Showing tag results for Code

Oct 19, 2012
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Using WM_COPYDATA to marshal message parameters since the window manager otherwise doesn’t know how

Raymond Chen

Miral asks for the recommended way of passing messages across processes if they require custom marshaling. There is no one recommended way of doing the custom marshaling, although some are hackier than others. Probably the most architecturally beautiful way of doing it is to use a mechanism that does perform automatic marshaling, like COM and MI...

Code
Oct 11, 2012
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Combo boxes have supported incremental searching for quite some time now

Raymond Chen

Back in August 2007, I promised to post a program the following day but it appears that I never did. Oops. I discovered this as I went through my "things to blog about" pile and figured better late than never. Though five years late is pretty bad. Here's a program which fills a combo box with some strings. Run this program and start typing: "...

Code
Oct 5, 2012
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How do I override the default icon selection algorithm?

Raymond Chen

The usual way of loading an icon from a resource is to use the or function and letting the window manager's icon selection algorithm decide which image to use based on the images available in the icon, the desired icon size, and the current color depth. A customer wanted to override that algorithm, because the window manager uses the current dis...

Code
Oct 4, 2012
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Why does RegOpenKey sometimes (but not always) fail if I use two backslashes instead of one?

Raymond Chen

A customer reported that on Windows XP, they observed that their program would very rarely get the error when they passed two backslashes instead of one to the function: After removing C++ escapes, the resulting string passed to is The failure was very sporadic and not reproducible under controlled conditions. Well, first of all, d...

Code
Oct 3, 2012
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How do I suppress the default animation that occurs when I hide or show a window?

Raymond Chen

A customer wanted to know how they can disable the default fade-in/fade-out animation that occurs when a window is hidden or shown. "I don't want to use because that causes my window to disappear from the taskbar. I tried but that affects the entire desktop and is too jarring. We want to suppress the effect because our program replaces one windo...

Code
Sep 27, 2012
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Why aren't environment variables being expanded in my RGS file?

Raymond Chen

A customer was having trouble with their RGS file. I want to include the below line in a .rgs file: When I do this, registering of the dll fails with 80002009. Any help? If I change it to then the registration succeeds (but of course now contains a hard-coded path). A common problem people have when asking a question is assuming that th...

Code
Sep 26, 2012
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Sabotaging yourself: Closing a handle and then using it

Raymond Chen

A customer reported a problem with the function: I have a DLL with an function and an function. The code goes like this: Under certain conditions, the function is called twice, and the function is correspondingly called twice. Under these conditions, if I run the code on a single-processor system with hyperthreading disabled, then every...

Code
Sep 21, 2012
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How can I implement SAFEARRAY.ToString() without going insane?

Raymond Chen

A colleague needed some help with manipulating s. I have some generic code to execute WMI queries and store the result as strings. Normally, does the work, but doesn't know how to convert arrays (e.g. ). And there doesn't seem to be an easy way to convert the array element-by-element because expects a pointer to an object of the underlying ty...

Code
Sep 20, 2012
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How do I invoke a verb on an IShellItemArray?

Raymond Chen

A customer wanted to invoke a command on multiple items at once. I have an , and I want to invoke a verb with that array as the parameter. I know that I can invoke a verb on a single by the code below, but how do I pass an entire array? The function invokes the command by extracting the pidl, then asking to invoke the command on the pidl...

Code