为什么WM_KEYDOWN不起作用，为什么WM_KEYUP不起作用? [英] Why WM_KEYUP doesn't work, if WM_KEYDOWN does?

问题描述

WM_KEYUP 不起作用

我尝试将ASCII码从 0x57 更改为 0x005701 ，因为我的朋友说它应该可以，但不能.

I tried change ASCII code from 0x57 to 0x005701, because my friend says it should work, but it doesn't.

#include <iostream>
#include <windows.h>

using namespace std;

int KEY_DOWN = 0x57;

int main()
{
    HWND hwnd;
    if (!(hwnd = FindWindow(L"AAAA", NULL))) {
        cout << "Couldn't find window";
    }
    else {
        Sleep(5000);
        PostMessage(hwnd, WM_SETFOCUS, NULL, NULL);
        PostMessage(hwnd, WM_KEYDOWN, KEY_DOWN, NULL);
    }
}

我想制作将 WM_KEYDOWN 和 WM_KEYUP 发送到带有 PostMessage 或 SendMessage 的应用程序的应用程序，但是 WM_KEYUP 不起作用

I want to make application that will send WM_KEYDOWN, and WM_KEYUP to application with PostMessage or SendMessage but WM_KEYUP doesn't work

推荐答案

正如@David Heffernan所说，

As @David Heffernan said that, SendInput can do this.

这是最少的代码.

#include <iostream>
#include <Windows.h>

using namespace std;

int main()
{
    HWND hwnd;
    INPUT input[2];
    memset(input, 0, sizeof(input));
    if (!(hwnd = FindWindow(L"AAAA", NULL)))
    {
        cout << "Couldn't find window";
    }
    else
    {
        Sleep(5000);
        input[0].type = input[1].type = INPUT_KEYBOARD;

        SetForegroundWindow(hwnd);

        input[0].ki.wVk = 'W';
        input[0].ki.dwFlags = 0;
        input[1].ki.wVk = 'W';
        input[1].ki.dwFlags = KEYEVENTF_KEYUP;
        SendInput(2, input, sizeof(INPUT));
    }

    return 0;
}

将按键按下和按键按下事件放到长度为2的数组中，并将它们作为单个原子单元.

Put the key down and key up events into an array of length 2 and send them as a single atomic unit.

设置 ki.dwFlags 的值可控制键的向上和向下状态.

Set the value of ki.dwFlags to control up and down states of the key.

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