Question

我试图在非托管C ++ DLL中调用函数。

它有这个原型：

  [DllImport("C:\\Program Files\\MySDK\\VSeries.dll", EntryPoint = "BII_Send_Index_Template_MT" )]
internal unsafe static extern Int32 BII_Send_Index_Template_MT(IntPtr pUnitHandle, ref BII_Template template, Int32 option, Boolean async);

  BII_Template template = new BII_Template();
  error_code = BII_Send_Index_Template_MT(pUnitHandle, ref template, option, false);

这就是我在C＃中定义BII_Template结构的方法：

public unsafe struct BII_Template {
public ulong id;    
public ulong employee_id;  
public ulong password; 

public byte sensor_version;  
public byte template_version; 
public fixed char name[16];   
public byte finger;  
public byte admin_level;  
public byte schedule;  
public byte security_thresh; 
public fixed byte noise_level[18];   
public byte corramb;
public byte reference_x;
public byte reference_y;
public fixed byte ihcore[3];   
public fixed byte ivcore[3]; 
public byte temp_xoffset;  
public byte temp_yoffset;  
public byte index;    
public fixed byte inphase[5500]; 
};

它构建，当我运行它时，dll返回error_code =“记录校验和无效。”

我假设我以错误的方式使用ref或者结构中某些元素的大小是错误的。

-----编辑------------

这是C ++中的结构：

typedef struct {
unsigned long   id;     
unsigned long   employee_id;    
unsigned long   password;   
unsigned char   sensor_version;     
unsigned char   template_version;   
char        name[16];   
unsigned char   finger;     
unsigned char   admin_level;        
unsigned char   schedule;           
unsigned char   security_thresh;    
unsigned char   noise_level[18];    
unsigned char   corramb ;           
unsigned char   reference_x ;
unsigned char   reference_y ;
unsigned char   ihcore[NUM_CORE];
unsigned char   ivcore[NUM_CORE];   
unsigned char   temp_xoffset;       
unsigned char   temp_yoffset;       
unsigned char   index;              
unsigned char   inphase[PACKED_ARRAY_SIZE]; 
} BII_Template;

Answer 1

经过大量测试之后，它使用固定焦炭接缝...与[MashalAs ...]不同。进行此更改后，它可以正常工作。

 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

public struct BII_Template { public uint id; public uint employee_id; public uint password;

public byte sensor_version;
public byte template_version;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
public byte[] name;
public byte finger;

public byte admin_level;
public byte schedule;
public byte security_thresh;

[MarshalAs(UnmanagedType.ByValArray, SizeConst = 18)]
public byte[] noise_level;
public byte corramb;
public byte reference_x;
public byte reference_y;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] ihcore;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] ivcore;

public byte temp_xoffset;
public byte temp_yoffset;
public byte index;

[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5500)]
public byte[] inphase;

};

Answer 2

我的标准答案：在C＃项目中添加C ++ / CLI程序集。然后问题就会自行解决。

Answer 3

C ++中的'unsigned long'不等于C＃中的ulong。

改用uint。

Answer 4

你需要在BII_Template上使用structlayout.sequal属性，谷歌搜索详情。

如何从C＃解析结构到C ++ DLL？

4 个答案: