Wondering why I cannot communicate with my microcontroller dspic33 with the Hyperterminal program. In the sample test code, I also cannot use printf. They have it set up differently and I am wondering if it is possible to redirect the output of the printf, scanf functions to the port I am using?
View 3 Repliesi have tried to search on the Internet but haven't found a suitable result that links in with what I want to do, that is to creation a WPF application and when you press a enable button it will enable the LAN and when I click the disable button it will disable the LAN until i click the enable button again. Now I know how to creation a WPF and the buttons, but how would I do the disabling LAN and enabling LAN?
By LAN i mean just the networking adapters, so that the PC cannot connect to a router and then the Internet.
I have my application database in the AppDataRoaming folder. I'm trying to create a connection string for Telerik reporting, up until now I've had a connection string in a settings class that is put together like this:
The path is:
data source=C:UsersSynlightAppDataRoamingAppNamedataAppDB.sqlite
I've tried files paths like this:
%AppData%RoamingAppDatadataAppDB.sqlite
and
Server.MapPath(@"~App_DataRoamingAppDatadataAppDB.sqlite
(those are not the real directory names, of course). How do I create a connection string that will work on target machines?
I am currently writing a small windos form app which relies on an internat connection.
The only issue I have is trying to find out how to force the app to reconnect if the internet drops out without the app crashing. From what I have read I could use "try and catch" but I am not sure how to do this.
The code I have so far is: for testing I am using [URL] as the web site target.
Form1.Designer:
namespace Browser2014
{
partial class Form1
{
[Code]....
private DataSet1 GetData(string query) {
string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
The above is erring out with NullReferenceException
I'm getting this error.
SQLite error
near "16": syntax error
On the code:
private void btnUpdate_Click(object sender, EventArgs e)
{
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
[Code]....
With breapoints etc it does show the values it has to insert into my database. But it just doesn't and gives me the Near "16" syntax error.
how to give a database connection to a c++ code i am using turbo c++ as an editor and if i have oracle 11g client, odbc as a driver , what else i require and how to link these things in a code.
View 1 Replies View RelatedI have issues with this i am new to winsock. so i was learning to use winsock for http POST request
Compiles correctly, but doesnt connect i get the error "Connection Failure" what do you think can be wrong
My code goes like this:
Code: #define WIN32_LEAN_AND_MEAN
#include "stdafx.h"
#include <cstdio>
#include <cstdlib>
#include <Winsock2.h>
[Code] .....
I am designing a server program in C++ and now that everything works for the clients, I would like to implement a command line. The code waits for a connection with the predefined function "new_socket = accept(serversocket,(struct sockaddr *)&client,&addrsize);". I already made a function for the command line but I can't find a way (in my brain or on the web) to accept commands (getline) whilst no connection is accepted yet. (I mean wait for a connection. If no connection, then be ready to receive some arguments from the command line). Here is part of the code:
cout << "Waiting for connection/command...";
command_line_function(); //getline(cin,string)
while(true){
new_socket = accept(serversocket,(struct sockaddr *)&client,&addrsize);
if(new_socket == INVALID_SOCKET){ //INVALID_SOCKET is an error somehow.
error_function();}
cout << "ACCEPTED
";
//etc.
}
I am currently developing a sync module using asp.net. I am getting data from an external database (mysql database) The problem is I am getting the error "Connection unexpectedly terminated" when filling the dataset.
Here's my code
string P_contact = "SELECT A.id, B.firstname, B.middlename, B.lastname FROM Accounts A, Contacts B WHERE A.id = B.id";
MySqlDataAdapter db_P_contact = new MySqlDataAdapter(P_contact, conn);
DataSet ds3 = new DataSet();
DataTable dt3 = new DataTable();
[Code] ....
I am getting the exception on this line of code:
db_P_contact.Fill(ds3, "P_contact");
I want to connect an access database (.mdb) to my Windows Forms application - this I can do and I have no problems viewing my table in server explorer.
Some code example or template that I can use as a base to learn from - I have literally trawled Google and Youtube and cannot find what I am after.
What I want to do is have a basic form, 2 text boxes and a button to save the data to my database.
FirstName and LastName are the 2 boxes.
So when I create the EF and use generate model from the database, I included the sensitive info into the connection string. Now I want to get the user to input password, userID, schema name, host into the connection string. I use Oracle as my database, so there is a need to put the schema name in it also.... How do I accomplish this task? Been trying to get it work but unsuccessful so far...
View 3 Replies View RelatedI have a problem with my C#. Trying to create the airstrip with planes heading out of the hangars and on to the road to the airstrip. Each Hangar pannel is connected with closes road to them. What i am stuck with right now is connecting the roads together so each one of them will see if the next road is free and if it is it will send the plane (colorder square for now) to it and then proceed to the next one when finaly they will line up for the final panel(airstrip) and take off.So far they are just going down the each road they are assigned with semaphore and thread.
using System;
using System.Windows.Forms;
using System.Threading;
using System.ComponentModel;
using System.Collections;
using System.Data;
using System.Drawing;
[Code] ....
Connecting the "p2" with "p5" so the graphics from "p1" the square will travel through P2 and P5 this would be great and will allow me to procede with my studies.
Also i do realise that this might not be the best ways of using concurrent Csharp and not the up to date one but this is what i have been assigned with and do not have any other options unfortunately.
How i understand this is that i need to have 3 buffers and 3 semaphores for each panel. But i do not know how to add those to each one of them and then connect it with the next one as if i try and add them it either puts a cross in the design view over that panel or says that there is limited options for this statement.
This is the way that i want to do it unfortunately it must be so. The most flexible this can be is by adding an array for semaphores and buffer ( do not know how to do that either).
I was created winform application with sql data base, after i created it i was converted to the installer file,for the other users but when they run the application did not connect to the database, how i fix this stuff...?
View 1 Replies View RelatedI'm strugling to understand why my app is crashing if there is no internet connection.
Code:
int main() {
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
std::cout << "WSAStartup failed.
[Code] ....
Debug crash code:
Code:
First-chance exception at 0x00161831 in ConsoleApplication1.exe: 0xC0000005: Access violation reading location 0x0000000C.
Unhandled exception at 0x00161831 in ConsoleApplication1.exe: 0xC0000005: Access violation reading location 0x0000000C.
It works well as long as the computer is connected to internet but if i disconect from internet the application crash but don't understand why.
I want make connection between access 2013 and visual studio 2010(c#) but the error below is displaying
View 7 Replies View RelatedI have tried to connect my sql server 2005 using a domain name. i have bought a domain name and a dns client. this is my connection string
{ SqlConnection sqlconn =
new SqlConnection("user id=user1;" + "password=pass2;"
+ "server=www.mysite.infoServerInstance;"
+ "trusted_Connection=false;" + "network
library=DBMSSOCN;" + "Integrated security=false;"
+ "initial catalog=Mydatabase;" +"connection timeout=5
;"); }
I have added sql browser & sql server in fire wall, and also enabled tcp port 1433 and udp port 1434. the above connection string works perfect when i run it in the server machine, but whenIi try to run it on other machines I am getting an error that server is not available or cannot find the specified server.. I desperately need to access my database through an url. ie., through internet..
I read correctly in MatLab some data by serial port of a device, but in C... nothing.
Code: #include <cstdlib>
#include <stdio.h>
int main(void)
{
FILE *in;
char linha[30];
while(1)
{
// Abrir porta COM de onde se ligou a placa
in = fopen( "COM8", "r" );
if( in == NULL )
{
[code].....
The message "ERRO: no consigo abrir porta COM " don't appear, so I haven't error there. I just do not see anything in the terminal.
I have to communicate between two laptops using USB-to-Serial adapter. I have written 2 programs one for sending and another for receiving. Programs were written in both C and C# programming languages.
Using C language: I am able to successfully communicate using C-Programs mentioned below. But the problem is speed. It takes around 1 hour(60min) for just to pass 150MB. improving the performance of this programs...I also mention some comments along with programs for self understanding.Sender File on laptop with serial port :
Code:
#include <stdio.h>
#include <bios.h>
#include <conio.h>
}
[code]....
The above 4 programs behaves as, sender send a character and receives an ack for every character. I have followed this approach, bcoz other approaches were not working fine (in the sense the complete data is not sent, the amount of data sent is not judgeable, bcoz it will different every tym). when i used this approach it worked fine.
I want to read a file who contain a serial of number like in this example : +200,-100,+400,+200,-200 and the sign is very important for the rest of the program so i should save those signed numbers in an array or a struct that i can define with a boolen variable if it's + i give it 1 else if it's - it'll be 0
I wrote a basic file's code reader but i don't think there is a solution on it
Code:
void read_file(char *fil1){
FILE *f;
int ch[500];
f=fopen(fil1,"rt");
if(f==NULL)
[Code] .....
I am trying to make a project using arduino to control several power surces by time, i don't want to have an lcd, that would be easyer but i don't have enought space on my project, i want to set the time and the timing for the relays via Serial
Of curse i could set it using the serial monitor on the arduino ide, but i want to make a simple program to make the pc comunicate with the arduino and make it simpler to set the time and similar stuff. How to use one of my usb ports to print and read serial data?
I am trying to convert decimal value 1 to 32 to hex value and insert it at 4th pos of char array and send it as hex value at the serial port .
My issue is it is converting to decimal to hex value but when it sends, it treat the converted hex value as char and sends it equivalent hex value.
For example
if decimal =1 then its hex = 1.
so , writebuffer[3] =1
But when we send whole writebuffer through send function, it treat this 1 as char and sends its hex value as 31. how to send its hex value.
unsigned int i=0;
char hex[3];
unsigned char hexunsigned[3];
unsigned int dec;
do {
unsigned char writebuffer[8] ={0x01, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
[Code] ....
The send function is
void serial::send(unsigned char data[], DWORD noOfByte) {
DWORD dwBytesWrite;
WriteFile(serialHandle, data, noOfByte, &dwBytesWrite, NULL);
}
how to use this function:
ftStatus = myFtdiDevice.Read(readData, numBytesAvailable,ref numBytesRead);
to read byte from the serial port.This function is part of the DLL that came with the chip(FT2232D) I am using on my board.I want to use the function to read a byte from the serial port and then send the value to the Graphic user interface.Unfortunately I was unable to get the expected value on my GUI.If I send for instance 40,what I get on the GUI are letters instead of the number 40 or at times the GUI will not even respond.Below are my lines of code I used to read the byte from the serial port:
The following instructions are executed whenever the CHECKBOX is checked
private
void checkBox1_CheckedChanged(object sender, EventArgs e)
{
UInt32 numBytesRead = 0;
[Code].....
I am using libserial library to communicate through the serial port in c++. the linux cpu is communicating with a modem through the serial port. basically this is what i want to do
Code:
//I want:
cpu to write command_1 to modem
Wait for the answer from modem
read serial port
check if command successful (i.e modem sends OK if successful and ERROR if there is an error)
If there is an error, resend command_1
if successful then Write command_2 to modem Wait for answer read again serial port check if command is succesful (modem again sends OK if successful and ERROR if there is an error) basically, this is the code...
Code:
serial_port <<command_1 <<'
'; //send 1st command
sleep(2); //delay a while
[Code].....
I have a Voltage Range from -10V up to +10V, which I transform to a voltage Range 0V to 5V, with the schematic i've attached, so I can use the A/D converter of my ATMEGA32 processor.
Now I'd like to write the value of the Input Voltage (which moves in the Range of -10V to + 10V) on the serial port, but i don't know how i should calculate this factor. At the moment, I can only write the value of the A/D Converter Input on the serial, but this is only 0V to 5V...
Explain me a working code to read and write a file using serial communication.and i need to store that file.I know normal file handling in C, but how it is through serial port i am not getting.
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