windowAPI一天一練之共享內(nèi)存

1、 今天學(xué)習(xí) win 下共享內(nèi)存的進(jìn)程通信，仿照 Qt 的共享內(nèi)存類，封裝了一個簡單的類。雖然比不上 Qt 的類那么完善和強(qiáng)大，但是通過學(xué)習(xí)也達(dá)到了理解 win 共享內(nèi)存的方式。 html view plaincopy 1. class WinSharedMemory 2. 3. public: 4. WinSharedMemory(string szkey = ); 5. WinSharedMemory(); 6. 7. bool CreateSize(int size); 8. void *Data(); 9. const void *ConstData() const; 10. bool

2、Attach(); 11. bool Detach(); 12. bool IsAttach(); 13. bool Lock(); 14. bool UnLock(); 15. int Size(); 16. void Setkey(string szKey); 17. string Key(); 18. string GetErrorMessage(); 19.protected: 20. void cleanHandle(); 21.private: 22. string m_errorMessage; 23. intm_size; 24. string m_memKey; 25. bo

3、olm_isLock; 26. HANDLE m_mutex; 27. HANDLE m_fileMapping; 28. void *m_pMemory; 29.; html view plaincopy 1. WinSharedMemory:WinSharedMemory( string szkey /*= */ ):m_mem Key(szkey) 2. ,m_isLock(false),m_mutex(NULL),m_pMemory(NULL),m_size(0),m_ fileMapping(NULL) 3. 4. 5. 6. WinSharedMemory:WinSharedMem

4、ory() 7. 8. this-Setkey(); 9. 10. 11.bool WinSharedMemory:CreateSize( int size ) 12. 13. if (m_memKey = ) 14. 15. m_errorMessage = 沒有設(shè)置共享內(nèi)存名 ; 16. return false; 17. 18. if (size setText(QString:fromStdString(pText); 37. 38. 39.void SharedMemory:WriteDataToMemorySlot() 40. 41. int size = 1024 * 1024

5、; 42. WinSharedMemory sharedMemory; 43. sharedMemory.Setkey(FileMapObject); 44. if (sharedMemory.IsAttach() 45. 46. sharedMemory.Detach(); 47. 48. sharedMemory.CreateSize(size); 49. sharedMemory.Attach(); 50. sharedMemory.Lock(); 51. char *pmemory = (char*)sharedMemory.Data(); 52. string text = m_pTextEdit-toPlainText().toStdString(); 53. strcpy(pmemory,text.c_str(); 54. sharedMemory.UnLock(); 55. 56. 57. 58.void SharedMemory:resizeEvent( QResizeEvent *event ) 59. 60. this-setFixedSize(QSize(500,300); 61. m_pReadDataBtn-setGeometry(0,0,100,20); 62. m_pReadDataBtn-setGeometr