labcvi文件和端口编程

LabWindows/CVI教程(5)文件和端口操作主讲：乔立岩Email:qiaoliyan@(交作业）

MSN:（在线交流）Tel:86413532ext.8611（逸夫楼611）12/30/2023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……12/30/2023Programmer’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……12/30/2023数据格式化(DataFormatting)Fmt将一种或多种源数据（item）格式化到一种目的数据变量中intFmt(void*Target,charFormat_String[],...);Fmt(str,"%s<%d%s%d",i,"plus",j);Scan将一种源数据（item）格式化到一种或多种目的数据变量中intScan(void*Source,charFormat_String[],...);Scan("10","%s>%d",&i);格式符%s 字符串%d,%i 整型%f 浮点型%10f 浮点型数组12/30/2023修饰符修饰符：[wn],[tn],[t#],[pn],[bn]……举例intiData[100];floatfData[100];Fmt(iData,”%100d<%100f”,fData);Fmt(string,"%s<%s%f[p2]","valueis",value);Scan(string,"%s>%s[t#]%f",str1,&value);Fmtwizard12/30/2023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);12/30/2023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",&read,&system,&hidden,&archive);12/30/2023FormattingandI/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);ArrayToFileFileToArray12/30/2023ANSIC－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);12/30/2023途径应用(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);……12/30/2023IO端口(PortIO)inpc