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We saw last time one of the deadlocks you can run into when playing with pipes. Today we'll look at another one: Our program runs a helper process with stdin/stdout/stderr redirected. The helper process takes input via stdin and prints the result to stdout. Sometimes we find that the from the controlling process into the stdin pipe hangs. Clos...

Pipe in, pipe out.

A customer was having trouble manipulating the stdin stream that was given to a process. How do you simulate sending Ctrl+Z to a hidden console process programmatically? I am using and want to send the console a Ctrl+Z. I've tried sending ASCII code 26, but that doesn't work. supports Ctrl+C and Ctrl+Break but not Ctrl+Z. Here's what I'm ...

A customer had a problem involving heap corruption. In our code, we call and then for each heap, we call to enable the low fragmentation heap. However, the application crashes due to an invalid heap handle. My question is, why do we need to allocate an array of size 1025 even though we pass 1024 to ? Ha, faked you out with that question...

Setting the attribute in your key indicates that your application can accept a URL on the command line as the document to be opened. The documentation for this attribute is a confusing blend of raw documentation, guidance, history, and an example. Let's tease the parts apart so you won't confuse the example with the contract. The raw documentat...

The integral types , , and are 32 bits wide on 32-bit systems and 64 bits wide on 64-bit systems. What happens when a 32-bit process sends a message to a 64-bit window or vice versa? There's really only one choice when converting a 64-bit value to a 32-bit value: Truncation. When a 64-bit process sends a message to a 32-bit window, the 64-bit ...

A customer wanted to display the Find Printers dialog programmatically to let the user pick a printer from Active Directory and wanted to know whether this was possible. Yes, it's possible, and there's more than one way to do it. There's the lazy way and the overachieving way. The overachieving way is to use the method. The sample function spe...

A customer reported that the function was wrapping text "at the wrong location." Our program displays a message with the function, and we use the '\n' character to force line breaks at positions we choose. But we've found that starting in Windows Vista, the line breaks we placed are not working. The function is inserting its own line break...

A customer had this question: I'd like to know how to get a window to remain visible, even when the user has selected Show Desktop. Right now, when the user picks Show Desktop, the desktop appears and covers my window. Um, yeah, because that's the whole point of Show Desktop: To show the desktop and get rid of all those windows that are in the w...