public static ui.model.SearchResult Search(byte[] imgContent)
{
Contract.Requires(imgContent != null);
Contract.Requires(imgContent.Length != 0);
IntPtr imgContentUnmanagedBuf = IntPtr.Zero;
var result = new structs.SearchResult()
{
items = IntPtr.Zero,
itemsPositions = IntPtr.Zero
};
try
{
imgContentUnmanagedBuf = Marshal.AllocCoTaskMem(imgContent.Length);
Marshal.Copy(imgContent, 0, imgContentUnmanagedBuf, imgContent.Length);
var query = new structs.ImgQuery()
{
exampleContent = imgContentUnmanagedBuf,
exampleContentSize = (UInt32)imgContent.Length,
tolerance = 0.5
};
Search(query, out result);
if (result.opStatus != 0)
{
throw new Exception("Call to the unmanaged DLL failed. Search cannot be performed");
}
if (result.items == IntPtr.Zero || result.itemsPositions == IntPtr.Zero || result.arraySize == 0)
{
//no images found
return(new ui.model.SearchResult());
}
long[] imgIds = new long[result.arraySize];
double[] positions = new double[result.arraySize];
Marshal.Copy(result.items, imgIds, 0, (int)result.arraySize);
Marshal.Copy(result.itemsPositions, positions, 0, (int)result.arraySize);
return(new ui.model.SearchResult(imgIds, positions));
}
finally
{
if (imgContentUnmanagedBuf != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(imgContentUnmanagedBuf);
}
if (result.items != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(result.items);
}
if (result.itemsPositions != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(result.itemsPositions);
}
}
}
private static extern void Search(structs.ImgQuery query, out structs.SearchResult result);
