将包含 XML 文本的 base64 解码为 String 变量

Question

我无法解码以 base64 格式提供的 XML，字符串变量 (lv_string) 显示一些不可读的内容。

示例：

Ü-ÅïÎ#è-´ï®¹ïn÷ëÞ#èMÃÛmõØMôÛm´ë##ë~#ë#½èN»Ü=¶ãÞwà]#ßÍüß#ýØ=õÛm´ï~øë^#ë#µè.#èN¹Ü=¶ïÞ¹ï

代码如下：

Data: lt_content    Type standard table of x255,
      lv_xstring    Type xstring,
      lv_string     Type string,
      encod         Type Abap_encoding Value 4110.

Select Single xml_dte into @Data(xml_b64)
 From zmmvf_edocdet 
  Where numinterno = '0000000012'.

  IF Sy-subrc Eq 0.

    Call function 'SCMS_BASE64_DECODE_STR'
     Exporting
      Input         = xml_b64
     Importing
      Output        = lv_xstring
     Exceptions
      Failed        = 1
      Others        = 2.

    If Sy-subrc Eq 0.

      Data(lv_len) = xstrlen( lv_xstring ).
      Call function 'SCMS_XSTRING_TO_BINARY'
       Exporting
        buffer        = lv_xstring
       Importing
        output_length = lv_len
       Tables
        binary_tab    = lt_content[].

      Call function 'SCMS_BINARY_TO_STRING'
       Exporting
        input_length = lv_len
*        encoding     = encod
       Importing
        text_buffer  = lv_string
       Tables
        binary_tab   = lt_content[]
       Exceptions
        failed       = 1
        Others       = 2.
    ENDIF.
  ENDIF.

Answer 1

我以前也遇到过这个问题。您可以使用以下

data:
  lv_base64 type string,
  lv_xstring type xstring,
  lv_output type string.

* example base64 string
lv_base64 = 'PGh0bWw+PGhlYWQ+PHRpdGxlPlRpdGxlPC90aXRsZT48L2hlYWQ+PGJvZHk+PHA+SGVsbG8gV29ybGQ8L3A+PC9ib2R5PjwvaHRtbD4='.

* convert base64 to binary (xstring)
call function 'SCMS_BASE64_DECODE_STR'
    exporting
      input  = lv_base64
    importing
      output = lv_xstring
    exceptions
      failed = 1
      others = 2.

* use codepage conversion to convert xstring to string (UTF-8)
* catch possible conversion errors
  try.

      lv_output = cl_abap_codepage=>convert_from( source = lv_xstring ).

    catch cx_parameter_invalid_range .
    catch cx_sy_codepage_converter_init .
    catch cx_sy_conversion_codepage .
    catch cx_parameter_invalid_type .
  endtry.

  write lv_output.

结果如下输出

<html><head><title>Title</title></head><body><p>Hello World</p></body></html>

您可以使用附加参数控制转换，例如：

如果您希望使用不同的代码页

如果您想用特殊字符替换不可见字符

如果您想忽略转换错误

lv_output = cl_abap_codepage=>convert_from(
    source      = lv_xstring
    codepage    = <your favourite codepage here>
    replacement = <conversion char for not convertible chars>
    ignore_cerr = <pass 'X' to ignore conversion errors>
).

Answer 2

一个简短的解决方案，如果我们假设base64字符串包含UTF-8编码中的XML，就是使用class DECODE_BASE64的方法CL_HTTP_UTILITY:

lv_string = cl_http_utility=>if_http_utility~decode_base64( xml_b64 ).

最小、完整且可验证的示例：

（请允许我重用@manuel_b的好例子）

DATA(xml_b64) = `PGh0bWw+PGhlYWQ+PHRpdGxlPlRpdGxlPC90aXRsZT48L2hlYWQ+`
             && `PGJvZHk+PHA+SGVsbG8gV29ybGQ8L3A+PC9ib2R5PjwvaHRtbD4=`.

DATA(lv_string) = cl_http_utility=>if_http_utility~decode_base64( xml_b64 ).

ASSERT lv_string = `<html><head><title>Title</title></head><body><p>Hello World</p></body></html>`.

将包含 XML 文本的 base64 解码为 String 变量

Decode base64 containing XML text into String variable

xml

binary

base64

abap