使用c++解压rar文件，基于UnRAR64，非命令行-编程知识

最近项目需要解压缩rar文件，我们都知道rar是闭源收费软件，如果直接采用命令行可能会有限制，或者盗版问题，使用正版的winrar命令行解压rar文件是否有限制，这个我没来得及测试，但是从交互体验上来说，命令行对于很多情况的处理也不太友好，比如是否出错，比如异常处理，甚至某些高级功能，比如自定义解压缩的文件名等等，这些在命令行中不太好实现甚至无法实现。

网上很多关于c++解压rar的代码都是基于命令行的，这不是我想要的。

我想找能够解压rar的库或者dll，经过一番寻找，发现rarlab官网已经提供了UnRAR64，可以直接下载运行，这里提供一下下载地址：https://www.rarlab.com/rar/unrardll-624.exehttps://www.rarlab.com/rar/unrardll-624.exe

其他版本在这个页面：WinRAR archiver, a powerful tool to process RAR and ZIP fileshttps://www.rarlab.com/rar_add.htm

使用官方的例子，即可实现winrar的解压缩，不过为了方便使用，我拓展了一下官方的代码，可以实现列出文件和解压缩rar文件到指定的目录，修改比较简单，这里直接上代码：

#pragma once#include <windows.h>
#include <stdio.h>
#include <ctype.h>
#include <locale.h>
#include <vector>#include "unrar.h"enum { EXTRACT, TEST, PRINT, LIST };int CommandLine(int Argc, char *Argv[]);void ExtractArchive(char *ArcName,int Mode);
void ExtractArchive(char *ArcName, char* DstDir);
void ListArchive(char *ArcName);
size_t ListArchive(char *ArcName, std::vector<std::string>& vFiles);
void ShowComment(wchar_t *CmtBuf);
void OutHelp(void);enum ERR_TYPE {ERR_OPEN, ERR_READ, ERR_PROCESS};
void OutError(int Error,char *ArcName,int ErrType);void ShowArcInfo(unsigned int Flags,char *ArcName);
void PrintTime(const char *Label,unsigned int Low,unsigned int High);
void OutProcessFileError(int Error);
int CALLBACK CallbackProc(UINT msg,LPARAM UserData,LPARAM P1,LPARAM P2);

实现文件：

#define STRICT#include "UnRDLL.h"int CommandLine(int Argc, char *Argv[])
{setlocale(LC_ALL, NULL);if (Argc!=3){OutHelp();return(0);}switch(toupper(Argv[1][0])){case 'X':ExtractArchive(Argv[2],EXTRACT);break;case 'T':ExtractArchive(Argv[2],TEST);break;case 'P':ExtractArchive(Argv[2],PRINT);break;case 'L':ListArchive(Argv[2]);break;default:OutHelp();return(0);}return(0);
}void ExtractArchive(char *ArcName,int Mode)
{HANDLE hArcData;int RHCode,PFCode;wchar_t CmtBuf[16384];struct RARHeaderData HeaderData;struct RAROpenArchiveDataEx OpenArchiveData;memset(&HeaderData,0,sizeof(HeaderData));memset(&OpenArchiveData,0,sizeof(OpenArchiveData));OpenArchiveData.ArcName=ArcName;OpenArchiveData.CmtBufW=CmtBuf;OpenArchiveData.CmtBufSize=sizeof(CmtBuf)/sizeof(CmtBuf[0]);OpenArchiveData.OpenMode=RAR_OM_EXTRACT;OpenArchiveData.Callback=CallbackProc;OpenArchiveData.UserData=Mode;hArcData=RAROpenArchiveEx(&OpenArchiveData);if (OpenArchiveData.OpenResult!=0){OutError(OpenArchiveData.OpenResult,ArcName,ERR_OPEN);return;}ShowArcInfo(OpenArchiveData.Flags,ArcName);if (OpenArchiveData.CmtState==1)ShowComment(CmtBuf);while ((RHCode=RARReadHeader(hArcData,&HeaderData))==0){switch(Mode){case EXTRACT:printf("\nExtracting %-45s",HeaderData.FileName);break;case TEST:printf("\nTesting %-45s",HeaderData.FileName);break;case PRINT:printf("\nPrinting %-45s\n",HeaderData.FileName);break;}PFCode=RARProcessFile(hArcData,(Mode==EXTRACT) ? RAR_EXTRACT:RAR_TEST,NULL,NULL);if (PFCode==0)printf(" OK");else{OutError(PFCode,ArcName,ERR_PROCESS);break;}}OutError(RHCode,ArcName,ERR_READ);RARCloseArchive(hArcData);
}void ExtractArchive(char *ArcName, char* DstDir)
{HANDLE hArcData;int RHCode,PFCode;wchar_t CmtBuf[16384];struct RARHeaderData HeaderData;struct RAROpenArchiveDataEx OpenArchiveData;memset(&HeaderData,0,sizeof(HeaderData));memset(&OpenArchiveData,0,sizeof(OpenArchiveData));OpenArchiveData.ArcName=ArcName;OpenArchiveData.CmtBufW=CmtBuf;OpenArchiveData.CmtBufSize=sizeof(CmtBuf)/sizeof(CmtBuf[0]);OpenArchiveData.OpenMode=RAR_OM_EXTRACT;OpenArchiveData.Callback=CallbackProc;OpenArchiveData.UserData= EXTRACT;hArcData=RAROpenArchiveEx(&OpenArchiveData);if (OpenArchiveData.OpenResult!=0){OutError(OpenArchiveData.OpenResult,ArcName,ERR_OPEN);return;}ShowArcInfo(OpenArchiveData.Flags,ArcName);if (OpenArchiveData.CmtState==1)ShowComment(CmtBuf);while ((RHCode=RARReadHeader(hArcData,&HeaderData))==0){printf("\nExtracting %-45s",HeaderData.FileName);PFCode=RARProcessFile(hArcData,RAR_EXTRACT,DstDir,NULL);if (PFCode==0)printf(" OK");else{OutError(PFCode,ArcName,ERR_PROCESS);break;}}OutError(RHCode,ArcName,ERR_READ);RARCloseArchive(hArcData);
}size_t ListArchive(char *ArcName, std::vector<std::string>& vFiles)
{HANDLE hArcData;int RHCode,PFCode;wchar_t CmtBuf[16384];struct RARHeaderDataEx HeaderData;struct RAROpenArchiveDataEx OpenArchiveData;wchar_t RedirName[1024];memset(&HeaderData,0,sizeof(HeaderData));memset(&OpenArchiveData,0,sizeof(OpenArchiveData));OpenArchiveData.ArcName=ArcName;OpenArchiveData.CmtBufW=CmtBuf;OpenArchiveData.CmtBufSize=sizeof(CmtBuf)/sizeof(CmtBuf[0]);OpenArchiveData.OpenMode=RAR_OM_LIST;OpenArchiveData.Callback=CallbackProc;OpenArchiveData.UserData=LIST;hArcData=RAROpenArchiveEx(&OpenArchiveData);if (OpenArchiveData.OpenResult!=0){OutError(OpenArchiveData.OpenResult,ArcName,ERR_OPEN);return 0;}ShowArcInfo(OpenArchiveData.Flags,ArcName);if (OpenArchiveData.CmtState==1)ShowComment(CmtBuf);HeaderData.RedirName=RedirName;HeaderData.RedirNameSize=sizeof(RedirName)/sizeof(RedirName[0]);while ((RHCode=RARReadHeaderEx(hArcData,&HeaderData))==0){__int64 UnpSize=HeaderData.UnpSize+(((__int64)HeaderData.UnpSizeHigh)<<32);__int64 PackSize=HeaderData.PackSize+(((__int64)HeaderData.PackSizeHigh)<<32);printf("\nName:   %s",HeaderData.FileName);vFiles.push_back(HeaderData.FileName);printf("\nSize:   %lld ",UnpSize);printf("\nPacked: %lld ",PackSize);PrintTime("mtime",HeaderData.MtimeLow,HeaderData.MtimeHigh);PrintTime("ctime",HeaderData.CtimeLow,HeaderData.CtimeHigh);PrintTime("atime",HeaderData.AtimeLow,HeaderData.AtimeHigh);if (HeaderData.RedirType!=0)printf("\n\tlink type %d, target %ls",HeaderData.RedirType,HeaderData.RedirName);if ((PFCode=RARProcessFile(hArcData,RAR_SKIP,NULL,NULL))!=0){OutError(PFCode,ArcName,ERR_PROCESS);break;}printf("\n");}OutError(RHCode,ArcName,ERR_READ);RARCloseArchive(hArcData);return vFiles.size();
}void ListArchive(char *ArcName)
{HANDLE hArcData;int RHCode,PFCode;wchar_t CmtBuf[16384];struct RARHeaderDataEx HeaderData;struct RAROpenArchiveDataEx OpenArchiveData;wchar_t RedirName[1024];memset(&HeaderData,0,sizeof(HeaderData));memset(&OpenArchiveData,0,sizeof(OpenArchiveData));OpenArchiveData.ArcName=ArcName;OpenArchiveData.CmtBufW=CmtBuf;OpenArchiveData.CmtBufSize=sizeof(CmtBuf)/sizeof(CmtBuf[0]);OpenArchiveData.OpenMode=RAR_OM_LIST;OpenArchiveData.Callback=CallbackProc;OpenArchiveData.UserData=LIST;hArcData=RAROpenArchiveEx(&OpenArchiveData);if (OpenArchiveData.OpenResult!=0){OutError(OpenArchiveData.OpenResult,ArcName,ERR_OPEN);return;}ShowArcInfo(OpenArchiveData.Flags,ArcName);if (OpenArchiveData.CmtState==1)ShowComment(CmtBuf);HeaderData.RedirName=RedirName;HeaderData.RedirNameSize=sizeof(RedirName)/sizeof(RedirName[0]);while ((RHCode=RARReadHeaderEx(hArcData,&HeaderData))==0){__int64 UnpSize=HeaderData.UnpSize+(((__int64)HeaderData.UnpSizeHigh)<<32);__int64 PackSize=HeaderData.PackSize+(((__int64)HeaderData.PackSizeHigh)<<32);printf("\nName:   %s",HeaderData.FileName);printf("\nSize:   %lld ",UnpSize);printf("\nPacked: %lld ",PackSize);PrintTime("mtime",HeaderData.MtimeLow,HeaderData.MtimeHigh);PrintTime("ctime",HeaderData.CtimeLow,HeaderData.CtimeHigh);PrintTime("atime",HeaderData.AtimeLow,HeaderData.AtimeHigh);if (HeaderData.RedirType!=0)printf("\n\tlink type %d, target %ls",HeaderData.RedirType,HeaderData.RedirName);if ((PFCode=RARProcessFile(hArcData,RAR_SKIP,NULL,NULL))!=0){OutError(PFCode,ArcName,ERR_PROCESS);break;}printf("\n");}OutError(RHCode,ArcName,ERR_READ);RARCloseArchive(hArcData);
}void ShowComment(wchar_t *CmtBuf)
{printf("\nComment:\n%ls\n",CmtBuf);
}void OutHelp(void)
{printf("\nUNRDLL.   This is a simple example of UNRAR.DLL usage\n");printf("\nSyntax:\n");printf("\nUNRDLL X <Archive>     extract archive contents");printf("\nUNRDLL T <Archive>     test archive contents");printf("\nUNRDLL P <Archive>     print archive contents to stdout");printf("\nUNRDLL L <Archive>     view archive contents\n");
}void OutError(int Error,char *ArcName,int ErrType)
{switch(Error){case ERAR_NO_MEMORY:printf("\nNot enough memory");break;case ERAR_BAD_DATA:printf("\n%s: archive header or data are damaged",ArcName);break;case ERAR_BAD_ARCHIVE:printf("\n%s is not RAR archive",ArcName);break;case ERAR_UNKNOWN_FORMAT:printf("Unknown archive format");break;case ERAR_EOPEN:if (ErrType==ERR_PROCESS) // Returned by RARProcessFile.printf("Volume open error");elseprintf("\nCannot open %s",ArcName);break;case ERAR_ECREATE:printf("File create error");break;case ERAR_ECLOSE:printf("File close error");break;case ERAR_EREAD:printf("Read error");break;case ERAR_EWRITE:printf("Write error");break;case ERAR_SMALL_BUF:printf("Buffer for archive comment is too small, comment truncated");break;case ERAR_UNKNOWN:printf("Unknown error");break;case ERAR_MISSING_PASSWORD:printf("Password for encrypted file or header is not specified");break;case ERAR_EREFERENCE:printf("Cannot open file source for reference record");break;case ERAR_BAD_PASSWORD:printf("Wrong password is specified");break;}
}void ShowArcInfo(unsigned int Flags,char *ArcName)
{printf("\nArchive %s\n",ArcName);printf("\nVolume:\t\t%s",(Flags & 1) ? "yes":"no");printf("\nComment:\t%s",(Flags & 2) ? "yes":"no");printf("\nLocked:\t\t%s",(Flags & 4) ? "yes":"no");printf("\nSolid:\t\t%s",(Flags & 8) ? "yes":"no");printf("\nNew naming:\t%s",(Flags & 16) ? "yes":"no");printf("\nRecovery:\t%s",(Flags & 64) ? "yes":"no");printf("\nEncr.headers:\t%s",(Flags & 128) ? "yes":"no");printf("\nFirst volume:\t%s",(Flags & 256) ? "yes":"no or older than 3.0");printf("\n---------------------------\n");
}void PrintTime(const char *Label,unsigned int Low,unsigned int High)
{if (Low!=0 || High!=0){FILETIME ft;ft.dwLowDateTime=Low;ft.dwHighDateTime=High;SYSTEMTIME ust,st;FileTimeToSystemTime(&ft,&ust);SystemTimeToTzSpecificLocalTime(NULL,&ust,&st);printf("\n%s:  %u-%02u-%02u %02u:%02u:%02u,%03u",Label,st.wYear,st.wMonth,st.wDay,st.wHour,st.wMinute,st.wSecond,st.wMilliseconds);}
}int CALLBACK CallbackProc(UINT msg,LPARAM UserData,LPARAM P1,LPARAM P2)
{switch(msg){case UCM_CHANGEVOLUMEW:if (P2==RAR_VOL_ASK){printf("\n\nVolume %S is required\nPossible options:\n",(wchar_t *)P1);printf("\nEnter - try again");printf("\n'R'   - specify a new volume name");printf("\n'Q'   - quit");printf("\nEnter your choice: ");switch(toupper(getchar())){case 'Q':return(-1);case 'R':{wchar_t *eol;printf("\nEnter new name: ");fflush(stdin);// fgetws may fail to read non-English characters from stdin// in some compilers. In this case use something more// appropriate for Unicode input.fgetws((wchar_t *)P1,MAX_PATH,stdin);eol=wcspbrk((wchar_t *)P1,L"\r\n");if (eol!=NULL)*eol=0;}return(1);default:return(1);}}if (P2==RAR_VOL_NOTIFY)printf("\n  ... volume %S\n",(wchar_t *)P1);return(1);case UCM_PROCESSDATA:if (UserData==PRINT){fflush(stdout);fwrite((char *)P1,1,P2,stdout);fflush(stdout);}return(1);case UCM_NEEDPASSWORDW:{wchar_t *eol;printf("\nPassword required: ");// fgetws may fail to read non-English characters from stdin// in some compilers. In this case use something more appropriate// for Unicode input.fgetws((wchar_t *)P1,(int)P2,stdin);eol=wcspbrk((wchar_t *)P1,L"\r\n");if (eol!=NULL)*eol=0;}return(1);}return(0);
}