所有
在这里,我想通过运行在Android的NDK系统调用sh文件。
Here i want to run .sh file via system call in android NDK.
我能跑 CP,RM
通过系统调用命令。但sh命令不是通过系统调用的工作。
I able to run cp,rm
command via system call. but sh command is not working via system call.
我也装忙盒是用低于codeI组对 test.sh
所有权限。
I also installed busy-box on android.I am using below code.I set all permission on test.sh
.
code:
#include <stdlib.h>
#include <stdio.h>
#include <android/log.h>
#include <jni.h>
#define LOG_TAG "Demo"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
void Java_com_ndkdemo_NDKdemoActivity_systemcall(JNIEnv * env, jobject obj) {
int result;
result = system("cp /mnt/sdcard/test /Download");
LOGD("result is cp %d", result);
result = system("sh ./test.sh");
LOGD("result of test.sh is %d", result);
}
输出:
result is cp 0.
result of test.sh is 0.
在这里我得到0 系统(SH ./test.sh);
,但没有启动 test.sh
脚本。
Here i am getting 0 in system("sh ./test.sh");
but not started the test.sh
script.
不能得到输出嗨
在控制台上。
cant get output "Hi"
on console.
test.sh包含
#!/system/bin/
echo "Hi"
如果我在提示符下执行命令,直接比它做工精细和给定输出嗨
在控制台上。
If i am executing direct command on prompt than its working fine and its given output "Hi"
on console.
请帮我找出这个问题。
感谢
你是哪里期待看到的回声?默认情况下,Android的标准输出发送到/ dev / null的。
Where are you expecting to see the "echo"? By default, android sends stdout to /dev/null.
按照文档可以重定向输出和错误到日志(所以它会显示在logcat中)使用以下命令:
According to the documentation you can redirect stdout and stderr to the log (so it will show up in logcat) using the following commands:
$ adb shell stop
$ adb shell setprop log.redirect-stdio true
$ adb shell start
现在,你可能会看到你的回声亚行logcat
。
Now you may see your echo in adb logcat
.