funcptr.java

用于Java 组件和通过Windows COM 对象或Windows DLL 来公开的组件之间的互操作

//******************************************************************
// Released under the DevelopMentor OpenSource Software License.
// Please consult the LICENSE file in the project root directory,
// or at http://www.develop.com for details before using this
// software.
//******************************************************************

package com.develop.jawin;

import com.develop.jawin.marshal.*;

public final class FuncPtr 
{
  /** The function pointer. */
  private int peer;
  /** The dll handle. */
  private int dllHandle;
  /** The library name. */
  private String dll;
  /** The entry point name. This may not be the same as the name in source code, 
      use DUMPBIN /EXPORTS to get the exact name. */
  private String name;
  private int hash;
    
  public FuncPtr(String dll, String name) throws COMException {
    this.name = name;
    this.dll = dll;
    dllHandle = Bootstrap.loadLibrary(dll);
    peer = Bootstrap.loadFunction(dllHandle, name);
    hash = dll.hashCode() ^ name.hashCode();
  }

  public int hashCode() {
    return hash;
  }
    
  public int getPeer() {
    return peer;
  }
    
  public boolean equals(Object o) {
    if (o == null) 
      return false;
    if (o.getClass() != getClass())
      return false;
    if (o == this)
      return true;
    FuncPtr fp = (FuncPtr) o;
    return (dll.equals(fp.dll) && name.equals(fp.name));
  }
  
  /**
   * Call to "free" the function pointer. Windows automatically
   * manages a reference count for each library and will close the
   * library if this was the last active function.
   */
  public synchronized void close() {
    if (peer != 0) {
      Bootstrap.freeLibrary(dllHandle);
      dllHandle = 0;
      peer = 0;
    }
  }
  protected void finalize() {
    close();
  }

  public int invoke(ReturnFlags flags) {
    return SharedStubs.invoke_I(peer, flags.value);
  }
  public int invoke(int arg0, ReturnFlags flags) {
    return SharedStubs.invokeI_I(arg0, peer, flags.value);
  }
  public int invoke(int arg0, int arg1, ReturnFlags flags) {
    return SharedStubs.invokeII_I(arg0, arg1, peer, flags.value);
  }
  public int invoke(int arg0, int arg1, int arg2, int arg3, ReturnFlags flags) {
    return SharedStubs.invokeIIII_I(arg0, arg1, arg2, arg3, peer, flags.value);
  }
  public int invoke(String arg0, ReturnFlags flags) {
    return SharedStubs.invokeG_I(arg0, peer, flags.value);
  }
  public int invoke(String arg0, String arg1, ReturnFlags flags) {
    return SharedStubs.invokeGG_I(arg0, arg1, peer, flags.value);
  }
  public int invoke(int arg0, String arg1, String arg2, int arg3, ReturnFlags flags) {
    return SharedStubs.invokeIGGI_I(arg0, arg1, arg2, arg3, peer, flags.value);
  }

}