|
Hi
I am writing a C# app that talks TCP/IP to a development board. The board has C command struct packets defined below.
#define MAX_PACKET_PAYLOAD 1024
typedef enum packetCmds_enum {
PC_TO_DSP_WRITE = 1,
PC_TO_DSP_READ = 2,
DSP_TO_PC_ACK = 3
}packetCmds_enum;
//@brief This packet is sent from the DSP to the PC as a command.
typedef struct cmdPacket_type {
packetCmds_enum cmd; //< Should be 32 bits
Uint32 size; //< Set to zero if no data
Uint32 addr; //< Target address
Uint8 data[MAX_PACKET_PAYLOAD];
Uint32 checksum; //< Includes cmd, size, addr and data.
} cmdPacket_type;
I started programming it as public struct but then ran into an issue with the Uint8 data array. If I use
byte[] data = new byte[MAX_PACKET_PAYLOAD]
then I won't get the same structure because its an object.
I'm also using the System.NET.socket library to get the packet from the board.
socket.Receive(bytesReceived)
I've learned that I can't typecast bytesReceived to cmdPacket_type, so whats the cleanest way for me to parse the packet?
I also have to send packets to the dev board, but once I understand the conversion between un-managed and managed code (if thats even possible), I should be able to figure it out.
Thanks
Cheers
|
|
|
|
|
Hi,
here is a partial answer for you:
1.
in order to call native (or unmanaged) code from C#, you need P/Invoke. It isn't very simple, however there is a lot of information available, use Google. I have an unfinished article here[^]. Unfortunately for you, structs will be handled in part 2, which isn't available yet.
2.
to mimic native numeric arrays (with a constant size) in a C# struct, you need MarshalAttribute; it may look like:
struct ... {
...
[MarshalAs(UnmanagedType.ByValArray, SizeConst=1024)]
byte[] byteArray;
...
}
|
|
|
|
|
From the information you've supplied, this looks like it should work:
using System.Runtime.InteropServices;
public enum PacketCmds
{
PC_TO_DSP_WRITE = 1,
PC_TO_DSP_READ = 2,
DSP_TO_PC_ACK = 3
}
[StructLayout(LayoutKind.Sequential)]
public struct CmdPacketType
{
public const int MAX_PACKET_PAYLOAD = 1024;
public PacketCmds cmd;
public uint size;
public uint addr;
[MarshalAs(UnmanagedType.ByValArray, ArraySubType=UnmanagedType.U1, SizeConst=MAX_PACKET_PAYLOAD)]
public byte[] data;
public uint checksum;
}
|
|
|
|
|
Instead of PInvoke, I recommend to use a C++/CLI wrapper. Easy to implement and it has less "magic" involved.
|
|
|
|
|
hi guys
i can send file with bluetooth from pc to any phone with inthehand library that phone must be accept recive file
and now how to send file without accepting from phone ?
thanks a lot
|
|
|
|
|
Why do you want to do that? I wouldn't like my phone receiving a file without me knowing about and accepting it. Sounds fishy.
"I love deadlines. I like the whooshing sound they make as they fly by." (DNA)
|
|
|
|
|
thanks for reply
i want to send file from pc to phone with bluetooth without accepting from phone and when send directly send to phone
thanks a lot
|
|
|
|
|
I don't think you can, and even if it is possible, you shouldn't.
|
|
|
|
|
For what I understand, you cannot get around that limitation for, rather obvious, security reasons.
|
|
|
|
|
if you want to send to your own phone, create a solid connection maybe it can do, but i dont want to recieve your files without my "YES".
|
|
|
|
|
i would like to write control like IE-8 address bar - with the option of auto-complete text and with the option of the delete (like the X that appear on the right of each option when doing hover)
how can i add the delete option?
any idea?
Thanks
|
|
|
|
|
You'll need to subclass a ComboBox, set the autocomplete stuff and set the DrawMode to one of the OwnerDraw ones so you can draw the image and override OnDrawItem.
|
|
|
|
|
the droped-down part is more like a listview than an item of combobox, so i think you can try to implement it by a listview, refer to source code of "ObjectListView2008"(google and download it).
|
|
|
|
|
If you're using WPF you can add one of the panels as an item. That panel can contain a textbox and an icon.
Still not easy as there will be some squirks, but it's an idea.
V.
|
|
|
|
|
Hi
How can I draw Line in background of richtextbox ?(something like handwriting notebooks) even in with spaces also.
somthing like this :
1.this is my book ___________________________________________________
2.My Name : _________________________________________________________
3.My Address : ______________________________________________________
|
|
|
|
|
The easiest way probably is by using the underline font style while adding text and/or spaces.
|
|
|
|
|
Yeuch! I hate it when you have to do that, when you change the font size or text all the alignment goes out unless you use a non-proportional font. Which looks tatty. I don't have a better solution (other than "don't do it") but it is still a nasty solution.
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
|
|
|
|
|
I almost never use underline style, and I would expect it not to mess up horizontal alignment (if any) as there is no reason I can think of it would change character widths.
I agree it isn't a really elegant solution, however drawing real lines and get them align somehow with text probably is quite a task.
BTW: I hate forms with full lines where I'm supposed to write, a subtle gray dotted line is much better. I think I left that as homework.
|
|
|
|
|
Please help and give me sample
I need it very much
Thanks\
|
|
|
|
|
I'm not going to provide any code, it is elementary. You can apply underline style in the same way you would apply bold or italics.
I suggest you first experiment inside WordPad to see if what you can obtain is acceptable; then read up on RichTextBox class.
|
|
|
|
|
It will only change character width if you change the font, font size or style, or replace a space with a non-blank character in a proportional font - 'W' is wider than ' ' (and depending on the font you select '.' may be narrower). So in a RichTextBox with
1) 2) the "2)" bit will move left or right if you type over the "1)" entry. Yeuch.
I agree whole heartedly on the lines bit - don't clutter things up!
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
|
|
|
|
|
I think that you didnt get me question(i know underline style).
I wanna something like this ?
<a href="">http:
|
|
|
|
|
the example in your original post seems quite doable in WordPad, and hence with underlining only.
The link you provided now is defective as well as suspiciously long and complex.
|
|
|
|
|
This[^] is a 'proper' link in case you're interested 
|
|
|
|
|
proper it is; is it somehow related to the original question as well?
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
