labwindowscvi实例.ppt

LabWindows CVI教程 5 文件和端口操作主讲 乔立岩Email qiaoliyan 交作业 MSN qiaoliyan 在线交流 Tel 86413532ext 8611 逸夫楼611 2020 3 26 字符串操作FormattingandI O StringManipulationStringLengthintStringLength charString i StringLength str StringLowerCasevoidStringLowerCase charString StringLowerCase str StringUpperCaseCompareStringintCompareStrings charString 1 intString 1 Index charString 2 intString 2 Index intCase Sensitive i CompareStrings str1 ind1 str2 ind2 0 CopyString 2020 3 26 Programmer sToolbox StringHandlingAppendStringintAppendString char Pointer To String To Append To constcharString To Append intNum Characters To Append AppendString str1 str2 1 StrDupchar StrDup constcharString To Duplicate str StrDup virtualinstrumentationlesson RemoveSurroundingWhiteSpacevoidRemoveSurroundingWhiteSpace charString RemoveSurroundingWhiteSpace str SkipWhiteSpaceStrICmpWithoutSurrWhiteSpace 2020 3 26 数据格式化 DataFormatting Fmt将一个或多个源数据 item 格式化到一个目标数据变量中intFmt void Target charFormat String Fmt str s d 格式符 s字符串 d i整型 f浮点型 10f浮点型数组 2020 3 26 修饰符修饰符 wn tn t pn bn 举例intiData 100 floatfData 100 Fmt iData 100d s t f str1 Fmtwizard 2020 3 26 定时 等待 Timer Wait TimerdoubleTimer void DelayvoidDelay doubleNumber of Seconds Delay 3 0 SyncWaitvoidSyncWait doubleBegin Time doubleInterval SyncWait mark interval 日期 时间 Date Time DateStrchar DateStr void 格式 MM DD YYYYTimeStrchar TimeStr void 格式 HH MM SSGetSystemTimeintGetSystemTime int Hours int Minutes int Seconds 2020 3 26 文件应用Utilities FileUtilitiesDeleteFileintDeleteFile charFile Name i DeleteFile doc RenameFileintRenameFile charExisting File Name charNew File Name i RenameFile test1 dat test2 dat CopyFileintCopyFile charSource File Name charTarget File Name i CopyFile test1 dat test2 dat GetFileAttrsintGetFileAttrs charFile Name int Read Only int System int Hidden int Archive i GetFileAttrs test dat 2020 3 26 FormattingandI O FileI OOpenFileintOpenFile charFile Name intRead Write Mode intAction intFile Type fp OpenFile test dat VAL READ ONLY VAL OPEN AS IS VAL BINARY CloseFileintCloseFile intFile Handle ReadFileintReadFile intFile Handle charBuffer intCount ReadFile fp data 8 WriteFileintWriteFile intFile Handle charBuffer intCount WriteFile fp data 8 ArrayToFileFileToArray 2020 3 26 ANSIC stdio hfopenFILE fopen constcharFile Name constcharMode fp fopen test dat wb fcloseintfclose FILE Stream i fclose fp freadsize tfread void Buffer size tElement Size size tNumber of Elements FILE Stream num fread data 4096 1024 fp fwritesize tfwrite constvoid Buffer size tElement Size size tNumber of Elements FILE Stream num fwrite data 4096 1024 fp ftelllongftell FILE Stream pos ftell fp fseekintfseek FILE Stream longOffset intOrigin i fseek fp 256 SEEK SET 2020 3 26 路径应用 DirectoryUtilities GetDirintGetDir charCurrent Directory i GetDir dir SetDirDeleteDirintDeleteDir charDirectory Name i DeleteDir d test data MakeDirintMakeDir charDirectory Name i MakeDir d test data GetProjectDirintGetProjectDir charDirectory Name i GetProjectDir dir 2020 3 26 IO端口 PortIO inp