如何向FILE类注入const char* in

如何修改此函数以从字符串而不是文件读取?glfxin显然是一个FILE对象。如果我能以某种方式向FILE类注入一个const char* in，我就会被设置。什么好主意吗?

bool glfxParseEffectFromFile( int effect, const char* file )
{
    bool retVal=true;
    fopen_s(&glfxin, file, "r");
    if(glfxin==NULL) {
        gEffects[effect]->Log()<<"Cannot open file "<<file<<endl;
        gEffects[effect]->Active()=false;
        return false;
    }
    try {
        //glfxdebug=1;
        gEffect=gEffects[effect];
        string fname(file);
        size_t lastSlash=fname.find_last_of('/')+1;
        size_t lastBackSlash=fname.find_last_of('')+1;
        lastSlash=max(lastSlash, lastBackSlash);
        gEffect->Dir()=fname.substr(0, lastSlash);
        glfxrestart(glfxin);
        glfxset_lineno(1);
        glfxparse();
    }
    catch(const char* err) {
        gEffect->Log()<<err<<endl;
        gEffect->Active()=false;
        retVal=false;
    }
    catch(const string& err) {
        gEffect->Log()<<err<<endl;
        gEffect->Active()=false;
        retVal=false;
    }
    catch(...) {
        gEffect->Log()<<"Unknown error occurred during parsing of "<<file<<endl;
        gEffect->Active()=false;
        retVal=false;
    }
    fclose(glfxin);
    return retVal;
}