自己实现的单片机里的dbf文件读写

#ifdef __cplusplus extern "C" { #endif #include "config.h" #ifdef __cplusplus }; #endif tag_DBF_WORKAREA_LIST g_Dbf_WorkArea_List; //DBF文件操作函数实现 uint8 DbfCreateFile(uint8 *pFileName,tag_DBF_FieldInfo *pFieldInfo,uint8 nCount) { time_t tm_t; struct tm *ptm; uint8 n; uint8 buf[]={DBF_HeadInfo_EOF,DBF_FILE_EOF}; tag_DBF_WORKAREA dbfWorkArea; memset(&dbfWorkArea,0,sizeof(tag_DBF_WORKAREA)); strcpy((char *)dbfWorkArea.m_sDbfFileName,(char *)pFileName); dbfWorkArea.m_DbfHeadInfo.m_FileType=0x03; tm_t=time(NULL); ptm=localtime(&tm_t); dbfWorkArea.m_DbfHeadInfo.m_LastModifyDate.m_year=ptm->tm_year; dbfWorkArea.m_DbfHeadInfo.m_LastModifyDate.m_month=ptm->tm_mon; dbfWorkArea.m_DbfHeadInfo.m_LastModifyDate.m_day=ptm->tm_mday; memcpy(dbfWorkArea.m_DbfFieldInfo,pFieldInfo,nCount*sizeof(tag_DBF_FieldInfo)); dbfWorkArea.m_DbfHeadInfo.m_FieldCount=nCount; dbfWorkArea.m_DbfHeadInfo.m_FirstRecordPos=sizeof(tag_DBF_HeadInfo)+nCount*sizeof(tag_DBF_FieldInfo)+1; dbfWorkArea.m_DbfHeadInfo.m_ByteSizePerRecord++; for(n=0;n<nCount;n++) { dbfWorkArea.m_DbfHeadInfo.m_ByteSizePerRecord+=pFieldInfo[n].m_FieldByteSize; } dbfWorkArea.m_pFileHandle=fopen((char *)pFileName,"wb+"); if(dbfWorkArea.m_pFileHandle==NULL) { return FALSE; } fseek(dbfWorkArea.m_pFileHandle,0,SEEK_SET); fwrite(&dbfWorkArea.m_DbfHeadInfo,sizeof(tag_DBF_HeadInfo),1,dbfWorkArea.m_pFileHandle); fwrite(pFieldInfo,nCount*sizeof(tag_DBF_FieldInfo),1,dbfWorkArea.m_pFileHandle); fwrite(buf,2,1,dbfWorkArea.m_pFileHandle); fclose(dbfWorkArea.m_pFileHandle); return TRUE; } uint8 DbfUse(uint8 *pFileName) { uint8 n,m; for(n=0;n<DBF_MAX_WORKAREA_COUNT;n++) { if(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle==NULL) { g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle=fopen((char *)pFileName,"r"); if(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle==NULL) { memset(&g_Dbf_WorkArea_List.m_WorkAreas[n],0,sizeof(tag_DBF_WORKAREA)); return 0xff; } fclose(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle); g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle=fopen((char *)pFileName,"rb+"); if(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle==NULL) { memset(&g_Dbf_WorkArea_List.m_WorkAreas[n],0,sizeof(tag_DBF_WORKAREA)); return 0xff; } // strcpy((char *)g_Dbf_WorkArea_List.m_WorkAreas[n].m_sDbfFileName,(char *)pFileName); // fseek(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle,0,SEEK_SET); // fread(&g_Dbf_WorkArea_List.m_WorkAreas[n].m_DbfHeadInfo,sizeof(tag_DBF_HeadInfo),1,g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle); if(g_Dbf_WorkArea_List.m_WorkAreas[n].m_DbfHeadInfo.m_FileType!=0x03) { fclose(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle); memset(&g_Dbf_WorkArea_List.m_WorkAreas[n],0,sizeof(tag_DBF_WORKAREA)); return 0xff; } g_Dbf_WorkArea_List.m_WorkAreas[n].m_DbfHeadInfo.m_FieldCount=(g_Dbf_WorkArea_List.m_WorkAreas[n].m_DbfHeadInfo.m_FirstRecordPos-sizeof(tag_DBF_HeadInfo)-1)/sizeof(tag_DBF_FieldInfo); // m=g_Dbf_WorkArea_List.m_WorkAreas[n].m_DbfHeadInfo.m_FieldCount; fread(g_Dbf_WorkArea_List.m_WorkAreas[n].m_DbfFieldInfo,sizeof(tag_DBF_FieldInfo),m,g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle); // fseek(g_Dbf_WorkArea_List.m_WorkAreas[n].m_pFileHandle,1,SEEK_CUR); // return n; } } return 0xff; } uint8 DbfUnUse(uint8 nWorkArea) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_pFileHandle!=NULL) { fclose(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_pFileHandle); memset(&g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea],0,sizeof(tag_DBF_WORKAREA)); } return TRUE; } tag_DBF_WORKAREA *DbfGetWorkAreaInfo(uint8 nWorkArea) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } return &g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea]; } tag_DBF_HeadInfo *DbfGetHeadInfo(uint8 nWorkArea) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } return &g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfHeadInfo; } tag_DBF_FieldInfo *DbfGetFieldInfo(uint8 nWorkArea) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfHeadInfo.m_FieldCount==0) { return FALSE; } return &g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfFieldInfo[g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex]; } uint8 DbfBof(uint8 nWorkArea) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurRecordIndex>0) { return FALSE; } return TRUE; } uint8 DbfEof(uint8 nWorkArea) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurRecordIndex<(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfHeadInfo.m_RecordCount-1)) { return FALSE; } return TRUE; } uint8 DbfReadField(uint8 nWorkArea,uint8 *pBuf,uint8 nlen) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(pBuf==NULL) { return FALSE; } if(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfFieldInfo[g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex].m_FieldByteSize>nlen) { return FALSE; } DbfSeek(nWorkArea, g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurRecordIndex, g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex); fread(pBuf,g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfFieldInfo[g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex].m_FieldByteSize,1,g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_pFileHandle); return TRUE; } uint8 DbfWriteField(uint8 nWorkArea,uint8 *pBuf,uint8 nlen) { if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(pBuf==NULL) { return FALSE; } if(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfFieldInfo[g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex].m_FieldByteSize<nlen) { return FALSE; } DbfSeek(nWorkArea, g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurRecordIndex, g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex); fwrite(pBuf,nlen,1,g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_pFileHandle); return TRUE; } uint8 DbfSeek(uint8 nWorkArea,uint32 nRecord,uint8 nField) { uint32 offset; uint8 n; if(nWorkArea>=DBF_MAX_WORKAREA_COUNT) { return FALSE; } if(nRecord>(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfHeadInfo.m_RecordCount-1)) { return FALSE; } if(nField>(g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_DbfHeadInfo.m_FieldCount-1)) { return FALSE; } g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurRecordIndex=nRecord; g_Dbf_WorkArea_List.m_WorkAreas[nWorkArea].m_nCurFieldIndex=nField; offset=g_Dbf_WorkArea_List.m_WorkAreas