The documentation for SendMessageCallback tells you, why your callback will not ever be called: If the target window belongs to a different thread from the caller, then the callback function is called only when the thread that called SendMessageCallback also calls GetMessage, PeekMessage, or WaitMessage. The target window obviously belongs to a different thread, because … Read more
QT is a cross platform framework and takes care of hiding away things like WinMain and WindowProcs and instead provides a platform neutral abstraction. Fortunately OpenGL is directly supported by QT – and they even have a page showing how to integrate OpenGL with QT here: QT GUI OpenGL Window solved Using winapi and opengl … Read more
You didn’t post any minimal compiling code we can help you debug, so, everything I’m about to say are guesses based on other questions I’ve seen on this topic: make sure asd is declared static, CreateThread is a C function and knows nothing about class methods make sure asd is declared __stdcall, having wrong calling … Read more
To detect a button press in another process, you have to hook that process. You have four choices for doing that: use SetWindowsHookEx() to install a WH_CALLWNDPROC or WH_GETMESSAGE hook into the target process to catch the WM_COMMAND/BN_CLICKED message that is sent to the button’s parent window when the button is clicked. The message identifies … Read more
How can I give the CreateWindowW function multiple strings for multiple checkboxes? CreateWindow() can only create 1 window/control per call. You will have to manually split up the strings and then call CreateWindow() separately for each individual checkbox. Assuming your vector<string> contains the checkbox strings, you can pass the vector to your window via the … Read more
this is caused because you need to link the library libgdi32.a, if you are using the DevC++, click in Tools->Compiler Options, when open the window, check the box “Add these commands to the linker command line” and in the below textbox add the text: -lgdi32 you form need to be like this: 3 solved My … Read more
Introduction If you have been writing C++ programs and have noticed that they won’t compile after you close the source and open it again, you are not alone. This is a common issue that many C++ programmers face. Fortunately, there are a few steps you can take to troubleshoot and resolve the issue. In this … Read more
if you write in header file static PFNGLGETERRORPROC glGetError; every c/cpp have own private copy of glGetError and it not conflict with other because it static – so different cpp files use different versions of glGetError – in one cpp unit you init one version and it !=0, when you enter to another cpp unit … Read more
There are several problems with your code: ProcessThread() is declared all wrong for CreateThread(), and the compiler would normally scream at you for that, but you are using an erroneous type-cast to quiet the compiler instead of fixing the error. As such, ProcessThread() will not be able to receive the vector correctly at runtime. The … Read more
I think you miss some important requirements for a windows service.According to the MSDN. You need a service main function and a control handler function as you can’t handle the “start” command if there’s no control handler function registered. So you can refer to the code to know how to wrote a ServiceMain Function and … Read more
You can use WINAPI SendMessage with WM_CLOSE for the Msg parameter. Here more about this function: SendMessage solved How to add event to exit a window?
To quote the gcc manual: If no init section is available, when GCC compiles any function called main (or more accurately, any function designated as a program entry point by the language front end calling expand_main_function), it inserts a procedure call to __main as the first executable code after the function prologue. The __main function … Read more
This isn’t possible in general. If you tried it, it might fail in subtle and unpredictable ways. Here are a few potential problems: The process might store its process ID and thread IDs. When you restore it, there is no good way to ensure it gets the same IDs. The process might have files locked. … Read more
If you just want to open an existing image using defualt app then use ShellExectue API. For example: ShellExecuteW(NULL, L”open”, L”Z:\\cat.PNG”, NULL, NULL, SW_SHOW); You could also open image with mspaint using the same API: ShellExecuteW(NULL, L”open”, L”C:\\Windows\\system32\\mspaint.exe”, L”Z:\\cat.PNG”, NULL, SW_SHOW); ShellExecuteEx will let you wait for finishing process. You can do the same using … Read more
From the documentation: The LoadCursor function loads the cursor resource only if it has not been loaded; otherwise, it retrieves the handle to the existing resource. solved Windows LoadCursor – Does it return the same HCURSOR value each time?