[英]What is the C# / .net equivalent of writing binary data directly to a struct?
The exact structure of the struct is not important. 结构的确切结构并不重要。
From what I gather the following c code is reading a "chunk" of binary data (equal to the size of the struct) and directly writing that to a struct (ie first 32 bytes to name, next 2 bytes to attrib, etc). 从我收集的内容中,下面的c代码是读取二进制数据的“块”(等于结构的大小)并直接将其写入结构(即前32个字节到名称,接下来2个字节到attrib等)。 Is there any equivelent in C# managed code?
C#托管代码中是否有任何等价物?
Please provide a code snipet showing similar outcome. 请提供显示类似结果的代码snipet。 To save time you can simplify the to only a few elements and assume the appropriate filestream type object is already initialized.
为了节省时间,您可以将只简化为几个元素,并假设已经初始化了相应的文件流类型对象。
Note: I will be consuming an existing legacy data file so the formatting/packing of the existing data file is important. 注意:我将使用现有的遗留数据文件,因此现有数据文件的格式化/打包非常重要。 I can't for example just use .net serialization / deserization because I will be processing legacy existing files (changing format is not feasible).
我不能仅仅使用.net序列化/去除化,因为我将处理遗留的现有文件(改变格式是不可行的)。
typedef struct _PDB
{
char name[32];
unsigned short attrib;
unsigned short version;
unsigned int created;
unsigned int modified;
unsigned int backup;
unsigned int modNum;
unsigned int nextRecordListID;
unsigned short numRecs;
} PDB;
void getFileType(FILE *in)
{
PDB p;
fseek(in, 0, SEEK_SET);
fread(&p, sizeof(p), 1, in);
. . .
}
I think you're asking about the StructLayoutAttribute and the FieldOffsetAttribute . 我想你在询问StructLayoutAttribute和FieldOffsetAttribute 。
Example (snippet) from MSDN site: 来自MSDN站点的示例(代码段):
[StructLayout(LayoutKind.Explicit, Size=16, CharSet=CharSet.Ansi)]
public class MySystemTime
{
[FieldOffset(0)]public ushort wYear;
[FieldOffset(2)]public ushort wMonth;
[FieldOffset(4)]public ushort wDayOfWeek;
[FieldOffset(6)]public ushort wDay;
[FieldOffset(8)]public ushort wHour;
[FieldOffset(10)]public ushort wMinute;
[FieldOffset(12)]public ushort wSecond;
[FieldOffset(14)]public ushort wMilliseconds;
}
Have a look at Marshalling, it is IMHO what you are looking for. 看看编组,恕我直言,你在寻找什么。
This link has an in-depth view of structs in C#: 此链接深入了解C#中的结构:
http://www.developerfusion.com/article/84519/mastering-structs-in-c/ http://www.developerfusion.com/article/84519/mastering-structs-in-c/
Additional info may be found at MSDN's Marshal Class documentation: 其他信息可以在MSDN的Marshal Class文档中找到:
http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.aspx http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.aspx
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