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POVB.net Passing a structure to unmanaged dll
 

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  1. POVB.net Passing a structure to unmanaged dll
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    <p>I'm migrating some VB6 code to VB.net, the code contains a structure that contains 1d arrays, 2d arrays, and few other variables.</p> <p>The general outline of the Vb.net structure is as under</p> <pre><code>Public Structure Test Dim a As Single Dim b As Single Dim c As Single &lt;VBFixedArray(2)&gt; Dim arr1() As Single &lt;VBFixedArray(2, 2)&gt; Dim mdarr1(,) As Single &lt;VBFixedArray(4)&gt; Dim arr2() As Byte &lt;VBFixedArray(4)&gt; Dim arr3() As Short &lt;VBFixedArray(3, 2)&gt; Dim mdarr2(,) As Integer Dim d As Integer Dim e As Decimal End Structure </code></pre> <p>The call to the dll is declared as under</p> <pre><code>Public Declare Sub getState Lib "val.dll" (ByRef state As Test) </code></pre> <p><a href="https://stackoverflow.com/questions/2919048/passing-a-structure-containing-an-array-of-string-and-an-array-of-integer-into-a">Elsewhere</a> on this site I realized that we have to "marshal" the structure to allow it to be compatible with the unmanaged code that is about to accept it.</p> <p>However I still receiving runtime errors when running the code, I don't have any clue of how to use the <code>System.Runtime.InteropServices.Marshal</code> class.</p> <p>What would be the correct way to pass this structure to the dll?</p> <p><strong>EDIT:</strong></p> <p>The original VB6 data type is</p> <pre><code>Public Type Test a As Single b As Single c As Single arr1(0 To 2) As Single mdarr1(0 To 2, 0 To 2) As Single arr2(0 To 4) As Byte arr3(0 To 4) As Integer mdarr2(0 To 3, 0 To 2) As Long d As Long e As Currency End Type </code></pre>
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    1. USKevin Boyd
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    1. COWhat errors are you receiving?
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      1. USChris Haas
    2. COMemory errors, something like memory could be corrupt
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      1. USKevin Boyd
    3. COWhat was the original VB6 structure definition? Remember the integer size has changed from 2 bytes in length in VB6 to 4 bytes length in .Net
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      1. USMark Hall
 

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