my file structure for executing a .exe is something like this
c:\Documents and settings\Desktop\Release\abc.exe
i want to execute this from other c++ program in vb c++ after building, it generates an error that c:\Document is not external or internal command
few lines of code are as follows:
#include<stdlib.h>
#include<stdio.h>
int main( void ) {
int result;
result=system("c:\\Documents and settings\\Desktop\\Release\\abc.exe");
getchar();
return 0;
}
As I suspected when writing an earlier comment, the way to do it is to wrap the entire string in double-quotes. 'Escaping the spaces' sounds non-sensical to me. 25 seconds of googling and I don't see (nor have I heard of in over 20 years) an escape-sequence for a space character in C.
The solution is indeed to include quotes in the string - not to just wrap the string in a single pair of them, as you've done. The following will do the trick:
#include <stdlib.h>
#include <stdio.h>
int main()
{
int result;
result = system("\"c:\\Documents and settings\\Desktop\\Release\\abc.exe\"");
getchar();
return 0;
}
However, that said - you shouldn't really be using the system call for this job. Since you're on a windows machine, you should use the ShellExecute function instead. There are many reasons for this, which I wont go into here, you can look them up yourself. But suffice to say it's an infinitely better way to invoke another program.
More on ShellExecute: http://msdn.microsoft.com/en-us/library/windows/desktop/bb762153(v=vs.85).aspx
Related
Hi I am new to C++ and Code::Block
I am trying to make a simple code to test it, using strings.
when I compile the code there is no problem, but when I try to debug it, Code::Block gives me the following warning:
Cannot open file:
File:../../../../../src/gcc-4.9.2/libgcc/unwind-sjlj.c
Info: "Multiple information windows with the same message have been
supressed."
Image of the error FYI:
Part of the code that gives me an error.
inside main function
#include <iostream>
#include <string>
int main ()
{
std::mystring("What's wrong with strings");
return 0;
}
I realise that this error only occurs when I try to debug a string or a file containing a string.
Any help would be appreciated.
some other information that might help:
Code::Block 16.01
Compiler MinGW gcc4.9.2
Windows 7 Professional 32 bits SP1
First of all, to use strings you must include the file header string. And the name of the type string is..std::string, not std::mystring.
#include <string>
int main(int argc, char** argv)
{
std::string mystring("Nothing's wrong with strings");
return 0;
}
#include <iostream>
using namespace std;
int main ()
{
string mystring = "Whats wrong with my string";
return 0;
}
If you write it in the following way, it should work.
It's safer to define strings like I showed it. It will be also easier for you if you add using namespace std in the beginning of every program if you are new to C++.
When I try using cout, it outputs a random number rather then the sentence I want. There is not compiler error, the program runs fine.
Here is my code:
//question.h
#ifndef _QUESTION_H_
#define _QUESTION_H_
using namespace std;
int first()
{
cout<<"question \n";
return 0;
}
#endif
//main.cpp
#include <iostream>
#include "question.h"
using namespace std;
void main(){
cout<<""<<first<<""<<endl;
cin.ignore();
cin.get();
}
I'm fairly new to writing my own header files, so I'm not sure if I did something wrong with that or if there's a problem with visual studio.
You're printing the address of the function. You need to call it:
cout<<""<<first()<<""<<endl;
^^
As mentioned in the comments, this doesn't have to output what you expect, either. The order in which arguments to functions (and that is just a bunch of function calls) is unspecified, so your function output could be in any position the compiler chooses. To fix this, put separate statements:
cout<<"";
cout<<first(); //evaluated, so output inside first() printed before return value
cout<<""<<endl;
It might not matter with the empty strings, but it will when you replace those with something visible.
Also, don't use void main. Use int main() or int main(int, char**) (see here). Don't use using namespace std;, especially in headers, as std has a lot of crap in it that is pulled in with that statement, leading to easy and confusing conflicts (see here). Finally, choose a name that does not conflict with identifiers reserved for the implementation as your include guard.
You are printing the address of the function first rather than calling it. But changing the function call won't fix your problem all by itself, because first writes to cout internally and then returns a number, which will be printed, which doesn't appear to be what you want.
If you want first to act like an <iomanip> thingie you have to jump through a few more hoops -- read that header to see how it's done.
Use cout<<""<<first()<<""<<endl; you need to actually call the function, not print its address
I have a program that reads in a file. All my classes compile fine, but there seems to be an error when I read in the file. Eclipse shows an empty string is being read in (""), which is not what I want.
I have the code for my main below with a while loop. I placed the loop just to see how it would run when debugging, and it runs an infinite loop since it is always reading in "", and never reaches end of file. I have put the file in the working directory and every other folder just to be sure, but it is always doing this even though the file is full of strings and integers. Is there anything I am doing wrong here?
#include "Translator.h"
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
ifstream readFile;
readFile.open("sample.html");
while (!readFile.eof()) // for debugging purposes only
{
string x;
readFile >> x; // x is "" everytime through the loop
readFile >> x; // x is also ""
}
Translator t(readFile);
readFile.close();
return 0;
}
My guess is that your file did not actually open, and the eof bit was therefore not set. You never test whether the file was opened successfully. It could be that your working directory is not what you think it is, or the file is locked by another process (perhaps open in a text editor).
Officially, you can test readFile.fail() after you try opening.
I've found that checking readFile.good() is fine too - in fact you can use that as your loop condition.
I prefer the positive message of 'good' in my code, rather than the potentially upsetting 'fail'.
You should also test your stream as WhozCraig suggested in comments, when you are reading data. You cannot assume that the operation was successful. If it fails for reasons other than EOF, you need to know.
For these reasons, don't use readFile.eof() as your loop condition.
I have a Visual Studio 2008 C++ project for Windows CE 5 where I would like the currently running executable to modify itself.
Specifically, I would like to be able to read/write some data stored within the exe file itself. I do not need (or wish to) modify executable code.
In regular windows, I could use a string resource and the UpdateResource function, but that doesn't exist in WinCE.
CreateFile, unfortunately, fails because the file is already in use.
Does anybody have any other suggestions?
First, why do you need to do this? You should be able to do this with other methods.
I'm not particularly familiar with Windows-CE, but if you need to, you can probably copy the file, edit the copy, delete the first, and then run the other. That's an inefficient way, but if you only need to do it once or twice in the span of the program and speed isn't a concern, I guess you could do it:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(int argc, char * argv[]) {
// Check if this IS the copy:
if (argv[0].find(argv[1]) != string::npos) {
system("taskkill -IM myOLDfile.exe"); // Stop the old one running,
system("del myOLDfile.exe"); // Then delete it.
}
ifstream myself(argv[0]); // argv[0] is the program itself
string fullcode;
string line;
if (file.is_open()) {
while (file.good()) {
getline(myself, line);
line.append("\n");
fullcode.append(line);
}
}
myself.close();
// Do whatever you need to do to the code here.
ofstream newcode("myNEWfile.exe");
newcode.write(fullcode);
newcode.close();
system("myNEWfile.exe myNEWfile.exe"); // Starts new file. Also, not a typo.
}
Good luck on your project!
I know there's been a handful of questions regarding std::ifstream::open(), but the answers didn't solve my problem. Most of them were specific to Win32, and I'm using SDL, not touching any OS-specific functionality (...that's not wrapped up into SDL).
The problem is: std::ifstream::open() doesn't seem to work anymore since I've switched from Dev-C++ to Code::Blocks (I've been using the same MinGW-GCC back-end with both), and from Windows XP to Vista. (It also works perfectly with OS X / xcode (GCC back-end).)
My project links against a static library which #includes <string>, <iostream>, <fstream> and <cassert>, then a call is made to functionality defined in the static library, which in turn calls std::ifstream::open() (this time, directly). Following this, the stream evaluates to false (with both the implicit bool conversion operator and the good() method).
Code:
#include "myStaticLibrary.hpp"
int main(int argc, char **argv)
{
std::string filename("D:/My projects/Test/test.cfg");
std::cout << "opening '" << filename << "'..." << std::endl;
bool success(false);
// call to functionality in the static library
{
std::ifstream infile(filename.c_str());
success = infile.good();
// ...
}
// success == false;
// ...
return 0;
}
stdcout.txt says:
opening 'D:/My projects/Test/test.cfg'...
When I open stdcout.txt, and copy-paste the path with the filename into Start menu / Run, the file is opened as should be (I'm not entirely sure how much of diagnostic value this is though; also, the address is converted to the following format: file:///D:/My%20projects/test/test.cfg).
I've also tried substituting '/'s with the double backslash escape sequence (again, slashes worked fine before), but the result was the same.
It is a debug version, but I'm using the whole, absolute path taken from main()'s argv[0].
Where am I going wrong and what do I need to do to fix it?
Please create a minimal set that recreates the problem. For example, in your code above there's parsing of argv and string concatentation, which do not seem like a necessary part of the question. A minimal set would help you (and us) see exactly what's going wrong, and not be distracted by questions like "what's GetPath()?".
Try to do this instead of assert(infile.good()):
assert(infile);
I have overseen the importance of the fact that the function in question has close()d the stream without checking if it is_open().
The fact that it will set the stream's fail_bit (causing it to evaluate to false) was entirely new to me (it's not that it's an excuse), and I still don't understand why did this code work before.
Anyway, the c++ reference is quite clear on it; the problem is now solved.
The following code:
#include <string>
#include <iostream>
#include <fstream>
#include <assert.h>
using namespace std;;
int main(int argc, char **argv)
{
std::string filename("D:/My projects/Test/test.cfg");
std::cout << "opening '" << filename << "'..." << std::endl;
std::ifstream infile(filename.c_str());
assert(infile.good()); // fails
return 0;
}
works fine on my Windows system using MinGW g++ 4.4.0, if I create the required directory structure. Does the file test.cfg actually exist? If you are opening a stream for input, it wioll fail if the file is not there.
Edit: To remove any DevC++ to CB issues:
build using command line only
make sure you rebuild the static library too