使用 Visual FoxPro 将具有其他字段类型的备注字段导出到文本文件

本文介绍如何将表中包含备注字段的记录以及其他字段类型动态导出到逗号分隔的文本文件中。

原始产品版本： Visual FoxPro
原始 KB 编号： 241424

摘要

本文演示如何将表中包含备注字段的记录以及其他字段类型动态导出到逗号分隔的文本文件中。

更多信息

本文中的示例代码遵循以下顺序：

1. 提示输入源表 (.dbf 文件) 。
2. 提示输入目标文本文件 (.txt 文件) 。
3. 将表的内容导出到文本文件。

代码扫描并确定表中的每个字段类型和每条记录，然后根据数据类型相应地处理它们：

CLOSE ALL
CLEAR ALL

lcFieldString = ''
lcMemo = ''

USE GETFILE('dbf', 'Select DBF') && Prompts for table to be used.

lnFieldCount = AFIELDS(laGetFields) && Builds array of fields from the
&& selected table.

*!* Prompt for Output file and use Low-Level functions
*!* to create it.
lcTextFile = FCREATE(GETFILE('txt', 'Select Text'))

*!* Starts scanning the table and converts the fields
*!* values according to their types **
SCAN
    WAIT WINDOW STR(RECNO()) + ' Of ' + STR(RECCOUNT()) NOWAIT

    FOR lnCount = 1 TO lnFieldCount
        lcType = laGetFields(lnCount, 2)

        IF lcType # 'G' && Don't try to turn a general field into a string
            lcString = EVALUATE(laGetFields(lnCount, 1))
        EndIf

        DO CASE
            CASE lcType = 'M' && Process the Memo Fields
                lnMemoLines = MEMLINES(EVALUATE(laGetFields(lnCount,1)))
                FOR lnLoop = 1 TO lnMemoLines
                    IF lnLoop < lnMemoLines
                        lcMemo = lcMemo + ;
                            ALLTRIM(MLINE(EVALUATE(laGetFields(lnCount, 1)), ;
                    lnLoop)) + ' '
                    ELSE
                        lcMemo = lcMemo + ;
                            ALLTRIM(MLINE(EVALUATE(laGetFields(lnCount, 1)), ;
                    lnLoop))
                    ENDif
                ENDfor

                lcString = lcMemo
                lcMemo = ''
            CASE lcType = 'G' && Process the General Fields
                lcString = 'Gen'
            CASE lcType = 'D' && Process the Date Fields
                lcString = DTOC(lcString)
            CASE lcType = 'T' && Process the DateTime Fields
                lcString = TTOC(lcString)
            CASE lcType = 'N' && Process the Numeric Fields
                lcString = STR(lcString, LEN(STR(lcString)), 2)
            CASE lcType = 'I' && Process the Integer Fields
                lcString = STR(lcString)
            CASE lcType = 'L' && Process the Logical Fields
                IF lcString = .T.
                    lcString = 'T'
                ELSE
                    lcString = 'F'
                ENDif
        ENDcase

        IF lnCount < lnFieldCount && Determines if the last field was
        && processed and sets the closing quote.
        lcFieldString = lcFieldString + '"' + lcString + '"' + ','
        ELSE
        lcFieldString = lcFieldString + '"' + lcString + '"'
        ENDif
    ENDfor

    FPUTS(lcTextFile, lcFieldString) && Writes string to the text file.
    lcFieldString = ''
ENDscan

FCLOSE(lcTextFile)

CLOSE All
CLEAR All
WAIT WINDOW 'Text File Creation Completed' NOWAIT