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We create a byte array of this length to hold the data as it s read from the SqlDataReader by calling its GetBytes method This takes no fewer than five parameters: The index of the column in the reader (one in this case, because the image is the second column) The position in the data we want to start reading from; because we re reading in chunks of 4096 bytes, this will be zero for the first read, 4096 for the second, 8192 for the third, and so on The byte array that we want to store the data in The position in the byte array buffer where we want to write the data to; we ll always write to the beginning of the array, so this will always be zero The number of bytes we want to read This is the value stored in our length variable, or 4096.

This method sets the indent level for each row to its row number, so row 0 will have an indent level of 0, row 1 will have an indent level of 1, and so on. An indent level is simply an integer that tells the table view to move that row a little to the right. The higher the number, the further to the right the row will be indented. You might use this technique, for example, to indicate that one row is subordinate to another row, as Mail does when representing subfolders. When we run the application again, you can see that each row is now drawn a little further to the right than the last one (see Figure 8-13).

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Changing contracts is a tricky situation no matter how careful you are You can change contracts in many ways by adding, removing, or modifying and you can cause many issues on both ends of the wire These can range from obvious issues where an exception is thrown, to more complex ones where the data may lack integrity and not make sense Figure 11 2 shows a versioning decision tree that you can use to predict the effects of any changes applied to the data contracts The versioning decisions are depicted with diamonds, and the actions based on those decisions are represented as rectangles The arrows represent the direction of the flow The dark-gray actions represent nonbreaking changes, and light-gray ones show breaking changes Let s take an example service and walk through the flowchart.

The table s delegate can use two methods to determine if the user has selected a particular row. One method gets called before the row gets selected and can be used to prevent the row from being selected or can even change which row gets selected. Let s implement that method and specify that the first row is not selectable. Add the following method to the end of Simple_TableViewController.m, just before the @end declaration:

-(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row];

When you need to modify your existing service and can do so by adding a new service, then the easiest way is to use service contract inheritance This new type will point to a new endpoint, which only the new consumers of this service will be aware of; the existing consumers will continue using the existing published version of the service However, if this is not an option, then changing the data contract may be difficult If you need to add more data, the easiest option is to add new optional data members (as shown in Figure 11 2) If adding new members is not an option and you need to change the service operation and its corresponding data contract, then, as shown in the decision tree, it is best to implement a new version of the data contract (depicted as v.

This method returns the actual number of bytes read While there s still more data to be read, this will be 4096, but on the last loop there will be fewer than 4096 bytes left to read, so we need to carry on reading more chunks of data until the return value is less than our length variable As we retrieve each block of byte data, we use our binary writer to write it out to our file stream Finally, when we ve finished writing the data, we flush and close the BinaryWriter By completing a flush at the end of our processing, we are ensuring that all the data is written and there is nothing left in any buffers int length = 4096; byte[]pictBlob = new byte[length]; int startPoint = 0; long retval = sqlReaderGetBytes(1, binOutputWrite(pictBlob,0 ,(int) while (retval == length) { startPoint += length;.

if (row == 0) return nil; return indexPath; }

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