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    <p>How to retrieve and set the default printer in Windows:</p> <p><a href="http://support.microsoft.com/default.aspx?scid=kb;EN-US;246772" rel="nofollow noreferrer">http://support.microsoft.com/default.aspx?scid=kb;EN-US;246772</a></p> <p>Code from now-unavailable article:</p> <pre><code>// You are explicitly linking to GetDefaultPrinter because linking // implicitly on Windows 95/98 or NT4 results in a runtime error. // This block specifies which text version you explicitly link to. #ifdef UNICODE #define GETDEFAULTPRINTER "GetDefaultPrinterW" #else #define GETDEFAULTPRINTER "GetDefaultPrinterA" #endif // Size of internal buffer used to hold "printername,drivername,portname" // string. You may have to increase this for huge strings. #define MAXBUFFERSIZE 250 /*----------------------------------------------------------------*/ /* DPGetDefaultPrinter */ /* */ /* Parameters: */ /* pPrinterName: Buffer alloc'd by caller to hold printer name. */ /* pdwBufferSize: On input, ptr to size of pPrinterName. */ /* On output, min required size of pPrinterName. */ /* */ /* NOTE: You must include enough space for the NULL terminator! */ /* */ /* Returns: TRUE for success, FALSE for failure. */ /*----------------------------------------------------------------*/ BOOL DPGetDefaultPrinter(LPTSTR pPrinterName, LPDWORD pdwBufferSize) { BOOL bFlag; OSVERSIONINFO osv; TCHAR cBuffer[MAXBUFFERSIZE]; PRINTER_INFO_2 *ppi2 = NULL; DWORD dwNeeded = 0; DWORD dwReturned = 0; HMODULE hWinSpool = NULL; PROC fnGetDefaultPrinter = NULL; // What version of Windows are you running? osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx(&amp;osv); // If Windows 95 or 98, use EnumPrinters. if (osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) { // The first EnumPrinters() tells you how big our buffer must // be to hold ALL of PRINTER_INFO_2. Note that this will // typically return FALSE. This only means that the buffer (the 4th // parameter) was not filled in. You do not want it filled in here. SetLastError(0); bFlag = EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, NULL, 0, &amp;dwNeeded, &amp;dwReturned); { if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0)) return FALSE; } // Allocate enough space for PRINTER_INFO_2. ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded); if (!ppi2) return FALSE; // The second EnumPrinters() will fill in all the current information. bFlag = EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, (LPBYTE)ppi2, dwNeeded, &amp;dwNeeded, &amp;dwReturned); if (!bFlag) { GlobalFree(ppi2); return FALSE; } // If specified buffer is too small, set required size and fail. if ((DWORD)lstrlen(ppi2-&gt;pPrinterName) &gt;= *pdwBufferSize) { *pdwBufferSize = (DWORD)lstrlen(ppi2-&gt;pPrinterName) + 1; GlobalFree(ppi2); return FALSE; } // Copy printer name into passed-in buffer. lstrcpy(pPrinterName, ppi2-&gt;pPrinterName); // Set buffer size parameter to minimum required buffer size. *pdwBufferSize = (DWORD)lstrlen(ppi2-&gt;pPrinterName) + 1; } // If Windows NT, use the GetDefaultPrinter API for Windows 2000, // or GetProfileString for version 4.0 and earlier. else if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT) { if (osv.dwMajorVersion &gt;= 5) // Windows 2000 or later (use explicit call) { hWinSpool = LoadLibrary("winspool.drv"); if (!hWinSpool) return FALSE; fnGetDefaultPrinter = GetProcAddress(hWinSpool, GETDEFAULTPRINTER); if (!fnGetDefaultPrinter) { FreeLibrary(hWinSpool); return FALSE; } bFlag = fnGetDefaultPrinter(pPrinterName, pdwBufferSize); FreeLibrary(hWinSpool); if (!bFlag) return FALSE; } else // NT4.0 or earlier { // Retrieve the default string from Win.ini (the registry). // String will be in form "printername,drivername,portname". if (GetProfileString("windows", "device", ",,,", cBuffer, MAXBUFFERSIZE) &lt;= 0) return FALSE; // Printer name precedes first "," character. strtok(cBuffer, ","); // If specified buffer is too small, set required size and fail. if ((DWORD)lstrlen(cBuffer) &gt;= *pdwBufferSize) { *pdwBufferSize = (DWORD)lstrlen(cBuffer) + 1; return FALSE; } // Copy printer name into passed-in buffer. lstrcpy(pPrinterName, cBuffer); // Set buffer size parameter to minimum required buffer size. *pdwBufferSize = (DWORD)lstrlen(cBuffer) + 1; } } // Clean up. if (ppi2) GlobalFree(ppi2); return TRUE; } #undef MAXBUFFERSIZE #undef GETDEFAULTPRINTER // You are explicitly linking to SetDefaultPrinter because implicitly // linking on Windows 95/98 or NT4 results in a runtime error. // This block specifies which text version you explicitly link to. #ifdef UNICODE #define SETDEFAULTPRINTER "SetDefaultPrinterW" #else #define SETDEFAULTPRINTER "SetDefaultPrinterA" #endif /*-----------------------------------------------------------------*/ /* DPSetDefaultPrinter */ /* */ /* Parameters: */ /* pPrinterName: Valid name of existing printer to make default. */ /* */ /* Returns: TRUE for success, FALSE for failure. */ /*-----------------------------------------------------------------*/ BOOL DPSetDefaultPrinter(LPTSTR pPrinterName) { BOOL bFlag; OSVERSIONINFO osv; DWORD dwNeeded = 0; HANDLE hPrinter = NULL; PRINTER_INFO_2 *ppi2 = NULL; LPTSTR pBuffer = NULL; LONG lResult; HMODULE hWinSpool = NULL; PROC fnSetDefaultPrinter = NULL; // What version of Windows are you running? osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx(&amp;osv); if (!pPrinterName) return FALSE; // If Windows 95 or 98, use SetPrinter. if (osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) { // Open this printer so you can get information about it. bFlag = OpenPrinter(pPrinterName, &amp;hPrinter, NULL); if (!bFlag || !hPrinter) return FALSE; // The first GetPrinter() tells you how big our buffer must // be to hold ALL of PRINTER_INFO_2. Note that this will // typically return FALSE. This only means that the buffer (the 3rd // parameter) was not filled in. You do not want it filled in here. SetLastError(0); bFlag = GetPrinter(hPrinter, 2, 0, 0, &amp;dwNeeded); if (!bFlag) { if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0)) { ClosePrinter(hPrinter); return FALSE; } } // Allocate enough space for PRINTER_INFO_2. ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded); if (!ppi2) { ClosePrinter(hPrinter); return FALSE; } // The second GetPrinter() will fill in all the current information // so that all you have to do is modify what you are interested in. bFlag = GetPrinter(hPrinter, 2, (LPBYTE)ppi2, dwNeeded, &amp;dwNeeded); if (!bFlag) { ClosePrinter(hPrinter); GlobalFree(ppi2); return FALSE; } // Set default printer attribute for this printer. ppi2-&gt;Attributes |= PRINTER_ATTRIBUTE_DEFAULT; bFlag = SetPrinter(hPrinter, 2, (LPBYTE)ppi2, 0); if (!bFlag) { ClosePrinter(hPrinter); GlobalFree(ppi2); return FALSE; } // Tell all open programs that this change occurred. // Allow each program 1 second to handle this message. lResult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0L, (LPARAM)(LPCTSTR)"windows", SMTO_NORMAL, 1000, NULL); } // If Windows NT, use the SetDefaultPrinter API for Windows 2000, // or WriteProfileString for version 4.0 and earlier. else if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT) { if (osv.dwMajorVersion &gt;= 5) // Windows 2000 or later (use explicit call) { hWinSpool = LoadLibrary("winspool.drv"); if (!hWinSpool) return FALSE; fnSetDefaultPrinter = GetProcAddress(hWinSpool, SETDEFAULTPRINTER); if (!fnSetDefaultPrinter) { FreeLibrary(hWinSpool); return FALSE; } bFlag = fnSetDefaultPrinter(pPrinterName); FreeLibrary(hWinSpool); if (!bFlag) return FALSE; } else // NT4.0 or earlier { // Open this printer so you can get information about it. bFlag = OpenPrinter(pPrinterName, &amp;hPrinter, NULL); if (!bFlag || !hPrinter) return FALSE; // The first GetPrinter() tells you how big our buffer must // be to hold ALL of PRINTER_INFO_2. Note that this will // typically return FALSE. This only means that the buffer (the 3rd // parameter) was not filled in. You do not want it filled in here. SetLastError(0); bFlag = GetPrinter(hPrinter, 2, 0, 0, &amp;dwNeeded); if (!bFlag) { if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0)) { ClosePrinter(hPrinter); return FALSE; } } // Allocate enough space for PRINTER_INFO_2. ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded); if (!ppi2) { ClosePrinter(hPrinter); return FALSE; } // The second GetPrinter() fills in all the current&lt;BR/&gt; // information. bFlag = GetPrinter(hPrinter, 2, (LPBYTE)ppi2, dwNeeded, &amp;dwNeeded); if ((!bFlag) || (!ppi2-&gt;pDriverName) || (!ppi2-&gt;pPortName)) { ClosePrinter(hPrinter); GlobalFree(ppi2); return FALSE; } // Allocate buffer big enough for concatenated string. // String will be in form "printername,drivername,portname". pBuffer = (LPTSTR)GlobalAlloc(GPTR, lstrlen(pPrinterName) + lstrlen(ppi2-&gt;pDriverName) + lstrlen(ppi2-&gt;pPortName) + 3); if (!pBuffer) { ClosePrinter(hPrinter); GlobalFree(ppi2); return FALSE; } // Build string in form "printername,drivername,portname". lstrcpy(pBuffer, pPrinterName); lstrcat(pBuffer, ","); lstrcat(pBuffer, ppi2-&gt;pDriverName); lstrcat(pBuffer, ","); lstrcat(pBuffer, ppi2-&gt;pPortName); // Set the default printer in Win.ini and registry. bFlag = WriteProfileString("windows", "device", pBuffer); if (!bFlag) { ClosePrinter(hPrinter); GlobalFree(ppi2); GlobalFree(pBuffer); return FALSE; } } // Tell all open programs that this change occurred. // Allow each app 1 second to handle this message. lResult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0L, 0L, SMTO_NORMAL, 1000, NULL); } // Clean up. if (hPrinter) ClosePrinter(hPrinter); if (ppi2) GlobalFree(ppi2); if (pBuffer) GlobalFree(pBuffer); return TRUE; } #undef SETDEFAULTPRINTER </code></pre>
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