Android浏览器插件开发-Log

16lz 2021-01-25

2011-08-24 11:331876人阅读评论(1)收藏举报

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android中的插件开发中的示例代码已经给我们说明了如何打log，参看示例代码main.cpp

[cpp] view plain copy

for(inti=0;i<argc;i++){
if(!strcmp(argn[i],"DrawingModel")){
if(!strcmp(argv[i],"Bitmap")){
model=kBitmap_ANPDrawingModel;
}
elseif(!strcmp(argv[i],"Surface")){
model=kSurface_ANPDrawingModel;
}
gLogI.log(kDebug_ANPLogType,"------%pDrawingModelis%d",instance,model);
break;
}
}

我们可以使用gLogI.log打印调试信息。

gLogI的定义如下

[plain] view plain copy

ANPLogInterfaceV0gLogI;

ANPLogInterfaceV0的定义如下(Android_npapi.h)

[cpp] view plain copy

structANPLogInterfaceV0:ANPInterface{
/**dumpsprintfmessagestothelogfile
e.g.interface->log(instance,kWarning_ANPLogType,"valueis%d",value);
*/
void(*log)(ANPLogType,constcharformat[],...);
};

该结构的赋值如下（ANPLogInterface.cpp）
[cpp] view plain copy

staticvoidanp_log(ANPLogTypelogType,constcharformat[],...){
va_listargs;
va_start(args,format);
android_LogPrioritypriority;
switch(logType){
casekError_ANPLogType:
priority=ANDROID_LOG_ERROR;
break;
casekWarning_ANPLogType:
priority=ANDROID_LOG_WARN;
break;
casekDebug_ANPLogType:
priority=ANDROID_LOG_DEBUG;
break;
default:
priority=ANDROID_LOG_UNKNOWN;
break;
}
LOG_PRI_VA(priority,"plugin",format,args);
va_end(args);
}
voidANPLogInterfaceV0_Init(ANPInterface*value){
ANPLogInterfaceV0*i=reinterpret_cast<ANPLogInterfaceV0*>(value);
i->log=anp_log;
}

而LOG_PRI_VA的调用关系如下

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LOG_PRI_VA@Log.h
android_vprintLog@Log.h
__android_log_vprint@Log.h
__android_log_write@logd_write.c
write_to_log@logd_write.c
__write_to_log_init@logd_write.c
__write_to_log_kernel@logd_write.c
writev@uio.c

注：

1. 插件的打印信息的channel为plugin

2. android系统据我所知，只有如下log会受到是否打开DEBUG的影响

LOGV* LOG_FATAL*

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