做个速记，以百度搜索为例。

void EncodePlainToURL(char *original, const char * output_param_name)
{
    //将字符串编码转为UTF-8
    lr_convert_string_encoding(original, LR_ENC_SYSTEM_LOCALE, LR_ENC_UTF8, "strUTF8");
    //去掉C数组后面的null终止符
    lr_save_string(lr_eval_string("{strUTF8}"), output_param_name);
    //将UTF-8字符串URL encode
    web_convert_param(output_param_name, "SourceEncoding=PLAIN", "TargetEncoding=URL", LAST);
}
Action()
{
    lr_output_message("******keyword: %s", lr_eval_string("{keyword}"));
    EncodePlainToURL(lr_eval_string("{keyword}"), "newKeyWord");
    lr_output_message("***newKeyWord: %s", lr_eval_string("{newKeyWord}"));
    web_url("s",
        "URL=http://www.baidu.com/s?wd={newKeyWord}&rsv_bp=0&rsv_spt=3&ie=utf-8&rsv_sug3=4&inputT=826",
        "Resource=0",
        "RecContentType=text/html",
        "Referer=http://www.baidu.com/",
        "Snapshot=t2.inf",
        "Mode=HTML",
        EXTRARES,
        LAST);
    return 0;
}

*** walker ***