Importing Variables From Outside File

[TommyFeticini]

I'm looking to be able to import variables from an outside source. If i were to create a file that said:
var1 = 15
var2=C:/Files/run.exe
How would i accomplish this? What would be the best alternative if this is not possible.

[BobS0327]

One option would be to write and read a structure containing all the required info to/from a ASCII text file.

#include <stdio.h>
#include <string.h>

struct rec
{
    int  var1;
    char var2[256];
};

int main(void)
{
    FILE *f;
    struct rec r, t;
    f=fopen("myFile.txt","w");
    if (!f)
        return 1;
    r.var1 = 15;
    strcpy(r.var2, "C:/Files/run.exe" );
    fwrite(&r,sizeof(struct rec),1,f);
    fclose(f);

    f=fopen("myFile.txt","r");
    if (!f)
        return 1;
    fread(&t,sizeof(struct rec),1,f);
    printf("var1 = %d\nvar2 = %s\n",r.var1,r.var2);
    fclose(f);
    return 0;
}

[Amleto]

urgh. why use out-dated headers when there are perfectly good c++ standard equivalents??

please see <fstream>, <string> and <iostream>

[BobS0327]

urgh. why use out-dated headers when there are perfectly good c++ standard equivalents??

please see <fstream>, <string> and <iostream>

Hmmm... Maybe somebody should notify the International Organization of Standards that their C99 C standard is out-dated.

[Speedo]

I'm looking to be able to import variables from an outside source. If i were to create a file that said:
var1 = 15
var2=C:/Files/run.exe
How would i accomplish this? What would be the best alternative if this is not possible.

1. Open the file in question.
2. Read a line from the file as a string
3. Parse that string into an identifier ("var1") and a value ("15")
4. Store the identifier and value using some method (std::map will do nicely)
5. If you're not at the end of the file, go to 2
6. Do something useful with the information you read
7. ...
8. Profit!

Maybe somebody should notify the International Organization of Standards that their C99 C standard is out-dated.

If you're using C++ they're out of date unless you have a specific need for them (usually to support other legacy code).