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 const directory_which paths[] = { 74 B_USER_ADDONS_DIRECTORY, 75 B_COMMON_ADDONS_DIRECTORY, 76 B_SYSTEM_ADDONS_DIRECTORY, 77 }; 78 BPath path; 79 for (uint32 i = 0; i < sizeof(paths) / sizeof(paths[0]); ++i) { 80 if (find_directory(paths[i], &path) != B_OK) 81 continue; 82 path.Append("Print/transport"); 83 path.Append(transportName.String()); 84 fAddOnID = load_add_on(path.Path()); 85 if (fAddOnID >= 0) 86 break; 87 } 88 89 if (fAddOnID < 0) { 90 // failed to load transport add-on 91 return B_ERROR; 92 } 93 94 // get init & exit proc 95 BDataIO* (*initProc)(BMessage*); 96 get_image_symbol(fAddOnID, "init_transport", B_SYMBOL_TYPE_TEXT, (void **) &initProc); 97 get_image_symbol(fAddOnID, "exit_transport", B_SYMBOL_TYPE_TEXT, (void **) &fExitProc); 98 99 if (initProc == NULL || fExitProc == NULL) { 100 // transport add-on has not the proper interface 101 return B_ERROR; 102 } 103 104 // now, initialize the transport add-on 105 node_ref ref; 106 BDirectory dir; 107 108 printerFolder->GetNodeRef(&ref); 109 dir.SetTo(&ref); 110 111 if (path.SetTo(&dir, NULL) != B_OK) { 112 return B_ERROR; 113 } 114 115 // request BDataIO object from transport add-on 116 BMessage input('TRIN'); 117 input.AddString("printer_file", path.Path()); 118 fDataIO = (*initProc)(&input); 119 return B_OK; 120 } 121 122 BDataIO* 123 PrintTransport::GetDataIO() 124 { 125 return fDataIO; 126 } 127 128 bool PrintTransport::IsPrintToFileCanceled() const 129 { 130 // The BeOS "Print To File" transport add-on returns a non-NULL BDataIO * 131 // even after user filepanel cancellation! 132 BFile* file = dynamic_cast<BFile*>(fDataIO); 133 return fDataIO == NULL || (file != NULL && file->InitCheck() != B_OK); 134 } 135