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POHow to Marshal C# struct array?
 

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  1. POHow to Marshal C# struct array?
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    <p>I’m developing a fingerprint login for a HRM system. Sample code given with the SDK allows verifying with one template. Here is the segment of the code. </p> <pre><code> BSTypes.ABS_BIR ppEnrolledTemplate; //Load the template array to ppEnrolledTemplate IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(ppEnrolledTemplateArray[i])); Marshal.StructureToPtr(ppEnrolledTemplateArray[i], ptr, false); res = BSApi.ABSVerify(conn, ref op, 1, ref ptr, ref matching_slot, 0); </code></pre> <p>According to the SDK documentation(<a href="http://imageshack.us/photo/my-images/90/fingercapture.png/" rel="nofollow">Link</a>) ABSVerify method allows to input template array as one of the parameters. <strong>I’m finding difficulties marshaling ABS_BIR struct array.</strong> Here is the struct for ABS_BIR.</p> <pre><code> [StructLayout(LayoutKind.Sequential)] public struct ABS_BIR { public ABS_BIR_HEADER Header; // BIR header [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2560)] public byte[] Data; // The data composing the fingerprint template. } </code></pre> <p>This is the solution I came with. I wrote a method called ReadyTemplate()</p> <pre><code>private void readTemplate() { //read template from binary file for (int i = 0; i &lt; 4; i++) { FileStream objFileStream; BinaryReader objBinaryReader; try { // ========== Updated by bubz ============ byte[] data; objFileStream = new FileStream(i + ".bin", FileMode.Open); objBinaryReader = new BinaryReader(objFileStream); data = objBinaryReader.ReadBytes((int)objFileStream.Length); GCHandle pinnedData = GCHandle.Alloc(data, GCHandleType.Pinned); ppEnrolledTemplateArray[i] = (BSTypes.ABS_BIR)Marshal.PtrToStructure(pinnedData.AddrOfPinnedObject(), typeof(BSTypes.ABS_BIR)); displayOut(0, 0, "Template retrieved from PC."); displayOut(0, 0, i.ToString()); objBinaryReader.Close(); // ============ end ==================== } catch (FileNotFoundException FileEx) { displayOut(2, 0, FileEx.Message); return; } catch (Exception Ex) { displayOut(2, 0, Ex.Message); return; } } } </code></pre> <p>Please help me.Thanks.</p>
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    1. COWhat's going wrong, are you getting exceptions and or errors or does it simply not work.
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    2. COWhen trying to pass the template array instead of a single template the ABSVerify() method throws an error saying "Invalid parameter".
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    3. COYou posted the code that works, not the code you are having a problem with.
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