Crystal Report无法正确显示图像

我对Crystal Reports没有多少经验，我需要一些帮助。我有一个画布，我用它来进行在线签名。我正在使用Javascript来获取图像，然后将其放在隐藏的字段中。然后我将图像提交给数据库，然后将我的签名字段拖放到水晶报表中。当我将报告导出为PDF时，图像显示为黑盒子。我检索了图像并将其保存在我的本地计算机上作为测试，它工作正常。



这是我的编码。

Hi, I don't have much experience with Crystal Reports and I am in need of some assistance. I have a canvas which I am using for an online signature. I'm using Javascript to get the image, then place it in a hidden field. I then submit the image to the db and I drag and drop my signature field in the crystal report. When I export the report as a PDF the image displays as a black box. I have retrieved the image and saved it on my local machine as a test and it works fine.

Here is my coding.

var image = document.getElementById("sketch").toDataURL("image/png");
image = image.replace('data:image/png;base64,', '');
var hiddenField = document.getElementById('<%= hidImg.ClientID %>');

hiddenField.value =图片;

hiddenField.value = image;

 protected void btnSubmit_Click(object sender, EventArgs e)
    {
        //TODO: Find a way to save Canvas.
        var img = hidImg.Value;
        byte[] data = Convert.FromBase64String(img);
        Logsheets_Online LOs = new Logsheets_Online();
        LOs.LogsheetID = long.Parse(txtLogNumber.Text);
        LOs.Date = DateTime.Parse(txtDate.Text);
        LOs.OrderNumber = txtOrderNumber.Text;
        LOs.CallReferenceNumber = txtCallReferenceNumber.Text;
        LOs.CompanyID = int.Parse(ddlCompany.SelectedValue);
        LOs.ClientID = int.Parse(ddlCompany.SelectedValue);
        LOs.ClientName = txtOther.Text;
        LOs.EmployeeID = int.Parse(ddlEmployee.SelectedValue);
        LOs.TimeArrived = TimeSpan.Parse(txtTimeArrived.Text);
        LOs.TimeDeparted = TimeSpan.Parse(txtTimeDeparted.Text);
        LOs.TravelTime = int.Parse(txtTravelTime.Text);
        LOs.BillableKilometers = int.Parse(txtBillableKilometers.Text);
        LOs.SLA = int.Parse(txtSLA.Text);
        LOs.Other = int.Parse(txtOther.Text);
        LOs.BillableTime = int.Parse(txtBillableTime.Text);
        LOs.Rate = decimal.Parse(txtRate.Text);
        LOs.Name = txtName.Text;
        LOs.ClientSignature = data;
        LO.Logsheets_Onlines.InsertOnSubmit(LOs);
        LO.SubmitChanges();
}

任何帮助将不胜感激。谢谢

Any help would be appreciated. Thanks