>我可以Dll导入常用函数,但导入这类函数失败,下面是DLL头文件。
typedef struct
{
VOID (* API_GetUID)(CHAR *pData, DWORD DataLen);
DWORD (* API_GetChipType)();
} API_FUNCTION_STRUCT, *API_FUNCTION_STRUCT;
extern VOID WINAPI GetAPIObject(API_FUNCTION_STRUCT *pApiFunc);
我无法用 C# 编写正确的结构。
public struct test
{
IntPtr API_GetUID(IntPtr pData, int DataLen);
IntPtr API_GetChipType();
}
[DllImport(@"GDevice.dll")]
public static extern void GetAPIObject(ref test test_a);
更新:
public struct test
{
delegate void API_GetUID(IntPtr pData, int DataLen);
delegate void API_GetChipType();
}
您可能需要使用 Marshal.GetDelegateForFunctionPointer
函数
这将IntPtr
指向本机方法,并返回可以调用的委托。
public struct test
{
IntPtr API_GetUID;
IntPtr API_GetChipType;
}
[DllImport(@"GDevice.dll")]
public static extern void GetAPIObject(ref test test_a);
delegate void GetUID_Delegate(IntPtr pData, uint dataLen);
delegate uint GetChipType_Delegate();
test a = new test();
GetAPIObject(ref a);
GetUID_Delegate getUID = Marshal.GetDelegateForFunctionPointer<GetUID_Delegate>(a.API_GetUID);
GetChipType_Delegate getChipType = Marshal.GetDelegateForFunctionPointer<GetChipType_Delegate>(a.API_GetChipType);
uint chipType = getChipType();
编辑
或者使用 UnmanagedFunctionPointerAttribute。
public struct test
{
GetUID_Delegate API_GetUID;
GetChipType_Delegate API_GetChipType;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate void GetUID_Delegate(IntPtr pData, uint dataLen);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate uint GetChipType_Delegate();
}
[DllImport(@"GDevice.dll")]
public static extern void GetAPIObject(ref test test_a);
test a = new test();
GetAPIObject(ref a);
uint chipType = a.API_GetChipType();