利用LabWindows/CVI控制显示器的开启与关闭

CVI, LabWindows, 显示器

本例子举例说明了在LabWindows/CVI中调用SDK函数过程中使用两种方式获得调用句柄。在LabWindows/CVI句柄的数据类型为整型，而在Windows中，句柄的类型通常为HWND类型，这就需要在使用过程中进行强制转换。

　　如果想在电脑运行时关闭显示器节电，那么可以用如下程序。

　　程序界面：

　　程序代码：

#include "windows.h"
#include
#include
#include "显示器操作.h"

static int panelHandle;

int __stdcall WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                       LPSTR lpszCmdLine, int nCmdShow)
{
if (InitCVIRTE (hInstance, 0, 0) == 0)
  return -1; /* out of memory */
if ((panelHandle = LoadPanel (0, "显示器操作.uir", PANEL)) < 0)
  return -1;
DisplayPanel (panelHandle);
RunUserInterface ();
DiscardPanel (panelHandle);
return 0;
}

int CVICALLBACK QuitCallback (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
  case EVENT_COMMIT:
   QuitUserInterface (0);
   break;
}
return 0;
}

//关闭按钮
int CVICALLBACK off (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
int handle;
switch (event)
{
  case EVENT_COMMIT:

   //获得面板句柄
   GetPanelAttribute (panelHandle, ATTR_SYSTEM_WINDOW_HANDLE, &handle);

   //关闭显示器
   SendMessage((HWND)handle, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
   break;
}
return 0;
}

//开启按钮
int CVICALLBACK on (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
int handle;
switch (event)
{
  case EVENT_COMMIT:

   //获得CVI窗口句柄
   handle = GetCVIWindowHandle();

   //打开显示器
   SendMessage((HWND)handle, WM_SYSCOMMAND, SC_MONITORPOWER, -1);
   break;
}
return 0;
}

转自：小信的博客

网址：http://blog.sina.com.cn/u/1265070197