这篇文章将为大家详细讲解有关如何从服务端下载到本地图片并在Image控件中显示，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。
根据图片名查询服务端的三种图片，再依次显示在对应的Image控件上。
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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using DevExpress.XtraReports.UI;
using System.Data;
using TRSCore;
using System.Text;
using MESCore;
using DevExpress.DataAccess.EntityFramework;
using System.Collections.Generic;
using System.Windows.Forms;
using System.IO;
using Neodynamic.SDK.Printing;
namespace QCMCore.Reports
{
public partial class rptQCMCOACard : DevExpress.XtraReports.UI.XtraReport
{
public rptQCMCOACard()
{
InitializeComponent();
}
public rptQCMCOACard(DataTable dt,string sBatchID,string sModelID)
{
InitializeComponent();
this.dtOrd = dt;
this.sBatchID = sBatchID;
this.sModelID = sModelID;
}
DataTable dtOrd = new DataTable();
DataSet ds = new DataSet();
string sBatchID = "";
string sModelID = "";
string sImage1 = "";
string sImage2 = "";
string sImage3 = "";
private bool View_Iamges()
{
TRSNode in_node = new TRSNode("View_Label_In");
TRSNode out_node = new TRSNode("View_Label_Out");
try
{
sImage1 = "图片1-1.png";
sImage2 = "图片3-1.png";
sImage3 = "图片2.png";
List<string> Imagelist = new List<string>();
List<XRPictureBox> xrImagelist = new List<XRPictureBox>();
xrImagelist.Add(xrPictureBox1);
xrImagelist.Add(xrPictureBox2);
xrImagelist.Add(xrPictureBox3);
Imagelist.Add(sImage1);
Imagelist.Add(sImage2);
Imagelist.Add(sImage3);
if (Imagelist != null && Imagelist.Count > 0)
{
for (int i = 0; i < Imagelist.Count; i++)
{
if (Imagelist[i] != "")
{
//open a thermal label template
// string filePath = Application.StartupPath + "\\UserFile\\Label\\" + sLastSaveFile;
#region 服务器文件下载
in_node = new TRSNode("View_File_In");
out_node = new TRSNode("Cmn_Out");
CommonRoutine.SetInMsg(in_node);
in_node.ProcStep = '2';
in_node.AddString("FILENAME", CommonFunction.Trim(Imagelist[i]));
if (CommonRoutine.CallService("BAS", "BAS_View_File", in_node, ref out_node) == false)
{
return false;
}
#endregion
byte[] bytearay = CommonFunction.RemoveByteOrderMark(out_node.GetBlob("FILEDATA"));
if (bytearay != null)
{
MemoryStream ms_buffer;
try
{
ms_buffer = new MemoryStream(); //对于要重复使用缓存而不是保存到本地再引用，避免报错：图片已被另一进程中使用
ms_buffer.Write(bytearay, 0, bytearay.Length);
ms_buffer.Position = 0;
xrImagelist[i].Image = null; //
xrImagelist[i].Image = Image.FromStream(ms_buffer);
string filedata = System.Text.Encoding.Default.GetString(bytearay);
}
catch (Exception ex)
{
CommonFunction.ShowMsgBox(ex.Message);
}
}
}
}
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
CommonFunction.ShowMsgBox(ex.Message);
return false;
}
}
private bool FillHeader()
{
try
{
if (dtOrd == null)
{
CommonFunction.ShowMsgBox("请先选择需要打印的ITEM！");
return false;
}
this.xrtBatchID.Text = sBatchID;
this.xrtModel.Text = sModelID;
if (View_Iamges()==false )
{
CommonFunction.ShowMsgBox("图片找不到！");
return false;
}
//this.xrPictureBox1.ImageUrl = Application.StartupPath + "\\UserFile\\Images\\图片1-1.png";
//this.xrPictureBox2.ImageUrl = Application.StartupPath + "\\UserFile\\Images\\图片3-1.png";
//this.xrPictureBox3.ImageUrl = Application.StartupPath + "\\UserFile\\Images\\图片2.png";
this.xrtDateTime.Text = DateTime.Now.ToShortDateString().ToString(); // 20018-9-4
if (dtOrd.Rows.Count > 0)
{
ds.Clear();
ds.Tables.Add(dtOrd.Copy()); //使用Copy的Table，以免报错：DataTable已存在另一个DataSet
XtraReport report = new XtraReport();
report.DataSource = ds;
report.DataMember = "queryProducts";
List<DataTable> list = new List<DataTable>();
for (int i = 0; i < dtOrd.Rows.Count;i++) {
DataTable dt = new DataTable();
dt.Columns.Add("ITEM_SEQ");
dt.Columns.Add("TESTING_ITEM");
dt.Columns.Add("TESTING_RESULT");
dt.Columns.Add("TESTING_SPECIFICATION");
dt.Columns.Add("DIMENS");
dt.Columns.Add("TESTING_METHOD");
dt.Rows.Add(dtOrd.Rows[i].ItemArray);
list.Add(dt);
}
XRTable table = new XRTable();
for (int i = 0; i < dtOrd.Rows.Count; i++)
{
if (list[i]!=null) {
XRTableRow row = new XRTableRow();
XRTableCell TESTING_ITEM = new XRTableCell();
XRTableCell TESTING_RESULT = new XRTableCell();
XRTableCell TESTING_SPECIFICATION = new XRTableCell();
XRTableCell DIMENS = new XRTableCell();
XRTableCell TESTING_METHOD = new XRTableCell();
row.Cells.Add(TESTING_ITEM);
row.Cells.Add(TESTING_RESULT);
row.Cells.Add(TESTING_SPECIFICATION);
row.Cells.Add(DIMENS);
row.Cells.Add(TESTING_METHOD);
//TESTING_ITEM.WidthF = 140.14f;
//TESTING_RESULT.WidthF = 140.14f;
//TESTING_SPECIFICATION.WidthF = 140.14f;
//DIMENS.WidthF = 140.14f;
//TESTING_METHOD.WidthF = 140.14f;
TESTING_ITEM.DataBindings.Add("Text", list[i], "TESTING_ITEM");
TESTING_RESULT.DataBindings.Add("Text", list[i], "TESTING_RESULT");
TESTING_SPECIFICATION.DataBindings.Add("Text", list[i], "TESTING_SPECIFICATION");
DIMENS.DataBindings.Add("Text", list[i], "DIMENS");
TESTING_METHOD.DataBindings.Add("Text", list[i], "TESTING_METHOD");
xrTable7.Rows.Add(row);
//xrTable7.InsertRowBelow(xrTable7.Rows[i]);
}
}
DetailBand detailBand = new DetailBand();
detailBand.Controls.Add(table);
report.Bands.Add(detailBand);
}
return true;
}
catch (Exception ex)
{
CommonFunction.ShowMsgBox(ex.Message);
return false;
}
}
private void ReportHeader_BeforePrint(object sender, System.Drawing.Printing.PrintEventArgs e)
{
FillHeader();
}
}
}=========初试代码有bug
private bool View_Iamges()
{
TRSNode in_node = new TRSNode("View_Label_In");
TRSNode out_node = new TRSNode("View_Label_Out");
try
{
sImage1 = "图片1-1.png";
sImage2 = "图片3-1.png";
sImage3 = "图片2.png";
List<string> Imagelist = new List<string>();
Imagelist.Add(sImage1);
Imagelist.Add(sImage2);
Imagelist.Add(sImage3);
if (Imagelist != null && Imagelist.Count > 0)
{
for (int i = 0; i < Imagelist.Count; i++)
{
if (Imagelist[i] != "")
{
//open a thermal label template
// string filePath = Application.StartupPath + "\\UserFile\\Label\\" + sLastSaveFile;
#region 服务器文件下载
in_node = new TRSNode("View_File_In");
out_node = new TRSNode("Cmn_Out");
CommonRoutine.SetInMsg(in_node);
in_node.ProcStep = '2'; //查询对应的文件夹
in_node.AddString("FILENAME", CommonFunction.Trim(Imagelist[i]));
if (CommonRoutine.CallService("BAS", "BAS_View_File", in_node, ref out_node) == false)
{
return false;
}
#endregion
byte[] bytearay = CommonFunction.RemoveByteOrderMark(out_node.GetBlob("FILEDATA"));
if (bytearay != null)
{
string filedata = System.Text.Encoding.Default.GetString(bytearay);
//保存Label文件到本地，进行编辑
string filePath = Application.StartupPath + "\\UserFile\\Images\\" + Imagelist[i];
File.WriteAllBytes(filePath, bytearay);
string picPath = filePath.Substring(0, filePath.Length - 4) + ".png";//本地Label图片路径
if (!File.Exists(picPath))//如果图片不存在，生成
{
ThermalLabel tl = ThermalLabel.CreateFromXmlTemplate(filedata);
//Display ThermalLabel as a TIFF image
if (tl != null)
{
//替换DataField，使其显示
foreach (Item item in tl.Items)
{
if (item.DataField != "")
{
item.DataField = "";//必须置为空，否则无法显示
}
}
using (PrintJob pj = new PrintJob())
{
pj.ThermalLabel = tl;
pj.Copies = 1;
MemoryStream ms = new MemoryStream();
ImageSettings imgSett = new ImageSettings();
imgSett.ImageFormat = Neodynamic.SDK.Printing.ImageFormat.Png;
//imgSett.PixelFormat = PixelFormat.BGRA32;
imgSett.AntiAlias = true;
//imgSett.TransparentBackground = true;
pj.ExportToImage(picPath, imgSett, 300);
}
}
}
//在对应的控件中显示
if (i == 0)
xrPictureBox1.Image = Image.FromFile(picPath);
if (i == 1)
xrPictureBox2.Image = Image.FromFile(picPath);
if (i == 2)
xrPictureBox3.Image = Image.FromFile(picPath);
}
}
}
return true;
}
return false;
}
catch (Exception ex)
{
CommonFunction.ShowMsgBox(ex.Message);
return false;
}
}注：
1、当所用的图片需要被重复引用时，将图片从服务端下载至本地再引用的做法容易报错：图片正由另一个进程使用。
解决方法，一是使用File.WriteAllBytes()方法时，记得释放资源。
二是使用内存的方式直接将图片填充至控件上，而不是将图片下载至客户端，再填充。
MemoryStream ms_buffer;
try
{
ms_buffer = new MemoryStream(); //对于要重复使用缓存而不是保存到本地再引用，避免报错：图片已被另一进程中使用
ms_buffer.Write(bytearay, 0, bytearay.Length);
ms_buffer.Position = 0;
xrImagelist[i].Image = null; //
xrImagelist[i].Image = Image.FromStream(ms_buffer);
string filedata = System.Text.Encoding.Default.GetString(bytearay);
}
catch (Exception ex)
{
CommonFunction.ShowMsgBox(ex.Message);
}2、当传入的DataTable被重复使用时，容易报错：DataTable已属于另一个DataSet。
解决方法就是添加克隆表或复制的表到DataSet中。
ds.Tables.Add(dtOrd.Copy());关于如何从服务端下载到本地图片并在Image控件中显示就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
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原文链接：https://my.oschina.net/8824/blog/3124418
