tools : append file to file
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今天有下载到2个文件, xx.7z.001, xx.7z.002
我只装了WinRar, 网上有资料说 可以用 copy /B, 合并文件后, 变成xx.7z, 然后用WinRar打开.
试了一下， 小文件合并, 用Copy /B 是可以的。
如果是大文件（这两个文件是600MB和100MB）, Copy /B 失败
最初的想法是, 不安装7z解压程序， 直接写个小工具合并 .7z的分卷压缩文件到一个完整的7z文件, 然后用WinRar打开解压.
工具写好了, 运行 prjMergeFile.exe test.7z， 将xx.7z.000, ..., ... xx.7z.999之间的文件合并成一个xx.7z
D:\LsWorkDir\DebugTools\prjMergeFile\Release>prjMergeFile.exe test.7zusage : MergeFile file.postfixwill merge file file :.\file.postfix.001,.\file.postfix.002, .\file.postfix.XXX, to .\file.postfixif not need debug, press any key to continueargv[1] = [test.7z]strFileName = .\test.7z(llRdAll(670932347) == llWrAll(670932347)) is TRUEappend [.\test.7z.001] to [.\test.7z](llRdAll(130715875) == llWrAll(130715875)) is TRUEappend [.\test.7z.002] to [.\test.7z]mergeFile OKEND, press anykey to quit
手工算过size, 文件合并是正确的
xx.7z.001670,932,347xx.7z.002130,715,875xx.7z801,648,222
合并文件的工程文件
// prjMergeFile.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <windows.h>#include <tchar.h>#include <string>int mergeFile(const wchar_t * pcFileName);bool IsFileExist(const wchar_t * pcFileName);bool AppendSrcFileToDstFile(const wchar_t * pcFileDst, const wchar_t * pcFileSrc);bool AppendSrcFileToDstFile(HANDLE hFileDst, HANDLE hFileSrc);std::wstring StringFormatV(wchar_t * szFormat, ...);int _tmain(int argc, _TCHAR* argv[]){ int iRc = S_OK; _tprintf( L"usage : MergeFile file.postfix\r\n" L"will merge file file :\r\n" L".\\file.postfix.001,\r\n" L".\\file.postfix.002,\r\n " L".\\file.postfix.XXX,\r\n " L"to .\\file.postfix\r\n\r\n"); if (2 != argc) { _tprintf(L"2 != argc, please give parameter\r\n"); goto _tmain_END; } _tprintf(L"if not need debug, press any key to continue\r\n"); getwchar(); _tprintf(L"argv[1] = [%s]\r\n", argv[1]); iRc = mergeFile(argv[1]); _tprintf(L"mergeFile %s\r\n", (S_OK == iRc) ? L"OK" : L"FAILED");_tmain_END: _tprintf(L"\r\nEND, press anykey to quit\r\n"); getwchar();return 0;}int mergeFile(const wchar_t * pcFileName){ int iRc = S_OK; int iIndex = 0; std::wstring strFileName; std::wstring strFileNameCur; std::wstring::size_type nPos = std::wstring::npos; strFileName = pcFileName; nPos = strFileName.rfind(L'\\'); if (std::wstring::npos == nPos) { strFileName.insert(0, L".\\"); _tprintf(L"strFileName = %s\r\n", strFileName.c_str()); } if (IsFileExist(pcFileName)) { /// 防止损毁已经存在的用户文件 iRc = S_FALSE; _tprintf(L"please remove [%s] and try again\r\n", pcFileName); goto mergeFile_END; } for (iIndex = 0; iIndex <= 999; iIndex++) { strFileNameCur = StringFormatV(L"%s.%.3d", strFileName.c_str(), iIndex); if (!IsFileExist(strFileNameCur.c_str())) continue; if (!AppendSrcFileToDstFile( strFileName.c_str(), strFileNameCur.c_str())) { _tprintf(L"FAILED : AppendSrcFileToDstFile(%s, %s)\r\n", strFileName.c_str(), strFileNameCur.c_str()); iRc = S_FALSE; break; } else { _tprintf(L"append [%s] to [%s]\r\n", strFileNameCur.c_str(), strFileName.c_str()); } }mergeFile_END: return iRc;}bool IsFileExist(const wchar_t * pcFileName){ HANDLE hFile = INVALID_HANDLE_VALUE; hFile = ::CreateFile( pcFileName, // name of the write GENERIC_READ, // open for writing 0, // do not share NULL, // default security OPEN_EXISTING, // overwrite existing FILE_ATTRIBUTE_NORMAL, // normal file NULL); // no attr. template if (INVALID_HANDLE_VALUE == hFile) return false; ::CloseHandle(hFile); return true;}std::wstring StringFormatV(wchar_t * szFormat, ...){//入参为格式化的参数列表 size_t nStrLen = 0; wchar_t * pBufMsg = NULL; std::wstring strRc; va_list args; va_start(args, szFormat); nStrLen = _vsntprintf(NULL, 0, szFormat, args); pBufMsg = new wchar_t[nStrLen + 1]; _ASSERT(pBufMsg); ::ZeroMemory(pBufMsg, (nStrLen + 1) * sizeof(wchar_t)); nStrLen = _vsntprintf(pBufMsg, nStrLen, szFormat, args); va_end(args); strRc = pBufMsg; delete []pBufMsg; pBufMsg = NULL; return strRc;}bool AppendSrcFileToDstFile(const wchar_t * pcFileDst, const wchar_t * pcFileSrc){ bool bRc = false; HANDLE hFileDst = INVALID_HANDLE_VALUE; HANDLE hFileSrc = INVALID_HANDLE_VALUE; LARGE_INTEGER LISizeDst; LISizeDst.QuadPart = (LONGLONG)0; if (!IsFileExist(pcFileDst)) { hFileDst = ::CreateFile( pcFileDst, // name of the write GENERIC_WRITE, // open for writing 0, // do not share NULL, // default security CREATE_NEW, // overwrite existing FILE_ATTRIBUTE_NORMAL, // normal file NULL); // no attr. template if (INVALID_HANDLE_VALUE == hFileDst) return false; ::CloseHandle(hFileDst); hFileDst = INVALID_HANDLE_VALUE; } /// open dst file hFileDst = ::CreateFile( pcFileDst, // name of the write GENERIC_WRITE, // open for writing 0, // do not share NULL, // default security OPEN_EXISTING, // overwrite existing FILE_ATTRIBUTE_NORMAL, // normal file NULL); // no attr. template if (INVALID_HANDLE_VALUE == hFileDst) goto AppendSrcFileToDstFile_END; if (!GetFileSizeEx(hFileDst, &LISizeDst)) goto AppendSrcFileToDstFile_END; if (0 != LISizeDst.QuadPart) SetFilePointer (hFileDst, 0, NULL, FILE_END) ; /// open src file hFileSrc = ::CreateFile( pcFileSrc, // name of the write GENERIC_READ, // open for writing 0, // do not share NULL, // default security OPEN_EXISTING, // overwrite existing FILE_ATTRIBUTE_NORMAL, // normal file NULL); // no attr. template if (INVALID_HANDLE_VALUE == hFileSrc) goto AppendSrcFileToDstFile_END; /// read from src file, write to dst file if (AppendSrcFileToDstFile(hFileDst, hFileSrc)) bRc = true;AppendSrcFileToDstFile_END: if (INVALID_HANDLE_VALUE != hFileDst) ::CloseHandle(hFileDst); if (INVALID_HANDLE_VALUE != hFileSrc) ::CloseHandle(hFileSrc); return bRc;}bool AppendSrcFileToDstFile(HANDLE hFileDst, HANDLE hFileSrc){ LONGLONG llRdAll = 0; LONGLONG llWrAll = 0; bool bRc = false; DWORD dwRdBk = 0; DWORD dwWrBk = 0; BYTE cBufRdBk[4096]; do { if (FALSE == ::ReadFile(hFileSrc, cBufRdBk, sizeof(cBufRdBk), &dwRdBk, NULL)) { return false; } llRdAll += dwRdBk; if (0 == dwRdBk) break; if (FALSE == ::WriteFile(hFileDst, cBufRdBk, dwRdBk, &dwWrBk, NULL)) return false; llWrAll += dwWrBk; if (dwRdBk != dwWrBk) return false; } while (1); if (llRdAll > 0) { _tprintf(L"(llRdAll(%I64d) == llWrAll(%I64d)) is %s\r\n", llRdAll, llWrAll, (llRdAll == llWrAll) ? L"TRUE" : L"FALSE"); } return (llRdAll == llWrAll);}但是合并后的xx.7z, 用WinRar打不开 :(
我装个7z解压， 看看能否打开这个.7z文件.
从7Zip主页(http://sourceforge.net/projects/sevenzip/?source=dlp)上下载了一个X64版本.
7zip也打不开合并后的单个.7z文件, 我高度怀疑每个.7z.xx分卷压缩的文件头上有解压标记和分卷文件合并信息,
非第一个7z分卷压缩文件, 并不是单纯的为数据文件. 所以导致打不开.
作了实验, 装了7zip也打不开xx.7z.001文件. 初步判断此文件在下载过程中损坏或者下载点的xx.7z.00x就是坏的.
后续实验， 将一个很大的文件夹用7zip压缩成test.7z分卷文件, 每个分卷650MB, 加上口令
用7zip打开test.7z.002文件是失败的, 说明.7z.002文件中没有文件解压信息.
用7zip打开test.7z.001文件成功成功， 并且弹出口令框. 说明xx.7z.001文件确实是坏的. 晕倒啊~~
用此合并工具将test.7z.001和test.7z.002文件合并后, 用WinRar和7Zip均能打开.
说明本次合并工具是靠谱的~~
bool AppendSrcFileToDstFile(const wchar_t * pcFileDst, const wchar_t * pcFileSrc);
AppendSrcFileToDstFile函数可以留着给别的工程用，还算靠谱的一个函数～
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