某进程间共享总结专用类——CIPC class

class CIPC { public: CIPC(); virtual ~CIPC(); bool CreateIPCMMF(void); bool OpenIPCMMF(void); void CloseIPCMMF(void); bool IsOpen(void) const {return (m_hFileMap != NULL);} bool ReadIPCMMF(LPBYTE pBuf, DWORD &dwBufSize); bool WriteIPCMMF(const LPBYTE pBuf, const DWORD dwBufSize); bool Lock(void); void Unlock(void); protected: HANDLE m_hFileMap; HANDLE m_hMutex; };

#include #include #include #include "IPC.h" const static LPCTSTR g_szIPCSharedMMF = _T("{34F673E0-878F-11D5-B98A-00B0D07B8C7C}"); const static LPCTSTR g_szIPCMutex = _T("{34F673E1-878F-11D5-B98A-00B0D07B8C7C}"); //*********************************************** CIPC::CIPC() : m_hFileMap(NULL), m_hMutex(NULL) { } //*********************************************** CIPC::~CIPC() { CloseIPCMMF(); Unlock(); } //*********************************************** bool CIPC::CreateIPCMMF(void) { bool bCreated = false; try { if(m_hFileMap != NULL) return false; // Already created // Create an in-memory 4KB memory mapped file to share data m_hFileMap = CreateFileMapping((HANDLE)0xFFFFFFFF, NULL, PAGE_READWRITE, 0, 4096, g_szIPCSharedMMF); if(m_hFileMap != NULL) bCreated = true; } catch(...) {} return bCreated; } //*********************************************** bool CIPC::OpenIPCMMF(void) { bool bOpened = false; try { if(m_hFileMap != NULL) return true; // Already opened m_hFileMap = OpenFileMapping(FILE_MAP_READ | FILE_MAP_WRITE, FALSE, g_szIPCSharedMMF); if(m_hFileMap != NULL) bOpened = true; } catch(...) {} return bOpened; } //*********************************************** void CIPC::CloseIPCMMF(void) { try { if(m_hFileMap != NULL) CloseHandle(m_hFileMap), m_hFileMap = NULL; } catch(...) {} } //*********************************************** bool CIPC::ReadIPCMMF(LPBYTE pBuf, DWORD &dwBufSize) { _ASSERTE(pBuf); bool bSuccess = true; try { if(m_hFileMap == NULL) return false; DWORD dwBaseMMF = (DWORD)MapViewOfFile(m_hFileMap, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0); _ASSERTE(dwBaseMMF); // The first DWORD in the MMF contains the size of the data DWORD dwSizeofInBuf = dwBufSize; CopyMemory(&dwBufSize, (LPVOID)dwBaseMMF, sizeof(DWORD)); if(dwSizeofInBuf != 0) { if(dwBufSize > dwSizeofInBuf) bSuccess = false; else CopyMemory(pBuf, (LPVOID)(dwBaseMMF + sizeof(DWORD)), dwBufSize); } UnmapViewOfFile((LPVOID)dwBaseMMF); } catch(...) {} return bSuccess; } //*********************************************** bool CIPC::WriteIPCMMF(const LPBYTE pBuf, const DWORD dwBufSize) { _ASSERTE(pBuf); bool bSuccess = true; try { if(m_hFileMap == NULL) return false; DWORD dwBaseMMF = (DWORD)MapViewOfFile(m_hFileMap, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0); _ASSERTE(dwBaseMMF); // The first DWORD in the MMF contains the size of the data CopyMemory((LPVOID)dwBaseMMF, &dwBufSize, sizeof(DWORD)); CopyMemory((LPVOID)(dwBaseMMF + sizeof(DWORD)), pBuf, dwBufSize); UnmapViewOfFile((LPVOID)dwBaseMMF); } catch(...) {} return bSuccess; } //*********************************************** bool CIPC::Lock(void) { bool bLocked = false; try { // First get the handle to the mutex m_hMutex = CreateMutex(NULL, FALSE, g_szIPCMutex); if(m_hMutex != NULL) { // Wait to get the lock on the mutex if(WaitForSingleObject(m_hMutex, INFINITE) == WAIT_OBJECT_0) bLocked = true; } } catch(...) {} return bLocked; } //*********************************************** void CIPC::Unlock(void) { try { if(m_hMutex != NULL) { ReleaseMutex(m_hMutex); CloseHandle(m_hMutex); m_hMutex = NULL; } } catch(...) {} }