Kotlin/Native尝试

Kotlin/Native尝试在官网看到Kotlin/Native已经达到1.0 Beta版于是就去尝试了一下，结果发现坑还是挺多的。首先Kotlin/JVM很多库是用不了的，这个已经猜到了。官网说已经预先导入了 POSIX、 gzip、 OpenGL、 Metal、 Foundation 等很多其他的库，然后我就尝试了下基本的文件读写。和C还是有一点的差别的。如下：fun hello(): String = “Hello, Kotlin/Native!“fun letter() = “abcdefghigklmnopqrstuvwxyz"fun main(args: Array<String>) { val file = fopen(“data.txt”, “w”) fprintf(file, “%s”, hello()) fprintf(file, “%s”, “\n”) fprintf(file, “%s”, letter()) fclose(file) println(“write finished”) val filer = fopen(“data.txt”, “r”) val buf = ByteArray(255)// fscanf(filer, “%s”, buf.pin().addressOf(0)) fgets(buf.pin().addressOf(0), 255, filer) fclose(filer) print(buf.stringFromUtf8()) buf.pin().unpin() println(“read finished”) system(“pause”)}运行结果如下> Task :runProgramwrite finishedHello, Kotlin/Native!read finishedPress any key to continue . . . C:\BuildAgent\work\4d622a065c544371\runtime\src\main\cpp\Memory.cpp:1150: runtime assert: Memory leaks found> Task :runProgram FAILED令人郁闷的是提示C:\BuildAgent\work\4d622a065c544371\runtime\src\main\cpp\Memory.cpp:1150: runtime assert: Memory leaks found，虽然调用了buf.pin().unpin()，但依旧提示内存泄漏，也没有异常退出啊。如果是改成如下方式就不会提示错误了：fun hello(): String = “Hello, Kotlin/Native!“fun letter() = “abcdefghigklmnopqrstuvwxyz"fun main(args: Array<String>) { val file = fopen(“data.txt”, “w”) fprintf(file, “%s”, hello()) fprintf(file, “%s”, “\n”) fprintf(file, “%s”, letter()) fclose(file) println(“write finished”) val filer = fopen(“data.txt”, “r”) val buf = ByteArray(255)// fscanf(filer, “%s”, buf.pin().addressOf(0))// fgets(buf.pin().addressOf(0), 255, filer)// fclose(filer)// print(buf.stringFromUtf8())// buf.pin().unpin() buf.usePinned { fgets(it.addressOf(0), 255, filer) fclose(filer) print(buf.stringFromUtf8()) } println(“read finished”) system(“pause”)}结果如下：> Task :runProgramwrite finishedHello, Kotlin/Native!read finishedPress any key to continue . . . BUILD SUCCESSFUL in 9s另外吐槽下，这么几行代码就要9s，是不是太慢了。随后又试了下开启pthread线程，但是pthread_create函数的第一个参数th: kotlinx.cinterop.CValuesRef<platform.posix.pthread_tVar>，CValuesRef类型的变量怎么获得一直无解，难道只能通过继承获得？然后我在写文章的时候又发现只要这样写就可以了？？？fun main(args: Array<String>) { pthread_create(null, null, test(), null)}typealias func = kotlinx.cinterop.CPointer<kotlinx.cinterop.CFunction<(kotlinx.cinterop.COpaquePointer?) -> kotlinx.cinterop.COpaquePointer?>>?fun test(): func { return staticCFunction<kotlinx.cinterop.COpaquePointer?, kotlinx.cinterop.COpaquePointer?> { println(“run test”) it }}结果如下：> Task :runProgramrun testBUILD SUCCESSFUL in 8s> Task :runProgramwrite finishedHello, Kotlin/Native!read finishedPress any key to continue . . . C:\BuildAgent\work\4d622a065c544371\runtime\src\main\cpp\Memory.cpp:1150: runtime assert: Memory leaks found