Hi, What is the best way to send a float in a windows message using c++ casting operators? The reason I ask is that the approach which first occurred to me did not work. For the record I'm using the standard win32 function to send messages: PostWindowMessage(UINT nMsg, WPARAM wParam, LPARAM lParam) What does not work: Using stat...
Hi, I am writing some kind of IPC functionality and need to pass certain resources from one process to another. This works well for Pipe handles etc. which can be duplicated via DuplicateHandle. Now I need to pass a HDC from one process to the other. Is this even possible? If yes: how? Sub-Question: I am assuming passing window handles...
Using the C/C++ Windows API RegisterWindowMessage() I am using the name of the application as the message name. Next I call CreatMutex() using the same name so that I can tell if it already exists. If it does, I know this application is already running and not to launch a second instance of it. THis is the operation of my function Runn...
I have a main form and non-modal autocomplete form. How can I prevent the autocomplete form from being activated by the user, when the user clicks on the list in the autocomplete form? So, basically I want the autocomplete form the receive the mouse click message when the users clicks, but to never become active, because it causes probl...
Are there any tutorials or guides out there that anyone knows of that will show me how to read forms from an external program and get back information about the controls on the form? Currently, I can get the handle to the form, and I can get the class name, but I need to get more information such as a persistent name and contained data....
My application is a rather well behaved Windows citizen, so when I ported it to Windows Vista/7 I replaced my custom file format association code with support for the Default Programs API. However I ran into a problem when trying to make uninstaller for my application - there seems to be no way to remove file format associations via Defa...
In attempting to use std::select1st from <functional> in a VS2008 project I found that it was ifdef'd out by a _HAS_TRADITIONAL_STL guard. Is there a reason for this? Is it safe to simply define _HAS_TRADITIONAL_STL before including <functional>? ...
Im writing a WPF application that wants to get access to a digital camera, and have been madly Googling around for solutions and Im pretty happy with how its all going. This is what I have at the moment: private const decimal WM_DEVICECHANGE = 0x0219; private const int DBT_DEVTYP_HANDLE = 6; private const int DBT_DEVNODES_C...
How can I effectively trace the raw data sent to my socket server listening on a win32 machine? I want the trace to be specific to the port my server is listening on, so I can monitor only that traffic. I want to see how the data exchange works on the wire. ...
Hi, i have uptill now worked on linux where its very easy to install opensource libraries using simple configure;make;make install commands.. now i need to use MSVC++ to run some opengl code that includes the standard opengl headers.. but defaultly they arent present.. i downloaded the tar file from freeglut site,it has VisualStudio20...
I used SPY++ to hook my windows message, but there is no WM_SYSCOMMAND message was sent when I pressed "Windows+D". What message will be sent by Windows when you press "Windows+D"? Thnaks in advance. ...
Hi All, I am writing an application in which I got to lock the computer screen (OS is Windows). My Application is in C++. For this purpose I used the LockWorkStation() API defined on msdn, http://msdn.microsoft.com/en-us/library/aa376875%28VS.85%29.aspx I have included windows.h as told but still I am getting compilation error: .\sour...
My C++ windows program uses htmlhelp. Structure HH_POPUP includes field pszFont in format: "Facename[, point size[, CHARSET[, color[, PLAIN BOLD ITALIC UNDERLINE]]]]", but I cannot find any info about way to define the charset. My russian popup help is totally unreadeable. HH_POPUP popupAttr; memset(&popupAttr, 0, sizeof(popupAttr)); po...
I know that memory usage is a very complex issue on Windows. I am trying to write a UI control for a large application that shows a 'percentage of memory used' number, in order to give the user an indication that it may be time to clear up some memory, or more likely restart the application. One implementation used ullAvailVirtual fr...
Hello everyone :) I'm trying to speedup directory enumeration in C++, where I'm recursing into subdirectories. I currently have an app which spends 95% of it's time in FindFirst/FindNextFile APIs, and it takes several minutes to enumerate all the files on a given volume. I know it's possible to do this faster because there is an app tha...
When asynchronous I/O (or "overlapped" I/O in Win32 jargon) is used, we need to deal with the OVERLAPPED structure and his hEvent member. If the I/O function will delay the read or write operation, we will get an ERROR_IO_PENDING error code, then we will wait the asynchronous operation to complete with a WaitForXxxEvent function, then we...
The documentation for WinHttpReadData says, regarding HTTP's chunked transfer coding: Starting in Windows Vista and Windows Server 2008, WinHttp enables applications to perform chunked transfer encoding on data sent to the server. When the Transfer-Encoding header is present on the WinHttp response, WinHttpReadData strips the chunki...
Hey guys, this is my first post. I'm just getting started with win32 API programming in C++ and I'm having trouble compiling the winnie tutorial (http://www.relisoft.com/win32/winnie.html) with MinGW. My input and output: C:\Users\Eric\Projects> g++ winnie.cpp -o winnie.exe /mingw/lib/libmingw32.a(main.o):main.c:(.text+0xd2): undefin...
Windows resources have a FileVersion and a ProductVersion. In native development environment(eg. Win32 app, device driver) How do you manage the ProductVerion automatically? My language is c/c++. And I use Visual Studio 2008. I want to increase the version automatically when I build my projects. Is it possible? I guess there is a sim...
I am currently evaluating a few of scalable memory allocators, namely nedmalloc and ptmalloc (both built on top of dlmalloc), as a replacement for default malloc / new because of significant contention seen in multithreaded environment. Their published performance seems to be good, however I would like to check what are experiences of ot...