視圖或克隆之間切換。該應用程序使用GUI的小wxWidgets窗口。在圖形用戶界面中有一個按鈕可以很容易地在雙視圖和克隆之間進行切換。

是否有一個c/C++庫，可以訪問控制雙視圖或克隆？

Answer 1

以下代碼種類的作品。它不保持顯示器分辨率。

void AppFrame::OnButtonModify(wxCommandEvent& event) 
{ 
    static bool bSwitch = false; 

    if (bSwitch) 
    { 
    ExtendExternalDisplay(); 
    } 
    else 
    { 
    CloneExternalDisplay(); 
    } 
    bSwitch = !bSwitch; 
} 

void AppFrame::ExtendExternalDisplay() 
{ 

    int nModeSwitch = NULL; 
    DEVMODE dmPrimary, dmSecondary, dmThird, savedmSecondary; 

#define szPrimaryDisplay TEXT("\\\\.\\DISPLAY1") 
#define szSecondaryDisplay TEXT("\\\\.\\DISPLAY2") 
#define szThirdDisplay TEXT("\\\\.\\DISPLAY3") 

    ZeroMemory(&dmPrimary, sizeof(dmPrimary)); 
    dmPrimary.dmSize = sizeof(dmPrimary); 
    ZeroMemory(&dmSecondary, sizeof(dmSecondary)); 
    dmSecondary.dmSize = sizeof(dmSecondary); 
    ZeroMemory(&dmThird, sizeof(dmThird)); 
    dmThird.dmSize = sizeof(dmThird); 
    ZeroMemory(&dmThird, sizeof(dmThird)); 
    dmThird.dmSize = sizeof(dmThird); 

    BOOL result; 
    HDC handle; 
    DWORD iDevNum = 0; 
    DWORD dwFlags = 0; 
    DISPLAY_DEVICE lpDisplayDevice, lpDisplayDeviceOne, lpDisplayDeviceTwo;  
    ZeroMemory(&lpDisplayDevice, sizeof(lpDisplayDevice));  
    ZeroMemory(&lpDisplayDeviceOne, sizeof(lpDisplayDeviceOne)); 
    ZeroMemory(&lpDisplayDeviceTwo, sizeof(lpDisplayDeviceTwo)); 
    lpDisplayDevice.cb = sizeof(lpDisplayDevice); 
    lpDisplayDeviceOne.cb = sizeof(lpDisplayDeviceOne); 
    lpDisplayDeviceTwo.cb = sizeof(lpDisplayDeviceTwo); 

    // All this does is confirm the number of display devices the graphics board is capable of handling 
    while(EnumDisplayDevices(NULL, iDevNum, &lpDisplayDevice, dwFlags)) 
    { 
    if (iDevNum == 0) 
    { 
     lpDisplayDeviceOne = lpDisplayDevice; 
     TRACE("DeviceName: '%s'\n", lpDisplayDeviceOne.DeviceName); 
     TRACE("DeviceString: '%s'\n", lpDisplayDeviceOne.DeviceString); 
     TRACE("Flags:  %08X %s%s\n", lpDisplayDeviceOne.StateFlags,((lpDisplayDeviceOne.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) ? "Desktop " : ""), ((lpDisplayDeviceOne.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) ? "Primary" : "")); 
    } 

    if (iDevNum == 1) 
    { 
     lpDisplayDeviceTwo = lpDisplayDevice; 
     TRACE("DeviceName: '%s'\n", lpDisplayDeviceTwo.DeviceName); 
     TRACE("DeviceString: '%s'\n", lpDisplayDeviceTwo.DeviceString); 
     TRACE("Flags:  %08X %s%s\n", lpDisplayDeviceTwo.StateFlags,((lpDisplayDeviceTwo.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) ? "Desktop " : ""), ((lpDisplayDeviceTwo.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) ? "Primary" : "")); 
    } 

    iDevNum ++; 
    } 

    // load DISPLAY1 monitor information // ENUM_CURRENT_SETTINGS  
    if (!EnumDisplaySettings(szPrimaryDisplay, ENUM_REGISTRY_SETTINGS, (DEVMODE*)&dmPrimary)) 
    { 
    TRACE("EnumDisplaySettings unable to enumerate primary display\n"); 
    return; 
    } 

    if (!EnumDisplaySettings(szSecondaryDisplay, ENUM_REGISTRY_SETTINGS, (DEVMODE*)&dmSecondary)) 
    TRACE("EnumDisplaySettings unable to enumerate secondary display display\n"); 

    // these don't enumerate in clone mode 
    if (!EnumDisplaySettings(szSecondaryDisplay, ENUM_CURRENT_SETTINGS, (DEVMODE*)&savedmSecondary)) 
    TRACE("EnumDisplaySettings unable to enumerate secondary display using ENUM_CURRENT_SETTINGS settings\n"); 

    // disable a display, doesn't work 
    // nModeSwitch = ChangeDisplaySettingsEx (szSecondaryDisplay, NULL, NULL, NULL, NULL); 
    // CDdx::ErrorDisplayDevice(nModeSwitch);      // test and TRACE result 

    dmPrimary.dmFields = DM_POSITION; 
    dmPrimary.dmPosition.x = 0;   // set DISPLAY1 as the primary display 
    dmPrimary.dmPosition.y = 0;   // set DISPLAY1 as the primary display 

    // set DISPLAY1 as primary display (dmPosition.x = 0) 
    nModeSwitch = ChangeDisplaySettingsEx (szPrimaryDisplay, (DEVMODE*)&dmPrimary, NULL, (CDS_UPDATEREGISTRY | CDS_NORESET), NULL); 
// CDdx::ErrorDisplayDevice(nModeSwitch);      // test and TRACE result 

    // despite the other lines of code this next line is neccesary to wake the video projector 
    dmSecondary = dmPrimary; 

    dmSecondary.dmFields = DM_POSITION | DM_PELSWIDTH | DM_PELSHEIGHT; 
    dmSecondary.dmPosition.x = dmPrimary.dmPelsWidth + 1; 
    dmSecondary.dmPosition.y = 0; 
    dmSecondary.dmPelsWidth = dmPrimary.dmPelsWidth;   // resize the primary display to match the secondary display 
    dmSecondary.dmPelsHeight = dmPrimary.dmPelsHeight;   // resize the primary display to match the secondary display  

    nModeSwitch = ChangeDisplaySettingsEx (szSecondaryDisplay, (DEVMODE*)&dmSecondary, NULL, (CDS_UPDATEREGISTRY | CDS_NORESET), NULL); 
// CDdx::ErrorDisplayDevice(nModeSwitch);      // test and TRACE result 

    // load DISPLAY3 monitor information 
    if (!EnumDisplaySettings(szThirdDisplay, ENUM_CURRENT_SETTINGS, (DEVMODE*)&dmThird)) 
    { 
    TRACE("EnumDisplaySettings unable to enumerate third display display\n"); 
    } 
    else 
    { 
    dmThird.dmPelsWidth = dmSecondary.dmPelsWidth;    // resize the primary display to match the secondary display 
    dmThird.dmPelsHeight = dmSecondary.dmPelsHeight;   // resize the primary display to match the secondary display  
    dmThird.dmPosition.x = -dmThird.dmPelsWidth;    // set DISPLAY3 as the third display 
    dmPrimary.dmPosition.y = 0;         // set DISPLAY1 as the third display 

    // set DISPLAY3 as third display (-dmThird.dmPelsWidth) 
    nModeSwitch = ChangeDisplaySettingsEx (szThirdDisplay, (DEVMODE*)&dmThird, NULL, (CDS_UPDATEREGISTRY | CDS_NORESET), NULL); 
// CDdx::ErrorDisplayDevice(nModeSwitch);      // test and TRACE result 
    } 

    // really important line makes the whole thing happen 
    nModeSwitch = ChangeDisplaySettingsEx (NULL, NULL, NULL, 0, NULL); 
// CDdx::ErrorDisplayDevice(nModeSwitch);       // test and TRACE result 

} 

void AppFrame::CloneExternalDisplay() 
{ 
    int nModeSwitch = NULL; 
    DEVMODE dmPrimary, dmSecondary, dmThird; 
#define szPrimaryDisplay TEXT("\\\\.\\DISPLAY1") 
#define szSecondaryDisplay TEXT("\\\\.\\DISPLAY2") 
#define szThirdDisplay TEXT("\\\\.\\DISPLAY3") 

    ZeroMemory(&dmPrimary, sizeof(dmPrimary)); 
    dmPrimary.dmSize = sizeof(dmPrimary); 
    ZeroMemory(&dmSecondary, sizeof(dmSecondary)); 
    dmSecondary.dmSize = sizeof(dmSecondary); 
    ZeroMemory(&dmThird, sizeof(dmThird)); 

    // load DISPLAY1 monitor information 
    if (!EnumDisplaySettings(szPrimaryDisplay, ENUM_CURRENT_SETTINGS, (DEVMODE*)&dmPrimary)) 
    { 
    TRACE("EnumDisplaySettings unable to enumerate primary display\n"); 
    return; 
    } 

    if (!EnumDisplaySettingsEx(szSecondaryDisplay, ENUM_REGISTRY_SETTINGS, (DEVMODE*)&dmSecondary, 0)) 
    TRACE("EnumDisplaySettings unable to enumerate secondary display display\n"); 

    dmPrimary.dmFields = DM_POSITION; 
    dmPrimary.dmPosition.x = 0;         // set DISPLAY1 as the primary display 
    dmPrimary.dmPosition.y = 0;         // set DISPLAY1 as the primary display 

    // set DISPLAY1 as primary display (dmPosition.x = 0) 
    nModeSwitch = ChangeDisplaySettingsEx (szPrimaryDisplay, (DEVMODE*)&dmPrimary, NULL, (CDS_UPDATEREGISTRY | CDS_NORESET), NULL); 
// CDdx::ErrorDisplayDevice(nModeSwitch);      // test and TRACE result 

    // this should disable display 
    dmSecondary.dmFields = DM_PELSWIDTH|DM_PELSHEIGHT; 
    dmSecondary.dmPelsWidth = 0; //dmPrimary.dmPelsWidth;   // resize the primary display to match the secondary display 
    dmSecondary.dmPelsHeight = 0;//dmPrimary.dmPelsHeight;   // resize the primary display to match the secondary display  

    // this should clone the display 
    dmSecondary.dmFields |= DM_POSITION; 
    dmSecondary.dmPosition.x = 0;   // set DISPLAY1 as the primary display 
    dmSecondary.dmPosition.y = 0;   // set DISPLAY1 as the primary display 

    nModeSwitch = ChangeDisplaySettingsEx (szSecondaryDisplay, (DEVMODE*)&dmSecondary, NULL, (CDS_UPDATEREGISTRY | CDS_NORESET), NULL); 
// CDdx::ErrorDisplayDevice(nModeSwitch);      // test and TRACE result 

    nModeSwitch = ChangeDisplaySettingsEx (NULL, NULL, NULL, 0, NULL);         // set DISPLAY1 as the primary display 
// CDdx::ErrorDisplayDevice(nModeSwitch);     // test and TRACE result  

} 

Answer 2

退房this script據我所知，它應該啓用或禁用多視圖。雖然它是用腳本語言編寫的，但它可以利用普通的WinAPI函數，所以你應該能夠通過查看它們來了解發生了什麼。

據我所知，通過在第二個顯示器上調用ChangeDisplaySettingsEx並提供寬度，高度，顏色深度和刷新率爲0來實現禁用第二個顯示器。要重新啓用它，可以調用ChangeDisplaySettingsEx據推測第二次使用有效參數。

無論如何，最好嘗試一下腳本（解釋器在主頁上可免費使用）並查看它是否實現了您要查找的功能（請注意，該腳本是針對兩個特定監視器硬編碼的，您將不得不用您的顯示器的名稱替換它們以使其工作）。