c01_d_jni架構(gòu)原理_java與c的對(duì)接_ok

1、C01_dJNI架構(gòu)基原於軟理硬整合：觀點(diǎn)Java與C的對(duì)接(d)By 高煥堂4、 EIT造形的基於軟硬整合觀點(diǎn)C和Java組合實(shí)現(xiàn)函數(shù)觀點(diǎn)數(shù)據(jù)觀點(diǎn)turnOn()/.Led 燈Flash 燈turnOff()/.函數(shù)觀點(diǎn)數(shù)據(jù)觀點(diǎn)turnOn()/.turnOff()/.Light (燈)C定義Light類 對(duì)接 C函數(shù)C誕生對(duì)象&調(diào)用函數(shù)/ C代碼/ a.so 檔案(File)void turnOn( Light *obj )obj-state = 1; void turnOff( Light *obj )obj-state = 0;/ C代碼C定義Light類 對(duì)接 C函數(shù)C誕生對(duì)象&調(diào)用

2、函數(shù)struct Light*LightNew() struct Light *t = (Light *)malloc(sizeof(Light); return (void*) t;void main() Light *led = (Light*)LightNew();t-turnOn=turnOn; /*裝配C函數(shù)*/ t-turnOff = turnOff;led-turnOn( led ); /* 啟動(dòng)執(zhí)行 */ a.so 檔案(File)void turnOn( Light *obj )obj-state = 1; void turnOff( Light *obj )obj-stat

3、e = 0;typedef struct Light Light; struct Light int state;void (*turnOn)(Light*); void (*turnOff)(Light*);static void turnOn( Light *cobj )cobj-state = 1; printf(“ON”);static void turnOff( Light *cobj ) cobj-state = 0; printf(“OFF”);Java定義Light類VM JNIC函數(shù)Java誕生對(duì)象&調(diào)用函數(shù)/ Java代碼/ a.so 檔案(File)void turnOn

4、( Light *obj )obj-state = 1; void turnOff( Light *obj )obj-state = 0;/ Java代碼VM JNI static void turnOn( jobject* thiz )/ thiz-state = 1;/ printf(“ON”);static void turnOff( jobject* thiz ) / thiz-state = 0;/ printf(“OFF”); 無(wú)論是C或Java都必須將目前對(duì)象(Current Object)指針傳給C函數(shù)。 讓C函數(shù)可指向目前對(duì)象，以便存取對(duì)象的內(nèi)部屬性質(zhì)或調(diào)用類里的其它函數(shù)。目

5、前對(duì)象(Current Object)指針定義Light類撰寫(xiě)構(gòu)造式struct Light *LightNew()/ 構(gòu)造式struct Light *t;t = (Light *)malloc(sizeof(Light); return (void*) t;typedef struct Light Light; struct Light int state;void (*turnOn)(Light*); void (*turnOff)(Light*);撰寫(xiě)C函數(shù)static void turnOn( Light*cobj ) cobj-state = 1; printf(“ON”);sta

6、tic void turnOff( Light *cobj ) cobj-state = 0; printf(“OFF”);裝配&執(zhí)行void main() Light *led = (Light*)LightNew();t-turnOn = turnOn; /* 裝配C函數(shù) */ t-turnOff = turnOff;led-turnOn( led ); /* 啟動(dòng)執(zhí)行 */ led-turnOff( led );static void turnOn( Light *cobj )cobj-state = 1; printf(“ON”);static void turnOff( Light

7、*cobj ) cobj-state = 0; printf(“OFF”);Led 對(duì)接 static void turnOn( Light*cobj ) cobj-state = 1; printf(“ON”);static void turnOff( Light *cobj ) cobj-state = 0; printf(“OFF”);state： 0 or 1*turnOn()*turnOff()VM JNI static void turnOn( jobject* thiz )/ thiz-state = 1;/ printf(“ON”);static void turnOff( jobject* thiz ) / thiz-state = 0;/ printf(“OFF”); VMJNIstatic void turnOn( jobject* thiz )/ thiz-state = 1;/ printf(“O