LoadLibrary方式載入DLL模版程式碼
阿新 • • 發佈：2019-01-04
本文貼出了我之前寫的讀取身份證資訊的程式碼。程式碼使用LoadLibrary函式載入DLL。
旨在以後寫動態載入DLL的程式碼時，參考此程式碼。
程式碼如下：
IDCardRead.h
#ifndef _ID_CARD_READ_H_ #define _ID_CARD_READ_H_ typedef int (WINAPI *WLT_GetBmp)(char *sWltFile, int nType); typedef int (WINAPI *SDT_OpenPort)(int nPort); typedef int (WINAPI *SDT_ClosePort)(int nPort); typedef int (WINAPI *SDT_StartFindIDCard)(int nPort, unsigned char *pRAPDU, int nIfOpen); typedef int (WINAPI *SDT_SelectIDCard)(int nPort, unsigned char *pRAPDU, int nIfOpen); typedef int (WINAPI *SDT_ReadBaseMsg)(int nPort, unsigned char *pCHMsg, unsigned int *pCHMsgLength, unsigned char *pPHMsg, unsigned int *pPHMsgLength, int nIfOpen); typedef struct _ID_CARD_INFORMATION_ { wchar_t szName[32]; wchar_t szGender[2]; wchar_t szNation[32]; wchar_t szBirth[32]; wchar_t szAddress[128]; wchar_t szIDCode[32]; wchar_t szAuthority[32]; wchar_t szIssueDay[32]; wchar_t szExpiryDay[32]; wchar_t szPhotoPath[128]; }ID_CARD_INFORMATION; class IDCardRead { public: /** * return 0; success * return -1; sdtapi.dll load failed * return -2; WltRS.dll load failed * return -3; load function in sdtapi.dll failed * return -4; load function in WltRS.dll failed */ static int Initialize(); static void Uninitialize(); /** * return 0; success * return -1; Init parameter is not right, may be Initialize function return failed * return -2; connect device failed, may be id card reader device is not connected with computer. * */ int ConnectDevice(); /** * return 0; success * return -1; Init parameter is not right, may be Initialize function return failed * return -2; disconnect device failed, may be device is not connect or ConnectDevice function is not * called before. * */ int DisconnectDevice(); /** * return 0; success * return -1; Init parameter is not right, may be Initialize function return failed * return -2; detect card failed. no card. * return -3; find card, but select card failed * return -4; device is not connect * */ int DetectCard(); //trim right space; void TrimRight(wchar_t *sInput); void GetNationFromCode(wchar_t *sNation, int nNationCode); /** * return 0; success * return -1; Init parameter is not right, may be Initialize function return failed * return -2; pInfo is NULL * return -3; device is not connect * return -4; read base information failed */ int GetCardInformation(ID_CARD_INFORMATION *pInfo); public: IDCardRead(); ~IDCardRead(); private: static WLT_GetBmp ms_fpWLT_GetBmp; static SDT_OpenPort ms_fpSDT_OpenPort; static SDT_ClosePort ms_fpSDT_ClosePort; static SDT_StartFindIDCard ms_fpSDT_StartFindIDCard; static SDT_SelectIDCard ms_fpSDT_SelectIDCard; static SDT_ReadBaseMsg ms_fpSDT_ReadBaseMsg; static HMODULE ms_hSDTAPI; static HMODULE ms_hWltRS; int m_nDevicePort; }; #endif//_ID_CARD_READ_H_
IDCardRead.cpp
#include "stdafx.h" #include "IDCardRead.h" WLT_GetBmp IDCardRead::ms_fpWLT_GetBmp = NULL; SDT_OpenPort IDCardRead::ms_fpSDT_OpenPort = NULL; SDT_ClosePort IDCardRead::ms_fpSDT_ClosePort = NULL; SDT_StartFindIDCard IDCardRead::ms_fpSDT_StartFindIDCard = NULL; SDT_SelectIDCard IDCardRead::ms_fpSDT_SelectIDCard = NULL; SDT_ReadBaseMsg IDCardRead::ms_fpSDT_ReadBaseMsg = NULL; HMODULE IDCardRead::ms_hSDTAPI = NULL; HMODULE IDCardRead::ms_hWltRS = NULL; IDCardRead::IDCardRead() : m_nDevicePort(0) { // } IDCardRead::~IDCardRead() { // } int IDCardRead::Initialize() { int nReturn = -1; do { ms_hSDTAPI = LoadLibraryW(L"sdtapi.dll"); if (ms_hSDTAPI == NULL) { nReturn = -1; break; } ms_hWltRS = LoadLibraryW(L"WltRS.dll"); if (ms_hWltRS == NULL) { nReturn = -2; break; } ms_fpSDT_OpenPort = (SDT_OpenPort)GetProcAddress(ms_hSDTAPI, "SDT_OpenPort"); ms_fpSDT_ClosePort = (SDT_ClosePort)GetProcAddress(ms_hSDTAPI, "SDT_ClosePort"); ms_fpSDT_StartFindIDCard = (SDT_StartFindIDCard)GetProcAddress(ms_hSDTAPI, "SDT_StartFindIDCard"); ms_fpSDT_SelectIDCard = (SDT_SelectIDCard)GetProcAddress(ms_hSDTAPI, "SDT_SelectIDCard"); ms_fpSDT_ReadBaseMsg = (SDT_ReadBaseMsg)GetProcAddress(ms_hSDTAPI, "SDT_ReadBaseMsg"); if ( (ms_fpSDT_OpenPort == NULL) || (ms_fpSDT_ClosePort == NULL) || (ms_fpSDT_StartFindIDCard == NULL) || (ms_fpSDT_SelectIDCard == NULL) || (ms_fpSDT_ReadBaseMsg == NULL) ) { nReturn = -3; break; } ms_fpWLT_GetBmp = (WLT_GetBmp)GetProcAddress(ms_hWltRS, "GetBmp"); if (ms_fpWLT_GetBmp == NULL) { nReturn = -4; break; } nReturn = 0; } while (false); if (nReturn != 0) { //clean ms_fpWLT_GetBmp = NULL; ms_fpSDT_OpenPort = NULL; ms_fpSDT_ClosePort = NULL; ms_fpSDT_StartFindIDCard = NULL; ms_fpSDT_SelectIDCard = NULL; ms_fpSDT_ReadBaseMsg = NULL; if (ms_hSDTAPI != NULL) { FreeLibrary(ms_hSDTAPI); ms_hSDTAPI = NULL; } if (ms_hWltRS != NULL) { FreeLibrary(ms_hWltRS); ms_hWltRS = NULL; } } return nReturn; } void IDCardRead::Uninitialize() { ms_fpWLT_GetBmp = NULL; ms_fpSDT_OpenPort = NULL; ms_fpSDT_ClosePort = NULL; ms_fpSDT_StartFindIDCard = NULL; ms_fpSDT_SelectIDCard = NULL; ms_fpSDT_ReadBaseMsg = NULL; if (ms_hSDTAPI != NULL) { FreeLibrary(ms_hSDTAPI); ms_hSDTAPI = NULL; } if (ms_hWltRS != NULL) { FreeLibrary(ms_hWltRS); ms_hWltRS = NULL; } } int IDCardRead::ConnectDevice() { int nReturn = -1; if (ms_fpSDT_OpenPort != NULL) { m_nDevicePort = 0; // detect from usb for (int nPort = 1001; nPort <= 1016; nPort ++) { if (ms_fpSDT_OpenPort(nPort) == 0x90) { m_nDevicePort = nPort; break; } } /* dll have bug. if (m_nDevicePort == 0) {//dectect from usb failed, dectect from COM for (int nPort = 1; nPort <= 16; nPort ++) { if (ms_fpSDT_OpenPort(nPort) == 0x90) { m_nDevicePort = nPort; break; } } } */ if (m_nDevicePort != 0) { nReturn = 0; } else { nReturn = -2; } } else { nReturn = -1; } return nReturn; } int IDCardRead::DisconnectDevice() { int nReturn = -1; if (ms_fpSDT_ClosePort != NULL) { if (m_nDevicePort != 0) { if (ms_fpSDT_ClosePort(m_nDevicePort) == 0x90) { nReturn = 0; } else { nReturn = -2; } m_nDevicePort = 0; } else { nReturn = -2; } } else { nReturn = -1; } return nReturn; } int IDCardRead::DetectCard() { int nReturn = -1; if ( (ms_fpSDT_StartFindIDCard != NULL) && (ms_fpSDT_SelectIDCard != NULL) ) { if (m_nDevicePort != 0) { unsigned char szRAPDU[4]; if (ms_fpSDT_StartFindIDCard(m_nDevicePort, szRAPDU, 0) == 0x9F) { unsigned char szRAPDUSelect[8]; if (ms_fpSDT_SelectIDCard(m_nDevicePort, szRAPDUSelect, 0) == 0x90) { nReturn = 0; } else { nReturn = -3; } } else { nReturn = -2; } } else { nReturn = -4; } } else { nReturn = -1; } return nReturn; } void IDCardRead::TrimRight(wchar_t *sInput) { if (sInput != NULL) { int nEnd = wcslen(sInput) - 1; while (nEnd > 0) { if (sInput[nEnd] == L' ') { sInput[nEnd] = L'\0'; nEnd --; } else { break; } } } } void IDCardRead::GetNationFromCode(wchar_t *sNation, int nNationCode) { switch (nNationCode) { case 1: wcscpy(sNation, L"漢"); break; case 2: wcscpy(sNation, L"蒙古"); break; case 3: wcscpy(sNation, L"回"); break; case 4: wcscpy(sNation, L"藏"); break; case 5: wcscpy(sNation, L"維吾爾"); break; case 6: wcscpy(sNation, L"苗"); break; case 7: wcscpy(sNation, L"彝"); break; case 8: wcscpy(sNation, L"壯"); break; case 9: wcscpy(sNation, L"布依"); break; case 10: wcscpy(sNation, L"朝鮮"); break; case 11: wcscpy(sNation, L"滿"); break; case 12: wcscpy(sNation, L"侗"); break; case 13: wcscpy(sNation, L"瑤"); break; case 14: wcscpy(sNation, L"白"); break; case 15: wcscpy(sNation, L"土家"); break; case 16: wcscpy(sNation, L"哈尼"); break; case 17: wcscpy(sNation, L"哈薩克"); break; case 18: wcscpy(sNation, L"傣"); break; case 19: wcscpy(sNation, L"黎"); break; case 20: wcscpy(sNation, L"傈僳"); break; case 21: wcscpy(sNation, L"佤"); break; case 22: wcscpy(sNation, L"畲"); break; case 23: wcscpy(sNation, L"高山"); break; case 24: wcscpy(sNation, L"拉祜"); break; case 25: wcscpy(sNation, L"水"); break; case 26: wcscpy(sNation, L"東鄉"); break; case 27: wcscpy(sNation, L"納西"); break; case 28: wcscpy(sNation, L"景頗"); break; case 29: wcscpy(sNation, L"柯爾克孜"); break; case 30: wcscpy(sNation, L"土"); break; case 31: wcscpy(sNation, L"達斡爾"); break; case 32: wcscpy(sNation, L"仫佬"); break; case 33: wcscpy(sNation, L"羌"); break; case 34: wcscpy(sNation, L"布朗"); break; case 35: wcscpy(sNation, L"撒拉"); break; case 36: wcscpy(sNation, L"毛南"); break; case 37: wcscpy(sNation, L"仡佬"); break; case 38: wcscpy(sNation, L"錫伯"); break; case 39: wcscpy(sNation, L"阿昌"); break; case 40: wcscpy(sNation, L"普米"); break; case 41: wcscpy(sNation, L"塔吉克"); break; case 42: wcscpy(sNation, L"怒"); break; case 43: wcscpy(sNation, L"烏孜別克"); break; case 44: wcscpy(sNation, L"俄羅斯"); break; case 45: wcscpy(sNation, L"鄂溫克"); break; case 46: wcscpy(sNation, L"德昂"); break; case 47: wcscpy(sNation, L"保安"); break; case 48: wcscpy(sNation, L"裕固"); break; case 49: wcscpy(sNation, L"京"); break; case 50: wcscpy(sNation, L"塔塔爾"); break; case 51: wcscpy(sNation, L"獨龍"); break; case 52: wcscpy(sNation, L"鄂倫春"); break; case 53: wcscpy(sNation, L"赫哲"); break; case 54: wcscpy(sNation, L"門巴"); break; case 55: wcscpy(sNation, L"珞巴"); break; case 56: wcscpy(sNation, L"基諾"); break; case 97: wcscpy(sNation, L"其他"); break; case 98: wcscpy(sNation, L"外國血統中國籍人士"); break; default: wcscpy(sNation, L""); break; } } int IDCardRead::GetCardInformation(ID_CARD_INFORMATION *pInfo) { int nReturn = -1; if ( (ms_fpSDT_ReadBaseMsg != NULL) && (ms_fpWLT_GetBmp != NULL) ) { if (pInfo != NULL) { if (m_nDevicePort != 0) { unsigned char szCHMsg[512]; unsigned char szPHMsg[1024]; unsigned int nCHMsg = 512; unsigned int nPHMsg = 1024; if (ms_fpSDT_ReadBaseMsg(m_nDevicePort, szCHMsg, &nCHMsg, szPHMsg, &nPHMsg, 0) == 0x90) { memset(pInfo, 0, sizeof(ID_CARD_INFORMATION)); //name memcpy(pInfo->szName, szCHMsg, 30); TrimRight(pInfo->szName); //gender memcpy(pInfo->szGender, szCHMsg+30, 2); TrimRight(pInfo->szGender); if (wcscmp(pInfo->szGender, L"1") == 0) { wcscpy(pInfo->szGender, L"男"); } else { wcscpy(pInfo->szGender, L"女"); } //nation memcpy(pInfo->szNation, szCHMsg+32, 4); TrimRight(pInfo->szNation); GetNationFromCode(pInfo->szNation, _wtoi(pInfo->szNation)); //birth memcpy(pInfo->szBirth, szCHMsg+36, 16); TrimRight(pInfo->szBirth); //address memcpy(pInfo->szAddress, szCHMsg+52, 70); TrimRight(pInfo->szAddress); //idcode memcpy(pInfo->szIDCode, szCHMsg+122, 36); TrimRight(pInfo->szIDCode); //authority memcpy(pInfo->szAuthority, szCHMsg+158, 30); TrimRight(pInfo->szAuthority); //issue day memcpy(pInfo->szIssueDay, szCHMsg+188, 16); TrimRight(pInfo->szIssueDay); //expiry day memcpy(pInfo->szExpiryDay, szCHMsg+204, 16); TrimRight(pInfo->szExpiryDay); //photo path FILE *hFile = fopen("C:\\sfzhead.wlt", "w+b"); if (hFile != NULL) { fwrite(szPHMsg, 1, nPHMsg, hFile); fclose(hFile); } ms_fpWLT_GetBmp("C:\\sfzhead.wlt", 2); wcscpy(pInfo->szPhotoPath, L"C:\\sfzhead.bmp"); nReturn = 0; } else { nReturn = -4; } } else { nReturn = -3; } } else { nReturn = -2; } } else { nReturn = -1; } return nReturn; }
關注點：
1、定義函式指標方法。
如typedef int (WINAPI *SDT_OpenPort)(int nPort);
2、定義static函式指標變數。
如static SDT_OpenPort ms_fpSDT_OpenPort;
3、靜態的初始，反初始函式。
如
static int Initialize();
static void Uninitialize();