C++动态库中调用sqlcipherbd.dll

C++代码

sqlite.h

extern "C" __declspec(dllexport)int  sqlite3_open(const char *zFilename, void **ppDb);extern "C" __declspec(dllexport)int sqlite3_close(void *db);extern "C" __declspec(dllexport)int sqlite3_key(void *db, const char *pKey, int nKey);extern "C" __declspec(dllexport)int sqlite3_prepare_v2(void *db, const char *zSql, int nBytes, void **ppStmt, const char **pzTail);extern "C" __declspec(dllexport)int sqlite3_step(void *pStmt);extern "C" __declspec(dllexport)int sqlite3_finalize(void *pStmt);extern "C" __declspec(dllexport)const char *sqlite3_errmsg(void *db);extern "C" __declspec(dllexport)int sqlite3_column_count(void *pStmt);extern "C" __declspec(dllexport)const char *sqlite3_column_name(void *pStmt, int N);extern "C" __declspec(dllexport)int sqlite3_column_type(void *pStmt, int i);extern "C" __declspec(dllexport)int sqlite3_column_int(void *pStmt, int i);extern "C" __declspec(dllexport)char *sqlite3_column_text(void *pStmt, int i);extern "C" __declspec(dllexport)double sqlite3_column_double(void *pStmt, int i);extern "C" __declspec(dllexport)void *sqlite3_column_blob(void *pStmt, int i);extern "C" __declspec(dllexport)int sqlite3_column_bytes(void *pStmt, int i);extern "C" __declspec(dllexport)int sqlite3_bind_double(void *pStmt, int i, double rValue);extern "C" __declspec(dllexport)int sqlite3_bind_int(void *p, int i, int iValue);extern "C" __declspec(dllexport)int sqlite3_bind_text(void *pStmt, int i, const char *zData, int nData, void *xDel);extern "C" __declspec(dllexport)int sqlite3_bind_blob(void *pStmt, int i, const void *zData, int nData, void *xDel);extern "C" __declspec(dllexport) int  Add(int a, int b);

sqlite.cpp

#include<string.h> #include<stdio.h>#include<stdlib.h>#include <iostream>#include <Windows.h>#include "sqlite.h"HINSTANCE handle;const char *IKey = "[加密的密码]";int  Add(int a, int b){return a + b;}int IndexOf(char *strSource, char *strFind){char *p = strSource;int i = 0;p = strstr(strSource, strFind);if (p == NULL)return -1;else {while (strSource != p){strSource++;i++;}}return i;}char*subString(char *someString, int n){char *new1 = (char *)malloc(sizeof(char)*n + 1);strncpy(new1, someString, n);new1[n] = '\0';return new1;}char* joinstr(char *s1, char *s2){char *result = (char *)malloc(strlen(s1) + strlen(s2) + 1);if (result == NULL) exit(1);strcpy(result, s1);strcat(result, s2);return result;}//参数，src 字符串源，sub想要替换的字符串，dst，用来替换的字符串char*replaceFirst(char*src, char*sub, char*dst){//记录当前指针位置int pos = 0;//记录偏移int offset = 0;//字符串长度int srcLen, subLen, dstLen;//返回内容char*pRet = NULL;//求得各字符串长度srcLen = strlen(src);subLen = strlen(sub);dstLen = strlen(dst);//申请替换后的字符串缓冲区。用dst替换sub，所以应该是srclen-sublen+dstlen，+1流出'\0'位置pRet = (char*)malloc(srcLen + dstLen - subLen + 1);//(外部是否该空间)if (NULL != pRet){//strstr查找sub字符串出现的指针。该指针减去src地址。得到相对位置pos = strstr(src, sub) - src;//拷贝src字符串，从首地址开始，pos个字符。memcpy(pRet, src, pos);//增加偏移位置到posoffset += pos;//拷贝dst到返回内容中。memcpy(pRet + offset, dst, dstLen);//重新定位偏移offset += dstLen;//拷贝src中，sub字符串后面的字符串到pRet中memcpy(pRet + offset, src + pos + subLen, srcLen - pos - subLen);//重新定位偏移offset += srcLen - pos - subLen;//最后添加字符串结尾标记'\0'*(pRet + offset) = '\0';}//返回新构造的字符串return pRet;}/*** Open a new database handle.*/int sqlite3_open(const char *zFilename, void **ppDb) {typedef int(*fun)(const char *zFilename1, void **ppDb1);int s = 0;handle = LoadLibrary("sqlcipherbd.dll");// dlopen("libsqlcipher_android.so", RTLD_NOW);if (NULL == handle)return -2;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_open");s = dllFunc(zFilename, ppDb);return s;}int sqlite3_close(void *db) {typedef int(*fun)(void *db1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_close");s = dllFunc(db);FreeLibrary(handle);return s;}int sqlite3_key(void *db, const char *pKey, int nKey) {int IKeyLen = 12;typedef int(*fun)(void *db1, const char *pKey1, int nKey1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_key");s = dllFunc(db, IKey, IKeyLen);return s;}int sqlite3_prepare_v2(void *db, const char *zSql, int nBytes, void **ppStmt, const char **pzTail) {typedef int(*fun)(void *db1, const char *zSql1, int nBytes1, void **ppStmt1, const char **pzTail1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_prepare_v2");char *find = "ATTACH ";int pos = IndexOf((char *)zSql, find);if (pos == 0) {find = " KEY ";pos = IndexOf((char *)zSql, find);char *temp = subString((char *)zSql, pos);char*newSql = joinstr(temp, find);char*newPwd = joinstr(find, " '");newPwd = joinstr(newPwd, (char *)IKey);newPwd = joinstr(newPwd, "'");newSql = replaceFirst(newSql, find, newPwd);s = dllFunc(db, newSql, strlen(newSql), ppStmt, pzTail);}else {s = dllFunc(db, zSql, nBytes, ppStmt, pzTail);}return s;}int sqlite3_step(void *pStmt) {typedef int(*fun)(void *pStmt1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_step");s = dllFunc(pStmt);return s;}int sqlite3_finalize(void *pStmt) {typedef int(*fun)(void *pStmt1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_finalize");s = dllFunc(pStmt);return s;}const char *sqlite3_errmsg(void *db) {typedef const char *(*fun)(void *db1);const char *s;if (NULL == handle)return (char*)(-1);fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_errmsg");s = dllFunc(db);return s;}int sqlite3_column_count(void *pStmt) {typedef int(*fun)(void *pStmt1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_count");s = dllFunc(pStmt);return s;}const char *sqlite3_column_name(void *pStmt, int N) {typedef const char *(*fun)(void *pStmt1, int N1);const char *s;if (NULL == handle)return "";fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_name");s = dllFunc(pStmt, N);return s;}int sqlite3_column_type(void *pStmt, int i) {typedef int(*fun)(void *pStmt1, int i1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_type");s = dllFunc(pStmt, i);return s;}int sqlite3_column_int(void *pStmt, int i) {typedef int(*fun)(void *pStmt1, int i1);int s = 0;if (NULL == handle)return -1;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_int");s = dllFunc(pStmt, i);return s;}char *sqlite3_column_text(void *pStmt, int i) {typedef char *(*fun)(void *pStmt1, int i1);char *s;if (NULL == handle)return "";fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_text");s = dllFunc(pStmt, i);return s;}double sqlite3_column_double(void *pStmt, int i) {typedef double(*fun)(void *pStmt1, int i1);double s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_double");s = dllFunc(pStmt, i);return s;}void *sqlite3_column_blob(void *pStmt, int i) {typedef void *(*fun)(void *pStmt1, int i1);void *s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_blob");s = dllFunc(pStmt, i);return s;}int sqlite3_column_bytes(void *pStmt, int i) {typedef int(*fun)(void *pStmt1, int i1);int s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_column_bytes");s = dllFunc(pStmt, i);return s;}int sqlite3_bind_double(void *pStmt, int i, double rValue) {typedef int(*fun)(void *pStmt1, int i1, double rValue1);int s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_bind_double");s = dllFunc(pStmt, i, rValue);return s;}int sqlite3_bind_int(void *p, int i, int iValue) {typedef int(*fun)(void *pStmt1, int i1, int rValue1);int s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_bind_int");s = dllFunc(p, i, iValue);return s;}int sqlite3_bind_text(void *pStmt, int i, const char *zData, int nData, void *xDel) {typedef int(*fun)(void *pStmt1, int i1, const char *zData1, int nData1, void *xDel1);int s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_bind_text");s = dllFunc(pStmt, i, zData, nData, xDel);return s;}int sqlite3_bind_blob(void *pStmt, int i, const void *zData, int nData, void *xDel) {typedef int(*fun)(void *pStmt1, int i1, const char *zData1, int nData1, void *xDel1);int s;if (NULL == handle)return 0;fun dllFunc = (fun)GetProcAddress(handle, "sqlite3_bind_blob");s = dllFunc(pStmt, i, (char *)zData, nData, xDel);return s;}