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program stores the item s name, the number on hand, and its cost Next, the program prompts the user for the name of an item It then searches the database If the item is found, the inventory information is displayed

CALL THE UPDATEPIXELDATA METHOD WHEN THE MOUSE MOVES ACTION 1 In the MainForm.cs [Design] window, add a MouseMove event handler for the pnlPhoto object. Call the UpdatePixelData method with the current mouse pointer coordinates. RESULT

/* Use BinaryReader and BinaryWriter to implement a simple inventory program */ using System; using SystemIO; class Inventory { static void Main() { BinaryWriter dataOut; BinaryReader dataIn; string item; // name of item int onhand; // number on hand double cost; // cost try { dataOut = new BinaryWriter(new FileStream("inventorydat", FileModeCreate)); } catch(IOException exc) { ConsoleWriteLine("Cannot Open Inventory File For Output"); ConsoleWriteLine(excMessage); return; } // Write some inventory data to the file try { dataOutWrite("Hammers"); dataOutWrite(10); dataOutWrite(395); dataOutWrite("Screwdrivers"); dataOutWrite(18); dataOutWrite(150); dataOutWrite("Pliers"); dataOutWrite(5); dataOutWrite(495); dataOutWrite("Saws"); dataOutWrite(8); dataOutWrite(895); } catch(IOException exc) { ConsoleWriteLine("Error Writing Inventory File"); ConsoleWriteLine(excMessage); } dataOutClose();

protected void pnlPhoto_MouseMove (object sender, System.Windows.Forms.MouseEventArgs e) { UpdatePixelData(e.X, e.Y); }

14:

ConsoleWriteLine(); // Now, open inventory file for reading try { dataIn = new BinaryReader(new FileStream("inventorydat", FileModeOpen)); } catch(IOException exc) { ConsoleWriteLine("Cannot Open Inventory File For Input"); ConsoleWriteLine(excMessage); return; } // Lookup item entered by user ConsoleWrite("Enter item to lookup: "); string what = ConsoleReadLine(); ConsoleWriteLine(); try { for(;;) { // Read an inventory entry item = dataInReadString(); onhand = dataInReadInt32(); cost = dataInReadDouble(); // See if the item matches the one requested // If so, display information if(itemCompareTo(what) == 0) { ConsoleWriteLine(onhand + " " + item + " on hand " + "Cost: {0:C} each", cost); ConsoleWriteLine("Total value of {0}: {1:C}" , item, cost * onhand); break; } } } catch(EndOfStreamException) { ConsoleWriteLine("Item not found"); } catch(IOException exc) { ConsoleWriteLine("Error Reading Inventory File"); ConsoleWriteLine(excMessage); } dataInClose(); } }

The MouseMove event handler receives a MouseEventArgs parameter containing, among other event data, an X and Y property defining the current coordinates of the mouse pointer in the control s coordinates. We will discuss this and other mouse events in chapter 12, so we will not go into more detail on this handler here. The one other instance when the pixel values must be updated is when the displayed image changes. The easiest place to track this is when the Panel is painted in the pnlPhoto_Paint method. Continuing the previous steps:

.

Here is a sample run:

CALL UPDATEPIXELDATA WHEN CURRENT PHOTO CHANGES Action 3 Locate the pnlPhoto_Paint method in the MainForm.cs source file. Call UpdatePixelData if a new photo is displayed. Result

Enter item to look up: Screwdrivers 18 Screwdrivers on hand Cost: $150 each Total value of Screwdrivers: $2700

Part I:

protected void pnlPhoto_Paint(. . .) {

In the program, notice how inventory information is stored in its binary format Thus, the number of items on hand and the cost is stored using their binary format rather than their human-readable text-based equivalents This makes it is possible to perform computations on the numeric data without having to convert it from its human-readable form There is one other point of interest in the inventory program Notice how the end of the file is detected Since the binary input methods throw an EndOfStreamException when the end of the stream is reached, the program simply reads the file until either it finds the desired item or this exception is generated Thus, no special mechanism is needed to detect the end of the file

// Update PixelDlg if photo has changed if ((_dlgPixel != null) && (_nPixelDlgIndex != _album.CurrentPosition)) { _nPixelDlgIndex = _album.CurrentPosition; Point p = pnlPhoto.PointToClient( Form.MousePosition); UpdatePixelData(p.X, p.Y); } // Paint the current photo, if any if (_album.Count > 0) { . . . } }