Virtual webcam is typically a software only implementation that application discover as if it is a device with physical representation. The mentioned applications use APIs to work with web cameras and ability to extend the APIs and add your own video source is the way to create a virtual web camera. In Windows there are … Read more
x86 does not require alignment for a lock cmpxchg instruction to be atomic. However, alignment is necessary for good performance. This should be no surprise, backward compatibility means that software written with a manual from 14 years ago will still run on today’s processors. Modern CPUs even have a performance counter specifically for split-lock detection … Read more
Having a working knowledge of how Win32 works at the lowest level will certainly be invaluable if you are planning on doing Windows development in the future. It gives you a level of insight into things like Windows, Messaging and GDI that are hidden by the time you get to the level of .NET. I … Read more
Are those above all correct? Yes, if you don’t assume the existence of characters not encoded in Unicode (for most practical applications, this assumption is fine). Do the Windows “A” functions (like SetWindowTextA) take in ASCII strings? Or “multi-byte strings” (more questions on this below)? They take byte strings (i.e., strings whose code unit is … Read more
See http://support.microsoft.com/kb/99115, “INFO: Preventing the Console Window from Disappearing”. The idea is to use GetConsoleScreenBufferInfo to determine that the cursor has not moved from the initial 0,0 position. Code sample from @tomlogic, based on the referenced Knowledge Base article: // call in main() before printing to stdout // returns TRUE if program is in its … Read more
Alright, this is kind of disappointing I’m sure, but you fundamentally cannot do this with 100% reliability. Windows assumes that the active window is the one getting keyboard input. The proper way to fake keyboard input is with SendInput, and you’ll notice that it sends messages to the active window only. That being said, you … Read more
Edit 2. There is even a better way for doing fullscreen, the chromium way, source taken from here: http://src.chromium.org/viewvc/chrome/trunk/src/ui/views/win/fullscreen_handler.cc?revision=HEAD&view=markup void FullscreenHandler::SetFullscreenImpl(bool fullscreen, bool for_metro) { ScopedFullscreenVisibility visibility(hwnd_); // Save current window state if not already fullscreen. if (!fullscreen_) { // Save current window information. We force the window into restored mode // before going fullscreen … Read more
Just in case anyone else runs across this question and is looking for a code sample, I had to do this recently for a Python library project I’m working on. Here’s the test/sample code I came up with: #include <stdio.h> #include <windows.h> #include <tlhelp32.h> int main(int argc, char *argv[]) { int pid = -1; HANDLE … Read more
Windows 10 has thin invisible borders on left, right, and bottom, it is used to grip the mouse for resizing. The borders might look like this: 7,0,7,7 (left, top, right, bottom) When you call SetWindowPos to put the window at this coordinates: 0, 0, 1280, 1024 The window will pick those exact coordinates, and GetWindowRect … Read more
Well, since this post failed badly, I had to dig into the matter myself. Also check out the other answers and comments for additional info regarding other versions etc. EDIT: Since I posted this Q there seems to be ready-built binaries made available from the curl homepage. Check out James’ answer. So here goes: – … Read more