Question

我的主计算机上运行的JNI应用程序是Windows 7 64位，但它无法在我的笔记本电脑上运行，这是Windows XP 32位。在笔记本电脑上，32位版本的本机DLL加载时没有UnsatisfiedLinkError，但是在调用实际的本机方法时出现错误。以下是我使用MinGW编译DLL的方法：

cd bin
javah MyClass
move /Y MyClass.h ../
"%mingw64%\bin\g++" -shared -I"C:\Program Files\Java\jdk1.8.0_05\include" -I"C:\Program Files\Java\jdk1.8.0_05\include\win32" -o src/lib/MyLibrary.dll MyClass.cpp
@echo "Making the 32-bit library..."
g++ -shared -I"C:\Program Files\Java\jdk1.8.0_05\include" -I"C:\Program Files\Java\jdk1.8.0_05\include\win32" -o src/lib/MyLibrary_32.dll MyClass.cpp

这是我用来加载库的代码，技术上适用于两个处理器。

    String processor = System.getProperty("sun.arch.data.model").equals("32") ? new String("_32") : new String("");
    try { System.load(System.getProperty("user.dir") + "\\MyLibrary" + processor + ".dll"); }
    catch(UnsatisfiedLinkError e) {
        //If the dll was not found, extract the one packaged as a resource in the .jar
        InputStream in = ML_Overworld.class.getClassLoader().getResourceAsStream("lib/MyLibrary" + processor + ".dll");
        if(in == null) {
            printError(String.format("MyLibrary%s.dll was not contained in the jar.", processor));
            return;
        }
        File outPath = new File(System.getProperty("user.dir") + "\\MyLibrary" + processor + ".dll");
        try {
            DataOutputStream out = new DataOutputStream(new FileOutputStream(outPath));
            try {
                int input;
                while((input = in.read()) != -1)
                    out.write(input);
                out.close();
                in.close();
            }
            catch(IOException e2) {
                printError(String.format("MyLibrary%s.dll failed to extract: ", processor) + e2.getMessage() + ".");
                return;
            }
        }
        catch(FileNotFoundException e3) {
            printError(String.format("MyLibrary%s.dll failed to extract: ", processor) + e3.getMessage() + ".");
            return;
        }
        try { System.load(System.getProperty("user.dir") + "\\MyLibrary" + processor + ".dll"); }
        catch(UnsatisfiedLinkError e4) {
            printError(String.format("MyLibrary%s.dll failed to load: ", processor) + e4.getMessage() + ".");
            return;
        }
    }

作为参考，这是在32位笔记本电脑上抛出Unsatisfied Link Error的本机方法： public static native void readMap(String path, cMap m);

[solution]：在编译32位DLL时将--kill-at添加到g ++参数中。

Java JNI本机库在64位和32位上加载，但不能在32位上运行

0 个答案: