继续上文分析,这节来分析cocos2dx 的jni 部分: 目录为: cocos2d-x-2.1.4\cocos2dx\platform\android\jni DPIJni.cpp DPIJni.h IMEJni.cpp IMEJni.h Java_org_cocos2dx_lib_Cocos2dxAccelerometer.cpp Java_org_cocos2dx_lib_Cocos2dxBitmap.cpp Java_org_c
继续上文分析,这节来分析cocos2dx 的jni 部分:目录为:
cocos2d-x-2.1.4\cocos2dx\platform\android\jni
DPIJni.cpp
DPIJni.h
IMEJni.cpp
IMEJni.h
Java_org_cocos2dx_lib_Cocos2dxAccelerometer.cpp
Java_org_cocos2dx_lib_Cocos2dxBitmap.cpp
Java_org_cocos2dx_lib_Cocos2dxBitmap.h
Java_org_cocos2dx_lib_Cocos2dxHelper.cpp
Java_org_cocos2dx_lib_Cocos2dxHelper.h
Java_org_cocos2dx_lib_Cocos2dxRenderer.cpp
JniHelper.cpp
JniHelper.h
TouchesJni.cpp
DPIJni.cpp
获取屏幕DPI 的一个接口。
IMEJni.cpp
获取上层的输入设备,是否打开和关闭输入键盘
Java_org_cocos2dx_lib_Cocos2dxAccelerometer.cpp
单向java 调用,传递给c++,pDirector->getAccelerometer()->update(x, y, z, timeStamp);
Java_org_cocos2dx_lib_Cocos2dxBitmap.cpp
创建位图使用
Java_org_cocos2dx_lib_Cocos2dxHelper.cpp
帮助类,双向,java 调用c++ 和c++调用java
Java_org_cocos2dx_lib_Cocos2dxRenderer.cpp
渲染器,单向,java 传递给c++
JniHelper.cpp
协助类,帮助接口
TouchesJni.cpp 触屏消息传递过程
参照一个为:
JNIEXPORT void JNICALL
Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeTouchesBegin(JNIEnv * env, jobject thiz, jint id,
jfloat x, jfloat y) {
cocos2d::CCDirector::sharedDirector()->getOpenGLView()->handleTouchesBegin(1,
&id, &x, &y);
}
传递给cocos2d-x-2.1.4\cocos2dx\platform\android CCEGLView.cpp 里面,这个类继承了
CCEGLViewProtocol,这个里面可以看到处理过程
void CCEGLViewProtocol::handleTouchesBegin(int num, int ids[], float xs[], float ys[])
这个过程就完成了。
这里CCDirector.cpp 里面设置了触屏解析器
m_pobOpenGLView->setTouchDelegate(m_pTouchDispatcher);
随后CCEGLViewProtocol::handleTouchesBegin 里面调用的
m_pDelegate->touchesBegan(&set, NULL);
便会走到这里。
这一节还是讲解JNI 的本地代码与JAVA 代码之间的沟通过程,只有理解了这些概念,才能在
随后的开发过程游刃有余。
这一节就到这里,分析完毕。

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters

MySQloffersechar, Varchar, text, Anddenumforstringdata.usecharforfixed-Lengthstrings, VarcharerForvariable-Length, text forlarger text, AndenumforenforcingdataAntegritywithaetofvalues.

Optimizing MySQLBLOB requests can be done through the following strategies: 1. Reduce the frequency of BLOB query, use independent requests or delay loading; 2. Select the appropriate BLOB type (such as TINYBLOB); 3. Separate the BLOB data into separate tables; 4. Compress the BLOB data at the application layer; 5. Index the BLOB metadata. These methods can effectively improve performance by combining monitoring, caching and data sharding in actual applications.

Mastering the method of adding MySQL users is crucial for database administrators and developers because it ensures the security and access control of the database. 1) Create a new user using the CREATEUSER command, 2) Assign permissions through the GRANT command, 3) Use FLUSHPRIVILEGES to ensure permissions take effect, 4) Regularly audit and clean user accounts to maintain performance and security.

ChooseCHARforfixed-lengthdata,VARCHARforvariable-lengthdata,andTEXTforlargetextfields.1)CHARisefficientforconsistent-lengthdatalikecodes.2)VARCHARsuitsvariable-lengthdatalikenames,balancingflexibilityandperformance.3)TEXTisidealforlargetextslikeartic

Best practices for handling string data types and indexes in MySQL include: 1) Selecting the appropriate string type, such as CHAR for fixed length, VARCHAR for variable length, and TEXT for large text; 2) Be cautious in indexing, avoid over-indexing, and create indexes for common queries; 3) Use prefix indexes and full-text indexes to optimize long string searches; 4) Regularly monitor and optimize indexes to keep indexes small and efficient. Through these methods, we can balance read and write performance and improve database efficiency.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

WebStorm Mac version
Useful JavaScript development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
