C结构到C＃映射 [英] C struct to C# mapping
问题描述
我正在尝试使用pinvoke和C＃.Net调用win32函数。
该函数需要一个struct reference作为参数（lpInfo），但在返回时
结构没有填充数据，我怀疑我已经做了一个
错误映射结构。
DBSTAT DBenum（XInt32 hDBase，
LPSTR lpszPath，
XDWORD nLevel ，
DBENUMCB回调，
DWORD用户数据，
LPVOID lpInfo）;
C结构就像这样（截断）：
typedef struct _seginfo {
CHAR名称[ strSHORT + 1];
CHAR描述[strLONG + 1];
DWORD创建;
WORD DClass;
WORD UType;
Int32 Top;
Int32 Bottom;
WORD wPoints;
FLOAT fHStart;
WORD uHUnit;
FLOAT fVScale;
WORD SmpSize; //对于smpFILE =文件大小
//对于smpREGULAR
WORD TixPerSmp;
//对于smpRANGE
XDWORD * lpUpdateCount;
//任何
Int32 lAliasOffset;
} SGMINFO;
strSHORT = 10;
strLONG = 256;
任何人都可以帮我正确的C＃映射吗？
Tor，
任何人都可以帮我正确的C＃映射吗？
我猜它应该看起来像这样
struct SGMINFO
{
[MmshalAs（UnmanagedType.ByValTStr，SizeConst = 11）]
public string名称;
[MmshalAs（UnmanagedType.ByValTStr，SizeConst = 257
公共字符串描述;
public uint创建;
public ushort DClass;
public ushort UType;
public int Top;
public int Bottom;
public ushort wPoints;
public float fHStart;
public ushort uHUnit;
public float fVScale;
public ushort SmpSize;
public ushort TixPerSmp;
public IntPtr lpUpdateCount;
public int lAliasOffset;
}
Mattias
-
Mattias Sj？gren [C＃MVP] mattias @ mvps.org
http：//www.msjogren。 net / dotnet / | http://www.dotnetinterop.com
请回复到新闻组。
嗨马蒂亚斯，
感谢您的回答！
结构是仍然没有填充数据。
我看到.of的sizeof（SGMINFO）i C是255字节，而.Net中的Marshal.SizeOf（
也许这是因为ansi C中的char是1字节，而C＃中的
是2字节？
或者你认为情况并非如此？
问候Tor
" Mattias Sj？gren" <毫安******************** @ mvps.org>在消息中写道
news：uE ************** @ TK2MSFTNGP09.phx.gbl ...Tor，任何人都可以帮我正确的C＃映射吗？
我猜它看起来应该是这样的
struct SGMINFO
{MmshalAs（UnmanagedType.ByValTStr，SizeConst = 11）]
公共字符串名称;
[MmshalAs（UnmanagedType.ByValTStr，SizeConst = 257
public）字符描述;
公共uint创建;
公共ushort DClass;
公共ushort UType;
public int Top;
public int Bottom;
public ushort wPoints ;公共浮动fHStart;
public ushort uHUnit;
public float fVScale;
public ushort SmpSize;
public ushort TixPerSmp;
public IntPtr lpUpdateCount;
public int lAliasOffset;
}
Mattias
-
Mattias Sj？gren [C＃MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
请仅回复新闻组。
" Mattias Sj？gren" <毫安******************** @ mvps.org>在消息中写道
news：uE ************** @ TK2MSFTNGP09.phx.gbl ...Tor，任何人都可以帮我正确的C＃映射吗？
我猜它看起来应该是这样的
struct SGMINFO
{MmshalAs（UnmanagedType.ByValTStr，SizeConst = 11）]
公共字符串名称;
[MmshalAs（UnmanagedType.ByValTStr，SizeConst = 257
public）字符描述;
公共uint创建;
公共ushort DClass;
公共ushort UType;
public int Top;
public int Bottom;
public ushort wPoints ;公共浮动fHStart;
public ushort uHUnit;
public float fVScale;
public ushort SmpSize;
public ushort TixPerSmp;
public IntPtr lpUpdateCount;
public int lAliasOffset;
}
我认为它需要一个StructLayoutAttribute：
[StructLayout（LayoutKind.Sequential， CharSet = CharSet.Ansi）]
Hi,
I''m trying to call a win32 function using pinvoke and C# .Net.
The function takes a struct reference as a parameter (lpInfo), but on return
the struct is not filled with data, and I''m suspecting that I have made a
mistake mapping up the struct.
DBSTAT DBenum ( XInt32 hDBase,
LPSTR lpszPath,
XDWORD nLevel,
DBENUMCB Callback,
DWORD UserData,
LPVOID lpInfo);
The C struct is like this (truncated):
typedef struct _seginfo {
CHAR Name [ strSHORT + 1 ];
CHAR Desc [ strLONG + 1 ];
DWORD Created;
WORD DClass;
WORD UType;
Int32 Top;
Int32 Bottom;
WORD wPoints;
FLOAT fHStart;
WORD uHUnit;
FLOAT fVScale;
WORD SmpSize; // for smpFILE = file size
// for smpREGULAR
WORD TixPerSmp;
// for smpRANGE
XDWORD *lpUpdateCount;
// any
Int32 lAliasOffset;
} SGMINFO;
strSHORT = 10;
strLONG = 256;
Can anyone help me with a correct C# mapping?
解决方案Tor,
Can anyone help me with a correct C# mapping?
I''m guessing it should look something like this
struct SGMINFO
{
[MmshalAs(UnmanagedType.ByValTStr, SizeConst=11)]
public string Name;
[MmshalAs(UnmanagedType.ByValTStr, SizeConst=257
public string Desc;
public uint Created;
public ushort DClass;
public ushort UType;
public int Top;
public int Bottom;
public ushort wPoints;
public float fHStart;
public ushort uHUnit;
public float fVScale;
public ushort SmpSize;
public ushort TixPerSmp;
public IntPtr lpUpdateCount;
public int lAliasOffset;
}
Mattias
--
Mattias Sj?gren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Hi Mattias,
Thanks for your answer!
The struct is still not filled with data.
I see that a sizeof( SGMINFO) i C is 255 bytes, and Marshal.SizeOf(
typeof( SGMINFO )) in .Net is 344 bytes.
Maybe this is due to the fact that a char in ansi C is 1 byte wheras a char
in C# is 2 bytes?
Or do you think this is not the case?
Regards Tor
"Mattias Sj?gren" <ma********************@mvps.org> wrote in message
news:uE**************@TK2MSFTNGP09.phx.gbl...Tor,Can anyone help me with a correct C# mapping?
I''m guessing it should look something like this
struct SGMINFO
{
[MmshalAs(UnmanagedType.ByValTStr, SizeConst=11)]
public string Name;
[MmshalAs(UnmanagedType.ByValTStr, SizeConst=257
public string Desc;
public uint Created;
public ushort DClass;
public ushort UType;
public int Top;
public int Bottom;
public ushort wPoints;
public float fHStart;
public ushort uHUnit;
public float fVScale;
public ushort SmpSize;
public ushort TixPerSmp;
public IntPtr lpUpdateCount;
public int lAliasOffset;
}
Mattias
--
Mattias Sj?gren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
"Mattias Sj?gren" <ma********************@mvps.org> wrote in message
news:uE**************@TK2MSFTNGP09.phx.gbl...Tor,Can anyone help me with a correct C# mapping?
I''m guessing it should look something like this
struct SGMINFO
{
[MmshalAs(UnmanagedType.ByValTStr, SizeConst=11)]
public string Name;
[MmshalAs(UnmanagedType.ByValTStr, SizeConst=257
public string Desc;
public uint Created;
public ushort DClass;
public ushort UType;
public int Top;
public int Bottom;
public ushort wPoints;
public float fHStart;
public ushort uHUnit;
public float fVScale;
public ushort SmpSize;
public ushort TixPerSmp;
public IntPtr lpUpdateCount;
public int lAliasOffset;
}
I think it needs a StructLayoutAttribute:
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
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