为ximea相机调用xiCam.OpenDevice（）会引发异常“无效句柄”

Question

我正在尝试通过C＃应用程序控制Ximea相机（http://www.ximea.com）。

我以公司随相机提供的示例为例。每次我想连接相机（使用OpenDevice函数）时，都会收到一条错误消息-“无效的手柄”。这是什么意思，我该怎么解决？

代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Drawing;
using xiApi.NET;
namespace xiApi.NET_example
{
class Program
{
 static void Main(string[] args){
 {
  xiCam myCam = new xiCam();
  try
  {
  // Initialize first camera
  myCam.OpenDevice(0);

  // Set device exposure to 2 milliseconds
  int exposure_us = 2000;
  myCam.SetParam(PRM.EXPOSURE, exposure_us);

  // Set device gain to 5 decibels
  float gain_db = 5;
  myCam.SetParam(PRM.GAIN, gain_db);

  // Set image output format to monochrome 8 bit
  myCam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8);

  //Start acquisition
  myCam.StartAcquisition();

  // Capture images
  Bitmap myImage;
  int timeout = 1000;
  for (int i = 0; i < 10; i++)
  {
    myCam.GetImage(out myImage, timeout );
    string fName = string.Format("image{0}.bmp", i);
    myImage.Save(fName);
  }
  // Stop acquisition
  myCam.StopAcquisition();
}

catch (System.ApplicationException appExc)
{
  // Show handled error
  Console.WriteLine(appExc.Message);
  System.Console.ReadLine();
  myCam.CloseDevice();
}

finally
{
  myCam.CloseDevice();
}