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CPI_Stream_LocalFile.c
Package: Visual C++视频音频开发实用工程案例精选.rar　[view]
Upload User: tuheem
Upload Date: 2007-05-01
Package Size: 21889k
Code Size: 3k
Category:

Multimedia Develop

Development Platform:

Visual C++

CPI_Stream_LocalFile.c：Code Content
  4. #include "stdafx.h"
  5. #include "globals.h"
  6. #include "CPI_Stream.h"
  8. typedef struct _CPs_InStream_File
  9. {
  10.     HANDLE m_hFile;
  12. } CPs_InStream_File;
  13. //
  15. void CPSLOCAL_Uninitialise(CPs_InStream* pStream);
  16. BOOL CPSLOCAL_Read(CPs_InStream* pStream, void* pDestBuffer, const unsigned int iBytesToRead, unsigned int* piBytesRead);
  17. void CPSLOCAL_Seek(CPs_InStream* pStream, const unsigned int iNewOffset);
  18. unsigned int CPSLOCAL_GetLength(CPs_InStream* pStream);
  19. BOOL CPSLOCAL_IsSeekable(CPs_InStream* pStream);
  20. unsigned int CPSLOCAL_Tell(CPs_InStream* pStream);
  22. CPs_InStream* CP_CreateInStream_LocalFile(const char* pcFlexiURL, HWND hWndOwner)
  23. {
  24.     HANDLE hFile;
  26.     hFile = CreateFile(pcFlexiURL, GENERIC_READ,
  27.                        FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
  28.                        OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
  30.     if(hFile == INVALID_HANDLE_VALUE)
  31.         return NULL;
  33.     {
  34.         CPs_InStream* pNewStream = (CPs_InStream*)malloc(sizeof(CPs_InStream));
  35.         CPs_InStream_File* pContext = (CPs_InStream_File*)malloc(sizeof(CPs_InStream_File));
  37.         pNewStream->Uninitialise = CPSLOCAL_Uninitialise;
  38.         pNewStream->Read = CPSLOCAL_Read;
  39.         pNewStream->Seek = CPSLOCAL_Seek;
  40. pNewStream->Tell = CPSLOCAL_Tell;
  41.         pNewStream->GetLength = CPSLOCAL_GetLength;
  42.         pNewStream->IsSeekable = CPSLOCAL_IsSeekable;
  43.         pNewStream->m_pModuleCookie = pContext;
  45.         pContext->m_hFile = hFile;
  47.         return pNewStream;
  48.     }
  49. }
  50. //
  52. void CPSLOCAL_Uninitialise(CPs_InStream* pStream)
  53. {
  54.     CPs_InStream_File* pContext = (CPs_InStream_File*)pStream->m_pModuleCookie;
  55.     CP_CHECKOBJECT(pContext);
  57.     CloseHandle(pContext->m_hFile);
  58.     free(pContext);
  59.     free(pStream);
  60. }
  61. //
  63. BOOL CPSLOCAL_Read(CPs_InStream* pStream, void* pDestBuffer, const unsigned int iBytesToRead, unsigned int* piBytesRead)
  64. {
  65.     CPs_InStream_File* pContext = (CPs_InStream_File*)pStream->m_pModuleCookie;
  66.     CP_CHECKOBJECT(pContext);
  68.     return ReadFile(pContext->m_hFile, pDestBuffer, iBytesToRead, piBytesRead, 0);
  69. }
  70. //
  71. void CPSLOCAL_Seek(CPs_InStream* pStream, const unsigned int iNewOffset)
  72. {
  73.     CPs_InStream_File* pContext = (CPs_InStream_File*)pStream->m_pModuleCookie;
  74.     CP_CHECKOBJECT(pContext);
  76.     SetFilePointer(pContext->m_hFile, iNewOffset, 0, FILE_BEGIN);
  77. }
  78. //
  79. unsigned int CPSLOCAL_GetLength(CPs_InStream* pStream)
  80. {
  81.     CPs_InStream_File* pContext = (CPs_InStream_File*)pStream->m_pModuleCookie;
  82.     CP_CHECKOBJECT(pContext);
  84.     return GetFileSize(pContext->m_hFile, NULL);
  85. }
  86. //
  87. BOOL CPSLOCAL_IsSeekable(CPs_InStream* pStream)
  88. {
  89.     return TRUE;
  90. }
  91. //
  92. #define GetFilePointer(hFile) SetFilePointer(hFile, 0, NULL, FILE_CURRENT)
  94. unsigned int CPSLOCAL_Tell(CPs_InStream* pStream)
  95. {
  96.     CPs_InStream_File* pContext = (CPs_InStream_File*)pStream->m_pModuleCookie;
  97.     CP_CHECKOBJECT(pContext);
  99.     return GetFilePointer(pContext->m_hFile);
  100. }