I found this page that describes how to call c functions from D.
I found this page that describes how:
http://arsdnet.net/dtips/#cfunc
on that page he uses gcc, and I use dmc, but I get different results.
This is what I did
// cfile.c file
extern int globalFromD;
void functionFromC(int a) {
globalFromD = a;
}
// end cfile.c
// dfile.d
extern(C) { // this is needed to make it available from C
int globalFromD;
}
extern(C) { // also needed when listing the prototypes for your C functions
void functionFromC(int);
}
import std.stdio; // for writefln
int main() {
globalFromD = 100;
writefln("%d", globalFromD);
functionFromC(500);
writefln("%d", globalFromD);
return 0;
}
// end dfile.d
I compile with:
dmc -c cfile.c
And I get an cfile.obj, which is the object code (.o in gcc).
Then I compile the D code
dmd dfile.d cfile.obj
and I get no errors, so I run it, the result:
// start result
C:\DCode\libtest>dfile.exe
100
100
C:\DCode\libtest>
// end result
Why is it still 100? It should be 500. I don't think functionFromC( int
) is being called, and I can't really find any other sources that
clearly explain how to do this simple stuff, so can anyone explain how
to fix it?
