How to initialize LPBOOL? Win32 Api in Kotlin Native

Question

How do I call this in Kotlin Native

    val result = CopyFileExA(
                          oldFile,
                          newFile,
                          null,
                          null,
                          false,
                          COPY_FILE_FAIL_IF_EXISTS
                         )

while false is not accepted as LPBOOL? How do I initialize LPBOOL to be used in Kotlin native interface?

I am getting the following error :

the boolean literal does not conform to the expected type

LPBOOL? /* = CPointer */>? */ false,

Answer 1

Answering the question that is already in github from @olonho

You need to alloc a variable using the especial platform types NativePlacement

import kotlinx.cinterop.*
import platform.windows.*

val buffer = nativeHeap.allocArray<ByteVar>(size)
<use buffer>
nativeHeap.free(buffer)

but for avoid the free call or unallocated memory you can use the memScoped

val fileSize = memScoped {
  val statBuf = alloc<statStruct>()
  val error = stat("/", statBuf.ptr)
  statBuf.st_size
}

important, the pointer binding will be with statBuf.ptr, then your code will be:

    memScoped {
      val oldFile = "README.md"
      val newFile = "${oldFile}.cp"
      val bool = alloc<BOOLVar>()
      bool.value = FALSE

      val result = CopyFileExA(
              oldFile,
              newFile,
              null,
              null,
              bool.ptr,
              COPY_FILE_FAIL_IF_EXISTS
      )
    }

This have to be similar if you need to binding with a objective-c library.