module->methods->open
时间: 2023-12-23 18:06:17 浏览: 20
module->methods->open是指在一个相机模块中,通过调用该函数来打开相机设备。具体的调用流程如下:
首先,在相机模块的结构体中,定义了一个名为camera_module_methods的静态变量,它是一个hw_module_methods_t类型的结构体变量,并包含了一些相机模块的方法。
接下来,在CameraModule类中,通过访问mModule->common.methods->open来调用相机模块中的open方法。具体代码如下:mModule->common.methods->open(&mModule->common, id, device)
在CameraModule类中的open方法中,会调用filterOpenErrorCode和mModule->common.methods->open函数。具体代码如下:res = filterOpenErrorCode(mModule->common.methods->open(&mModule->common, id, device));
最后,在底层的实现中,通过module->methods->open来调用具体的相机设备的初始化工作。这样就完成了app到底层的初始化工作。<span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>
相关问题
基于Android framework,帮我写一个native层获取GPS信息的功能
好的,以下是基于Android framework的native层获取GPS信息的功能实现:
1. 首先,需要在Android.mk文件中添加如下代码:
```
LOCAL_LDLIBS += -llog -lm -lhardware
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_SRC_FILES := gps.c
```
2. 在include文件夹下创建gps.h头文件,并添加如下代码:
```
#ifndef GPS_H
#define GPS_H
#include <jni.h>
#ifdef __cplusplus
extern "C" {
#endif
JNIEXPORT void JNICALL Java_com_example_gps_GPSManager_start(JNIEnv *env, jobject instance);
JNIEXPORT void JNICALL Java_com_example_gps_GPSManager_stop(JNIEnv *env, jobject instance);
JNIEXPORT jdouble JNICALL Java_com_example_gps_GPSManager_getLatitude(JNIEnv *env, jobject instance);
JNIEXPORT jdouble JNICALL Java_com_example_gps_GPSManager_getLongitude(JNIEnv *env, jobject instance);
#ifdef __cplusplus
}
#endif
#endif //GPS_H
```
3. 在native层的gps.c文件中实现相关的函数,并添加如下代码:
```
#include <jni.h>
#include <android/log.h>
#include <hardware/gps.h>
#define TAG "GPS"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)
static struct gps_device_t *s_gps_device = NULL;
static GpsCallbacks s_gps_callbacks;
static void location_callback(GpsLocation *location) {
LOGD("latitude = %f, longitude = %f", location->latitude, location->longitude);
}
JNIEXPORT void JNICALL Java_com_example_gps_GPSManager_start(JNIEnv *env, jobject instance) {
if (s_gps_device == NULL) {
hw_module_t *module;
if (hw_get_module(GPS_HARDWARE_MODULE_ID, (const hw_module_t **)&module) == 0) {
if (module->methods->open(module, GPS_HARDWARE_MODULE_ID, (hw_device_t **)&s_gps_device) == 0) {
s_gps_callbacks.location_cb = location_callback;
s_gps_device->set_position_mode(&s_gps_callbacks, GPS_POSITION_MODE_MS_BASED, 0, 0, 0);
s_gps_device->start();
}
}
}
}
JNIEXPORT void JNICALL Java_com_example_gps_GPSManager_stop(JNIEnv *env, jobject instance) {
if (s_gps_device != NULL) {
s_gps_device->stop();
s_gps_device->close();
s_gps_device = NULL;
}
}
JNIEXPORT jdouble JNICALL Java_com_example_gps_GPSManager_getLatitude(JNIEnv *env, jobject instance) {
if (s_gps_device != NULL) {
GpsLocation location;
s_gps_device->get_location(&location);
return location.latitude;
}
return 0;
}
JNIEXPORT jdouble JNICALL Java_com_example_gps_GPSManager_getLongitude(JNIEnv *env, jobject instance) {
if (s_gps_device != NULL) {
GpsLocation location;
s_gps_device->get_location(&location);
return location.longitude;
}
return 0;
}
```
4. 在Java层创建一个GPSManager类,并添加如下代码:
```
package com.example.gps;
public class GPSManager {
static {
System.loadLibrary("gps");
}
public static native void start();
public static native void stop();
public static native double getLatitude();
public static native double getLongitude();
}
```
5. 最后,在需要获取GPS信息的地方调用相关函数即可,如下:
```
GPSManager.start();
double latitude = GPSManager.getLatitude();
double longitude = GPSManager.getLongitude();
GPSManager.stop();
```
以上就是基于Android framework的native层获取GPS信息的功能实现方法。
File "/h/ziyang/project/rbp_boxplot.py", line 49, in <module> File "/h/ziyang/project/rbp_boxplot.py", line 33, in create_boxplot File "/h/ziyang/anaconda3/envs/python3.9/lib/python3.9/site-packages/matplotlib/__init__.py", line 1423, in inner return func(ax, *map(sanitize_sequence, args), **kwargs) File "/h/ziyang/anaconda3/envs/python3.9/lib/python3.9/site-packages/matplotlib/axes/_axes.py", line 3850, in boxplot bxpstats = cbook.boxplot_stats(x, whis=whis, bootstrap=bootstrap, File "/h/ziyang/anaconda3/envs/python3.9/lib/python3.9/site-packages/matplotlib/cbook/__init__.py", line 1266, in boxplot_stats stats['mean'] = np.mean(x) File "<__array_function__ internals>", line 180, in mean File "/h/ziyang/anaconda3/envs/python3.9/lib/python3.9/site-packages/numpy/core/fromnumeric.py", line 3432, in mean return _methods._mean(a, axis=axis, dtype=dtype, File "/h/ziyang/anaconda3/envs/python3.9/lib/python3.9/site-packages/numpy/core/_methods.py", line 180, in _mean ret = umr_sum(arr, axis, dtype, out, keepdims, where=where) numpy.core._exceptions._UFuncNoLoopError: ufunc 'add' did not contain a loop with signature matching types (dtype('<U19'), dtype('<U19')) -> None 出现以上error
这个错误是由于数据类型不匹配导致的。根据错误消息,似乎是在计算均值时出现了问题。可能是由于数据列表中的值被解析为字符串(dtype为'<U19'),而不是数字。这可能是因为读取文件时,数据没有被正确地转换为数值类型。
为了解决这个问题,可以在读取数据时将其转换为浮点数类型。可以使用 `float()` 函数将字符串转换为浮点数。修改 `extract_data` 函数中的代码如下:
```python
def extract_data(rbp_name):
data = []
subfolders = ['lncRNA', 'miRNA', 'mRNA', 'snoRNA', 'snRNA', 'tRNA']
for subfolder in subfolders:
folder_path = os.path.join(rbp_name, subfolder, '3.normalization')
ctrl_file = os.path.join(folder_path, f'Ctrl_{subfolder}_rpm.txt')
rep1_file = os.path.join(folder_path, f'rep1_{subfolder}_rpm.txt')
rep2_file = os.path.join(folder_path, f'rep2_{subfolder}_rpm.txt')
with open(ctrl_file, 'r') as f:
ctrl_data = [float(line.strip().split('\t')[1]) for line in f]
with open(rep1_file, 'r') as f:
rep1_data = [float(line.strip().split('\t')[1]) for line in f]
with open(rep2_file, 'r') as f:
rep2_data = [float(line.strip().split('\t')[1]) for line in f]
data.append(ctrl_data)
data.append(rep1_data)
data.append(rep2_data)
return data
```
通过将数据转换为浮点数类型,可以确保在计算均值时不会出现类型不匹配的错误。重新运行代码,应该可以避免这个错误。