Question

static jboolean libinit(JNIEnv *env, jobject obj, jint sdk) {
/*
#include <sys/system_properties.h>
   int sdk;
   char c[PROP_VALUE_MAX];
if(__system_property_get("ro.build.version.sdk",c) > 0) sscanf(c,"%d",&sdk);
else sdk = 8;
*/
     __android_log_print(ANDROID_LOG_INFO,"liblossless","libinit: sdk=%d",sdk);
    if(!libhandle) {
        if(sdk < 8) libhandle = dlopen("/data/data/net.avs234/lib/libatrack8.so",     RTLD_NOW);
        else libhandle = dlopen("/data/data/net.avs234/lib/libatrack9.so", RTLD_NOW);
    if(libhandle) {
        libmedia_pause = (typeof(libmedia_pause))     dlsym(libhandle,"libmedia_pause");
    libmedia_resume = (typeof(libmedia_resume)) dlsym(libhandle,"libmedia_resume");
    libmedia_start = (typeof(libmedia_start)) dlsym(libhandle,"libmedia_start");
    libmedia_stop = (typeof(libmedia_stop)) dlsym(libhandle,"libmedia_stop");
    libmedia_write = (typeof(libmedia_write)) dlsym(libhandle,"libmedia_write");
    libmediacb_start = (typeof(libmediacb_start)) dlsym(libhandle,"libmediacb_start");
    libmediacb_stop = (typeof(libmediacb_stop)) dlsym(libhandle,"libmediacb_stop");
        libmediacb_write = (typeof(libmediacb_write)) dlsym(libhandle,"libmediacb_write");
                libmediacb_wait_done = (typeof(libmediacb_wait_done))         dlsym(libhandle,"libmediacb_wait_done");
        }
    }
    __android_log_print(ANDROID_LOG_INFO,"liblossless","libinit: handle=%p",libhandle);
    return libhandle != 0;
}

static jboolean libexit(JNIEnv *env, jobject obj) {
   int ret = 0;
     __android_log_print(ANDROID_LOG_INFO,"liblossless","libexit");
    if(libhandle) {
        ret = dlclose(libhandle) ? 0 : 1;
        libhandle = 0;
    }
    return ret;
}

用cygwin编译给我一个错误：

    /cygdrive/C/androidndk4/apps/lossless/project/bin/ndk/local/armeabi/objs/lossles

s / main.o：在函数libexit': /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:247: undefined referenc e to dlclose'中 / cygdrive / C / androidndk4 /应用/无损/项目/斌/ NDK /本地/ armeabi / OBJ文件/ lossles s / main.o：在函数libinit': /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:226: undefined referenc e to dlopen'中 /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:228：undefined referenc e到dlsym' /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:229: undefined referenc e to dlsym' /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:230：undefined referenc e到dlsym' /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:231: undefined referenc e to dlsym' /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:232：undefined referenc e到dlsym' /cygdrive/C/androidndk4/apps/lossless/project/bin/ndk/local/armeabi/objs/lossles s/main.o:/cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:233: more unde fined references to dlsym'跟随 / cygdrive / C / androidndk4 /应用/无损/项目/斌/ NDK /本地/ armeabi / OBJ文件/ lossles s / main.o：在函数libinit': /cygdrive/C/androidndk4/apps/lossless/project/jni/main.c:225: undefined referenc e to dlopen'中 collect2：ld返回1退出状态 make： * [/ cygdrive / C / androidndk4 / apps / lossless / project / bin / ndk / local / armeabi / l iblossless.so]错误1

Answer 1

您的错误提到'未定义的引用'。这意味着您正在使用的函数（dlopen，dlclose，dlsym等）未定义。检查您是否包含正确的头文件，并检查您是否正确链接所需的库（如果这些函数来自共享库）。

为什么我收到cygwin的错误？

1 个答案: