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The Java Native InterfaceProgrammer’s Guide and Specification phần 5

Thật vậy, lệnh phóng tiêu chuẩn (java) trong JDK hoặc Java 2 SDK phát hành là không có nhiều hơn một chương trình C đơn giản liên kết với máy ảo Java. Phóng các phân tích cú pháp các đối số dòng lệnh, tải máy ảo, và chạy các ứng dụng Java thông qua giao diện gọi. | LEVERAGING EXISTING NATIVE LIBRARIES Shared Stubs 9.2 The CMalloc constructor allocates a memory block of the given size in the C heap. The CMalloc.free method releases the memory block. Equipped with the CFunction and CMalloc classes we can reimplement Win32.CreateFile as follows public class Win32 private static CFunction c_CreateFile new CFunction kernel32.dll native library name CreateFileA native function JNI calling convention public static int CreateFile String fileName int desiredAccess int shareMode int secAttrs int creationDistribution int flagsAndAttributes int templateFile CMalloc cSecAttrs null if secAttrs null file name access read-write mode share mode security attributes how to create file attributes file with attr. to copy cSecAttrs new CMalloc secAttrs.length 4 cSecAttrs.copyIn 0 secAttrs 0 secAttrs.length try return c_CreateFile.callInt new Object fileName new Integer desiredAccess new Integer shareMode cSecAttrs new Integer creationDistribution new Integer flagsAndAttributes new Integer templateFile finally if secAttrs null cSecAttrs.free We cache the CFunction object in a static variable. The Win32 API Create-File is exported from kernel32.dll as CreateFileA. Another exported entry CreateFileW takes a Unicode string as the file name argument. This function fol 115 9.3 One-to-One Mapping versus Shared Stubs LEVERAGING EXISTING NATIVE LIBRARIES lows the JNI calling convention which is the standard Win32 calling convention stdcall . The Win32.CreateFile implementation first allocates a memory block in the C heap that is big enough to hold the security attributes temporarily. It then packages all arguments in an array and invokes the underlying C function Create-FileA through the shared dispatcher. Finally the Win32.CreateFile method frees the C memory block used to hold the security attributes. We call cSecAttrs.free in a finally clause to make sure the temporarily C memory is freed even if the c_CreateFile.callInt call raises an exception. 9.3 .