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Question by
aliaadly · May 08, 2017 at 01:40 PM ·
arraysnative pluginstruct
Pass large array of structs to native plugin
Hello, I want to pass an array of structure to c++ native plugin. I did as below and I can access the data but my application crashes after the c++ function is executed and I am not sure why.
C# side:
[StructLayout(LayoutKind.Sequential)]
public struct SimpleVector3
{
public float Vx, Vy, Vz, Nx, Ny, Nz;
public SimpleVector3(float x, float y, float z, float xx, float yy, float zz)
{
Vx = x;
Vy = y;
Vz = z;
Nx = xx;
Ny = yy;
Nz = zz;
}
}
[DllImport(DLL)]
public static extern int getSomeInt();
[DllImport(DLL, CallingConvention = CallingConvention.Cdecl)]
public static extern bool PopulateVerts([In] IntPtr verts, int numOfVertices);
void Start () {
Vector3 sceneOrigin = Camera.main.transform.position;
Debug.Log("SX " + sceneOrigin.x + " SY " + sceneOrigin.y + " SZ "+ sceneOrigin.z);
SimpleVector3[] trial = new SimpleVector3[2];
SimpleVector3 v2 = new SimpleVector3(sceneOrigin.x, sceneOrigin.y, sceneOrigin.z, sceneOrigin.x + 10, sceneOrigin.y + 10, sceneOrigin.z + 10);
SimpleVector3 v1 = new SimpleVector3(15,10,3,5,10,6);
trial[0] = v1;
trial[1] = v2;
testing(trial);
}
void testing(SimpleVector3[] theList)
{
Debug.Log("the number is " + getSomeInt());
GCHandle pinnedArray = GCHandle.Alloc(theList, GCHandleType.Pinned);
IntPtr ptr = pinnedArray.AddrOfPinnedObject();
// call function passing r
bool x = PopulateVerts(ptr, theList.Length);
Debug.Log("after call " + x);
pinnedArray.Free();
}
C++ side:
extern "C" EXPORT_API int getSomeInt()
{
return 42;
}
extern "C" EXPORT_API bool PopulateVerts(SimpleVector3* verts, int numofVert) {
char buffer[50];
for (int i = 0; i < numofVert; i++) {
sprintf(buffer, "x %f , y %f , z %f \n nx %f , ny %f , nz %f ", (verts->Vx),
(verts->Vy), (verts->Vz), (verts->Nx), (verts->Ny), (verts->Nz));
Debug(buffer);
if(i < (numofVert-1)){
verts++;
}
}
return true;
}
The getSomeInt() is working fine and returns the number but then when it calls PopulateVerts it displays the data then crashes.
Output:
the number is 42
(Filename: C:/buildslave/unity/build/artifacts/generated/Metro/runtime/DebugBindings.gen.cpp Line: 51)
CallBack : x 15.000000 , y 10.000000 , z 3.000000
nx 5.000000 , ny 10.000000 , nz 6.000000
(Filename: C:/buildslave/unity/build/artifacts/generated/Metro/runtime/DebugBindings.gen.cpp Line: 51)
CallBack : x -0.011494 , y 0.069487 , z 0.090230
nx 9.988506 , ny 10.069487 , nz 10.090230
(Filename: C:/buildslave/unity/build/artifacts/generated/Metro/runtime/DebugBindings.gen.cpp Line: 51)
The program '[2640] dllimporttrial.exe' has exited with code -1073740791 (0xc0000409).
Note: This is run on HoloLens
@Jacktang @whydoidoit I saw your post and I would like to do the same but I have no idea what might I be doing wrong.
Thank you in advance!
Comment
The problem is solved. The problem was in the size of the char buffer. It was so small. Increasing it and using _snprintf solved the problem!