Drukowanie przez WinAPI

#include <windows.h>

int main() {
    PRINTER_INFO_5 * pinfo;
    DWORD dwsize, dwcount;
    EnumPrinters( PRINTER_ENUM_DEFAULT, NULL, 5, NULL, 0, & dwsize, & dwcount );
    pinfo =( PRINTER_INFO_5 * ) malloc( dwsize );
    EnumPrinters( PRINTER_ENUM_DEFAULT, NULL, 5,( PBYTE ) pinfo, dwsize, & dwsize, & dwcount );
    HDC hdc = CreateDC( NULL, NULL, pinfo->pPrinterName, NULL );
    DOCINFO di;
    di.cbSize = sizeof( DOCINFO );
    di.lpszDocName = "testdoc";
    di.lpszOutput = NULL;
    di.lpszDatatype = NULL;
    di.fwType = 0;
    if( StartDoc( hdc, & di ) <= 0 ) MessageBox( NULL, "nie mozna rozpoczac dokumentu", "wtf?", MB_ICONERROR );
   
    if( StartPage( hdc ) <= 0 ) MessageBox( NULL, "nie mozna rozpoczac strony", "wtf?", MB_ICONERROR );
   
    LPCSTR buf = "wtf?! wydrukowalo..";
    TextOut( hdc, 10, 10, buf, strlen( buf ) );
    if( EndPage( hdc ) <= 0 ) MessageBox( NULL, "nie mozna zakonczyc strony", "wtf?", MB_ICONERROR );
   
    if( EndDoc( hdc ) <= 0 ) MessageBox( NULL, "nie mozna zakonczyc dokumentu", "wtf?", MB_ICONERROR );
   
    DeleteDC( hdc );
    free( pinfo );
    return 0;
}