【Android】 C/C++ 标准输入输出打印至Android日志控制台
C++
#if defined(__ANDROID__)
start_logger("yeasound_sdk-native");
#endif
#if defined(__ANDROID__)
#include <stdio.h>
#include <unistd.h>
#include <android/log.h>
#include <android/native_activity.h>
#include <android/asset_manager_jni.h>
#include <android/asset_manager.h>
#endif
#if defined(__ANDROID__)
extern "C" {
static int pfd[2];
static pthread_t thr;
static const char *tag = "myapp";
static void *thread_func(void *)
{
ssize_t rdsz;
char buf[128];
while ((rdsz = read(pfd[0], buf, sizeof buf - 1)) > 0) {
if (buf[rdsz - 1] == '\n') --rdsz;
buf[rdsz] = 0; /* add null-terminator */
__android_log_write(ANDROID_LOG_DEBUG, tag, buf);
}
return 0;
}
int start_logger(const char *app_name)
{
tag = app_name;
/* make stdout line-buffered and stderr unbuffered */
setvbuf(stdout, 0, _IOLBF, 0);
setvbuf(stderr, 0, _IONBF, 0);
/* create the pipe and redirect stdout and stderr */
pipe(pfd);
dup2(pfd[1], 1);
dup2(pfd[1], 2);
/* spawn the logging thread */
if (pthread_create(&thr, 0, thread_func, 0) == -1)
return -1;
pthread_detach(thr);
return 0;
}
}
#endif
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
{
JNIEnv *env;
if (vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6) != JNI_OK) {
return JNI_ERR;
}
#if defined(__ANDROID__)
start_logger("yeasound_sdk-native");
#endif
/* --javaVM是虚拟机在JNI中的表示 --*/
env->GetJavaVM(&g_jni_vm);
if (g_jni_vm == nullptr) {
return JNI_ERR;
}
jni_utils_set_global_vm(g_jni_vm);
if(jni_cache_init() != YeasoundLib::YS_STATUS_SUCCESS){
return JNI_ERR;
}
return JNI_VERSION_1_6;
}