为Vala编译gcrypt

Question

我试图用libgcrypt的.vapi在Vala中编译代码。我在系统中安装了库，并在c中运行了一个测试。C中的代码编写没有错误:我输入了以下命令来编译C代码：

gcc -o main main.c -l gcrypt

代码运行得很完美。

但是，下面用Vala编写的代码不使用命令进行编译：

valac --pkg gcrypt --Xcc=-lgcrypt main.vala

main.vala是

using GCrypt;
    public static int main(string[] args)
    {
        Hash h;
        Hash.open(out h, Hash.Algorithm.MD5, Hash.Flag.SECURE);
        return 0;
    }

我不知道我做错了什么。

编辑:很抱歉没有发布错误，但是有：

Loaded package /usr/share/vala-0.30/vapi/glib-2.0.vapi'

Loaded package /usr/share/vala-0.30/vapi/gobject-2.0.vapi'

Loaded package /usr/share/vala-0.30/vapi/gcrypt.vapi'

cc -o '/home/kyul/Documents/Codes/Vala/test_gcrypt/main' '/home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c' -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lgobject-2.0 -lglib-2.0 '-lgcrypt' /home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c: In function ‘_vala_main’:

/home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c:22:38: error: ‘GCRY_MD_FLAGSECURE’ undeclared (first use in this function) gcry_md_open (&_tmp0_, GCRY_MD_MD5, GCRY_MD_FLAGSECURE); ^ /home/kyul/Documents/Codes/Vala/test_gcrypt/main.vala.c:22:38: note: each undeclared identifier is reported only once for each function it appears in error: cc exited with status 256 Compilation failed: 1 error(s), 0 warning(s)

Answer 1

很可能您丢失了.vapi文件。

$ wget https://raw.githubusercontent.com/nemequ/vala-extra-vapis/master/gcrypt.vapi
$ patch < gcrypt.patch
$ valac --vapidir=. --pkg gcrypt --Xcc=-lgcrypt main.vala
$ ./main
$ echo $?
0

我以前从未使用过vala的gcrypt，为了让您的示例工作，我不得不对gcrypt.vapi进行修补，但是修补程序非常简单：

--- gcrypt.vapi
+++ gcrypt.vapi
@@ -619,7 +619,7 @@
            public Error get_oid (uchar[] buffer);
        }

-       [CCode (cname = "enum gcry_md_flags", cprefix = "GCRY_MD_FLAG")]
+       [CCode (cname = "enum gcry_md_flags", cprefix = "GCRY_MD_FLAG_")]
        public enum Flag {
            SECURE,
            HMAC

更新:关于密码错误的，显然Cipher类缺少free_function映射：

--- a/gcrypt.vapi   2016-02-22 21:40:34.458977385 +0200
+++ b/gcrypt.vapi   2016-02-22 21:39:59.662976449 +0200
@@ -560,7 +560,7 @@
            CBC_MAC   /* Enable CBC message auth. code (MAC). */
        }
        [Compact]
-       [CCode (cname = "gcry_cipher_hd_t", lower_case_cprefix = "gcry_cipher_")]
+       [CCode (cname = "struct gcry_cipher_handle", lower_case_cprefix = "gcry_cipher_", free_function = "gcry_cipher_close")]
        public class Cipher {
            public static Error open (out Cipher cipher, Algorithm algo, Mode mode, Flag flags);
            public void close ();