如何单步执行外部程序

for c++builder,用于vc应该把消息框改一下就可以了

void contour(void){
char ln[100];
  int make;
  char str[100]="";
  char *tip="不能执行：";
sprintf(ln,"%s\%s",getcurrentdir(),"watson.exe");
char path[100];
sprintf(path,"%s",getcurrentdir());
chdir(path);
//showmessage(ln);
  startupinfo startinfo;
  process_information procinfo;
  strcat(str,tip);
  strcat(str, ln);
  getstartupinfo(&startinfo);
  startinfo.dwflags =startf_useshowwindow;
  startinfo.wshowwindow=sw_hide ;
  make=createprocess(null,ln,null,null,false,0,null,null,&startinfo,&procinfo);
  if (!make)
  {
  messagebox(null, str, "提示", mb_ok);
  }
  waitforsingleobject(procinfo.hprocess, infinite);

}