Purpose: export query results to Excel using COM.
* SQL INSERT INSERT INTO customers (cust_id, company, created_at) ; VALUES ("C43210", "Nexus Logistics", DATE()) * SQL SELECT (Fetches data into a local memory cursor) SELECT * FROM customers ; WHERE created_at >= ^2026-01-01 ; ORDER BY company ; INTO CURSOR curRecentCust * SQL UPDATE UPDATE customers ; SET company = "Nexus Logistics Corp" ; WHERE cust_id = "C43210" * SQL DELETE DELETE FROM customers ; WHERE cust_id = "C43210" Use code with caution. Object-Oriented Programming (OOP) in VFP
Visual FoxPro provides various commands for working with data, including SELECT, INSERT, UPDATE, and DELETE.
* Instantiate the custom class LOCAL loInvoice, lnFinalTotal loInvoice = CREATEOBJECT("InvoiceCalculator") * Set properties and run methods loInvoice.nSubTotal = 250.00 loInvoice.nTaxRate = 0.0825 && 8.25% Tax lnFinalTotal = loInvoice.CalculateTotal() * Display result MESSAGEBOX("The total invoice amount including tax is: $" + ; TRANSFORM(lnFinalTotal, "999,999.99"), 64, "Calculation Complete") * Define the Class Structure DEFINE CLASS InvoiceCalculator AS Custom * Properties nSubTotal = 0.00 nTaxRate = 0.00 PROTECTED nHiddenCalculatedTax nHiddenCalculatedTax = 0.00 * Methods PROCEDURE CalculateTotal() THIS.nHiddenCalculatedTax = THIS.nSubTotal * THIS.nTaxRate RETURN THIS.nSubTotal + THIS.nHiddenCalculatedTax ENDPROC PROCEDURE Init * Constructor code executes when object is created THIS.nSubTotal = 0.00 THIS.nTaxRate = 0.05 && Default tax rate ENDPROC ENDDEFINE Use code with caution. 4. Direct Windows API Interoperability visual foxpro programming examples pdf
*-- Instantiate and test the custom class LOCAL loValidator, lcEmail, llIsValid loValidator = CREATEOBJECT("DataValidator") lcEmail = "user@domain.com" llIsValid = loValidator.ValidateEmail(lcEmail) IF loValidator.ValidateRequired(lcEmail) AND llIsValid MESSAGEBOX("Email is valid and populated.", 64, "Success") ELSE MESSAGEBOX(loValidator.cErrorMessage, 48, "Validation Error") ENDIF RETURN *-- Class Definition DEFINE CLASS DataValidator AS Custom cErrorMessage = "" FUNCTION ValidateRequired(txValue) IF EMPTY(txValue) THIS.cErrorMessage = "Field cannot be empty." RETURN .F. ENDIF RETURN .T. ENDFUNC FUNCTION ValidateEmail(tcEmail) *-- Simple pattern check using AT() and OCCURS() IF OCCURS("@", tcEmail) != 1 OR OCCURS(".", tcEmail) < 1 THIS.cErrorMessage = "Invalid email format." RETURN .F. ENDIF RETURN .T. ENDFUNC ENDDEFINE Use code with caution. 3. String and File Handling
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VFP excels at string manipulation and low-level file operations, making it an excellent tool for processing flat files, CSVs, and logs. Reading and Processing a Text File Line-by-Line Purpose: export query results to Excel using COM
To get the most out of these resources, try these strategies:
* Loops example CLEAR DECLARE m.i AS Integer
Visual FoxPro blends procedural programming with Object-Oriented Programming (OOP). It uses a local database engine to execute lightning-fast data operations. Understanding the Command Window * Instantiate the custom class LOCAL loInvoice, lnFinalTotal
Developers prefer PDFs for VFP programming because the language is highly technical and visual. A PDF preserves the formatting of and form screenshots , making it easier to follow along than plain text files or outdated forum posts.
At its heart, Visual FoxPro excels at handling data natively without the heavy overhead of external database drivers. Creating a Table and Inserting Records
* Data retrieval example CLEAR SELECT * FROM customers
: In modern Windows environments, you can use the built-in Microsoft Print to PDF driver via the standard VFP print dialog.
