A Simple EHLLAPI Sample Program

The following sample Windows® application will enter the character string "Hello World!" in the first input field of host session 'A'.

  #include <stdlib.h>
  #include <stdio.h>
  #include <windows.h>
  #include "hapi_c.h"
 
  int main(char **argv, int argc) {
    int HFunc, HLen, HRc;
    char HBuff[1];
    struct HLDConnectPS ConnBuff;
    // Send Key string for HOME+string+ENTER:
    char SendString[] = "@0Hello World!@E";
 
    HFunc = HA_RESET_SYSTEM;
    HLen  = 0;
    HRc   = 0;
    hllapi(&HFunc, HBuff, &HLen, &HRc);
    if (HRc != HARC_SUCCESS) {
      printf("Unable to access EHLLAPI.\n");
      return 1;
    }
 
    HFunc = HA_CONNECT_PS;
    HLen  = sizeof(ConnBuff);
    HRc   = 0;
    memset(&ConnBuff, 0x00, sizeof(ConnBuff));
    ConnBuff.stps_shortname = 'A';
    hllapi(&HFunc, (char *)&ConnBuff, &HLen, &HRc);
    switch (HRc) {
      case HARC_SUCCESS:
      case HARC_BUSY:
      case HARC_LOCKED: // All these are OK
        break;
      case HARC_INVALID_PS:
        printf("Host session A does not exist.\n");
        return 1;
      case HARC_UNAVAILABLE:
        printf("Host session A is in use by another EHLLAPI application.\n");
        return 1;
      case HARC_SYSTEM_ERROR:
        printf("System error connecting to session A.\n");
        return 1;
      default:
        printf("Error connecting to session A.\n");
        return 1;
    }
 
    HFunc = HA_SENDKEY;
    HLen  = strlen(SendString);
    HRc   = 0;
    hllapi(&HFunc, SendString, &HLen, &HRc);
    switch (HRc) {
      case HARC_SUCCESS:
        break;
      case HARC_BUSY:
      case HARC_LOCKED:
        printf("Send failed, host session locked or busy.\n");
        break;
      default:
        printf("Send failed.\n");
        break;
    }
 
    HFunc = HA_DISCONNECT_PS;
    HLen  = 0;
    HRc   = 0;
    hllapi(&HFunc, HBuff, &HLen, &HRc);
 
    printf("EHLLAPI program ended.\n");
    return 0;
}

The application could be built with the following command:

  nmake /a all