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PathAddExtension

BOOL PathAddExtension(
    LPTSTR  pszPath,
    LPCTSTR pszExtension
    );

Adds a file extension to a string.

Returns TRUE if successful, or FALSE otherwise.

pszPath: Address of the string to which the file extension will be added.
pszExtension: Address of the string that contains the file extension.

If there is already a file extension present, no extension will be added. If the path is a null string, the result will be the file extension only.

Example:

#include <windows.h>
#include <iostream.h>
#include "Shlwapi.h"

void main( void )
{
     // String for path name without file extension.
     char buffer_1[] = "file";
     char *lpStr1;
     lpStr1 = buffer_1;

     // String for path name with file extension.
     char buffer_2[] = "file.doc";
     char *lpStr2;
     lpStr2 = buffer_2;

     // String for extension name.
     char F_Ext[] = ".txt";
     char *lpStr3;
     lpStr3 = F_Ext;

     // Null string as path. 
     char N_String[] = "\0";
     char *lpStr4;
     lpStr4 = N_String;

     // Path 1 without the file extension.
     cout << "The original path string 1 is  " << lpStr1 << endl;

     int ret_1 = PathAddExtension(lpStr1,lpStr3);
     cout << "The modified path string 1 is  " << lpStr1 << endl;

    // Path 2 with the file extension already there.
    cout << "The original path string 2 is  " << lpStr2 << endl;
    int ret_2 = PathAddExtension(lpStr2,lpStr3);
    cout << "The modified path string 2 is  " << lpStr2<< endl;

    // Path 3 null string as a path.
    int ret_3 = PathAddExtension(lpStr4,lpStr3);
    cout << "The return value is " << ret_3<< endl;
    cout << "The modified path on a null string is " << lpStr4<< endl;

    int ret_4 = PathAddExtension("sample","");
    cout << "The return value is " << ret_4<< endl;

    if(ret_4 != 1)
    {cout << "The PathAddExtension failed" << endl;}
    else {cout << "The PathAddExtension succeeded" << endl;}
}
OUTPUT:
-----------------------
The original path string 1 is  file
The modified path string 1 is  file.txt
The original path string 2 is  file.doc
The modified path string 2 is  file.doc
The return value is 1
The modified path on a null string is .txt
The return value is 1
The PathAddExtension succeeded