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#include <windows.h>
#include <stdio.h>
TCHAR* envVarStrings[] =
{
"OS = %OS%",
"PATH = %PATH%",
"HOMEPATH = %HOMEPATH%",
"TEMP = %TEMP%"
};
#define ENV_VAR_STRING_COUNT (sizeof(envVarStrings)/sizeof(TCHAR*))
#define INFO_BUFFER_SIZE 32767
void printError( TCHAR* msg );
void main( )
{
DWORD i;
TCHAR infoBuf[INFO_BUFFER_SIZE];
DWORD bufCharCount = INFO_BUFFER_SIZE;
// Get and display the name of the computer.
bufCharCount = INFO_BUFFER_SIZE;
if( !GetComputerName( infoBuf, &bufCharCount ) )
printError( "GetComputerName" );
printf( "\nComputer name: %s", infoBuf );
// Get and display the user name.
bufCharCount = INFO_BUFFER_SIZE;
if( !GetUserName( infoBuf, &bufCharCount ) )
printError( "GetUserName" );
printf( "\nUser name: %s", infoBuf );
// Get and display the system directory.
if( !GetSystemDirectory( infoBuf, INFO_BUFFER_SIZE ) )
printError( "GetSystemDirectory" );
printf( "\nSystem Directory: %s", infoBuf );
// Get and display the Windows directory.
if( !GetWindowsDirectory( infoBuf, INFO_BUFFER_SIZE ) )
printError( "GetWindowsDirectory" );
printf( "\nWindows Directory: %s", infoBuf );
// Expand and display a few environment variables.
printf( "\n\nSmall selection of Environment Variables:" );
for( i = 0; i < ENV_VAR_STRING_COUNT; ++i )
{
bufCharCount = ExpandEnvironmentStrings( envVarStrings[i], infoBuf, INFO_BUFFER_SIZE );
if( bufCharCount > INFO_BUFFER_SIZE )
printf( "\n (Warning: buffer too small to expand: \"%s\")", envVarStrings[i] );
else if( !bufCharCount )
printError( "ExpandEnvironmentStrings" );
else
printf( "\n %s", infoBuf );
}
}
void printError( TCHAR* msg )
{
DWORD eNum;
TCHAR sysMsg[256];
TCHAR* p;
eNum = GetLastError( );
FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, eNum,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
sysMsg, 256, NULL );
// Trim the end of the line and terminate it with a null
p = sysMsg;
while( ( *p > 31 ) || ( *p == 9 ) )
++p;
do { *p-- = 0; } while( ( p >= sysMsg ) &&
( ( *p == '.' ) || ( *p < 33 ) ) );
// Display the message
printf( "\n WARNING: %s failed with error %d (%s)", msg, eNum, sysMsg );
}
