arcmap二次开发中dll如何获取路径（vb.net）

<P>用vb。net基于arcmap做二次开发，写成dll，不知道如何获取该dll的运行目录，因为要读取dll目录下的文件，不知道用什么接口来获取？</P>

<P>网上找到的:)</P>
<P>有一个这样的API函数可以用：  <BR> <BR>DWORD  GetModuleFileName(  <BR> <BR>       HMODULE  hModule,            //  handle  to  module  to  find  filename  for    <BR>       LPTSTR  lpFilename,            //  pointer  to  buffer  for  module  path    <BR>       DWORD  nSize              //  size  of  buffer,  in  characters    <BR>     );  <BR> <BR>从这个返回值lpFileName中得到路径<BR></P>

<H3>这个文章也可以参考下</H3>
<H3>How to get the .NET applications path?</H3>
<P>In VB6 you can simply write <CODE>App.Path</CODE> to get the path to the application. But there is also many confusion about ‘what is the application path’?</P>
<P>With .NET there might be many different definitions of the applications-path:</P>
<UL>
<LI>The directory where the executable (EXE) is located
<LI>The current working directory
<LI>The directory where the current assembly is located (might be a DLL) </LI></UL>
<P>In the following we assume that <B><I>application-path</I> is the directory of the executable (EXE)</B></P>
<P>For .NET you have many possible ways to get the executable path:</P>
<UL>
<LI>Path.DirectoryName(Application.ExecutablePath)
<LI>Application.StartupPath
<LI>Path.DirectoryName(Environment.GetCommandLineArgs()[0])
<LI>Path.DirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName)
<LI>Path.DirectoryName(Assembly.GetEntryAssembly().Location) </LI></UL>
<P>If you look into the implementation of <a href="http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemWindowsFormsApplicationClassStartupPathTopic.asp" target="_blank" ><FONT color=#666688>Application.StartupPath</FONT></A> you will see that it is using the native <a href="http://msdn.microsoft.com/library/en-us/dllproc/base/getmodulefilename.asp" target="_blank" ><FONT color=#666688>GetModuleFileName</FONT></A> function. So this call really gets the directory of the executable (EXE).</P>
<P><a href="http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemWindowsFormsApplicationClassExecutablePathTopic.asp" target="_blank" ><FONT color=#666688>Application.ExecutablePath</FONT></A> instead is using a difficult method to the the correct result. The simplest way would be to also use <I>GetModuleFileName</I>. But they first try to call <a href="http://msdn.microsoft.com/library/en-us/cpref/html/frlrfsystemreflectionassemblyclassgetentryassemblytopic.asp" target="_blank" ><FONT color=#666688>Assembly.GetEntryAssembly</FONT></A> which also returns the first executed assembly (normally this is also the EXE).</P>
<P>If you do not want to add a reference to the <I>System.Windows.Forms</I> assembly (maybe if you are wrining an console app), the you have to use other functions. You have the following choices:</P>
<UL>
<LI>call the unmanaged GetModuleFileName
<LI>use Assembly.GetEntryAssembly </LI></UL>
<P>Here is solution with <B>GetModuleFileName</B>:</P><PRE>  public class App
  {
    [System.Runtime.InteropServices.DllImport(“kernel32.dll”, SetLastError=true)]
    [System.Security.SuppressUnmanagedCodeSecurity]
    private static extern uint GetModuleFileName(
      [System.Runtime.InteropServices.In]
        IntPtr hModule,
      [System.Runtime.InteropServices.Out]
        System.Text.StringBuilder lpFilename,
      [System.Runtime.InteropServices.In]
      [System.Runtime.InteropServices.MarshalAs(
        System.Runtime.InteropServices.UnmanagedType.U4)]
        int nSize
    );

    public static string StartupPath
    {
      get
      {
        System.Text.StringBuilder sb = new System.Text.StringBuilder(260);
        if (GetModuleFileName(System.IntPtr.Zero, sb, sb.Capacity) == 0)
          throw new System.ApplicationException(“Could not retrive module file name”);
        return System.IO.Path.GetDirectoryName(sb.ToString());
      }
    }
  }<BR></PRE>

<P>呵呵，问题解决，net有类库解决这个问题</P>
<LI>The directory where the executable (EXE) is located <BR>
<LI>The current working directory <BR>
<LI>The directory where the current assembly is located (might be a DLL) </LI>
<P>用assemble类库</P>