108 lines
3.0 KiB
Java
108 lines
3.0 KiB
Java
package com.jacob.com;
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/**
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* SF 1085370
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In my understatnding, an instance of SafeArray java
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class has a
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value of a pointer to VARIANT structure that contains a
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pointer to
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a SAFEARRAY strucuture.
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On the other hand, we can create a Variant object from
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the
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SafeArray object like this:
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SafeArray sa = ...;
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Variant val = new Variant(sa);
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the val object has a pointer to another VARIANT
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structure that
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contains a pointer to the same SAFEARRAY structure.
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In this case, the val object has a pointer to another
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VARIANT that
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contains a pointer to the same SAFEARRAY like this:
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+-----------+
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|SafeArray | +------------+
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| m_pV--->VARIANT(a) |
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+-----------+ | VT_ARRAY| +---------+
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| parray---->SAFEARRAY|
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+------------+ +^--------+
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+-----------+ |
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|Variant | +------------+ |
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| m_pVariant--->VARIANT(b) | |
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+-----------+ | VT_ARRAY| |
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| parray-----+
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+------------+
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When previous objects are rereased by
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ComThread.Release(),
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first the VARIANT(a) is released by VariantClear()
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function,
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and second the VARIANT(b) is released by VariantClear()
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function too.
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But the SAFEARRAY was already released by the
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VARIANT(a).
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So, in my enviroment (WinXP + J2SDK 1.4.1) the
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following java program
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is sometimes crash with EXCEPTION_ACCESS_VIOLATION.
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To solve this problem, it is nessesary to copy the
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SAFEARRAY like this:
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+-----------+
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|Variant | +------------+
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| m_pVariant--->VARIANT(a) |
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+-----------+ | VT_ARRAY| +---------+
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| parray---->SAFEARRAY|
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+------------+ +|--------+
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+-----------+ | copySA()
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|SafeArray | +------------+ |
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| m_pV--->VARIANT(b) | V
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+-----------+ | VT_ARRAY| +---------+
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| parray---->SAFEARRAY|
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+------------+ +---------+
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*/
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public class SafeArrayReleaseTest
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{
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final static int MAX = 300;
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public static void main(String[] args)
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{
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int count;
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System.out.println("Starting test for max = "+MAX);
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for(count = 1; count<MAX; count++)
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{
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int i = 0;
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try
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{
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ComThread.InitMTA();
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for (i = 0; i < count; i++)
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{
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SafeArray a1 = new SafeArray(Variant.VariantVariant, 2);
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a1.setVariant(0, new Variant("foo"));
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a1.setVariant(1, new Variant("bar"));
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Variant v = new Variant(a1);
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SafeArray a2 = v.toSafeArray(true);
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if (a2 == null){
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System.out.println("got null back from toSafeArray()");
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}
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}
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ComThread.Release();
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System.gc();
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//System.out.print(".");
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}
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catch (Exception e)
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{
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System.out.println("\nTest fails with i = " + i + " (max = "+MAX+")");
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e.printStackTrace();
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break;
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}
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}
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System.gc();
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System.out.println("\nTest ends with count = " + count + " (max = "+MAX+")");
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}
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} |