|
dev
newsgroups
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
Marshal single/float typesI have to deal a lot with serial data exchange between a .NET (1.1) application running on a PC on one side and controler based devices programmed in plain C on the other. The latter expect data as a stream of bytes, extracting numerical values or char[] by 'counting and casting' (e.g. int n = *(int*)&data[0], byte b = *(byte*)&data[4]) (Very old fashioned, but still real) For 'simple' types like char[] or the various int types I use Marshal.Read / Write....() methods to write the values into and back out of a byte[] exchanged between the machines, but I didn't find a way to to access the mere 4 bytes representing the value of a System.Single (==float) struct. I stumbled over the Marshal.Copy() method, but this expects an 'unmanaged destination', whereas byte[] is managed and therefore not accepted. Maybe there is a more simple approach I can't see? Thanks for any help, nojo -- Message posted via DotNetMonster.com http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-new-users/200608/1 Something like this?
public static FloatType Encode(float f) { return BitConverter.ToUInt32(BitConverter.GetBytes(f), 0); } public static float Decode(FloatType enc) { return BitConverter.ToSingle(BitConverter.GetBytes(enc), 0); } "nojo(k)e via DotNetMonster.com" <u15542@uwe> wrote in message news:658f4ee04d757@uwe...Show quote > Hi all, > > I have to deal a lot with serial data exchange between a .NET (1.1) > application running on a PC on one side and controler based devices > programmed in plain C on the other. The latter expect data as a stream of > bytes, extracting numerical values or char[] by 'counting and casting' > (e.g. int n = *(int*)&data[0], byte b = *(byte*)&data[4]) (Very old > fashioned, but still real) > > For 'simple' types like char[] or the various int types I use Marshal.Read > / > Write....() methods to write the values into and back out of a byte[] > exchanged between the machines, but I didn't find a way to to access the > mere 4 bytes representing the value of a System.Single (==float) struct. > > I stumbled over the Marshal.Copy() method, but this expects an 'unmanaged > destination', whereas byte[] is managed and therefore not accepted. > > Maybe there is a more simple approach I can't see? > > Thanks for any help, > > nojo > > -- > Message posted via DotNetMonster.com > http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-new-users/200608/1 > Thanks Ben,
thats what I was looking for. nojo -- Message posted via DotNetMonster.com http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-new-users/200609/1  |
|||||||||||||||||||||||
Other interesting topics