Printer DC

#include<windows.h>
#include<vector>

std::vector<char*> query_printers(){
    DWORD dwReturned;
    DWORD dwNeeded;

    PRINTER_INFO_4 *pInfo;

    char szPrinterName[255];
    unsigned long lPrinterNameLength;

    GetDefaultPrinter(szPrinterName, &lPrinterNameLength);

    auto fnReturn = EnumPrinters(
        PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS,
        szPrinterName,
        1L,                // printer info level
        (LPBYTE)NULL,
        0L,
        &dwNeeded,
        &dwReturned);

    if (dwNeeded > 0)
    {
        pInfo = (PRINTER_INFO_4 *)HeapAlloc(
            GetProcessHeap(), 0L, dwNeeded);
    }

    if (NULL != pInfo)
    {
        dwReturned = 0;
        fnReturn = EnumPrinters(
            PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS,
            NULL,
            1L,                // printer info level
            (LPBYTE)pInfo,
            dwNeeded,
            &dwNeeded,
            &dwReturned);
    }

    std::vector<char*> names;

    if (fnReturn)
    {
        std::string cached_name;

        for (auto i = 0; i < dwReturned; i++)
        {
            cached_name = pInfo[i].pPrinterName;

            if (cached_name.find("NULL") != std::string::npos ||
                cached_name.empty())
                continue;

            names.push_back(pInfo[i].pPrinterName);
        }
    }

    return names;
}

std::vector<HDC> get_printers_dc(){

    auto printers = query_printers();
    std::vector<HDC> device_contexts;

    for (auto& printer : printers)
    {
        device_contexts.push_back(CreateDC("WINSPOOL", printer, NULL, NULL));
    }

    return device_contexts;
}

int main(){
    auto captured = get_printers_dc();

    return 0;
}