与客户端通信的CGI程序

/*接收前台传过来的xml数据*/
ULONG  Xml_Get(char **ppChXml)
{
    CHAR *pcEnvVal;
    static CHAR acPostStr[60000];
    ULONG ulPostLen = 0;
    pcEnvVal = getenv("REQUEST_METHOD");/*获取服务器与CGI的传输方式（post/get）*/
    if ( pcEnvVal == NULL )
    {
        ShowInternalError(-1);
        return IPPBX_FAILED;/*找不到环境变量*/
    }
    /* only process "POST" mathed */
    if ( strcmp(pcEnvVal,"POST") ==0 )//post方法
    {
        memset(acPostStr, 0, sizeof(acPostStr));
        if ( IPPBX_OK != process_post(acPostStr, 60000, &ulPostLen) )
        {
            ShowInternalError(-1);
            return IPPBX_FAILED;
        }
    }
    *ppChXml = acPostStr;
    return IPPBX_OK;
}
/*接收处理post方法传来的数据*/
ULONG process_post(char *pcPostStr, ULONG ulMaxLen, ULONG *pulLen)
{
    USHORT usLength;
    int iCL;
    char *pcEnv;

    pcEnv = getenv("CONTENT_LENGTH");/*获得有效信息长度*/
    if ( pcEnv )
    {
        iCL = atoi(pcEnv);
        if ( iCL > (int)ulMaxLen )
        {
            fprintf(stderr," post buffer over flow!");/*stderr为处理错误信息*/
            return IPPBX_FAILED;
        }
    }

    usLength = 0;
    while ( !feof(stdin) )/*stdin为定义的文件流，读取stdin*/
    {
        if ( usLength >= ulMaxLen )
        {
            fprintf(stderr," post buffer too small!");
            return IPPBX_FAILED;
        }

        pcPostStr[usLength++] = (char)fgetc(stdin);//标准输入读取一定数据
    }

    /*The last char is illegal*/
    usLength--;
    pcPostStr[usLength] = 0;
    *pulLen = usLength;

    return IPPBX_OK;
}