学步园

写入数据：

#include <iostream><br /> #include <windows.h><br /> using namespace std;</p> <p>typedef struct tagData<br /> {<br /> int n;<br /> float f;<br /> char c;<br /> }DATA,*PDATA;</p> <p>#define FILE_SIZE sizeof(DATA)<br /> #define FILE_MAPPING_NAME "FileMappingName"</p> <p>void main(int argc,TCHAR*argv[])<br /> {<br /> HANDLE hFile = CreateFile("D://text.txt",GENERIC_WRITE|GENERIC_READ,FILE_SHARE_READ|FILE_MAP_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);<br /> if(INVALID_HANDLE_VALUE == hFile)<br /> return;</p> <p> HANDLE hFileMapping = CreateFileMapping(hFile,NULL,PAGE_READWRITE,0,FILE_SIZE,FILE_MAPPING_NAME);<br /> if(NULL == hFileMapping)<br /> return;</p> <p> LPVOID lpMem = MapViewOfFile(hFileMapping,FILE_MAP_ALL_ACCESS,0,0,FILE_SIZE);<br /> if(NULL == lpMem)<br /> return;</p> <p> //2个的此处不同 写入<br /> memset(lpMem,0,FILE_SIZE);<br /> PDATA pData = (PDATA)lpMem;<br /> pData->n = 10;<br /> pData->f = 100.001;<br /> pData->c = 'g';<br /> //2个的此处不同 写入</p> <p> if(!UnmapViewOfFile(lpMem))<br /> return;</p> <p> CloseHandle(hFileMapping);<br /> CloseHandle(hFile);</p> <p> cout<<"succeed"<<endl;<br /> }

读取数据：

#include <iostream><br /> #include <windows.h><br /> using namespace std;</p> <p>typedef struct tagData<br /> {<br /> int n;<br /> float f;<br /> char c;<br /> }DATA,*PDATA;</p> <p>#define FILE_SIZE sizeof(DATA)<br /> #define FILE_MAPPING_NAME "FileMappingName"</p> <p>void main(int argc,TCHAR*argv[])<br /> {<br /> HANDLE hFile = CreateFile("D://text.txt",GENERIC_WRITE|GENERIC_READ,FILE_SHARE_READ|FILE_MAP_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);<br /> if(INVALID_HANDLE_VALUE == hFile)<br /> return;</p> <p> HANDLE hFileMapping = CreateFileMapping(hFile,NULL,PAGE_READWRITE,0,FILE_SIZE,FILE_MAPPING_NAME);<br /> if(NULL == hFileMapping)<br /> return;</p> <p> LPVOID lpMem = MapViewOfFile(hFileMapping,FILE_MAP_ALL_ACCESS,0,0,FILE_SIZE);<br /> if(NULL == lpMem)<br /> return;</p> <p> //2个的此处不同 读取<br /> PDATA pData = (PDATA)lpMem;<br /> cout<<pData->n<<endl;<br /> cout<<pData->f<<endl;<br /> cout<<pData->c<<endl;<br /> //2个的此处不同 读取</p> <p> if(!UnmapViewOfFile(lpMem))<br /> return;</p> <p> CloseHandle(hFileMapping);<br /> CloseHandle(hFile);</p> <p> cout<<"succeed"<<endl;<br /> }