c调用外部程序

函数名称: spawnl、spawnle、spawnlp、spawnlpe、spawnv、spawnve、spawnvp、spawnvpe
函数原型: int spawnl(int mode, char *path, char *arg 0, … )
  int spawnle(int mode, char *path, char *arg0, … )
  int spawnlp(int mode, char *path, char *arg0, … )
  int spawnlpe(int mode, char *path, char *arg0, … )
  int spawnv(int mode, char *path, char *argv[])
  int spawnve(int mode, char *path, char *argv[], char **env)
  int spawnvp(int mode, char *path, char *argv[])
  int spawnvpe(int mode, char *path, char *argv[], char **env)
函数功能: 在一个程序中调用另外一个程序
函数返回: -1:调用失败，0:调用成功
参数说明: path-被调用程序路径，arg-调用的参数,mode-调用模式，具体如下：
  P_WAIT 0 将父过程挂起，直到子过程执行完毕
  P_NOWAIT 1 父子过程同时执行，Turboc不支持
  P_OVERLAY 2 子过程覆盖父过程
所属文件: <process.h>

C/C++ code

   

    
#include 
    <
    stdio.h
    >
    
#include 
    <
    stdlib.h
    >
    
#include 
    <
    process.h
    >
    
#include 
    <
    errno.h
    >
    
#include 
    <
    string
    .h
    >
    


    int
     main()
{
    
    int
     process_id;

    #if
     defined(__OS2__)||defined(__NT__)
    
    
    int
     status, rc;

    #endif
    

    process_id
    =
    spawnl(P_NOWAIT,
    "
    child.exe
    "
    ,
    "
    child
    "
    ,
    "
    5
    "
    ,NULL);
    
    if
    (process_id
    ==-
    1
    ){
        printf(
    "
    spawn failed-%s/n
    "
    ,strerror(errno));
        exit(EXIT_FAILURE);
    }
    printf(
    "
    Process id=%d/n
    "
    ,process_id);


    #if
     defined(__OS2__)||defined(__NT__)
    
    rc
    =
    cwait(
    &
    status,process_id,WAIT_CHILD);
    
    if
    (rc
    ==-
    1
    ){
        printf(
    "
    wait failed-%s/n
    "
    ,strerror(errno));
    }
    else
    {
        printf(
    "
    wait succeeded-%x/n
    "
    ,status);
        
    switch
    (status
    &
    0xff
    ){
        
    case
     
    0
    :
            printf(
    "
    Normal termination code=%d/n
    "
    ,status
    >>
    8
    );
            
    break
    ;
        
    case
     
    1
    :
            printf(
    "
    Hard-error abort/n
    "
    );
            
    break
    ;
        
    case
     
    2
    :
            printf(
    "
    Trap operation/n
    "
    );
            
    break
    ;
        
    case
     
    3
    :
            printf(
    "
    SIGTERM signal not intercepted/n
    "
    );
            
    break
    ;
        
    default
    :
            printf(
    "
    Bogus return status/n
    "
    );
        }
    }

    #endif
    
    printf(
    "
    spawn completed/n
    "
    );
    
    return
     
    0
    ;
}


    /*
    
[child.c]
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>

int main(int argc,char *argv[])
{
    int delay;
    if(argc<=1)
        exit(EXIT_FAILURE);
    delay=atoi(argv[1]);
    printf("I am a child going to sleep for %d seconds/n",delay);
    sleep(delay);
    printf("I am a child awakening/n");
    exit(123);
    return 0;
}
   
   

    http://www.programfan.com/club/showtxt.asp?id=198953