小编Jem*_*ino的帖子

我正在尝试捕获此设备扫描的指纹 - > http://www.nitgen.com/eng/product/finkey.html

我能够扫描指纹并成功保存二进制数据.我也可以在图片框中显示指纹.但是,当我试图保存图片框中显示的指纹时,我收到一个错误,即图片框的图像为空.

下面是我的捕获指纹和从图片框保存图像的代码.

public class Form1 : System.Windows.Forms.Form
{
    public NBioBSPCOMLib.NBioBSP objNBioBSP;
    public NBioBSPCOMLib.IExtraction objExtraction;
    private PictureBox pictureExtWnd;

    private void Form1_Load(object sender, System.EventArgs e)
    {
        // Create NBioBSP object
        objNBioBSP = new NBioBSPCOMLib.NBioBSPClass();
        objExtraction = (NBioBSPCOMLib.IExtraction)objNBioBSP.Extraction;
        pictureExtWnd.Image = new Bitmap(pictureExtWnd.Width, pictureExtWnd.Height);
    }

    private void buttonEnroll_Click(object sender, System.EventArgs e)
    {
        //tell NBIO to not display their fingerprint scanning window
        objExtraction.WindowStyle = NBioBSPType.WINDOW_STYLE.INVISIBLE;

        //set the color of the fingerprint captured
        objExtraction.FPForeColor = "000000";

        //set the color of the background …