WebPascal脚本模型教程 - Base64相关

Base64编码，我想大家应该很熟悉了，早期的电子邮件编码，现在的网页图片编码等，都采用了base64编码，来对字符串或者二进制数据流进行转码，以便于传输，在脚本模型中，分别提供了以下几个内置函数，以支持这些操作：

base64('123456',true/false);			|<?base64('123456',true);'|'base64('MTIzNDU2',false);?>
<?
$f:=Base64toFile('iVBORw0KGgoAAAANSUhEUgAAABMAAAARCAYAAAA/mJfHAAACz0lEQVQ4jXVUz2sTQRh9s7M/kiba'
+'1KZSCq0HCQgteLMexINUL6KCIngQpFLBg/+A3kTPIiheFJGi4klPKl6sF7G11Wqp1FKkbWKsSW2y'
+'TTfNZrM74+xOzKatHfKYH+R7+77vfTOkWq1ybBo/F6cwOfoM8zNvYRWyqJSKYDUPED/CDXT3HseZ'
+'SzfR2Z1qxKyWqiCO4zTIOOf4/GEYlrmAzPc3yGemARcBSfO8vs4Rj7RgYOgu9h85F8QWijZU27Yb'
+'7F8/DiOqE2Smn8AuFbDT0AG1TkTrswJEwRGjHibuXwb1XPQdPQ/PZSC5XC5Qll14j4r5DempR3DK'
+'pgzcBopQGKdKsHZFYodvjMCN7JHKGPOw9OMVUJ4FdcuIUk3kjG3hi0wYFIpYcMIx9/g6egYfSLKV'
+'pS9QaxlU1+YRoSIvJtPZAiJBFYKdqgq1vrdn3qG4lIVaqVRQ+j0GpZKDHhQoDArQPIj0ICZS9Ml0'
+'Rf6BR2NIT45IMtfKIOJY4uO0bmsTGlZLcM93UhNkGgxG5LmhYjE9J8k8uwziKfKzPhjCddMZF4gI'
+'NSpT0aoaUF0i0xfOUtsRparV4LEdcKs+mbLROQ8b9sT1U6SiGBQaMUL1jjAx2QlF13VoiT5oXg06'
+'0SWUOshGaAK2Q5EUNQITPcj1YGarZbB9/VC7urrgJk+gmn+KWEtcqqj9p7/qZy2EoiNiyDMmla1F'
+'dyO2txdqKiXvV8EcQlv6hci/LQzeDm5oDlv+BX7hmtiSoHzBaO2/gqKbFPl7MoV/4JuApvVaBWbq'
+'ABIDp0BVJSRTRLPGTz+EWRa9ZllhANuGaLmAwq4eJK7eEs4IhwUZYYwFgv0XI5AtLu7q69vQJ54j'
+'FmsXvdAeumwL1fk8rKIF9+QgEmcvNtpwdCwL8mdFvCd8y5MmrpaJ9fGXILOfQMyiICTg8Q6g9yBi'
+'h45B8x2tD/8tu3NvHH8B9EZlK6ozLtkAAAAASUVORK5CYII=',formatdatetime('yyyyMMddhhmmsszzz".jpg"',now));
if $f<>'' then begin
'文件保存成功，文件名为：'$f;' <img src="'$f'">'
end else begin
'文件保存失败。';
end;
?>

Base64toFile的应用场景，比如手机app端提交一张图片上来，服务端接收并保存成图片，然后返回可访问的路径，比如app中上传自定义人物头像，上传照片等，当然也可以上传其它类型的文件。关于文件上传这块，脚本模型还提供了单独的接口，请参考upfile.html这个演示。