Androidの文字コード変換問題、Unicode、GB 2312、UTF 8など

/* jernymy 2011-12-01
 * Android word encoder process, need libicuuc.so Api
 * just a example
**/

/*--------------------------- tst.cpp ---------------------------*/
/* use dl API include file */
#include <dlfcn.h>

/* typedef a function pointer to pointer ucnv_convert method */

#ifndef LPCSTR
typedef const char*     LPCSTR;
#endif

#ifndef LPSTR
typedef       char*     LPSTR;
#endif

#ifndef s32
typedef unsigned long   s32;
#endif

typedef void (*pvUcnvFunc)
	(LPCSTR lpcstrDstEcd, LPCSTR lpcstrSrcEcd,
	 LPSTR lpstrOut, s32 nOutLen,
	 LPCSTR lpstrIn, s32 nInLen, s32 *pnErrCode);

/* ucnv_convert method pointer */
static pvUcnvFunc g_pvUcnvConvert = NULL;

/* pointer libicuuc.so dl lib */
static void*      g_pvUcnvDll = NULL;

/*
see the source code define
int32_t  ucnv_convert(  const char *toConverterName,
						const char *fromConverterName,
						char *target,
						int32_t targetSize,
						const char *source,
						int32_t sourceSize,
						UErrorCode * err)
*/

void UcnvConvert(LPSTR lpstrOut, s32 nOutLen, LPCSTR lpstrIn, s32 *pnErrC)
{
	/* load so for word convert */
	if (NULL == g_pvUcnvDll)
	{
		g_pvUcnvDll = dlopen("/system/lib/libicuuc.so", RTLD_LAZY);  
	}
	
	if (NULL == g_pvUcnvDll)
	{
		LOGE("(NULL == g_pvUcnvDll)");
		return;
	}
	
	/* get convert Api pointer */
	if (NULL == g_pvUcnvConvert)
	{
		/* here is Android 2.2 version, Android 2.1 version change to ucnv_convert_3_8 */
		g_pvUcnvConvert = (pvUcnvFunc)dlsym(g_pvUcnvDll, "ucnv_convert_4_2");
	}
	if (NULL == g_pvUcnvConvert)
	{
		LOGE("(NULL == g_pvUcnvConvert)");
		return;
	}
	
    /*
     * utf8   --> the Destination encoder
     * gb2312 --> the Source      encoder
    **/
    g_pvUcnvConvert("utf8", "gb2312", lpstrOut, nOutLen, lpstrIn, strlen(lpstrIn), pnErrC);  
}
/*--------------------------- tst.cpp ---------------------------*/


/*--------------------------- Android.mk ---------------------------*/
# android for nc makefile
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

# current path, local path jni/
COMN_PATH    := $(LOCAL_PATH)/../../../10-common

LOCAL_CFLAGS += -D_LINUX_ -g -fno-rtti -fno-short-enums -D_ANDROID_

LOCAL_CPP_EXTENSION := .cpp

LOCAL_C_INCLUDES := \

LOCAL_LDLIBS :=-L$(SYSROOT)/usr/lib -llog -ldl

LOCAL_MODULE    := tst

LOCAL_SRC_FILES := tst.cpp

include $(BUILD_SHARED_LIBRARY)
/*--------------------------- Android.mk ---------------------------*/