getmessage

主要内容：该篇文章主要描述在WINDOWS应用程序中，消息从产生到被处理的完整流程，此处以界面某一个控件被点击的整体流程为例，说明消息的流动及处理过程（此处消息属于输入消息） 整体过程分析 1. 鼠标点击，产生单击事件，鼠标设备驱动程序根据用户事件，转换成消息，并放置于WINDOWS的系统队列中 2. WINDOWS将系统队列中的消息取出，并投掷于消息对应的应用程序所属的线程队列。 3. 每个应用程序在创建时，系统都会为其创建一个消息队列，发送给应用程序的消息都存放在该消息队列中，等待被处理。 而应用程序的消息引擎 MSG msg; while(GetMessage(msg, NULL, NULL, NULL)) { TranslateMessage(&msg); DispatchMessage(&msg); } 会不停的从自己的专属消息队列中获取消息，并进行消息的翻译和转发（TranslateMessage和DiapatchMessage） GetMessage:从线程队列中取消息，取出后对应的消息会从队列中删除；若无消息，则阻塞 TranslateMessage: 把键盘消息转换成对应的ASCII字符内存，并重新放置于队列中，等待取出 DispatchMessage: 在注册窗口对象时，有如下代码：及设置对口的消息处理回调函数 WNDCLASS wc; ...... wc

I've got a serious head-scratcher on my hands here. I'm investigating performance issues with a WPF component in our application. Our .net application is very large, and almost entirely in windows forms. As part of a new initiative we rewrote one of our core components with a rich WPF ui. There is a lot of WinForms<-->WPF interop going on with this thing to glue it together, and I suspect that may be somehow related to what I'm seeing. When I profile the slow operation in ANTS profiler, I see a lot of activity occurring inside the function UnsafeNativeMethods.IntGetMessageW. ANTS reports as

I want to detect keypress in C++ and i need to use Windows System Call. So, i did some research and this is what i got using Hooks and Message: #include <Windows.h> #include <iostream> #include <sstream> #include <fstream> #include <ctime> using namespace std; LRESULT CALLBACK LowLevelKeyboardProc(int code, WPARAM wParam, LPARAM lParam) { if (code == HC_ACTION) { switch (wParam) { case WM_KEYDOWN: PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT)lParam; char c = char(MapVirtualKey(p->vkCode, MAPVK_VK_TO_CHAR)); cout << c << endl; } } return CallNextHookEx(NULL, code, wParam, lParam); } int main() {