1 /* 2 3 PrintTransport 4 5 Copyright (c) 2004 OpenBeOS. 6 7 Authors: 8 Philippe Houdoin 9 Michael Pfeiffer 10 11 Permission is hereby granted, free of charge, to any person obtaining a copy of 12 this software and associated documentation files (the "Software"), to deal in 13 the Software without restriction, including without limitation the rights to 14 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 15 of the Software, and to permit persons to whom the Software is furnished to do 16 so, subject to the following conditions: 17 18 The above copyright notice and this permission notice shall be included in all 19 copies or substantial portions of the Software. 20 21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 24 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 25 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 26 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 27 THE SOFTWARE. 28 29 */ 30 31 #include "PrintTransport.h" 32 33 #include <Directory.h> 34 #include <File.h> 35 #include <FindDirectory.h> 36 #include <Path.h> 37 #include <String.h> 38 39 // implementation of class PrintTransport 40 PrintTransport::PrintTransport() 41 : fDataIO(NULL) 42 , fAddOnID(-1) 43 , fExitProc(NULL) 44 { 45 } 46 47 PrintTransport::~PrintTransport() 48 { 49 if (fExitProc) { 50 (*fExitProc)(); 51 fExitProc = NULL; 52 } 53 54 if (fAddOnID >= 0) { 55 unload_add_on(fAddOnID); 56 fAddOnID = -1; 57 } 58 } 59 60 status_t PrintTransport::Open(BNode* printerFolder) 61 { 62 // already opened? 63 if (fDataIO != NULL) { 64 return B_ERROR; 65 } 66 67 // retrieve transport add-on name from printer folder attribute 68 BString transportName; 69 if (printerFolder->ReadAttrString("transport", &transportName) != B_OK) { 70 return B_ERROR; 71 } 72 73 // try first in user add-ons directory 74 BPath path; 75 find_directory(B_USER_ADDONS_DIRECTORY, &path); 76 path.Append("Print/transport"); 77 path.Append(transportName.String()); 78 fAddOnID = load_add_on(path.Path()); 79 80 if (fAddOnID < 0) { 81 // on failure try in system add-ons directory 82 find_directory(B_BEOS_ADDONS_DIRECTORY, &path); 83 path.Append("Print/transport"); 84 path.Append(transportName.String()); 85 fAddOnID = load_add_on(path.Path()); 86 } 87 88 if (fAddOnID < 0) { 89 // failed to load transport add-on 90 return B_ERROR; 91 } 92 93 // get init & exit proc 94 BDataIO* (*initProc)(BMessage*); 95 get_image_symbol(fAddOnID, "init_transport", B_SYMBOL_TYPE_TEXT, (void **) &initProc); 96 get_image_symbol(fAddOnID, "exit_transport", B_SYMBOL_TYPE_TEXT, (void **) &fExitProc); 97 98 if (initProc == NULL || fExitProc == NULL) { 99 // transport add-on has not the proper interface 100 return B_ERROR; 101 } 102 103 // now, initialize the transport add-on 104 node_ref ref; 105 BDirectory dir; 106 107 printerFolder->GetNodeRef(&ref); 108 dir.SetTo(&ref); 109 110 if (path.SetTo(&dir, NULL) != B_OK) { 111 return B_ERROR; 112 } 113 114 // request BDataIO object from transport add-on 115 BMessage input('TRIN'); 116 input.AddString("printer_file", path.Path()); 117 fDataIO = (*initProc)(&input); 118 return B_OK; 119 } 120 121 BDataIO* 122 PrintTransport::GetDataIO() 123 { 124 return fDataIO; 125 } 126 127 bool PrintTransport::IsPrintToFileCanceled() const 128 { 129 // The BeOS "Print To File" transport add-on returns a non-NULL BDataIO * 130 // even after user filepanel cancellation! 131 BFile* file = dynamic_cast<BFile*>(fDataIO); 132 return fDataIO == NULL || file != NULL && file->InitCheck() != B_OK; 133 } 134