labwindowscvi5第六章 数据格式化、文件读取和IO端口操作

6. 路径应用(Directory Utilities)
• GetDir
int GetDir (char Current_Directory[]); i = GetDir (dir);
• •
SetDir DeleteDir
int DeleteDir (char Directory_Name[]); i = DeleteDir ("d:\\test\\data");
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Number_of_Elements, FILE *Stream); num = fread (data, 4096, 1024, fp);
• Fmtwizard
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3. 定时/等待(Timer/Wait)
• • • Timer
double Timer (void)
Delay
void Delay (double Number_of_Seconds); Delay(3.0);
SyncWait
void SyncWait (double Begin_Time, double Interval); SyncWait(mark, interval);
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ANSI C－stdio.h fopen • FILE *fopen (const char File_Name[], const char Mode[]); • fp = fopen ("test.dat", "wb+"); fclose • int fclose (FILE *Stream); • i = fclose (fp); fread • size_t fread (void *Buffer, size_t Element_Size, size_t
String_#1_Index, char String_#2[], int String_#2_Index, int Case_Sensitive?); • i = CompareStrings (str1, ind1, str2, ind2, 0);
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CopyString ……
•
Scan 将一个源数据（item）格式化到一个或多个 目标数据变量中
int Scan (void *Source, char Format_String[], ...); Scan ("10", "%s>%d", &i);
•
格式符
%s %d, %i %f %10f 字符串 整型 浮点型 浮点型数组
•
MakeDir
int MakeDir (char Directory_Name[]); i = MakeDir ("d:\\test\\data");
•
GetProjectDir
int GetProjectDir (char Directory_Name[]); i = GetProjectDir (dir);
自动化测试与控制研究所
1. 字符串操作
• Formatting and I/O－String Manipulation
StringLength • int StringLength (char String[]); • i = StringLength (str); StringLowerCase • void StringLowerCase (char String[]); • StringLowerCase (str); StringUpperCase CompareString • int CompareStrings (char String_#1[], int
LabWindows/CVI教程 LabWindows/CVI教程(5) 教程(5)
文件和端口操作
主讲：乔立岩 主讲：
Email: qiaoliyan@ (交作业） (交作业 交作业） MSN: qiaoliyan@（在线交流） qiaoliyan@（在线交流） Tel: 86413532 ext. 8611 （逸夫楼611） 逸夫楼611）
• CopyFile • int CopyFile (char Source_File_Name[], char • GetFileAttrs • int GetFileAttrs (char File_Name[], int *Read-Only, •
2010-112010-11-4 int *System, int *Hidden, int *Archive); i = GetFileAttrs ("test.dat", &read, &system, &hidden, &archive); 7/11 Target_File_Name[]); i = CopyFile (“test1.dat”, “test2.dat”);
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7. IO端口(Port IO)
• inp
char inp (short Port_Number); i = inp (0x220+4); j = inp (0x220+5); k = j*256+i;
• • •
inpw
k = inpw (0x220+4);
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• 修饰符
修饰符：[wn], [tn], [t#], [pn], [bn]… …
• 举例
int iData[100]; float fData[100]; Fmt(iData, ”%100d<%100f”, fData); Fmt(string,"%s<%s%f[p2]","value is ",value); Scan(string,"%s>%s[t#]%f",str1,&value);
New_File_Name[]); i = RenameFile ("test1.dat", "test2.dat");
•
Formatting and I/O－File I/O
OpenFile • int OpenFile (char File_Name[], int Read/Write_Mode, int Action, int File_Type) • fp = OpenFile ("test.dat", VAL_READ_ONLY, VAL_OPEN_AS_IS, VAL_BINARY); CloseFile • int CloseFile (int File_Handle); ReadFile • int ReadFile (int File_Handle, char Buffer[], int Count); • ReadFile (fp, data, 8); WriteFile • int WriteFile (int File_Handle, char Buffer[], int Count); • WriteFile (fp, data, 8); ArrayToFile FileToArray
• fwrite • size_t fwrite (const void *Buffer, size_t Element_Size, • ftell • long ftell (FILE *Stream); • pos = ftell (fp); fseek • int fseek (FILE *Stream, long Offset, int Origin); • i = fseek (fp, 256, SEEK_SET);
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• Programmer’s Toolbox－String Handling
AppendString • int AppendString (char
**Pointer_To_String_To_Append_To, const char String_To_Append[], int Num_Characters_To_Append); • AppendString (str1, str2, -1);
inpd outp
char outp (short Port_Number, char Byte); i = outp (0x2c0+5, ch);
• •
outpw outpd
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5. 文件应用
• Utilities－File Utilities
DeleteFilName[]); • i = DeleteFile ("*.doc"); RenameFile • int RenameFile (char Existing_File_Name[], char
4. 日期/时间(Date/Time)
• • • DateStr
char *DateStr (void); 格式：MM-DD-YYYY 格式：HH:MM:SS
TimeStr
char *TimeStr (void);
GetSystemTime
int GetSystemTime (int *Hours, int *Minutes, int *Seconds);
StrDup • char *StrDup (const char String_To_Duplicate[]); • str = StrDup ("virtual instrumentation lesson"); RemoveSurroundingWhiteSpace • void RemoveSurroundingWhiteSpace (char String[]); • RemoveSurroundingWhiteSpace (str); SkipWhiteSpace StrICmpWithoutSurrWhiteSpace ……