如何通过gdbus发送二维数组？

问题描述：

我试图通过dbus发送两个字符串数组（我正在使用gdbus API，使用gdbus-codegen）。
我已经定义了dbus接口，如下所示。如何通过gdbus发送二维数组？

<method name="foo"> 
      <arg name="count" direction="out" type="i" /> 
      <arg name="array" direction="out" type="a(ia(s))" /> 
</method>

我想通过以下方式来创建GVariant：

GVariantBuilder *builder; 
GVariant *variant; 
builder = g_variant_builder_new(G_VARIANT_TYPE("a(ia(s))")); 
for (int i = 0; i < count; i++) 
{ 
    g_variant_builder_add(builder, "(ia(s))", 
          options[i].num_supported, 
          pack_string_array(options[i].num_supported, options[i].supported_values)); 
} 

variant = g_variant_new("a(a(s))", builder); 
my_interface_complete_foo(interface, invocation, count, variant);

其中pack_string_array组C风格的字符串数组到gvariant。

GVariant* pack_string_array(int num_val, char **val) 
{ 
    GVariantBuilder *builder; 
    GVariant *values; 
    builder = g_variant_builder_new(G_VARIANT_TYPE("a(s)")); 
    for (int i = 0; i < num_val; i++) 
    { 
     g_message("%s", val[i]); 
     g_variant_builder_add(builder, "(s)", val[i]); 
    } 

    if (num_val == 0) 
     g_variant_builder_add(builder, "(s)", "NA"); 

    values = g_variant_new("a(s)", builder); 
    return values; 
}

然而，当我测试了一下，程序崩溃与以下错误：

GLib-CRITICAL **: g_variant_builder_end: assertion 'ensure_valid_builder (builder)' failed 
g_variant_get_type: assertion 'value != NULL' failed

我怎么能发送字符串数组的数组在DBUS？

答

用于建设者和变异的签名不匹配：

builder = g_variant_builder_new(G_VARIANT_TYPE("a(ia(s))")); 
... 
variant = g_variant_new("a(a(s))", builder);

答

GVariantBuilder* builder = g_variant_builder_new(G_VARIANT_TYPE("a(ia(s))")); 

for (int i = 0; i < count; i++) { 

    GVariantBuilder* builderStr = g_variant_builder_new(G_VARIANT_TYPE("a(s)")); 
    for (int j = 0; j < nr_of_string; j++) { 
     g_variant_builder_add(builderStr, "(s)", "Test"); 
    } 
    g_variant_builder_add(builder, "(ia(s))", 32, **builderStr**); 
} 

GVariant* retVariant = g_variant_builder_end(builder);

如何通过gdbus发送二维数组？

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