C＃结构和C结构是否相同？需要帮助 [英] Are C# structs and C structs the same? Help needed

问题描述

我正在使用几个接收结构作为参数的C函数（在dll中）。

因为我在C＃中这样做，我假设我需要重新创建结构C＃in

命令用所需参数调用该函数。为了转换如下所示的结构，我需要做什么？
：


typedef struct

{


char rsvd0 [4];

char iadl1 [50 + 1];

char iadl2 [50 + 1];

char ictyi [50 + 1];


struct {//嵌套结构

char a;

char b;

char c;

} foot;


ADSR_REC堆栈[10];

char rsvd4 [194];

} DIR_PARM;


进入C＃结构？我已经能够通过我的

应用程序（通过DllImport）调用没有参数的函数但是我在调​​用函数时遇到了麻烦

需要这个结构作为参数。并且真实的结构是在Header文件中声明的我无法访问的
（使用#include）。如果我用C / C ++做程序，我只需要包含这个头文件，并且

参数必须指向结构。我将如何访问DIR_PARM.foot.a

？


任何帮助都将不胜感激。

I''m using several C functions (in a dll) that receive a struct as parameter.
Since I''m doing it in C#, I assume I need to recreate the struct in C# in
order to call the function with the required parameter. What would I need
to do in order to convert a struct that looks like this:

typedef struct
{

char rsvd0[4];
char iadl1[50+1];
char iadl2[50+1];
char ictyi[50+1];

struct { //nested struct
char a;
char b;
char c;
} foot;

ADSR_REC stack[10];
char rsvd4[194];
} DIR_PARM;

into a C# struct? I''m already able to call functions w/o parameters from my
application (through DllImport) but I''m having trouble calling a function
that requires this struct as parameter. And the "real" structure is
declared in Header file that I can''t access (with #include). If I were doing
the program in C/C++ I would only need to include this header file and the
argument has to point to the struct. And how would I access DIR_PARM.foot.a
?

Any help would be appreciated.

推荐答案

假设char是Ansi 8位...


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

public struct DIR_PARM

{

[MarshalAs（UnmanagedType.ByValTStr，SizeConst = 4）]

public char rsvd;

[MarshalAs（UnmanagedType.ByValTStr，SizeConst = 51）]

public char iadl1;

.....

公共脚页脚;

???需要知道ADSR_REC的类型

}


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

struct foot

{

char a;

char b;

char c;

}

Willy。


" Angel" <无>在消息中写道

新闻：OJ ************** @ tk2msftngp13.phx.gbl ...

Assuming char is Ansi 8 bit...

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct DIR_PARM
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=4)]
public char rsvd;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=51)]
public char iadl1;
.....
public foot footer;
??? need to know the type of ADSR_REC
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
struct foot
{
char a;
char b;
char c;
}
Willy.

"Angel" <none> wrote in message
news:OJ**************@tk2msftngp13.phx.gbl...

我正在使用接收结构作为
参数的几个C函数（在一个dll中）。
因为我在C＃中这样做，我假设我需要在C＃中重新创建结构。使用所需参数调用该函数。我需要做什么才能转换如下所示的结构：

typedef struct
{/ /
char rsvd0 [4];
char iadl1 [50 + 1];
char iadl2 [50 + 1];
char ictyi [50 + 1];

struct {//嵌套struct
char a;
char b;
char c;
} foot;

ADSR_REC stack [10];
char rsvd4 [194 ];
} DIR_PARM;

进入C＃结构？我已经能够通过
我的
应用程序调用函数（通过DllImport），但是我在调​​用一个需要这个结构作为参数的函数时遇到了麻烦。并且真实的在Header文件中声明了我无法访问的结构（使用#include）。如果我用C / C ++编写程序，我只需要包含这个头文件，而
参数必须指向struct。我将如何访问
DIR_PARM.foot.a


任何帮助将不胜感激。

I''m using several C functions (in a dll) that receive a struct as
parameter.
Since I''m doing it in C#, I assume I need to recreate the struct in C# in
order to call the function with the required parameter. What would I need
to do in order to convert a struct that looks like this:

typedef struct
{

char rsvd0[4];
char iadl1[50+1];
char iadl2[50+1];
char ictyi[50+1];

struct { //nested struct
char a;
char b;
char c;
} foot;

ADSR_REC stack[10];
char rsvd4[194];
} DIR_PARM;

into a C# struct? I''m already able to call functions w/o parameters from
my
application (through DllImport) but I''m having trouble calling a function
that requires this struct as parameter. And the "real" structure is
declared in Header file that I can''t access (with #include). If I were
doing
the program in C/C++ I would only need to include this header file and the
argument has to point to the struct. And how would I access
DIR_PARM.foot.a
?

Any help would be appreciated.

为什么要将嵌套结构声明为公共页脚？怎么会

我访问这个结构的成员？


ADSR_REC是另一种结构。


再次感谢。

" Willy Denoyette [MVP]" <无线************* @ pandora.be>在消息中写道

news：uL ************** @ tk2msftngp13.phx.gbl ...

Why do you declare the nested struct as public foot footer? And how would
I access the members of this structure?

ADSR_REC is another structure.

Thanks again.
"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:uL**************@tk2msftngp13.phx.gbl...

假设char是Ansi 8位...

[StructLayout（LayoutKind.Sequential，CharSet = CharSet.Ansi）]
公共结构DIR_PARM
{
[MarshalAs（UnmanagedType.ByValTStr，SizeConst） = 4）]
public char rsvd;
[MarshalAs（UnmanagedType.ByValTStr，SizeConst = 51）]
公共字母iadl1;
....
公共脚页脚;
???需要知道ADSR_REC的类型


[StructLayout（LayoutKind.Sequential，CharSet = CharSet.Ansi）]
struct foot
{
char a;
char b;
char c;
}

Willy。

天使 <无>在消息中写道
新闻：OJ ************** @ tk2msftngp13.phx.gbl ...

Assuming char is Ansi 8 bit...

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct DIR_PARM
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=4)]
public char rsvd;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=51)]
public char iadl1;
....
public foot footer;
??? need to know the type of ADSR_REC
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
struct foot
{
char a;
char b;
char c;
}
Willy.

"Angel" <none> wrote in message
news:OJ**************@tk2msftngp13.phx.gbl...

我正在使用几个C函数（在接收结构作为
参数的dll中。
因为我在C＃中这样做，我假设我需要在C＃
中重新创建结构以便调用该函数必需的参数。为了转换看起来像这样的结构，我需要做什么？b $ b：

typedef struct


char rsvd0 [4];
char iadl1 [50 + 1];
char iadl2 [50 + 1];
char ictyi [50 + 1];

struct {//嵌套struct
char a;
char b;
char c;
} foot;

ADSR_REC stack [10];
char rsvd4 [194 ];
} DIR_PARM;

进入C＃结构？我已经能够通过我的
应用程序（通过DllImport）调用没有参数的函数，但是我在调​​用需要这个结构作为参数的
函数时遇到了麻烦。并且真实的在Header文件中声明了我无法访问的结构（使用#include）。如果我用C / C ++做程序，我只需要包含这个头文件和
参数必须指向结构。我将如何访问
DIR_PARM.foot.a


任何帮助将不胜感激。

I''m using several C functions (in a dll) that receive a struct as
parameter.
Since I''m doing it in C#, I assume I need to recreate the struct in C# in order to call the function with the required parameter. What would I need to do in order to convert a struct that looks like this:

typedef struct
{

char rsvd0[4];
char iadl1[50+1];
char iadl2[50+1];
char ictyi[50+1];

struct { //nested struct
char a;
char b;
char c;
} foot;

ADSR_REC stack[10];
char rsvd4[194];
} DIR_PARM;

into a C# struct? I''m already able to call functions w/o parameters from
my
application (through DllImport) but I''m having trouble calling a function that requires this struct as parameter. And the "real" structure is
declared in Header file that I can''t access (with #include). If I were
doing
the program in C/C++ I would only need to include this header file and the argument has to point to the struct. And how would I access
DIR_PARM.foot.a
?

Any help would be appreciated.

在C ++中，struct和class是相同的，除了默认访问级别

类中的成员是私有的并且在结构中它们' '公开。


在C＃中，结构和类之间存在很多差异。在C＃中：


1：结构是值类型，类是引用类型

2：结构不支持继承

3 ：structs总是有一个默认的，无参数的构造函数，不能替换
。

4：使用结构，你可以指定字段的布局方式记忆


（此列表c / o专业C＃，第2版）


另外，我相信，虽然我不确定，结构的成员

默认使用C＃进行私人访问。


Pete


-
http://www.petedavis.net

" ;天使" <无>在消息中写道

新闻：OJ ************** @ tk2msftngp13.phx.gbl ...

In C++, struct and class are the same except that the default access level
of members in a class are private and in a struct they''re public.

In C#, there are a lot more differences between a struct and a class. In C#:

1: structs are value types, classes are reference types
2: structs do not support inheritance
3: structs always have a default, no-parameter constructor, that can''t be
replaced.
4: with structs, you can specify how fields are laid out in memory

(this list c/o Professional C#, 2nd edition)

In addition, I believe, though I''m not sure, that members of a struct
default to private access in C#.

Pete

--
http://www.petedavis.net
"Angel" <none> wrote in message
news:OJ**************@tk2msftngp13.phx.gbl...

我正在使用接收结构为
参数的几个C函数（在dll中）。因为我在C＃中这样做，所以我假设我需要在C＃中重新创建结构，以便用所需的参数调用该函数。我需要做什么才能转换如下所示的结构：

typedef struct
{/ /
char rsvd0 [4];
char iadl1 [50 + 1];
char iadl2 [50 + 1];
char ictyi [50 + 1];

struct {//嵌套struct
char a;
char b;
char c;
} foot;

ADSR_REC stack [10];
char rsvd4 [194 ];
} DIR_PARM;

进入C＃结构？我已经能够从
我的应用程序（通过DllImport）调用没有参数的函数，但是我在调​​用一个需要这个结构作为参数的函数时遇到了麻烦。并且真实的在Header文件中声明了我无法访问的结构（使用#include）。如果我用$ C $ b在C / C ++中编写程序，我只需要包含这个头文件，而
参数必须指向struct。我将如何访问
DIR_PARM.foot.a？

任何帮助将不胜感激。

I''m using several C functions (in a dll) that receive a struct as parameter. Since I''m doing it in C#, I assume I need to recreate the struct in C# in
order to call the function with the required parameter. What would I need
to do in order to convert a struct that looks like this:

typedef struct
{

char rsvd0[4];
char iadl1[50+1];
char iadl2[50+1];
char ictyi[50+1];

struct { //nested struct
char a;
char b;
char c;
} foot;

ADSR_REC stack[10];
char rsvd4[194];
} DIR_PARM;

into a C# struct? I''m already able to call functions w/o parameters from my application (through DllImport) but I''m having trouble calling a function
that requires this struct as parameter. And the "real" structure is
declared in Header file that I can''t access (with #include). If I were doing the program in C/C++ I would only need to include this header file and the
argument has to point to the struct. And how would I access DIR_PARM.foot.a ?

Any help would be appreciated.

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