c 和 java 互调

Author: durongze

build.bat

@@ -1,17 +1,19 @@
+chcp 65001
 set JAVA_HOME=D:\Program Files\Java\jdk1.8.0_60
 set PATH=%PATH%;%JAVA_HOME%\bin;E:\Android\sdk\ndk-bundle\android-ndk-r20
 java -version
 rem ndk-build NDK_PROJECT_PATH=. NDK_APPLICATION_MK=Application.mk APP_BUILD_SCRIPT=Android.mk
 
+call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat"
 mkdir dyzbuild
 pushd dyzbuild
 cmake -G "Visual Studio 14 2015 Win64" ..
-call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat"
 msbuild CppCallJni.vcxproj
 Debug\CppCallJni.exe
 dumpbin /dependents Debug\CppCallJni.exe
 popd
 
+
 echo "调试时如果报异常，记得不要点击中断，要点击继续"
 
 pause

callc/CallC.java

@@ -2,9 +2,14 @@
 
 public class CallC{
     public native String[] CInterface(String[] name, int[] age, float[] height, int num);
+    public native int CInterfaceTest();
     static {
         System.loadLibrary("CLibrary");
     }
+    public void JInterface()
+    {
+        System.out.println("JInterface");
+    }
     public static void main(String[] args){
         int idx = 0;
         int num = 2;
@@ -18,7 +23,9 @@ public static void main(String[] args){
         }
         String[] vals = new CallC().CInterface(name, age, height, num);
         for (idx = 0; idx < vals.length; ++idx){
-            System.out.println(vals[idx]);
+            System.out.println("vals:[" + idx +"]:" + vals[idx]);
         }
+        int ret = new CallC().CInterfaceTest();
+        System.out.println("ret :" + ret);
     }
 };

callc/build.bat

@@ -1,15 +1,16 @@
 set JAVA_HOME=D:\Program Files\Java\jdk1.8.0_60
-set PATH=%PATH%;%JAVA_HOME%\bin;E:\Android\sdk\ndk-bundle\android-ndk-r20
+set PATH=%PATH%;%JAVA_HOME%\bin;
+set PATH=%PATH%;E:\Android\sdk\ndk-bundle\android-ndk-r20;D:\Android\ndk\android-ndk-r19c
 javac -encoding utf-8 -d . callc.java
+javap -s com.durongze.jni.CallC
 rem javah -jni com.durongze.jni.CallC
 javac -encoding utf-8 -h . callc.java
 
 rem ndk-build NDK_PROJECT_PATH=. NDK_APPLICATION_MK=Application.mk APP_BUILD_SCRIPT=Android.mk
-
+call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat"
 mkdir dyzbuild
 pushd dyzbuild
 cmake -G "Visual Studio 14 2015 Win64" ..
-call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat"
 msbuild CLibrary.vcxproj
 popd
 

callc/com_durongze_jni_CallC.cpp

@@ -2,21 +2,74 @@
 #include <jni.h>
 /* Header for class com_durongze_jni_CallC */
 #include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
 #ifndef _Included_com_durongze_jni_CallC
 #define _Included_com_durongze_jni_CallC
+
 #ifdef __cplusplus
 #if __cplusplus
 extern "C" {
 #endif
 #endif
+
+#define LOGV(...) printf(__VA_ARGS__)
+#define LOGD(...) printf(__VA_ARGS__)
+#define LOGI(...) printf(__VA_ARGS__)
+#define LOGW(...) printf(__VA_ARGS__)
+#define LOGE(...) printf(__VA_ARGS__)
+
+void TestMain()
+{
+    int i;
+    signed char c;
+    short s;
+	float f;
+
+	c = -1;
+    f = (float)c;
+    LOGE("1. c:0x%x\n", c);
+    LOGE("1. f:%lf\n", f);
+    c = 0;
+    f = c;
+    LOGE("2. c:0x%x\n", c);
+    LOGE("2. f:%lf\n", f);
+    c = -1;
+	f = c;
+    for (int i = 0; i < 1000; i++){
+        f = f + c;
+    }
+	LOGI("3. f + c:%lf\n", f);
+	i = -1;
+	f = i;
+    for (int idx = 0; idx < 1000; idx ++){
+        f = f + i;
+    }
+    LOGI("3. f + i:%lf\n", f);
+	
+	c = 0;
+    i = 1;
+    f = (!c)*(i);
+    for (int idx = 0; idx < 5; idx++){
+        f = f + f;
+    }
+    LOGE("4. f:%lf\n", f);
+    
+    s = -1;
+    f = s;
+    LOGE("5. f:%lf\n", f);
+}
 /*
  * Class:     com_durongze_jni_CallC
  * Method:    CInterface
  * Signature: ([Ljava/lang/String;[I[FI)[Ljava/lang/String;
  */
+ //                            Java_com_example_myapplication_MainActivity_CInterface
 JNIEXPORT jobjectArray JNICALL Java_com_durongze_jni_CallC_CInterface
   (JNIEnv *env, jobject, jobjectArray names, jintArray ages, jfloatArray heights, jint num)
   {
+      TestMain();
       jobjectArray result;
       jclass intArrCls = env->FindClass("java/lang/String");
       result = env->NewObjectArray(num, intArrCls, NULL);
@@ -38,6 +91,28 @@ JNIEXPORT jobjectArray JNICALL Java_com_durongze_jni_CallC_CInterface
       return result;
   }
 
+JNIEXPORT jint JNICALL Java_com_durongze_jni_CallC_CInterfaceTest
+  (JNIEnv *env, jobject)
+  {
+      TestMain();
+      #if 0
+      FILE* fp = fopen("/data/local/tmp/test.txt", "w+");
+      if (fp == NULL) {
+          return errno;
+      }
+      char buf[64] = {"xxxxxxxxxxxxxxx"}; 
+      fwrite(buf, strlen(buf), 1, fp);
+      fclose(fp);
+      return strlen(buf);
+      #else
+	  jclass jCallC = env->FindClass("com/durongze/jni/CallC");
+	  jobject jObject = env->AllocObject(jCallC);
+	  jmethodID jMethodId = env->GetMethodID(jCallC, "JInterface", "()V");
+	  env->CallVoidMethod(jObject, jMethodId);
+      return 77;
+      #endif
+  }
+
 #ifdef __cplusplus
 #if __cplusplus
 }

callc/com_durongze_jni_CallC.h

@@ -45,6 +45,24 @@ public byte[] ReadBinary(File f) throws Exception
         }
         return data;
     }
+    
+    public byte[] ReadText(File f) throws Exception 
+    {
+        InputStream in = new FileInputStream(f);
+        byte[] data = new byte[(int)f.length()];
+        try {
+            System.out.println("f size:" + f.length());
+            in.read(data);
+            OutputStream out = new FileOutputStream(new File("d:\\xx.txt"), true);
+            // OutputStream out = new FileOutputStream(new File("d:\\xx.txt"));
+            out.write(data);
+            out.close();
+        } catch (Exception e) {
+            // System.out.println("dir:");
+        }
+        return data;
+    }
+    
     public void ProcAllFile(File[] fileList) throws Exception 
     {
         System.out.println("ShowFilePath");