将C ++ / CLI中的int数组返回到c#.NET [英] Returning an int array in C++/CLI to c# .NET
问题描述
我正在使用C ++ / CLI包装器从c#.NET调用c ++库。尽管此特定代码有效,但我怀疑我在内存方面做错了什么。 (在连续运行此代码约20次后,我遇到了问题。)
I'm using a C++/CLI wrapper to call a c++ library from c# .NET. While this particular code "works," I suspect that I'm doing something wrong with respect to memory. (I run into problems after running this code about 20 times in a row.)
c#面:
public void ExportModelToImage(int[] myImage, int imageWidth, int imageHeight)
{
View.ExportModelToImage(ref myImage, imageWidth, imageHeight);
}
C ++ / CLI端:
C++/CLI side:
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,如果ExportModelToImage()返回一个int数组,而不是按引用返回,但是我在找出正确的方法在C ++ / CLI中遇到问题。任何建议将不胜感激。谢谢!
Ideally, I would prefer if ExportModelToImage() returned an int array instead of returning by reference, but I've had problems figuring out the correct way to do that in C++/CLI. Any suggestions would be greatly appreciated. Thanks!
推荐答案
要返回int数组,请具有 array< int> ^
作为返回类型,并使用 gcnew
初始化本地变量。当您呼叫 gcnew
时,别忘了放弃 ^
。
To return an int array, have array<int>^
as your return type, and initialize your local variable with gcnew
. Don't forget to leave off the ^
when you call 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,也就是说,您还可以在这里进行其他操作。特别是,您可能想构造某种.Net图像类型并将其返回,而不是返回整数数组。
Now, that said, there are other possibilities you could do here. In particular, you may want to construct a .Net image type of some sort and return that, rather than returning an array of integers.
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