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這篇文章將為大家詳細(xì)講解有關(guān)如何從服務(wù)端下載到本地圖片并在Image控件中顯示，文章內(nèi)容質(zhì)量較高，因此小編分享給大家做個參考，希望大家閱讀完這篇文章后對相關(guān)知識有一定的了解。
根據(jù)圖片名查詢服務(wù)端的三種圖片，再依次顯示在對應(yīng)的Image控件上。
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 = "圖片1-1.png";
sImage2 = "圖片3-1.png";
sImage3 = "圖片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 服務(wù)器文件下載
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(); //對于要重復(fù)使用緩存而不是保存到本地再引用，避免報錯：圖片已被另一進(jìn)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("請先選擇需要打印的ITEM！");
return false;
}
this.xrtBatchID.Text = sBatchID;
this.xrtModel.Text = sModelID;
if (View_Iamges()==false )
{
CommonFunction.ShowMsgBox("圖片找不到！");
return false;
}
//this.xrPictureBox1.ImageUrl = Application.StartupPath + "\\UserFile\\Images\\圖片1-1.png";
//this.xrPictureBox2.ImageUrl = Application.StartupPath + "\\UserFile\\Images\\圖片3-1.png";
//this.xrPictureBox3.ImageUrl = Application.StartupPath + "\\UserFile\\Images\\圖片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，以免報錯：DataTable已存在另一個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();
}
}
}=========初試代碼有bug
private bool View_Iamges()
{
TRSNode in_node = new TRSNode("View_Label_In");
TRSNode out_node = new TRSNode("View_Label_Out");
try
{
sImage1 = "圖片1-1.png";
sImage2 = "圖片3-1.png";
sImage3 = "圖片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 服務(wù)器文件下載
in_node = new TRSNode("View_File_In");
out_node = new TRSNode("Cmn_Out");
CommonRoutine.SetInMsg(in_node);
in_node.ProcStep = '2'; //查詢對應(yīng)的文件夾
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，進(jìn)行編輯
string filePath = Application.StartupPath + "\\UserFile\\Images\\" + Imagelist[i];
File.WriteAllBytes(filePath, bytearay);
string picPath = filePath.Substring(0, filePath.Length - 4) + ".png";//本地Label圖片路徑
if (!File.Exists(picPath))//如果圖片不存在，生成
{
ThermalLabel tl = ThermalLabel.CreateFromXmlTemplate(filedata);
//Display ThermalLabel as a TIFF image
if (tl != null)
{
//替換DataField，使其顯示
foreach (Item item in tl.Items)
{
if (item.DataField != "")
{
item.DataField = "";//必須置為空，否則無法顯示
}
}
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);
}
}
}
//在對應(yīng)的控件中顯示
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、當(dāng)所用的圖片需要被重復(fù)引用時，將圖片從服務(wù)端下載至本地再引用的做法容易報錯：圖片正由另一個進(jìn)程使用。
解決方法，一是使用File.WriteAllBytes()方法時，記得釋放資源。
二是使用內(nèi)存的方式直接將圖片填充至控件上，而不是將圖片下載至客戶端，再填充。
MemoryStream ms_buffer;
try
{
ms_buffer = new MemoryStream(); //對于要重復(fù)使用緩存而不是保存到本地再引用，避免報錯：圖片已被另一進(jìn)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、當(dāng)傳入的DataTable被重復(fù)使用時，容易報錯：DataTable已屬于另一個DataSet。
解決方法就是添加克隆表或復(fù)制的表到DataSet中。
ds.Tables.Add(dtOrd.Copy());
關(guān)于如何從服務(wù)端下載到本地圖片并在Image控件中顯示就分享到這里了，希望以上內(nèi)容可以對大家有一定的幫助，可以學(xué)到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。
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