传递结构，其中包含C和C＃之间的结构数组（DLL和P调用） [英] Passing structure containing an array of structures between C and C# (DLL and P invoke)
问题描述
我的C dll具有一些复杂的结构，而我在C＃中确实是一个新手：
I have C dll with some complicated struct and I ma really a newbie in C#:
typedef struct {
int a;
int b;
} simple_struct;
typedef struct {
int d;
int e;
simple_struct f[20];
short g;
simple_struct h[20];
short i;
} complex_struct;
问题是我无法使用这种结构连接C＃应用程序！
The issue is that I am not able to interface my C# application with this structure!!
在DLL中有一个函数GetData（complex_struct * myStruct），我应该从C＃中调用它，所以我创建了：
In the DLL there is a function GetData(complex_struct* myStruct) and I shoud call it from C#, so I created:
[StructLayout(LayoutKind.Sequential, Pack = 1)]
unsafe struct simple_struct {
public int a;
public int b;
} ;
[StructLayout(LayoutKind.Sequential, Pack = 1)]
unsafe struct complex_struct {
public int d;
public int e;
public simple_struct[] f;
public short g;
public simple_struct[] h;
public short i;
} ;
但是问题是当我将complex_struct作为GetData的参数传递时，所有字段都被填回表格我，但不是我的simple_struct这两个数组（我的意思是f和h）！他们的值是空的！
but the problem is that when I pass complex_struct as argument of GetData, all the fields are filled back form me, but not my two array of simple_struct (I mean f and h)!! Their values are null!!
有人可以帮我吗，谢谢
您好，谢谢您的答复，
我已经按照您说的做了，但是当我调用GetData时，我仍然遇到另一个问题，该过程在没有任何消息（一种异常）：
I have done like what you said, but I still have another issue when I call GetData, the process crashes without any message (a kind of Exception):
这是我的C语言代码：
名称空间dll_test_import_c_sharp
{
class Program
{
[StructLayout（LayoutKind.Sequential，Pack = 1）]
struct simple_struct {
public int a;
public int b;
};
This is my C sharp code: namespace dll_test_import_c_sharp { class Program { [StructLayout(LayoutKind.Sequential, Pack = 1)] struct simple_struct { public int a; public int b; } ;
[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct complex_struct {
public int d;
public int e;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public simple_struct[] f;
public short g;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public simple_struct[] h;
public short i;
} ;
[DllImport("test_dll.dll", CharSet = CharSet.Unicode)]
static extern int GetData(ref complex_struct a);
static void Main(string[] args)
{
complex_struct a = new complex_struct();
GetData(ref a);
return;
}
}
}
我有我在GetData上做了很多printf，并且它们都执行得很好，看来'return'指令崩溃了！！
I have done a lot of printf i GetData and all of them are well executed, it seems like the 'return' instruction crashes!!
我试图通过ref或out调用GetData，但它们都不起作用...
I tried to call GetData by ref or by out and both of them don't work...
您好，谢谢您的答复，
我的所作所为与您所说的一样，但是当我遇到其他问题时，调用GetData，进程崩溃而没有任何消息（一种异常）：
I have done like what you said, but I still have another issue when I call GetData, the process crashes without any message (a kind of Exception):
这是我的C语言代码：
命名空间dll_test_import_c_sharp
{
类程序
{
[StructLayout（LayoutKind.Sequential，Pack = 1）]
struct simple_struct {
public int a;
public int b;
};
This is my C sharp code: namespace dll_test_import_c_sharp { class Program { [StructLayout(LayoutKind.Sequential, Pack = 1)] struct simple_struct { public int a; public int b; } ;
[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct complex_struct {
public int d;
public int e;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public simple_struct[] f;
public short g;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public simple_struct[] h;
public short i;
} ;
[DllImport("test_dll.dll", CharSet = CharSet.Unicode)]
static extern int GetData(ref complex_struct a);
static void Main(string[] args)
{
complex_struct a = new complex_struct();
GetData(ref a);
return;
}
}
}
我有在GetData上做了很多printf，并且它们都执行得很好，看来'return'指令崩溃了！！
I have done a lot of printf i GetData and all of them are well executed, it seems like the 'return' instruction crashes!!
我尝试通过ref或out调用GetData，但它们都不起作用...
I tried to call GetData by ref or by out and both of them don't work...
推荐答案
您需要在 struct 上更改数组定义，以指定它是按值/内联数组
You need to change the array definition on the struct to specify that it's a by value / inline array
[StructLayout(LayoutKind.Sequential, Pack = 1)]
unsafe struct complex_struct {
public int d;
public int e;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public simple_struct[] f;
public short g;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public simple_struct[] h;
public short i;
} ;
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