- To start a new project, on the main menu, click File -> New…
- In the New dialog box, click the Projects property page
- In the list, click Win32 Static Library
- In the Project Name edit box, type MFCExt
- Click OK
- In the Win32 Static Library – Step 1 of 1, click both check boxes and click Finish then click OK
- To add a new header file, on the main menu, click File -> New…
- In the Files property page of the New dialog box, click C/C++ Header File. In the File Name edit box, type mfcextent and click OK
- In the empty file, type the following:
#ifndef MFCEXT_H_
#define MFCEXT_H_
namespace MFCExtensions
{
BOOL IsNatural(const CString Str);
BOOL IsNumeric(const CString Str);
int StringToInt(const CString Str);
double StringToFloat(const CString Str);
}
#endif // MFCEXT_H
|
- To add a new source file, on the main menu, click File -> New… In the Files property page of the New dialog box, click C++ Source File. In the File Name edit box, type mfcextent and click OK
- In the empty file, type the following:
#include "stdafx.h"
#include " mfcextent.h"
namespace MFCExtensions
{
BOOL IsNatural(const CString Str)
{
// Check each character of the string
// If a character at a certain position is not a digit,
// then the string is not a valid natural number
for(int i = 0; i < Str.GetLength(); i++)
{
if( Str[i] < '0' || Str[i] > '9' )
return FALSE;
}
return TRUE;
}
BOOL IsNumeric(const CString Str)
{
// Make a copy of the original string to test it
CString WithoutSeparator = Str;
// Prepare to test for a natural number
// First remove the decimal separator, if any
WithoutSeparator.Replace(".", "");
// If this number were natural, test it
// If it is not even a natural number, then it can't be valid
if( IsNatural(WithoutSeparator) == FALSE )
return FALSE; // Return Invalid Number
// Set a counter to 0 to counter the number of decimal separators
int NumberOfSeparators = 0;
// Check each charcter in the original string
for(int i = 0; i < Str.GetLength(); i++)
{
// If you find a decimal separator, count it
if( Str[i] == '.' )
NumberOfSeparators++;
}
// After checking the string and counting the decimal separators
// If there is more than one decimal separator,
// then this cannot be a valid number
if( NumberOfSeparators > 1 )
return FALSE; // Return Invalid Number
else // Otherwise, this appears to be a valid decimal number
return TRUE;
}
int StringToInt(const CString Str)
{
// First check to see if this is a valid natural number
BOOL IsValid = IsNatural(Str);
// If this number is valid, then convert it
if( IsValid == TRUE )
return atoi(Str);
else
{
// Return 0 to be nice
return 0;
}
}
double StringToFloat(const CString Str)
{
// First check to see if this is a valid number
BOOL IsValid = IsNumeric(Str);
// If this number is valid, then convert it
if( IsValid == TRUE )
return atof(Str);
else
{
// Return 0 to be nice
return 0;
}
}
}
|
- To create the library, on the main menu, click Build -> Build MFCExt.lib
The Output window will indicate that a file with .lib extension was created
|
