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【C】纯API实现多个文件分割再合并

作者:Owen / 发布于2014/10/10/ 799


	#include <windows.h>
	#include <stdio.h>
	#include <string.h>
	#include <commdlg.h>

	int main(int argc, char* argv[])
	{
	 OPENFILENAME File;
	 static char filepath[MAX_PATH];
	 LPTSTR filename=filepath;
	 ZeroMemory(&File,sizeof(File));
	 File.lStructSize=sizeof(File);
	 File.Flags=OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_ALLOWMULTISELECT;
	 File.hwndOwner=NULL;
	 File.lpstrFilter="All Files (*.*)\\0*.*\\0";
	 File.nFilterIndex=1;
	 File.lpstrFile=filepath;
	 File.nMaxFile=sizeof(filepath);
	 if(GetOpenFileName(&File))
	 {
	 LPTSTR SavePath="D:";
	 HANDLE rf=CreateFile(filename,GENERIC_READ,FILE_SHARE_READ,0,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
	 if(rf!=INVALID_HANDLE_VALUE)
	 {
	 DWORD FileLength=GetFileSize(rf,NULL);
	 DWORD PartLength=FileLength/3+FileLength%3;
	 int nCount=(FileLength+(FileLength%PartLength==0?0:PartLength-FileLength%PartLength))/PartLength;
	 char* pBuf=new char[PartLength];
	 int len=strlen(filename);
	 for(int c=len;c>0;c--)
	 if(filename[c]=='\\\\')
	 break;
	 filename+=c+1;
	 for(int i=1;i<=nCount;i++)
	 {
	 char temppath[MAX_PATH];
	 char tempnum[2];
	 DWORD ByteCount=(i<nCount?ByteCount+PartLength:FileLength-PartLength);
	 ReadFile(rf,pBuf,PartLength,&ByteCount,0);
	 strcpy(temppath,SavePath);
	 strcat(temppath,"\\\\");
	 strcat(temppath,filename);
	 wsprintf(tempnum,"%d",i);
	 strcat(temppath,tempnum);
	 HANDLE wf=CreateFile(temppath,GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
	 DWORD BackBytes=i<nCount?PartLength:FileLength-ByteCount;
	 WriteFile(wf,pBuf,ByteCount,&BackBytes,0);
	 FlushFileBuffers(wf);
	 CloseHandle(wf);
	 }
	 CloseHandle(rf);
	 delete pBuf;
	 }
	 LPTSTR savepath=SavePath;
	 char tempfilepath[MAX_PATH];
	 strcpy(tempfilepath,SavePath);
	 strcat(tempfilepath,"\\\\");
	 strcat(tempfilepath,filename);
	 strcpy(filename,tempfilepath);
	 HANDLE writefile=CreateFile(filename,GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
	 if(writefile!=INVALID_HANDLE_VALUE)
	 {
	 int filecount=1;
	 char numchar[2];
	 char temppath[MAX_PATH]={0};
	 strcpy(temppath,filename);
	 wsprintf(numchar,"%d",filecount++);
	 strcat(temppath,numchar);
	 while(GetFileAttributes(temppath)!=-1)
	 {
	 HANDLE readfile=CreateFile(temppath,GENERIC_READ,FILE_SHARE_READ,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
	 DWORD FileLength=GetFileSize(readfile,NULL);
	 DWORD BuffSize=FileLength<10485760L?FileLength:10485760L;
	 int nCount=(FileLength+(FileLength%BuffSize==0?0:BuffSize-FileLength%BuffSize))/BuffSize;
	 char* pBuf=new char[BuffSize];
	 for(int i=1;i<=nCount;i++)
	 {
	 DWORD ByteCount=(i<nCount?ByteCount+BuffSize:FileLength-BuffSize);
	 ReadFile(readfile,pBuf,BuffSize,&ByteCount,0);
	 DWORD BackBytes=i<nCount?BuffSize:FileLength-ByteCount;
	 WriteFile(writefile,pBuf,ByteCount,&BackBytes,0);
	 }
	 FlushFileBuffers(writefile);
	 CloseHandle(readfile);
	 delete pBuf;
	 strcpy(temppath,filename);
	 wsprintf(numchar,"%d",filecount++);
	 strcat(temppath,numchar);
	 }
	 CloseHandle(writefile);
	 }
	 }
	 return 0;
	}

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　文件分割　　文件合并　

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