我已经使用 PtrToStructure 函数（在 vb.NET 中）从有效指针中成功提取了结构对象，问题是“FrameRects”字段与从 C++ 示例中获得的值相比具有无效值：
vb.NET 代码是：
StructLayout(LayoutKind.Explicit, pack:=1, CharSet:=CharSet.Ansi)> _"
Public Structure myStruct
<FieldOffset(0)> _
Dim Width As UInt32 ' 350 correct
<FieldOffset(4)> _
Dim Height As UInt32 ' 466 correct
<FieldOffset(8)> _
Dim Frames As UInt32 ' 115 correct
<FieldOffset(12)> _
Dim FrameNum As UInt32 ' 1 correct
<FieldOffset(20)> _
Dim FrameRate As UInt32 ' 15 correct
<FieldOffset(24)> _
Dim FrameRateDiv As UInt32 ' 1 correct
<FieldOffset(28)> _
Dim ReadError As UInt32 ' 0 correct
<FieldOffset(32)> _
Dim OpenFlags As Integer ' 0 correct
<FieldOffset(16)> _
<MarshalAs(UnmanagedType.Struct)> _
Dim FrameRects As RECT ' the problem is located here
<FieldOffset(36)> _
Dim NumRects As UInt32 ' 0 correct
<FieldOffset(44)> _
Dim FrameChangePercent As UInt32 ' 0 correct
End Structure
"StructLayout(LayoutKind.Explicit, pack:=1, CharSet:=CharSet.Ansi)> _
Public Structure RECT
<MarshalAs(UnmanagedType.I4)> _
<FieldOffset(0)> _
Dim Left As Integer ' gives me -1 but it must be 0 (in C++ sample)
<MarshalAs(UnmanagedType.I4)> _
<FieldOffset(4)> _
Dim Top As Integer ' gives me 15 but it must be 0 (in C++ sample)
<MarshalAs(UnmanagedType.I4)> _
<FieldOffset(8)> _
Dim Width As Integer ' gives me 1 but it must be 0 (in C++ sample)
<MarshalAs(UnmanagedType.I4)> _
<FieldOffset(12)> _
Dim Height As Integer ' gives me 0 and it is 0 (in C++ sample)
End Structure
C++ 代码是：
struct myStruct
{
U32 Width; // U32 is unsigned integer
U32 Height;
U32 Frames;
U32 FrameNum;
U32 FrameRate;
U32 FrameRateDiv;
U32 ReadError;
OPEN_FLAGS OpenFlags; // integer
RECT_ARRAY FrameRects;
U32 NumRects;
U32 FrameChangePercent;
};
struct RECT
{
S32 Left; // S32 is singed integer
S32 Top;
S32 Width;
S32 Height;
};