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我正在使用luxand Face SDK開發使用Visual Studio的人臉識別應用程序。我正在嘗試修改示例應用程序。在應用程序中，示例被保存在計算機內存中，但我正在嘗試將其寫入文件並稍後從中讀取。代碼摘錄如下。讀取錯誤C＃
該應用程序運行良好，並保存該文件。但是，當它試圖讀取文件時，應用程序停止工作，並且出現錯誤「LiveRecognition_VS2008.exe中發生未處理的異常'System.NullReferenceException'附加信息：未將對象引用設置爲對象實例」在這部分代碼被高亮顯示 「br1.Read（t1.templateData，0，t1.templateData.Length）」
請引導我什麼是錯誤。我正在閱讀文件錯誤？
struct FaceTemplate { // single template
public byte [] templateData;
}
List faceTemplates; // set of face templates (we store 10)
String cameraName;
bool needClose = false;
string userName;
// WinAPI procedure to release HBITMAP handles returned by FSDKCam.GrabFrame
[DllImport("gdi32.dll")]
static extern bool DeleteObject(IntPtr hObject);
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
if (FSDK.FSDKE_OK != FSDK.ActivateLibrary("# snip serial key #"))
{
MessageBox.Show("Please run the License Key Wizard (Start - Luxand - FaceSDK - License Key Wizard)", "Error activating FaceSDK", MessageBoxButtons.OK, MessageBoxIcon.Error);
Application.Exit();
}
FSDK.InitializeLibrary();
FSDKCam.InitializeCapturing();
string [] cameraList;
int count;
FSDKCam.GetCameraList(out cameraList, out count);
if (0 == count) {
MessageBox.Show("Please attach a camera", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Application.Exit();
}
FSDKCam.VideoFormatInfo [] formatList;
FSDKCam.GetVideoFormatList(ref cameraList[0], out formatList, out count);
pictureBox1.Width = formatList[0].Width;
pictureBox1.Height = formatList[0].Height;
this.Width = formatList[0].Width + 48;
this.Height = formatList[0].Height + 116;
cameraName = cameraList[0];
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
needClose = true;
}
private void button1_Click(object sender, EventArgs e)
{
this.button1.Enabled = false;
int cameraHandle = 0;
int r = FSDKCam.OpenVideoCamera(ref cameraName, ref cameraHandle);
if (r != FSDK.FSDKE_OK)
{
MessageBox.Show("Error opening the first camera", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Application.Exit();
}
btnRemember.Enabled = true;
// set realtime face detection parameters
FSDK.SetFaceDetectionParameters(false, false, 100);
FSDK.SetFaceDetectionThreshold(3);
// list where we store face templates
faceTemplates = new List();
while (!needClose)
{
Int32 imageHandle = 0;
if (FSDK.FSDKE_OK != FSDKCam.GrabFrame(cameraHandle, ref imageHandle)) // grab the current frame from the camera
{
Application.DoEvents();
continue;
}
FSDK.CImage image = new FSDK.CImage(imageHandle);
Image frameImage = image.ToCLRImage();
Graphics gr = Graphics.FromImage(frameImage);
FSDK.TFacePosition facePosition = image.DetectFace();
// if a face is detected, we can recognize it
if (facePosition.w != 0)
{
gr.DrawRectangle(Pens.LightGreen, facePosition.xc - facePosition.w/2, facePosition.yc - facePosition.w/2,
facePosition.w, facePosition.w);
// create a new face template
FaceTemplate template = new FaceTemplate();
if (programState == ProgramState.psRemember || programState == ProgramState.psRecognize)
template.templateData = image.GetFaceTemplateInRegion(ref facePosition);
switch (programState)
{
case ProgramState.psNormal: // normal state - do nothing
break;
case ProgramState.psRemember: // Remember Me state - store facial templates
faceTemplates.Add(template);
label1.Text = "Templates stored: " + faceTemplates.Count.ToString();
if (faceTemplates.Count > 0)
{
// get the user name
InputName inputName = new InputName();
inputName.ShowDialog();
userName = inputName.userName;
FileStream fs = File.Open(userName + ".bin", FileMode.Create);
BinaryWriter bw = new BinaryWriter(fs); //Opens a binary writer (writes to file stream)
bw.Write(template.templateData, 0, template.templateData.Length);
bw.Close();
fs.Close();
programState = ProgramState.psRecognize;
}
break;
case ProgramState.psRecognize: // recognize the user
bool match = false;
/*
foreach (FaceTemplate t in faceTemplates)
{
float similarity = 0.0f;
FaceTemplate t1 = t;
FSDK.MatchFaces(ref template.templateData, ref t1.templateData, ref similarity);
float threshold = 0.0f;
FSDK.GetMatchingThresholdAtFAR(0.01f, ref threshold); // set FAR to 1%
if (similarity > threshold)
{
match = true;
break;
}
}
*/
FaceTemplate t1 = new FaceTemplate();
FileStream fs1 = File.Open(userName + ".bin", FileMode.Open,FileAccess.Read);
BinaryReader br1 = new BinaryReader(fs1);
br1.Read(t1.templateData, 0, t1.templateData.Length);
float similarity = 0.0f;
FSDK.MatchFaces(ref template.templateData, ref t1.templateData, ref similarity);
float threshold = 0.0f;
FSDK.GetMatchingThresholdAtFAR(0.01f, ref threshold); // set FAR to 1%
if (similarity > threshold)
{
match = true;
}
if (match)
{
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
gr.DrawString(userName, new System.Drawing.Font("Arial", 16),
new System.Drawing.SolidBrush(System.Drawing.Color.LightGreen),
facePosition.xc, facePosition.yc + facePosition.w * 0.55f, format);
}
break;
}
}
// display current frame
pictureBox1.Image = frameImage;
GC.Collect(); // collect the garbage after the deletion
// make UI controls accessible
Application.DoEvents();
}
FSDKCam.CloseVideoCamera(cameraHandle);
FSDKCam.FinalizeCapturing();
}
private void btnRemember_Click(object sender, EventArgs e)
{
faceTemplates.Clear();
programState = ProgramState.psRemember;
label1.Text = "Look at the camera";
}
}
}
沒有在代碼做我看到'br1.Read'，並且這個錯誤非常普遍，很難以任何方式幫助你。 – JonH 2012-08-15 13:39:23
是你的發佈代碼中的序列鍵？ – Mizipzor 2012-08-15 13:44:53
@DavidB將該評論作爲答案，您將得到一個贊成票。 – Mizipzor 2012-08-15 13:47:48