Fix #1449 Windows 上用快捷方式打开时, 可能会无法安装自动更新

app/shared/src/desktopMain/kotlin/tools/update/DesktopUpdateInstaller.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024 OpenAni and contributors.
+ * Copyright (C) 2024-2025 OpenAni and contributors.
  *
  * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
  * Use of this source code is governed by the GNU AGPLv3 license, which can be found at the following link.
@@ -9,6 +9,10 @@
 
 package me.him188.ani.app.tools.update
 
+import com.sun.jna.Native
+import com.sun.jna.platform.win32.Kernel32
+import com.sun.jna.platform.win32.WinDef
+import com.sun.jna.win32.W32APIOptions
 import me.him188.ani.app.platform.ContextMP
 import me.him188.ani.app.platform.FileOpener
 import me.him188.ani.utils.io.SystemPath
@@ -67,7 +71,7 @@ object WindowsUpdateInstaller : DesktopUpdateInstaller {
 
     override fun install(file: SystemPath, context: ContextMP): InstallationResult {
         logger.info { "Installing update for Windows" }
-        val appDir = File(System.getProperty("user.dir") ?: throw IllegalStateException("Cannot get app directory"))
+        val appDir = getExecutableDirectory()
         logger.info { "Current app dir: ${appDir.absolutePath}" }
         if (!appDir.resolve("Ani.exe").exists()) {
             logger.info { "Current app dir does not have 'Ani.exe'. Fallback to manual update" }
@@ -107,6 +111,48 @@ object WindowsUpdateInstaller : DesktopUpdateInstaller {
         }
     }
 
+    @Suppress("FunctionName")
+    interface MyKernel32 : Kernel32 {
+
+        /**
+         * Retrieves the fully qualified path for the file that contains the specified module.
+         * If this parameter is null, GetModuleFileName retrieves the path of the executable file
+         * of the current process.
+         *
+         * @param hModule A handle to the loaded module whose path is being requested. If null,
+         *                this function returns the path of the current process's executable.
+         * @param lpFilename A buffer that receives the fully qualified path of the module.
+         * @param nSize The size of the lpFilename buffer, in characters.
+         * @return The length of the string copied to lpFilename.
+         *
+         * @see <a href="https://learn.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulefilenamew">
+         *      Microsoft Docs: GetModuleFileNameW</a>
+         */
+        fun GetModuleFileNameW(
+            hModule: WinDef.HMODULE?,
+            lpFilename: CharArray,
+            nSize: Int
+        ): Int
+
+        companion object {
+            val INSTANCE: MyKernel32 = Native.load(
+                "kernel32",
+                MyKernel32::class.java,
+                W32APIOptions.DEFAULT_OPTIONS,
+            )
+        }
+    }
+
+    /**
+     * Returns the absolute directory containing the actual .exe on Windows.
+     */
+    fun getExecutableDirectory(): File {
+        val buffer = CharArray(1024)
+        val length = MyKernel32.INSTANCE.GetModuleFileNameW(null, buffer, buffer.size)
+        val fullPath = String(buffer, 0, length)
+        return File(fullPath).parentFile
+    }
+
     @Language("cmd")
     private fun getInstallerScript(
         zipFile: File,