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private void menuEditLabel_Click (object sender, System.EventArgs e) { if (treeViewMain.Focused) { if (treeViewMain.SelectedNode != null) treeViewMain.SelectedNode.BeginEdit(); } else if (listViewMain.SelectedItems.Count > 0) listViewMain.SelectedItems[0].BeginEdit(); } private void treeViewMain_AfterLabelEdit (object sender, System.Windows. Forms.NodeLabelEditEventArgs e) { if (e.Label == null) { // Edit cancelled by the user e.CancelEdit = true; return; } // No changes required for root node if (e.Node.Parent == null) return; string fileName = e.Node.Tag as string; if (Path.GetExtension(fileName) == ".abm") e.CancelEdit = !UpdateAlbumName(e.Label, e.Node); else e.CancelEdit = !UpdatePhotoCaption(e.Label, e.Node); }

This program produces the following output:

B-26

a. Cancel the edit if the new text is null. b. Do nothing if the node is a root node. c. For an album node, use the UpdateAlbumName.method. d. For a photograph node, use the UpdatePhotoCaption method. Note: We permit the user to edit the root node here to alter a top-level name in the tree, even though this change is discarded when the application exits. A more robust solution might be to prevent this from occurring, or to save the change in a configuration file. 6 Rewrite the UpdateAlbumName method to accommodate both list items and tree nodes.

Enter a positive number: -20 Not Positive: -20

The program prompts the user for a positive number If a negative number is entered, an object of the class MyException is created that describes the error Thus, MyException encapsulates information about the error This information is then used by the exception handler In general, you will want to create exception classes that will encapsulate information about an error to enable the exception handler to respond effectively

private bool UpdateAlbumName (string newName, object obj) { ListViewItem item = obj as ListViewItem; TreeNode node = obj as TreeNode; // Determine the file name string fileName = null; if (item != null) { fileName = item.Tag as string; node = FindNode(fileName, false); } else if (node != null) fileName = node.Tag as string;

Table B10 ISO 639 Language Codes (continued)

As stated, you can have more than one catch associated with a try In fact, it is common to do so However, each catch must catch a different type of exception For example, this program catches both integers and strings

a. Change the second parameter to an object rather than a ListViewItem. b. Convert the given object to both a list item and a tree node. c. Determine the file name for the appropriate object. d. If the object is a list view item, also find the node corresponding to this item.

#include <iostream> using namespace std; // Different types of exceptions can be caught void Xhandler(int test) { try{ if(test) throw test; else throw "Value is zero"; } catch(int i) { cout << "Caught Exception #: " << i << '\n';

25:

Note: Recall that the list view s AfterLabelEdit event handler from chapter 14 provides a ListViewItem object when calling this method. This invocation is still valid and is properly dealt with by this code.

639-2/T sog som son sot spa sqi srd srn* srp srr ssa ssw suk sun sus sux swa swe syc* syr tah tai tam tat tel tem ter tet tgk tgl tha tig tir tiv tkl tlh* tli tmh tog ton tpi tsi tsn tso tuk 639-1 so st es sq sc sr Hex 534F 5354 4553 5351 5343 5352 Dec 8379 8384 6983 8381 8367 8382 Language Name Sogdian Somali Songhai languages Sotho, Southern Spanish; Castilian Albanian Sardinian Sranan Tongo Serbian Serer Nilo-Saharan Swati Sukuma Sundanese Susu Sumerian Swahili Swedish Classical Syriac Syriac Tahitian Tai Tamil Tatar Telugu Timne Tereno Tetum Tajik Tagalog Thai Tigre Tigrinya Tiv Tokelau Klingon; tlhIngan-Hol Tlingit Tamashek Tonga (Nyasa) Tonga (Tonga Islands) Tok Pisin Tsimshian Tswana Tsonga Turkmen

} catch(char *str) { cout << "Caught a string: "; cout << str << '\n'; } } int main() { cout << "Start\n"; Xhandler(1); Xhandler(2); Xhandler(0); Xhandler(3); cout << "End"; return 0; } C++

// Rename the file string newFileName = null; if (fileName != null) { newFileName = RenameFile(fileName, newName, ".abm"); } if (newFileName == null) { MessageBox.Show("Unable to rename album " + "to this name."); return false; }

This program produces the following output:

5353 5355

Update the Tag property for the appropriate object. Note: When the object is a list item, this updates the corresponding node as well.

#: 1 #: 2 Value is zero #: 3