FormulaCalculatorLib start page

FormulaCalculatorLib usage in C/C++

FormulaCalculatorLib.dll is a library with 5 exported functions:

Function name No.
FormulaCalculatorLib_SetFormula 1
FormulaCalculatorLib_Calculate 2
FormulaCalculatorLib_Reset 3
FormulaCalculatorLib_AddStatement 4
FormulaCalculatorLib_AddArgument 5

Description of functions see here: FormulaCalculatorLib function reference

You may call the functions from your C/C++ program in two ways:
1. Run-time dynamic linking:
- Load "FormulaCalculatorLib.dll" library using LoadLibrary Windows API function.
- Get function address by name or number using GetProcAddress Windows API function
- Call the function.

For example...
typedef BOOL  (__stdcall* funct_1)(char* formula);
typedef BOOL (__stdcall* funct_2)();
typedef BOOL (__stdcall* funct_3)(long* num);
typedef BOOL (__stdcall* funct_4)(long num,char* arg1,char* arg2,char* oper,char* funct,char* res);

typedef BOOL (__stdcall* funct_5)(double* double_res,char* arg_list);
typedef BOOL (__stdcall* funct_6)(char* arg1,char* arg2,char* oper,char* funct,char* res);
typedef BOOL (__stdcall* funct_7)(char* name,char* str_val);

funct_1 FC_SetFormula;
funct_5 FC_Calculate;
funct_2 FC_Reset;
funct_6 FC_AddStatement;
funct_7 FC_AddArgument;

HMODULE hFormulaParser;
HMODULE hFormulaCalculator;

//somewhere in creation
	if(!(hFormulaCalculator=LoadLibrary("FormulaCalculatorLib.dll")))
	{
		MessageBox("Cannot load FormulaCalculatorLib.dll","Error");
		return;
	}
	FC_SetFormula=(funct_1)GetProcAddress(hFormulaCalculator,"FormulaCalculatorLib_SetFormula");
	FC_Calculate=(funct_5)GetProcAddress(hFormulaCalculator,"FormulaCalculatorLib_Calculate");
	FC_Reset=(funct_2)GetProcAddress(hFormulaCalculator,"FormulaCalculatorLib_Reset");
	FC_AddStatement=(funct_6)GetProcAddress(hFormulaCalculator,"FormulaCalculatorLib_AddStatement");
	FC_AddArgument=(funct_7)GetProcAddress(hFormulaCalculator,"FormulaCalculatorLib_AddArgument");

//somewhere in destruction
	if(hFormulaCalculator)
		FreeLibrary(hFormulaCalculator);

//use the functions
	if(!FC_SetFormula(formula_str.GetBuffer(1000)))
	{
		MessageBox("Cannot set formula","Error");
		return false;
	}
	if(!FC_Calculate(&m_dResult,arg_str))
	{
		MessageBox("Cannot calculate formula",Error");
		return false;
	}

See VCTest_RunTime project source code

2. Load-time dynamicLinking:
- Add "FormulaCalculatorLib.lib" to the Link settings of your project. You must build the your project with the file.
- Include "FormulaCalculatorLib.h" header file in your implementation files where you are using functions from the library.

See VCTest_LoadTime project source code.

FormulaCalculatorLib usage in VisualBasic

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