从头构建android 本地C++语言可执行程序

原创

openser 2012-03-05 16:32:25 博主文章分类：framework ©著作权

文章标签 职场休闲 android 本地 c c++ 文章分类 Android 移动开发

©著作权归作者所有：来自51CTO博客作者openser的原创作品，谢绝转载，否则将追究法律责任

此程序的功能为对android 提供的log功能进行封装，提供统一的接口函数

droid_log(LOG_DEBUG,,,,,);

可以根据开关决定log的打印级别（修改logger.h 中的LOGLEVEL 宏），从低到高为五个：

LOG_VERBOSE， LOG_DEBUG,LOG_NOTICE, LOG_WARNING, LOG_ERROR, LOG_ERROR.

通过logcat可以看到打印级别，时间戳，函数名，文件名，以及根据不同级别的语法高亮显示。

使用例子：

droid_log(LOG_DEBUG, "test debug\n");

第一个参数为上面提到的五个level, 后面为可变参数列表，与printf类似。

此功能在android上编译，把源码包放在external/下面，mm即可编译。

目录结构：

/android/external/hello

├── Android.mk

├── CleanSpec.mk

├── include

│ └── logger.h

└── src

├── Android.mk

├── hello.cpp

└── logger.cpp

代码：

logger.h

/*! \file

* \brief Logging routines,Support for logging to console.

* \author openser <openser@yeah.net>

* \extref android/log.h

* - this is a wraper for android log, user may see log in logcat.

* - utility-related API functions, used by internal.

* -

* \ref none

#ifndef _LOGGER_H_

#define _LOGGER_H_

#include <android/log.h>

#include <stdio.h>

#include <unistd.h>

#include <sys/time.h>

#include <time.h>

#include <stdarg.h>

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#define LOGLEVEL 5

#define ESC 0x1b

#define ATTR_RESET 0

#define ATTR_BRIGHT 1

#define ATTR_DIM 2

#define ATTR_UNDER 4

#define ATTR_BLINK 5

#define ATTR_REVER 7

#define ATTR_HIDDEN 8

/* termanal color define */

#define COLOR_BLACK 30

#define COLOR_GRAY (30 | 128)

#define COLOR_RED 31

#define COLOR_BRRED (31 | 128)

#define COLOR_GREEN 32

#define COLOR_BRGREEN (32 | 128)

#define COLOR_BROWN 33

#define COLOR_YELLOW (33 | 128)

#define COLOR_BLUE 34

#define COLOR_BRBLUE (34 | 128)

#define COLOR_MAGENTA 35

#define COLOR_BRMAGENTA (35 | 128)

#define COLOR_CYAN 36

#define COLOR_BRCYAN (36 | 128)

#define COLOR_WHITE 37

#define COLOR_BRWHITE (37 | 128)

/* log level define */

#define _LOG_ __FILE__, __LINE__ ,__PRETTY_FUNCTION__

#ifdef LOG_VERBOSE

#undef LOG_VERBOSE

#endif

#ifdef LOG_VERBOSE

#undef LOG_VERBOSE

#endif

#define LOG_VERBOSE 0

#define LOGGER_VERBOSE LOG_VERBOSE, _LOG_

#ifdef LOG_DEBUG

#undef LOG_DEBUG

#endif

#ifdef LOG_DEBUG

#undef LOG_DEBUG

#endif

#define LOG_DEBUG 1

#define LOGGER_DEBUG LOG_DEBUG, _LOG_

#ifdef LOG_NOTICE

#undef LOG_NOTICE

#endif

#define LOG_NOTICE 2

#define LOGGER_NOTICE LOG_NOTICE, _LOG_

#ifdef LOG_WARNING

#undef LOG_WARNING

#endif

#ifdef LOG_WARNING

#undef LOG_WARNING

#endif

#define LOG_WARNING 3

#define LOGGER_WARNING LOG_WARNING, _LOG_

#ifdef LOG_ERROR

#undef LOG_ERROR

#endif

#ifdef LOG_ERROR

#undef LOG_ERROR

#endif

#define LOG_ERROR 4

#define LOGGER_ERROR LOG_ERROR, _LOG_

extern const char *loglevels[];

extern int colors[];

extern char dateformat[256];

/* out put time in a format */

void print_time();

/* fileter special sequeces ,such as ESC */

void term_filter_escapes(char *line);

/* copy string , This is similar to strncpy, with two important differences:

- the destination buffer will always be null-terminated

- the destination buffer is not filled with zeros past the copied string length

void tsk_copy_string(char *dst, const char *src, size_t size);

/* format the input sring to specific color */

char *term_color(char *outbuf, const char *inbuf, int fgcolor, int bgcolor, int maxout);

/* out put log to console in diff level

the level is : LOG_DEBUG, LOG_NOTICE, LOG_VERBOSE, LOG_ERROR, LOG_WARNING

an out put example :[Jan 2 04:55:55] DEBUG[1604]: src/transactions/tsip_transac_layer.c:282 tsip_transac_layer

void _droid_log(int level, const char *file, int line, const char *function, const char *fmt, ...);

/*put a sring to console*/

void tsk_console_puts(char *str);

/*!

* \brief Log a DEBUG message

* \param level The minimum value of LOGLEVEL for this message

* to get logcat

#define droid_log(level, ...) do { \

if (level <= (LOGLEVEL) ) { \

if(level == 0) \

_droid_log(LOGGER_VERBOSE, __VA_ARGS__); \

else if( level == 1) \

_droid_log(LOGGER_DEBUG, __VA_ARGS__); \

else if(level == 2) \

_droid_log(LOGGER_NOTICE, __VA_ARGS__); \

else if(level == 3) \

_droid_log(LOGGER_WARNING, __VA_ARGS__); \

else if(level == 4) \

_droid_log(LOGGER_ERROR, __VA_ARGS__); \

else \

_droid_log(LOGGER_DEBUG, __VA_ARGS__); \

} \

} while (0)

#endif

logger.cpp

/*! \file

* \brief Logging routines,Support for logging to console.

* \author openser <openser@yeah.net>

* \extref android/log.h

* - this is a wraper for android log, user may see log in logcat.

* - utility-related API functions, used by internal ccdt.

* -

* \ref none

#include "logger.h"

#include <android/log.h>

/* log level definition */

const char *loglevels[] = {

"VERBOSE",

"DEBUG",

"NOTICE",

"WARNING",

"ERROR",

};

/* used by term_color */

int colors[] = {

COLOR_GREEN,

COLOR_BRGREEN,

COLOR_YELLOW,

COLOR_BRRED,

COLOR_RED,

COLOR_BRBLUE,

COLOR_BRGREEN,

};

/* date format , example : Jan 2 04:55:55*/

char dateformat[256] = "%b %e %T";

void print_time()

{

struct timeval tv;

struct tm* ptm;

char time_str[128];

long milliseconds;

gettimeofday(&tv, NULL);

ptm = localtime(&tv.tv_sec);

strftime(time_str, sizeof(time_str), "%Y-%m-%d %H:%M:%S", ptm);

milliseconds = tv.tv_sec/1000;

printf("%s.%03ld\n", time_str, milliseconds);

}

void tsk_copy_string(char *dst, const char *src, size_t size)

{

while(*src && size) {

*dst++ = *src++;

size--;

}

if(__builtin_expect(!size, 0))

dst--;

*dst = '\0';

}

void tsk_console_puts(char *str)

{

fprintf(stderr,"%s", str);

fflush(stderr);

}

void term_filter_escapes(char *line)

{

int i;

int len = strlen(line);

for (i = 0; i < len; i++) {

if (line[i] != ESC)

continue;

if ((i < (len - 2)) &&

(line[i + 1] == 0x5B)) {

switch (line[i + 2]) {

case 0x30:

case 0x31:

case 0x33:

continue;

}

/* replace ESC with a space */

line[i] = ' ';

}

char *term_color(char *outbuf, const char *inbuf, int fgcolor, int bgcolor, int maxout)

{

int attr=0;

char tmp[40];

memset(outbuf, 0, maxout);

if (!fgcolor && !bgcolor) {

tsk_copy_string(outbuf, inbuf, maxout);

return outbuf;

}

if ((fgcolor & 128) && (bgcolor & 128)) {

/* Can't both be highlighted */

tsk_copy_string(outbuf, inbuf, maxout);

return outbuf;

}

if (!bgcolor)

bgcolor =COLOR_BLACK;

if (bgcolor) {

bgcolor &= ~128;

bgcolor += 10;

}

if (fgcolor & 128) {

attr = ATTR_BRIGHT;

fgcolor &= ~128;

}

if (fgcolor && bgcolor) {

snprintf(tmp, sizeof(tmp), "%d;%d", fgcolor, bgcolor);

} else if (bgcolor) {

snprintf(tmp, sizeof(tmp), "%d", bgcolor);

} else if (fgcolor) {

snprintf(tmp, sizeof(tmp), "%d", fgcolor);

}

if (attr) {

snprintf(outbuf, maxout, "%c[%d;%sm%s%c[0;%d;%dm", ESC, attr, tmp, inbuf, ESC,

COLOR_WHITE, COLOR_BLACK + 10);

} else {

snprintf(outbuf, maxout, "%c[%sm%s%c[0;%d;%dm", ESC, tmp, inbuf, ESC, COLOR_WHITE,

COLOR_BLACK + 10);

}

return outbuf;

}

void _droid_log(int level, const char *file, int line, const char *function, const char *fmt, ...)

{

if(level > LOGLEVEL){

return;

}

time_t t;

struct tm *tm;

char date[64];

char linestr[64];

char tmp1[64];

char buf[256];

char buf1[256];

char msg[512];

int res;

va_list ap;

t = time(NULL);

tm = localtime(&t);

memset(date, 0, sizeof(date));

memset(buf, 0, sizeof(buf));

memset(buf1, 0, sizeof(buf1));

memset(msg, 0, sizeof(msg));

strftime(date, sizeof(date), dateformat, tm);

snprintf(linestr,sizeof(linestr),"%d", line);

snprintf(buf,sizeof(buf),"[%s] %s[%ld]: %s %s: ",date,term_color(tmp1, loglevels[level], colors[level], 0, sizeof(tmp1)),(long)getpid(),

linestr, function);

term_filter_escapes(buf);

va_start(ap, fmt);

res = vsnprintf(buf1,sizeof(buf1) - 1,fmt, ap);

va_end(ap);

snprintf(msg, sizeof(msg) -1, "%s%s",buf,buf1);

__android_log_print(ANDROID_LOG_DEBUG, "%s",msg);

}

# src/Android.mk

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \

hello.cpp logger.cpp

LOCAL_MODULE_TAGS:= optional

LOCAL_C_INCLUDES := external/hello/include

LOCAL_MODULE:= hello

LOCAL_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libutils

include $(BUILD_EXECUTABLE)

============

文件 hello/Android.mk

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional

include $(call all-makefiles-under,$(LOCAL_PATH))

文件 src/hello.cpp :

#include "logger.h"

int main(int argc, char **argv)

{

droid_log(LOG_DEBUG, "test debug\n");

return 0;

}

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