Android的字符编码转换问题，Unicode，GB2312，UTF8等

1. /* jernymy 2011-12-01
2. * Android word encoder process, need libicuuc.so Api
3. * just a example
4. **/ 
5.  
6. /*--------------------------- tst.cpp ---------------------------*/ 
7. /* use dl API include file */ 
8. #include <dlfcn.h> 
9.  
10. /* typedef a function pointer to pointer ucnv_convert method */ 
11.  
12. #ifndef LPCSTR 
13. typedef constchar*     LPCSTR; 
14. #endif 
15.  
16. #ifndef LPSTR 
17. typedef       char*    LPSTR; 
18. #endif 
19.  
20. #ifndef s32 
21. typedef unsigned long   s32; 
22. #endif 
23.  
24. typedef void (*pvUcnvFunc) 
25.     (LPCSTR lpcstrDstEcd,LPCSTR lpcstrSrcEcd, 
26.      LPSTR lpstrOut, s32 nOutLen, 
27.      LPCSTR lpstrIn, s32 nInLen, s32 *pnErrCode); 
28.  
29. /* ucnv_convert method pointer */ 
30. static pvUcnvFunc g_pvUcnvConvert = NULL; 
31.  
32. /* pointer libicuuc.so dl lib */ 
33. static void*      g_pvUcnvDll = NULL; 
34.  
35. /*
36. see the source code define
37. int32_t  ucnv_convert(  const char *toConverterName,
38.                         const char *fromConverterName,
39.                         char *target,
40.                         int32_t targetSize,
41.                         const char *source,
42.                         int32_t sourceSize,
43.                         UErrorCode * err)
44. */ 
45.  
46. void UcnvConvert(LPSTR lpstrOut, s32 nOutLen,LPCSTR lpstrIn, s32 *pnErrC) 
47. { 
48.     /* load so for word convert */ 
49.     if (NULL == g_pvUcnvDll) 
50.     { 
51.         g_pvUcnvDll = dlopen("/system/lib/libicuuc.so", RTLD_LAZY);   
52.     } 
53.      
54.     if (NULL == g_pvUcnvDll) 
55.     { 
56.         LOGE("(NULL == g_pvUcnvDll)"); 
57.         return; 
58.     } 
59.      
60.     /* get convert Api pointer */ 
61.     if (NULL == g_pvUcnvConvert) 
62.     { 
63.         /* here is Android 2.2 version, Android 2.1 version change to ucnv_convert_3_8 */ 
64.         g_pvUcnvConvert = (pvUcnvFunc)dlsym(g_pvUcnvDll, "ucnv_convert_4_2"); 
65.     } 
66.     if (NULL == g_pvUcnvConvert) 
67.     { 
68.         LOGE("(NULL == g_pvUcnvConvert)"); 
69.         return; 
70.     } 
71.      
72.     /*
73.      * utf8   --> the Destination encoder
74.      * gb2312 --> the Source      encoder
75.     **/ 
76.     g_pvUcnvConvert("utf8", "gb2312", lpstrOut, nOutLen, lpstrIn, strlen(lpstrIn), pnErrC);   
77. } 
78. /*--------------------------- tst.cpp ---------------------------*/ 
79.  
80.  
81. /*--------------------------- Android.mk ---------------------------*/ 
82. # android for nc makefile 
83. LOCAL_PATH := $(call my-dir) 
84. include $(CLEAR_VARS) 
85.  
86. # current path, local path jni/ 
87. COMN_PATH    := $(LOCAL_PATH)/../../../10-common 
88.  
89. LOCAL_CFLAGS += -D_LINUX_ -g -fno-rtti -fno-short-enums -D_ANDROID_ 
90.  
91. LOCAL_CPP_EXTENSION := .cpp 
92.  
93. LOCAL_C_INCLUDES := \ 
94.  
95. LOCAL_LDLIBS :=-L$(SYSROOT)/usr/lib -llog -ldl 
96.  
97. LOCAL_MODULE    := tst 
98.  
99. LOCAL_SRC_FILES := tst.cpp 
100.  
101. include $(BUILD_SHARED_LIBRARY) 
102. /*--------------------------- Android.mk ---------------------------*/