C++编程 使用openssl加载der证书文件

当需要编程加载der证书的时候 可以这样

        unsigned char buf2[1024]={0};
        FILE* fp = fopen("d:/test.der", "rb");
        int n = fread(buf2, 1, 1024, fp);
        buf2[n] = 0;
        unsigned char* p=buf2;
        X509* m_pX509_1 =d2i_X509(NULL, (const unsigned char  **)&p, n);
        fclose(fp);