保存/恢复打印机DevModes - wxPython / win32print

时间：2011-09-16 18:52:28

标签： python printing restore dev-mode

到目前为止，我发现了两种不同的方法来从wxPython用户界面访问我认为相同版本的Printer DevMode：

window = wx.GetTopLevelWindows()[0].GetHandle()
name = self.itemMap['device'].GetValue() # returns a valid printer name.
handle = win32print.OpenPrinter(name)
dmin = None
dmout = pywintypes.DEVMODEType()
mode = DM_IN_BUFFER | DM_OUT_BUFFER | DM_IN_PROMPT

res = win32print.DocumentProperties(window, handle, name, dmout, dmin, mode)

if res == 1:
  print dmout.DriverData

以及

dlg = wx.PrintDialog(self, dgData)

res = dlg.ShowModal()

if res == wx.ID_OK:
  print dlg.GetPrintDialogData().PrintData.GetPrivData()

这些二进制结构似乎包含控制设备输出行为的必要信息。这很好，除了它不能直接用于使用这个存储的devmode数据重新加载PrintSetup对话框。在第一种情况下，PyDEVMODE对象包含许多需要手动设置的单个属性（PyDEVMODE Reference）。在第二种情况下，有一些Getter / Setter方法可以控制某些属性，但不是所有属性（wxPrintData Reference）。是否有人知道如何从实际的DevMode（二进制数据）创建Python Devmode对象（我将采用任何一种方法，差异都是微不足道的）？我想避免手动存储/重置每个单独的属性，以便每次都以正确的状态重新打开对话框。

2 个答案:

答案 0 :(得分：0)

似乎在这一点上没有优雅的方法可以直接在Python中实现这一点。我能想出的最接近的是一个用c ++编写的dll，我可以调用它。我最终得到了完整的二进制DevMode结构，并可以从中重新加载。该c ++ dll的代码如下所示：

#include "stdafx.h"
#include <iobind/base64_policy.hpp>

#include <string>
#ifdef _UNICODE
    typedef std::wstring string_t;
#else
    typedef std::string string_t;
#endif
typedef std::string cstring;


extern "C" BOOL WINAPI DllMain( HMODULE hModule, DWORD dwReason, LPVOID lpReserved ) {
    switch ( dwReason ){
        case DLL_PROCESS_ATTACH:
            DisableThreadLibraryCalls( hModule );
            break;
        case DLL_PROCESS_DETACH:
            break;
    }

    return TRUE;
}


extern "C" DOEXPORT int CleanupA( char *output ) {
    if ( output ) {
        free( output );
        output = NULL;
    }
    return 0;
}


extern "C" DOEXPORT int CleanupW( wchar_t *output ) {
    if ( output ) {
        free( output );
        output = NULL;
    }
    return 0;
}


extern "C" DOEXPORT int printer_setup( 
        void *handle, const TCHAR *printer_in, const char *input,
        int local_only, TCHAR **printer, char **output ) 
{
    HWND hwnd = (HWND)handle;   
    HRESULT hResult = 0;

    LPPRINTDLG pPD = NULL;
    LPPRINTPAGERANGE pPageRanges = NULL;

    // Allocate structure.
    pPD = (LPPRINTDLG)GlobalAlloc(GPTR, sizeof(PRINTDLG));
    if (!pPD) return E_OUTOFMEMORY;

    //  Initialize structure.
    pPD->lStructSize = sizeof(PRINTDLG);
    pPD->hwndOwner = hwnd;

    pPD->hDevMode = NULL;
    if ( input ){
        std::string dec = iobind::encode( input, iobind::from_base64_p );
        if ( !dec.empty() ) {
            HGLOBAL devmode = pPD->hDevMode = ::GlobalAlloc(GPTR, dec.size());
            if ( devmode ){         
                LPDEVMODE src = (LPDEVMODE)&dec[0];
                memcpy( devmode, src, dec.size() );
            }
        }
    }

    pPD->hDevNames = NULL;
    if ( printer_in ){
        HGLOBAL printer = pPD->hDevNames = ::GlobalAlloc(GPTR, sizeof(DEVNAMES)+_tcslen(printer_in)*sizeof(TCHAR)+sizeof(TCHAR));
        if ( printer ){
            LPDEVNAMES dv = (LPDEVNAMES)printer;
            dv->wDefault = 0;
            dv->wDriverOffset = 0;
            dv->wOutputOffset = 0;
            dv->wDeviceOffset = sizeof(DEVNAMES)/sizeof(TCHAR);
            TCHAR *dest = (TCHAR *)(unsigned long)dv + dv->wDeviceOffset;
            _tcscpy( dest, printer_in );
        }
    }

    pPD->hDC = NULL;
    pPD->Flags = PD_PRINTSETUP;

    if ( local_only ) {
        pPD->Flags |= /*PD_ENABLESETUPHOOK |*/ PD_NONETWORKBUTTON;
        //pPD->lpfnSetupHook = SetupHookProc; //removed: doing things differently, don't like how this was working
    }

    pPD->nMinPage = 1;
    pPD->nMaxPage = 1000;
    pPD->nCopies = 1;
    pPD->hInstance = 0;
    pPD->lpPrintTemplateName = NULL;

    //  Invoke the Print property sheet.
    hResult = PrintDlg(pPD);
    if ( hResult != 0 ) {
        if ( pPD->hDevMode ) {
            LPDEVMODE devmode = (LPDEVMODE)::GlobalLock( pPD->hDevMode );
            size_t size = devmode->dmSize + devmode->dmDriverExtra;
            if ( output ) {
                std::string tmp;
                tmp.resize( size );
                memcpy( &tmp[0], devmode, tmp.size() );

                std::string enc = iobind::encode( tmp, iobind::to_base64_p );
                *output = _strdup( enc.c_str() );
            }
            ::GlobalUnlock( pPD->hDevMode );
        }

        if ( pPD->hDevNames ) {
            LPDEVNAMES devnames = (LPDEVNAMES)::GlobalLock( pPD->hDevNames );
            TCHAR *device = (TCHAR *)(unsigned long)devnames + devnames->wDeviceOffset;
            *printer = _tcsdup(device);
            ::GlobalUnlock( pPD->hDevNames );
        }
    }
    else {
        DWORD dlgerr = ::CommDlgExtendedError();
        hResult = dlgerr;
    }

    if (pPD->hDC != NULL) {
        DeleteDC( pPD->hDC );
    }
    if (pPD->hDevMode != NULL) { 
        GlobalFree( pPD->hDevMode );
    }
    if (pPD->hDevNames != NULL) {
        GlobalFree( pPD->hDevNames );
    }
    return hResult;
}

在Python中，它被调用为：

client = ctypes.cdll.LoadLibrary(os.path.join(myDir, 'rpmclient.dll'))
client.printer_setup.argtypes = [ctypes.c_void_p,
                                 ctypes.c_wchar_p,
                                 ctypes.c_char_p,
                                 ctypes.c_int32,
                                 ctypes.POINTER(ctypes.c_wchar_p),
                                 ctypes.POINTER(ctypes.c_char_p)]

client.printer_setup.restype = ctypes.c_int32
client.CleanupA.argtypes = [ctypes.c_char_p]
client.CleanupA.restype = ctypes.c_int32
client.CleanupW.argtypes = [ctypes.c_wchar_p]
client.CleanupW.restype = ctypes.c_int32

p_in = ctypes.c_wchar_p(self.itemMap['device'].GetValue())
p_out = ctypes.c_wchar_p()

d_in = ctypes.c_char_p(getattr(self, 'devmode', ''))
d_out = ctypes.c_char_p()

res = client.printer_setup(self.GetHandle(),
                           p_in,
                           d_in,
                           False,
                           p_out,
                           d_out)

if res == 0:
  return

if res > 1:
  # Error display code here.

  return

self.devmode = d_out.value

答案 1 :(得分：0)

您还可以通过在新命名对象中进行操作来编辑& wget_commands中的pDevMode对象。 

win32print.GetPrinter()

我在类似的问题中扩展了Yuri Gendelman提供的“属性”命名结构：Print PDF file in duplex mode via Python

这是我在代码中如何使用它的示例。

    import win32print, os

    name = win32print.GetDefaultPrinter()
    printdefaults = {"DesiredAccess": win32print.PRINTER_ACCESS_USE}
    handle = win32print.OpenPrinter(name, printdefaults)
    level = 2
    attributes = win32print.GetPrinter(handle, level)   
    # http://timgolden.me.uk/pywin32-docs/PyDEVMODE.html
    # Note: All pDevMode settings are int() variables

    attributes['pDevMode'].Copies = 2    # Num of copies

    #attributes['pDevMode'].Color = 1    # Color
    attributes['pDevMode'].Color = 2    # Monochrome

    attributes['pDevMode'].Collate = 1    # Collate TRUE
    #attributes['pDevMode'].Collate = 2    # Collate FALSE

以下是检查默认设置的代码：

import win32print, os def autoprint(user): name = win32print.GetDefaultPrinter() printdefaults = {"DesiredAccess": win32print.PRINTER_ACCESS_USE} handle = win32print.OpenPrinter(name, printdefaults) level = 2 attributes = win32print.GetPrinter(handle, level) # http://timgolden.me.uk/pywin32-docs/PyDEVMODE.html # All are int() variables attributes['pDevMode'].Duplex = 1 # no flip #attributes['pDevMode'].Duplex = 2 # flip up #attributes['pDevMode'].Duplex = 3 # flip over attributes['pDevMode'].Copies = 2 # Num of copies #attributes['pDevMode'].Color = 1 # Color attributes['pDevMode'].Color = 2 # Monochrome attributes['pDevMode'].Collate = 1 # Collate TRUE #attributes['pDevMode'].Collate = 2 # Collate FALSE try: win32print.SetPrinter(handle, level, attributes, 0) except: print("win32print.SetPrinter: settings could not be changed") try: newfile_name = max([downloadPath + "\\" + user["FULL_NAME"] + "PDFToBePrinted.pdf"]) Print2Copies = win32api.ShellExecute(0, 'print', newfile_name, None, '.', 0) time.sleep(1) Print2Copies print("Printing now...") win32print.ClosePrinter(handle) final_filename = max([downloadPath + "\\" + user["FULL_NAME"] + "Printed.pdf"]) os.rename(newfile_name, final_filename) except Exception as e: print(str(e)) print("--Failed to print--") time.sleep(5) win32print.GetPrinter(handle, level)['pDevMode'].Copies 

win32print.GetPrinter(handle, level)['pDevMode'].Duplex

以下是您可以通过In[115]: print(win32print.GetPrinter(handle, level)['pDevMode'].Copies) Out[115]: 1 In[116]:win32print.GetPrinter(handle, level)['pDevMode'].Duplex Out[116]: 1 In[117]:win32print.GetPrinter(handle, level)['pDevMode'].Color Out[117]: 1 更改的其他打印机设置：http://timgolden.me.uk/pywin32-docs/PyDEVMODE.html

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