C#制作ActiveX控件在网页上使用.doc

C#制作ActiveX控件并在Web中使用C#制作ActiveX控件，一般来说并不推荐这样做。因为还要为客户安装对应的.Net Framework版本。现在一个示例实现将手写板的签字图片复制到剪贴板，从剪贴板的图片中对图片进行按比例缩放，并保存为 C:oaSignDpi.jpg。1.在Visual Studio 2010中，新建项目Windows窗体控件库。命名为SaveClipImage2. 在SaveClipImage项目中 新建一个接口IObjectSafety. 这个接口内容最好不要变更。接口IObjectSafety具体代码如下：using System;using System.Collections.Generic;using System.Runtime.InteropServices;using System.Text;namespace SaveClipImage ComImport, GuidAttribute(CB5BDC81-93C1-11CF-8F20-00805F2CD064) InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown) public interface IObjectSafety PreserveSig int GetInterfaceSafetyOptions(ref Guid riid, MarshalAs(UnmanagedType.U4) ref int pdwSupportedOptions, MarshalAs(UnmanagedType.U4) ref int pdwEnabledOptions); PreserveSig() int SetInterfaceSafetyOptions(ref Guid riid, MarshalAs(UnmanagedType.U4) int dwOptionSetMask, MarshalAs(UnmanagedType.U4) int dwEnabledOptions); 3.在默认的UserControl1控件上增加一个PictureBox，设置可见性级别为Public.详细代码如下：using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Runtime.InteropServices;using System.Text;using System.Windows.Forms;using System.Management;namespace SaveClipImage Guid(6F151B97-B972-4112-BEB1-754173BAA80C), /（这个Guid必须要和制作安装文件时的Guid号码一样）ProgId(_20131017.UserControl1), ComVisible(true) /（控件必须添加的内容） public partial class UserControl1 : UserControl, IObjectSafety public string fileName = ; System.Runtime.InteropServices.DllImport(user32) private static extern IntPtr SetClipboardViewer(IntPtr hwnd); System.Runtime.InteropServices.DllImport(user32) private static extern IntPtr ChangeClipboardChain(IntPtr hwnd, IntPtr hWndNext); System.Runtime.InteropServices.DllImport(user32) private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam); const int WM_DRAWCLIPBOARD = 0x308; const int WM_CHANGECBCHAIN = 0x30D; public IntPtr NextClipHwnd;/下一个句柄 public UserControl1() InitializeComponent(); pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize; Clipboard.Clear(); /获得观察链中下一个窗口句柄 NextClipHwnd = SetClipboardViewer(this.Handle); public bool ThumbnailCallback() return false; / / 按比例缩放图片 / / 原图片 / 保存缩放后的图片路径 / 标准高度 如果大于标准高度，则按比例缩放 public bool ReducedImage(Image ResourceImage, string newImagePath, int StandardHeight) Image ReducedImage = null; try Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback); int ImageWidth; int ImageHeight; if (ResourceImage.Height StandardHeight) /如果图片高度大于标准高度，按比例缩放 ImageWidth = (int)(double)StandardHeight * ResourceImage.Width / ResourceImage.Height); ImageHeight = StandardHeight; else /如果没有大于标准高度 则保持不变 ImageWidth = ResourceImage.Width; ImageHeight = ResourceImage.Height;/ResourceImage.HorizontalResolution ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero); if (System.IO.File.Exists(newImagePath) try System.IO.File.Delete(newImagePath); catch ReducedImage.Save(newImagePath, System.Drawing.Imaging.ImageFormat.Jpeg); ReducedImage.Dispose(); ResourceImage.Dispose(); return true; catch (Exception ex) MessageBox.Show(ex.Message, 错误); if (ResourceImage != null) ResourceImage.Dispose(); if (ReducedImage != null) ReducedImage.Dispose(); return false; private void button1_Click()/(object sender, EventArgs e) Image img = Clipboard.GetImage();/获得剪贴板的图片 if (img = null) /MessageBox.Show(没有找到签名图片，请用手写板签名., 错误); fileName = ; /pictureBox1.Image.Dispose(); /pictureBox1.Image = null; return; string saveFileName = C:oaSign.jpg; /if (System.IO.File.Exists(saveFileName) / / try / / System.IO.File.Delete(saveFileName); / / catch / if (pictureBox1.Image != null) pictureBox1.Image.Dispose(); pictureBox1.Image = null; if (ReducedImage(img, saveFileName, 40) /Clipboard.Clear(); try Image srcImg = Image.FromFile(saveFileName); Bitmap bmp = new Bitmap(srcImg); int xDpi = 96; int yDpi = 96; GetSystemDpi(ref xDpi, ref yDpi); bmp.SetResolution(xDpi, yDpi);/设置水平 和 垂直DPI都是96 大多数显示器默认 /srcImg.Dispose(); string fileDpi96 = C:oaSignDpi.jpg; if (pictureBox1.Image != null) pictureBox1.Image.Dispose(); if (System.IO.File.Exists(fileDpi96) try System.IO.File.Delete(fileDpi96); catch bmp.Save(fileDpi96, System.Drawing.Imaging.ImageFormat.Jpeg); /Image displayImg = Image.FromFile(fileDpi96); pictureBox1.Image = Image.FromFile(fileDpi96); bmp.Dispose(); /Application.DoEvents(); /displayImg.Dispose(); fileName = fileDpi96; srcImg.Dispose(); img.Dispose(); /if (pictureBox1.Image != null) / / pictureBox1.Image.Dispose(); / catch (Exception ex) if (img != null) img.Dispose(); MessageBox.Show(ex.Message); fileName = ; else /Clipboard.Clear(); fileName = ; /pictureBox1.Image.Dispose(); /pictureBox1.Image = null; / / 使用WMI对象获取系统的DPI / / / public void GetSystemDpi(ref int xDpi, ref int yDpi) using (ManagementClass mc = new ManagementClass(Win32_DesktopMonitor) using (ManagementObjectCollection moc = mc.GetInstances() int PixelsPerXLogicalInch = 0; / dpi for x int PixelsPerYLogicalInch = 0; / dpi for y foreach (ManagementObject each in moc) PixelsPerXLogicalInch = int.Parse(each.PropertiesPixelsPerXLogicalInch.Value.ToString(); PixelsPerYLogicalInch = int.Parse(each.PropertiesPixelsPerYLogicalInch.Value.ToString(); xDpi = PixelsPerXLogicalInch; yDpi = PixelsPerYLogicalInch; /MessageBox.Show(xDpi.ToString() + , + yDpi); protected override void WndProc(ref Message m) switch (m.Msg) case WM_DRAWCLIPBOARD: /将WM_DRAWCLIPBOARD消息传递到下一个观察链中的窗口 SendMessage(NextClipHwnd, m.Msg, m.WParam, m.LParam); IDataObject iData = Clipboard.GetDataObject(); /检测图像 if (iData.GetDataPresent(DataFormats.Bitmap) /pictureBox1.Image = Clipboard.GetImage(); button1_Click(); /CopyToClipboard(); break; default: base.WndProc(ref m); break; private const string _IID_IDispatch = 00020400-0000-0000-C000-000000000046; private const string _IID_IDispatchEx = a6ef9860-c720-11d0-9337-00a0c90dcaa9; private const string _IID_IPersistStorage = 0000010A-0000-0000-C000-000000000046; private const string _IID_IPersistStream = 00000109-0000-0000-C000-000000000046; private const string _IID_IPersistPropertyBag = 37D84F60-42CB-11CE-8135-00AA004BB851; private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001; private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002; private const int S_OK = 0; private const int E_FAIL = unchecked(int)0x80004005); private const int E_NOINTERFACE = unchecked(int)0x80004002); private bool _fSafeForScripting = true; private bool _fSafeForInitializing = true; #region IObjectSafety 成员 public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions) int Rslt = E_FAIL; string strGUID = riid.ToString(B); pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA; switch (strGUID) case _IID_IDispatch: case _IID_IDispatchEx: Rslt = S_OK; pdwEnabledOptions = 0; if (_fSafeForScripting = true) pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER; break; case _IID_IPersistStorage: case _IID_IPersistStream: case _IID_IPersistPropertyBag: Rslt = S_OK; pdwEnabledOptions = 0; if (_fSafeForInitializing = true) pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA; break; default: Rslt = E_NOINTERFACE; break; return Rslt; public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions) int Rslt = E_FAIL; string strGUID = riid.ToString(B); switch (strGUID) case _IID_IDispatch: case _IID_IDispatchEx: if (dwEnabledOptions & dwOptionSetMask) = INTERFACESAFE_FOR_UNTRUSTED_CALLER) & (_fSafeForScripting = true) Rslt = S_OK; break; case _IID_IPersistStorage: case _IID_IPersistStream: case _IID_IPersistPropertyBag: if (dwEnabledOptions & dwOptionSetMask) = INTERFACESAFE_FOR_UNTRUSTED_DATA) & (_fSafeForInitializing = true) Rslt = S_OK; break; default: Rslt = E_NOINTERFACE; break; return Rslt; #endregion 4. 在解决方案下，新建项目安装于部署 命名为ClipImage在ClipImage中添加项目输出。整个项目的内容解决方案菜单如下：设置SaveClipImage.tlb的Register属性为vsdrfCOM.将ClipImage生成。生成如下两个文件：5. 制作cab下载这个程序包，可以从微软下载，地址：/download/platformsdk/cab/2.0/w98nt42kmexp/en-us/cabsdk.exe 将cabsdk解压后在cabsdk的BIN目录下，复制ClipImage.msi到这个目录下。增加3个文件(全部用记事本打开，更新后保存)：installer.infcab.ddfmakecab.bat这三个文件的具体内容：installer.inf的具体内容：Setup Hookshook1=hook1hook1run=msiexec /i %EXTRACT_DIR%ClipImage.msi /qnVersionSigna