c++ - 如何将二进制字符串转换成base64编码的数据

Question

我正在接收字符串中的二进制数据。我想将其编码为 Base64。是否有任何类可以执行该操作(我想要一个 API)。

Answer 1

CryptBinaryToString...如果您针对 Windows 平台

这是一个小例子:

#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;
}