我正在尝试将旧的binary files
应用转换为packed records
。它通过我在BInfoRec
写的record
来做一些事情。但是,只有FileStream.Read
packed records
保证在文件中并首先显示。其他人可能会或可能不会在那里,他们的顺序是未知的。我特别难以使用一种方法。它通过if
获取正在读取的字节数,并将其读入StartP = packed record
x:SmallInt;
y:SmallInt;
end;
InfoP = packed record
Ycoord:double;
Xcoord:double;
//other vars here
end;
HeadP = packed record
NumP:DWORD;
SizeStruct:DWORD;
SizePoStruct:DWORD;
//other vars here
end;
BInfoRec = packed record
StructNum : WORD ;
in_size : WORD ;
//other variables here
end;
var
tStream:TFileStream;
bInfo:BInfoRec;
RestOfBFile:Pointer;
sizeofRest:Integer;
Function LoadBFile(FileName:String):Boolean;
var
sizeread:Integer;
begin
Try
LoadBFile:=False;
tStream:=TFileStream.Create(Filename,fmOpenRead );
sizeofRest:=tStream.Size-Sizeof(bInfo);
sizeread:=tStream.Read(bInfo,Sizeof(bInfo));
if sizeread = Sizeof(bInfo) then
begin //best way to convert this?
RestOfBFile:=AllocMem(sizeofRest);
sizeread:=tStream.Read(RestOfBFile^,sizeofRest);
if SizeofRest= SizeRead then
LoadBFile:=True;
end;
tStream.Free;
except
LoadBFile:=False;
tStream.Free;
end;
end;
之一。然后,在第一个[Serializable()]
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct StartP
{
public short x;
public short y;
}
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct InfoP
{
public double Ycoord;
public double Xcoord;
//other vars here
}
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct HeadP
{
public UInt32 NumP;
public UInt32 SizeStruct;
public UInt32 SizePoStruct;
//other vars here
}
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct BInfoRec
{
public ushort StructNum;
public ushort in_size;
}
BInfoRec bInfo;
int sizeOfRest;
private Boolean LoadBFile(string fileName)
{
int sizeRead;
byte[] buffer = new byte[Marshal.SizeOf(bInfo)];
try
{
using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None))
{
sizeOfRest = (int)stream.Length - Marshal.SizeOf(typeof(BInfoRec));
sizeRead = stream.Read(buffer, 0, Marshal.SizeOf(typeof(BInfoRec)));
if (sizeRead == Marshal.SizeOf(typeof(BInfoRec)))
{
//what goes here??
if (sizeOfRest == sizeRead)
{
return true;
}
}
}
}
catch (Exception ex)
{
return false;
}
}
语句中(在delphi版本中),它在堆上分配内存,并执行与以前相同的操作,但将其读入指针。我试图找出解决这个问题的最佳方法,但我并不是Delphi的专家。
德尔福代码:
BinaryReader
C#(我到目前为止):
list-style
我正在考虑创建一个未知大小的新字节数组,并使用display:inline-block
将该文件的其余部分读入该数组,然后只检查其大小。不确定它是否是最佳方式?
答案 0 :(得分:1)
它是任意大小的内存块。我没有看到你有很多选项,而不是字节数组。是的,您可以分配非托管内存(例如使用Marshal.AllocHGlobal
),但这很不方便。
所以,是的,如果我是你,我会分配一个字节数组,并将内容读入其中。