Visual Studio 2013 C++. what I am trying to do is, I will ask for a string and extract each letter from that string. (I know it is already char) but I dont know how to extract each letter, and find out number of chars entered. I do not know how to stop the command line window. getchar() only gets one char but the user may enter several chars continuously, like a string. Any idea? Thanks.
int main(int argc, char *argv[]) {
string firstarg;
if (argc < 1)
{
//Check see if str passed
cout << "No string entered....";
}
else
{
firstarg = argv[1];
cout << firstarg;
}
}
Related
I want to show a message before an input :
cout<<"Enter a char:";
ch = getche();
But when running program it does not show the message and getche() works and after that the message is showed !!!
The whole program :
#include <iostream.h>
#include <conio.h>
int main(){
int ch;
cout<<"Enter a char:";
//cin.ignore();
ch = getche();
return 0;
}
The whole problem that, i want to do is this:
1- show a message
2- enter ONLY one char
3- do something immediately after entering the char
Adding endl soleved the problem :
cout<<"Enter a char:"<<endl;
ch = getche();
I'm trying to send the contents of an Intel Hex file over a Serial connection to a microcontroller, which will process each line sent and program them into memory as needed. The processing code expects the lines to be sent as they appear in the Hex file, including the newline characters at the end of each line.
This code is being run in Visual Studio 2013 on a Windows 10 PC; for reference, the microcontroller is an ARM Cortex-M0+ model.
However, the following code doesn't seem to be processing the Intel Hex record file the way that I expected.
...
int count = 0;
char hexchar;
unsigned char Buffer[69]; // 69 is max ascii hex read length for microcontroller
ifstream hexfile("pdu.hex");
while (hexfile.get(hexchar))
{
Buffer[count] = hexchar;
count++;
if (hexchar == '\n')
{
for (int i = 0; i < count; i++)
{
printf("%c", Buffer[i]);
}
serial_tx_function(Buffer); // microcontroller requires unsigned char
count = 0;
}
}
...
Currently, the serial transmission call is commented out, and the for loop is there to verify that the file is being read properly. I expect to see each line of the hex file printed out to the terminal. Instead, I get nothing at all. Any ideas?
EDIT: After further investigation, I determined that the program isn't even entering the while loop because the file fails to open. I don't know why that would be the case, since the file exists and can be opened in other programs like Notepad. However, I'm not terribly experienced with file I/O, so I might be overlooking something.
*.hex files contain non-ascii data a lot of the times that can have issues being printed out on command-line terminals.
I would just say you should try to open the file as a binary and print the characters as hexadecimal numbers.
So make sure you open the file in binary mode with ifstream hexfile("pdu.hex", ifstream::binary); and if you want to print hex characters the printf specifier is %x or %hhx for char.
The whole program would look something like this:
#include <iostream>
#include <fstream>
#include <cassert>
int main()
{
using namespace std;
int count = 0;
char hexchar;
constexpr int MAX_LINE_LENGTH = 69;
unsigned char Buffer[MAX_LINE_LENGTH]; // 69 is max ascii hex read length for microcontroller
ifstream hexfile("pdu.hex",ios::binary);
while (hexfile.get(hexchar))
{
assert(count < MAX_LINE_LENGTH);
Buffer[count] = hexchar;
count++;
if (hexchar == '\n')
{
for (int i = 0; i < count; i++)
{
printf("%hhx ", Buffer[i]);
}
printf("\n");
//serial_tx_function(Buffer); // microcontroller requires unsigned char
count = 0;
}
}
}
Sorry to ask, but I been looking everywhere to find a way to extract the integers from this set of strings:
{(1,2),(1,5),(2,1),(2,3),(3,2),(3,4),(4,3),(4,5),(5,1),(5,4)}
I don't really need the homework done, if you could link me to an example, I'll appreciate it.
thank you in advanced.
If you just want to access the integers from a line like that, one way is to simply continue reading integers while you can.
If, for some reason, you find an integer read failing (because there's a { in the input stream, for example), just skip over that single character and keep going.
Sample code for this is:
#include <iostream>
int main() {
int intVal; // for getting int
char charVal; // for skipping chars
while (true) {
while (! (std::cin >> intVal)) { // while no integer available
std::cin.clear(); // clear fail bit and
if (! (std::cin >> charVal)) { // skip the offending char.
return 0; // if no char left, end of file.
}
}
std::cout << intVal << '\n'; // print int and carry on
}
return 0;
}
A transcript follows:
pax> echo '{(314159,271828),(42,-1)}' | ./testprog
314159
271828
42
-1
Actually the below program is for Dispersal Algorithm called Rabin-IDA; this algorithm divided the data into N pieces and then recombine it from M pieces (such that M<N).
Thus, the below program needs command line arguments,which entering by Project properties/Debugging.
this argument is file name, where the program performing spitted the file into N files, and then recombine it from M divided files, and put it on another file which should also passing its name as argument .
Now my question is, How can i make this program enter the file name by keyboard??(i mean enter the files name by user from screen not as command line arguments)
the below code is just the main function of program, and the whole of it in this link (http://www.juancamilocorena.com/home/projects) Information Dispersal Algorithms Rabin-IDA.
#include "include.h"
void __cdecl _tmain(int argc, TCHAR *argv[])
{
DWORD ini=GetTickCount();
try
{
if( argc == 3 ) //recombine
{
RabinIDA rabin=RabinIDA(17,10);
long long size=GetFileSize(argv[1]);
int f[]={0,2,3,5,6,8,9,11,14,15};
rabin.recombine(argv[1],
f,
argv[2],
size);
}
else if(argc == 2)
{
RabinIDA rabin=RabinIDA(17,10);
rabin.split(argv[1]);
}
else
{
printf("Error. To split a file pass a parameter with the file to be splitted\n");
printf("To recombine the file give the name of the original file and the output file\n");
printf("The name of the file is used to get the size of the original file only, in a production\n");
printf("environment the length of the original file and the id of the share must be stored along with the share");
return;
}
printf("%d\n",GetTickCount()-ini);
}
catch (int)
{
PrintLastError(_T("MAIN CATCH"));
}
}
If you want to get the file name from the console, you can do this:
cout << "Enter file name: ";
string filename;
getline(cin, filename);
It's only every once in awhile that I have to write in c++. My problem is how do you find a character string within a string? Then save that line, and then look for a set of numbers in that line. For example I have a text file that looks like this.
Address Length Name
87623498 2 dog
12345678 4 cat
98737289 1 bird
I want to search for "cat" and then store the numbers associated with it (12345678) and (4) to different variable names. Here is some code I have written, but it's not close to being correct. I have an .exe that calls this DLL. Any help is appreciated!
`
#include
#include
#include
#include
#include
char* File_Path; //Path is sent by another program
char* Name; //value is being sent by another program
unsigned long Address;
int Length;
int found = 0;
{
using namespace std;
std::string Line;
std::ifstream infile;
infile.open (File_Path);
if (infile.is_open())
{
std::ofstream outfile;
outfile.open ("C:\\debug\\test.txt")
while (infile.good() && found == 0)
{
std::getline(infile,Line);
//if (Name is within Line){
/*I want to say IF char* Name = a part of the string line
ie. Name = cat and the string Line is (12345678 4 cat)
Then store the number (12345678 = Address), and
(4 = Length) I hope that makes sense :/
*/
outfile << Line; //output the stored line for debug
outfile << address; //output the stored address for debug
outfile << length; //output the stored length for debug
found = 1;
}
outfile.close();
infile.close();
}
return 0;
}
`
Please help! Thank you!