问题
I'm using the following bootstrapping code to load my native activity (jngl-test):
#include <android/native_activity.h>
#include <android/log.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdexcept>
const std::string LIB_PATH = "/data/data/com.bixense.jngl_test/lib/";
void* load_lib(const std::string& l) {
void* handle = dlopen(l.c_str(), RTLD_NOW | RTLD_GLOBAL);
if (!handle) {
throw std::runtime_error(std::string("dlopen(") + l + "): " + strerror(errno));
}
return handle;
}
void ANativeActivity_onCreate(ANativeActivity* app, void* ud, size_t udsize) {
try {
load_lib(LIB_PATH + "libogg.so");
load_lib(LIB_PATH + "libvorbis.so");
auto main = reinterpret_cast<void (*)(ANativeActivity*, void*, size_t)>(
dlsym(load_lib(LIB_PATH + "libjngl-test.so"), "ANativeActivity_onCreate")
);
if (!main) {
throw std::runtime_error("undefined symbol ANativeActivity_onCreate");
}
main(app, ud, udsize);
} catch(std::exception& e) {
__android_log_print(ANDROID_LOG_ERROR, "bootstrap", e.what());
ANativeActivity_finish(app);
}
}
I get the following error message:
dlopen(/data/data/com.bixense.jngl_test/lib/libjngl-test.so): Invalid argument
This doesn't tell me at all whats going wrong. Is there a way to get more debug output? What could "Invalid argument" mean?
回答1:
I fixed it:
dlerror()
gives a far better error message.
Here's the bootstrap code if someone is interested:
#include <android/native_activity.h>
#include <android/log.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdexcept>
void* load_lib(const std::string& l) {
auto handle = dlopen(std::string("/data/data/com.bixense.jngl_test/lib/" + l).c_str(),
RTLD_NOW | RTLD_GLOBAL);
if (!handle) {
throw std::runtime_error(std::string("dlopen(") + l + "): " + dlerror());
}
return handle;
}
void ANativeActivity_onCreate(ANativeActivity* app, void* ud, size_t udsize) {
try {
load_lib("libogg.so");
load_lib("libvorbis.so");
auto main = reinterpret_cast<void (*)(ANativeActivity*, void*, size_t)>(
dlsym(load_lib("libjngl-test.so"), "ANativeActivity_onCreate")
);
if (!main) {
throw std::runtime_error("undefined symbol ANativeActivity_onCreate");
}
main(app, ud, udsize);
} catch(std::exception& e) {
__android_log_print(ANDROID_LOG_ERROR, "bootstrap", e.what());
ANativeActivity_finish(app);
}
}
回答2:
You could do this..
put that lib in raw directory and load it
For raw files, you should consider creating a raw folder inside res directory and then call
getResources().openRawResource(resourceName)
from your activity.
then you can use it the way you like.
来源:https://stackoverflow.com/questions/16961705/dlopen-invalid-argument-when-loading-native-activity