Tcl C API: redirect stdout of embedded Tcl interp to a file without affecting the whole program

Question

#include 
int main(int argc, char** argv)
{
    Tcl_Interp *interp = Tcl_CreateInterp();

    Tcl_Channel stdoutChannel = Tcl_GetChannel(interp, \"stdout\",         


        

Answer 1

Try this:

FILE *myfile = fopen("myfile", "W+");
Tcl_Interp *interp = Tcl_CreateInterp(); 
Tcl_Channel myChannel = Tcl_MakeFileChannel(myfile, TCL_WRITABLE);
Tcl_RegisterChannel(myChannel);
Tcl_SetStdChannel(myChannel, TCL_STDOUT);

You need to register the channel with the interpreter before you can reset the std channel to use it.