Added class PrintTransport to simplify the usage of a print transport add-on.
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/*
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PrintTransport
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Copyright (c) 2004 OpenBeOS.
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Authors:
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Michael Pfeiffer
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Philippe Houdoin
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef PRINT_TRANSPORT_H
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#define PRINT_TRANSPORT_H
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#include <image.h>
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#include <DataIO.h>
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#include <Node.h>
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#include <Message.h>
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// The class PrintTransport is intended to be used by
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// a printer driver.
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class PrintTransport
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{
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public:
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PrintTransport();
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~PrintTransport();
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// opens the transport add-on associated with the printerFolder
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status_t Open(BNode* printerFolder);
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// returns the output stream created by the transport add-on
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BDataIO* GetDataIO();
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// returns false if the user has canceled the save to file dialog
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// of the "Print To File" transport add-on.
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bool IsPrintToFileCanceled() const;
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private:
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BDataIO* fDataIO;
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image_id fAddOnID;
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void (*fExitProc)(void);
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};
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#endif PRINT_TRANSPORT_H
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@ -8,6 +8,7 @@ StaticLibrary
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PicturePrinter.cpp
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PrintJobReader.cpp
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PictureIterator.cpp
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PrintTransport.cpp
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;
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StaticLibrary
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@ -0,0 +1,133 @@
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/*
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PrintTransport
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Copyright (c) 2004 OpenBeOS.
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Authors:
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Philippe Houdoin
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Michael Pfeiffer
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "PrintTransport.h"
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#include <Directory.h>
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#include <File.h>
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#include <FindDirectory.h>
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#include <Path.h>
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#include <String.h>
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// implementation of class PrintTransport
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PrintTransport::PrintTransport()
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: fDataIO(NULL)
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, fAddOnID(-1)
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, fExitProc(NULL)
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{
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}
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PrintTransport::~PrintTransport()
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{
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if (fExitProc) {
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(*fExitProc)();
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fExitProc = NULL;
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}
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if (fAddOnID >= 0) {
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unload_add_on(fAddOnID);
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fAddOnID = -1;
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}
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}
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status_t PrintTransport::Open(BNode* printerFolder)
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{
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// already opened?
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if (fDataIO != NULL) {
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return B_ERROR;
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}
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// retrieve transport add-on name from printer folder attribute
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BString transportName;
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if (printerFolder->ReadAttrString("transport", &transportName) != B_OK) {
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return B_ERROR;
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}
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// try first in user add-ons directory
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BPath path;
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find_directory(B_USER_ADDONS_DIRECTORY, &path);
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path.Append("Print/transport");
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path.Append(transportName.String());
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fAddOnID = load_add_on(path.Path());
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if (fAddOnID < 0) {
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// on failure try in system add-ons directory
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find_directory(B_BEOS_ADDONS_DIRECTORY, &path);
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path.Append("Print/transport");
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path.Append(transportName.String());
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fAddOnID = load_add_on(path.Path());
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}
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if (fAddOnID < 0) {
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// failed to load transport add-on
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return B_ERROR;
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}
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// get init & exit proc
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BDataIO* (*initProc)(BMessage*);
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get_image_symbol(fAddOnID, "init_transport", B_SYMBOL_TYPE_TEXT, (void **) &initProc);
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get_image_symbol(fAddOnID, "exit_transport", B_SYMBOL_TYPE_TEXT, (void **) &fExitProc);
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if (initProc == NULL || fExitProc == NULL) {
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// transport add-on has not the proper interface
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return B_ERROR;
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}
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// now, initialize the transport add-on
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node_ref ref;
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BDirectory dir;
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printerFolder->GetNodeRef(&ref);
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dir.SetTo(&ref);
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if (path.SetTo(&dir, NULL) != B_OK) {
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return B_ERROR;
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}
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// request BDataIO object from transport add-on
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BMessage input('TRIN');
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input.AddString("printer_file", path.Path());
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fDataIO = (*initProc)(&input);
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return B_OK;
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}
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BDataIO*
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PrintTransport::GetDataIO()
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{
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return fDataIO;
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}
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bool PrintTransport::IsPrintToFileCanceled() const
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{
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// The BeOS "Print To File" transport add-on returns a non-NULL BDataIO *
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// even after user filepanel cancellation!
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BFile* file = dynamic_cast<BFile*>(fDataIO);
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return file != NULL && file->InitCheck() != B_OK;
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}
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