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[英]How to get unmanaged variable-length C-array within a struct from C to C#?
[英]How to marshal this nested, variable-length C structure in C#
typedef struct pt_bir {
PT_BIR_HEADER Header;
BYTE Data[1]; //variable length based on pt_bir_header.Length
} PT_BIR
typedef struct pt_bir_header {
DWORD Length;
BYTE HeaderVersion;
BYTE Type;
WORD FormatOwner;
WORD FormatID;
CHAR Quality;
BYTE Purpose;
DWORD FactorsMask;
} PT_BIR_HEADER
我的C函数是:
PT_STATUS LoadFinger (
IN PT_CONNECTION hConnection,
IN PT_LONG lSlotNr,
IN PT_BOOL boReturnPayload,
OUT PT_BIR **ppStoredTemplate
)
现在,我需要为C#中的上述C函数做包装。
返回该函数后,应如何PT_BIR**
结构,以及如何将其PT_BIR**
送?
请帮我 ...
您将需要手动将其解组。 首先在C#中声明标头结构
[StructLayout(LayoutKind.Sequential)]
public struct PT_BIR_HEADER
{
public int Length;
public byte HeaderVersion;
public byte Type;
public ushort FormatOwner;
public ushort FormatID;
public char Quality;
public byte Purpose;
public uint FactorsMask;
}
然后为函数声明声明ppStoredTemplate
参数,如下所示:
out IntPtr ppStoredTemplate
函数返回后,您有了ppStoredTemplate
,便可以将其解组。 首先拉出标题:
PT_BIR_HEADER header = (PT_BIR_HEADER)Marshal.PtrToStructure(ppStoredTemplate,
typeof(PT_BIR_HEADER));
然后您可以解压缩数据:
byte[] data = new byte[header.Length];
Marshal.Copy(ppStoredTemplate + Marshal.SizeOf(typeof(PT_BIR_HEADER)), data, 0,
header.Length);
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