问题描述
我正在尝试将K / N与libsecret结合使用。 它包含以下结构:
typedef struct {
const gchar *name;
SecretSchemaFlags flags;
SecretSchemaAttribute attributes[32];
} SecretSchema;
(从这里开始:https://developer.gnome.org/libsecret/0.18/libsecret-SecretSchema.html#SecretSchema)
cinterop生成以下类:
@kotlinx.cinterop.internal.CStruct public final class SecretSchema public constructor(rawPtr: kotlinx.cinterop.NativePtr /* = kotlin.native.internal.NativePtr */) : kotlinx.cinterop.CStructvar {
@kotlinx.cinterop.internal.CStruct.VarType public companion object : kotlinx.cinterop.CStructvar.Type {
}
public final val attributes: kotlinx.cinterop.CArrayPointer<org.libsecret.SecretSchemaAttribute> /* = kotlinx.cinterop.CPointer<org.libsecret.SecretSchemaAttribute> */ /* compiled code */
public final var flags: org.libsecret.SecretSchemaFlags /* = kotlin.UInt */ /* compiled code */
public final var name: kotlinx.cinterop.CPointer<org.libsecret.gcharVar /* = kotlinx.cinterop.ByteVarOf<kotlin.Byte> */>? /* compiled code */
public final var reserved: org.libsecret.gint /* = kotlin.Int */ /* compiled code */
public final var reserved1: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
public final var reserved2: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
public final var reserved3: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
public final var reserved4: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
public final var reserved5: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
public final var reserved6: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
public final var reserved7: org.libsecret.gpointer? /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed>? */ /* compiled code */
}
我正在尝试像这样定义它:
alloc<SecretSchema> {
name = "com.charlag.tuta-bridge".cstr.ptr
flags = SECRET_SCHEMA_NONE
}
但是,我看不到修改attributes
的方法,因为CArrayPointer
(CPointer
)没有公开修改方法。
我还注意到了一些reserved
字段。我应该改用它们吗?
这是在C语言中如何使用的示例: https://developer.gnome.org/libsecret/0.18/c-examples.html#c-schema-example
解决方法
似乎默认情况下是没有办法的,我最终这样做:
/**
* This is a version of the function which is missing in standard library. It initializes members
* of the array.
* If possible,allocate array of correct elements instead. It might not be possible with C
* structures.
*/
inline fun <reified T : CVariable> CArrayPointer<T>.setAt(index: Int,value: CValue<T>) {
value.write(this.rawValue + index * sizeOf<T>())
}
它对我有用,并且使用与访问相同的指针位置计算
,据我所知,这里最直接的选择是使用[]
运算符,并将分配的SecretSchemaAttribute
分配给这些地址。要了解有关指针类型交互的更多信息,请选中此documentation page。可能有些过时了,但您可以在此处或在kotlinlang Slack处提出进一步的问题。