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_NONPACKAGED_ADDONS_DIRECTORY, 75 B_USER_ADDONS_DIRECTORY, 76 B_COMMON_NONPACKAGED_ADDONS_DIRECTORY, 77 B_COMMON_ADDONS_DIRECTORY, 78 B_SYSTEM_ADDONS_DIRECTORY, 79 }; 80 BPath path; 81 for (uint32 i = 0; i < sizeof(paths) / sizeof(paths[0]); ++i) { 82 if (find_directory(paths[i], &path) != B_OK) 83 continue; 84 path.Append("Print/transport"); 85 path.Append(transportName.String()); 86 fAddOnID = load_add_on(path.Path()); 87 if (fAddOnID >= 0) 88 break; 89 } 90 91 if (fAddOnID < 0) { 92 // failed to load transport add-on 93 return B_ERROR; 94 } 95 96 // get init & exit proc 97 BDataIO* (*initProc)(BMessage*); 98 get_image_symbol(fAddOnID, "init_transport", B_SYMBOL_TYPE_TEXT, (void **) &initProc); 99 get_image_symbol(fAddOnID, "exit_transport", B_SYMBOL_TYPE_TEXT, (void **) &fExitProc); 100 101 if (initProc == NULL || fExitProc == NULL) { 102 // transport add-on has not the proper interface 103 return B_ERROR; 104 } 105 106 // now, initialize the transport add-on 107 node_ref ref; 108 BDirectory dir; 109 110 printerFolder->GetNodeRef(&ref); 111 dir.SetTo(&ref); 112 113 if (path.SetTo(&dir, NULL) != B_OK) { 114 return B_ERROR; 115 } 116 117 // request BDataIO object from transport add-on 118 BMessage input('TRIN'); 119 input.AddString("printer_file", path.Path()); 120 fDataIO = (*initProc)(&input); 121 return B_OK; 122 } 123 124 BDataIO* 125 PrintTransport::GetDataIO() 126 { 127 return fDataIO; 128 } 129 130 bool PrintTransport::IsPrintToFileCanceled() const 131 { 132 // The BeOS "Print To File" transport add-on returns a non-NULL BDataIO * 133 // even after user filepanel cancellation! 134 BFile* file = dynamic_cast<BFile*>(fDataIO); 135 return fDataIO == NULL || (file != NULL && file->InitCheck() != B_OK); 136 } 137