如何将二进制字符串转换为base64编码数据

Question

我正在接收字符串中的二进制数据。我想将它编码到Base64中。有没有任何类可以做这个操作（我想要一个API）。

Answer 1

快速谷歌搜索c++ base64为您提供这些链接：
1
2
3

Answer 2

CryptBinaryToString ...如果你的目标到Windows平台

这里是一个小例子：

#include <Windows.h> 

#pragma comment(lib, "crypt32.lib") 

int main() 
{ 
    LPCSTR pszSource = "Man is distinguished, not only by his reason, but ..."; 
    DWORD nDestinationSize; 
    if (CryptBinaryToString(reinterpret_cast<const BYTE*> (pszSource), strlen(pszSource), CRYPT_STRING_BASE64, nullptr, &nDestinationSize)) 
    { 
     LPTSTR pszDestination = static_cast<LPTSTR> (HeapAlloc(GetProcessHeap(), HEAP_NO_SERIALIZE, nDestinationSize * sizeof(TCHAR))); 
     if (pszDestination) 
     { 
      if (CryptBinaryToString(reinterpret_cast<const BYTE*> (pszSource), strlen(pszSource), CRYPT_STRING_BASE64, pszDestination, &nDestinationSize)) 
      { 
       // Succeeded: 'pszDestination' is 'pszSource' encoded to base64. 
      } 
      HeapFree(GetProcessHeap(), HEAP_NO_SERIALIZE, pszDestination); 
     } 
    } 
    return 0; 
}