Code:

#include <stdio.h>

int main() {
    FILE *printer;
    printer = fopen("/dev/lp0","wb");
    fprintf(printer,"nesto\f");
    fclose(printer);
    return 0;
}

Code:

HDC GetPrinterDC(void)
{
    DWORD dwNeeded, dwReturned;
    HDC hdc;
    PRINTER_INFO_4 * pinfo4;
    PRINTER_INFO_5 * pinfo5;

    if (GetVersion() & 0x80000000)        // Za Win98
    {
        EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 5, NULL, 0, 
                         &dwNeeded, &dwReturned);
        pinfo5 = malloc(dwNeeded);
        EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 5, (PBYTE) pinfo5,
                         dwNeeded, &dwNeeded, &dwReturned);

        hdc = CreateDC(NULL, pinfo5->pPrinterName, NULL, NULL);

        free(pinfo5);
    }
    else        // Za WinNT
    {
        EnumPrinters(PRINTER_ENUM_LOCAL, NULL, 4, NULL,
                         0, &dwNeeded, &dwReturned);
        pinfo4 = malloc(dwNeeded);
        EnumPrinters(PRINTER_ENUM_LOCAL, NULL, 4, (PBYTE) pinfo4,
                         dwNeeded, &dwNeeded, &dwReturned);

        hdc = CreateDC(NULL, pinfo4->pPrinterName, NULL, NULL);

        free(pinfo4);
    }

    return hdc;
}