将C ++ / CLI中的int数组返回给c#.NET

时间:2014-12-15 20:26:58

标签: c++-cli

我使用C ++ / CLI包装器从c#.NET调用c ++库。虽然这个特殊的代码"有效,"我怀疑我在记忆方面做错了什么。 (连续20次运行此代码后,我遇到了问题。)

c#side:

public void ExportModelToImage(int[] myImage, int imageWidth, int imageHeight)
{
    View.ExportModelToImage(ref myImage, imageWidth, imageHeight);
}

C ++ / CLI方面:

void ExportModelToImage(array<int>^% myImage, int imageWidth, int imageHeight)
{
    if (myView().IsNull())
    {
        return;
    }
    myView()->Redraw();
    Image_PixMap theImage;
    myView()->ToPixMap(theImage, imageWidth, imageHeight);

    const int totalBytes = imageWidth * imageHeight;
    int byteIndex = 0;      
    Standard_Integer si = 0;
    Quantity_Color aColor;
    Quantity_Parameter aDummy;
    for (Standard_Size aRow = 0; aRow < theImage.SizeY(); ++aRow)
    {
        for (Standard_Size aCol = 0; aCol < theImage.SizeX(); ++aCol) 
        {
            aColor = theImage.PixelColor((Standard_Integer )aCol, (Standard_Integer )aRow, aDummy);
            aColor.Color2argb(aColor, si);
            myImage[byteIndex] = (int) si;
            byteIndex++; 
            if (byteIndex > totalBytes) return;
         }
    }
}

理想情况下,我更喜欢ExportModelToImage()返回一个int数组而不是通过引用返回,但我在C ++ / CLI中找出正确的方法时遇到了问题。任何建议将不胜感激。谢谢!

1 个答案:

答案 0 :(得分:3)

要返回一个int数组,请将array<int>^作为返回类型,并使用gcnew初始化本地变量。拨打^时,请不要忘记取消gcnew

array<int>^ ExportModelToImage(int imageWidth, int imageHeight)
{
    array<int>^ result = gcnew array<int>(imageWidth * imageHeight);

    if (myView().IsNull())
    {
        return nullptr;
        // could also return a zero-length array, or the current 
        // result (which would be an all-black image).
    }
    myView()->Redraw();
    Image_PixMap theImage;
    myView()->ToPixMap(theImage, imageWidth, imageHeight);

    int byteIndex = 0;      
    Standard_Integer si = 0;
    Quantity_Color aColor;
    Quantity_Parameter aDummy;
    for (Standard_Size aRow = 0; aRow < theImage.SizeY(); ++aRow)
    {
        for (Standard_Size aCol = 0; aCol < theImage.SizeX(); ++aCol) 
        {
            aColor = theImage.PixelColor((Standard_Integer )aCol, (Standard_Integer )aRow, aDummy);
            aColor.Color2argb(aColor, si);
            result[byteIndex] = (int) si;
            byteIndex++; 
        }
    }

    return result;
}

现在,说,你可以在这里做其他的可能性。特别是,您可能希望构造某种类型的.Net图像类型并返回该类型,而不是返回整数数组。