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We were considering how to detect that the drag/drop operation resulted in a conceptual Move even if the DROPEFFECT_MOVE was optimized away. If the drop target is the shell, you can query the data object for CFSTR_PERFORMEDDROPEFFECT to see what the performed effect was. void OnLButtonDown(HWND hwnd, BOOL fDoubleClick, int x...

Let's say that we did want to support Move in our drag/drop program, for whatever reason. Let's do it with some scratch file instead of clock.avi, though. Create a file somewhere that you don't mind losing; let's say it's C:\throwaway.txt. Change the function OnLButtonDown as follows: void OnLButtonDown(HWND hwnd, BOOL fDoubleClick, ...

The shell gives you the IDataObject; all you have to do is drag it around.

I've seen some confusion over the difference between the function and the function. returns the virtual key state. In other words, reports the state of the keyboard based on the messages you have retrieved from your input queue. This is not the same as the physical keyboard state: When should you use and when should you use ? For ...

Here's a tiny little program: #include <windows.h> #include <shellapi.h> int __cdecl main(int argc, char **argv) { if (argc == 3) { SHELLEXECUTEINFO sei = { sizeof(sei) }; sei.fMask = SEE_MASK_FLAG_DDEWAIT; sei.nShow = SW_SHOWNORMAL; // added 27 Nov sei.lpVerb = argv[1]; sei.lpFile = argv[2]; ShellExecuteEx...

Some people are offended by the special folders like "My Pictures" and "My Music" and delete them, only to find them being re-created. What's going on? Windows itself is okay with you deleting those folders. Some corporations, for example, remove those folders from their employees' machines because they don't want the employees looking at picture...

There are several variations on the SendMessage function, but some are special cases of others. The simplest version is SendMessage itself, which sends a message and waits indefinitely for the response. The next level up is SendMessageTimeout which sends a message and waits for the response or until a certain amount of time has elapsed. Send...

Warning: .NET content ahead. For some reason, this gets asked a lot. To break an integer into its component bytes, you can use the BitConverter.GetBytes method: int i = 123456; byte[] bytes = BitConverter.GetBytes(i); After this code fragment, the byte array contains { 0x40, 0xE2, 0x01, 0x00 }. Update 11am: The endian-ness of th...

Next time you find yourself debugging in assembly language (which for some of us is the only way we debug), here are some machine code tricks you may wish to try out: 90 This is the single-byte NOP opcode. If you want to patch out code and don't want to think about it, just whack some 90's over it. To undo it, you have to patch the or...

If you're writing a static library, you may have need to access the HINSTANCE of the module that you have been linked into. You could require that the module that links you in pass the HINSTANCE to a special initialization function, but odds are that people will forget to do this. If you are using a Microsoft linker, you can take advantage of a ...