C/C++使用keybd_event模拟键盘按键

#include <stdio.h>
#include <Windows.h>

/*
    设置键盘大小写状态
    big:为TRUE则切换大写状态,否则切换小写状态
*/
VOID MySetKeyBig(BOOL big = FALSE);

/*
    模拟键盘按键，支持大小写
    str:需要按出的字符串
*/
VOID MyAnalogKey(char *str);

int main(void)
{
    // 当程序运行1.5s时再执行模拟按键，以便选择需要操作的窗口
    Sleep(1500);
    MyAnalogKey("Love life,Love BiaoGe.0123456789");
    system("pause");
    return 0;
}

VOID MySetKeyBig(BOOL big)
{
    // 判断键盘CapsLock键是否开启状态,开启状态则为大写,否则为小写
    if (GetKeyState(VK_CAPITAL))
    {
        // 如果当前键盘状态为大写,要求改小写,则模拟按键CapsLock切换状态
        if (!big)
        {
            keybd_event(VK_CAPITAL, NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event(VK_CAPITAL, NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
    }
    else
    {
        // 如果当前键盘状态为小写,要求改大写,则模拟按键CapsLock切换状态
        if (big)
        {
            keybd_event(VK_CAPITAL, NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event(VK_CAPITAL, NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
    }
}

VOID MyAnalogKey(char *str)
{
    int iLen = 0;
    char *tmp = NULL;
    INPUT *keys = NULL;
    BOOL bOldState = FALSE;

    // 保存此操作前的键盘状态
    bOldState = (BOOL)GetKeyState(VK_CAPITAL);
    iLen = lstrlen(str);
    tmp = (char *)malloc(iLen);
    memmove(tmp, str, iLen);
    for (int i = 0; i < iLen; i++)
    {
        // 某些符号非直属键盘按键,这里只过滤转换两个,以后用到其它字符自行添加过滤
        if (tmp[i] == ' ')
        {
            // 产生一个击键消息步骤:按下->抬起
            keybd_event(VK_SPACE, NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event(VK_SPACE, NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
        else if (tmp[i] == ',')
        {
            keybd_event(VK_OEM_COMMA, NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event(VK_OEM_COMMA, NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
        else if (tmp[i] >= 'a' && tmp[i] <= 'z')
        { // 根据字符大小写切换键盘大小写状态
            MySetKeyBig(0);
            // keybd_event只识别大写
            keybd_event((BYTE)tmp[i]-32, NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event((BYTE)tmp[i]-32, NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
        else if ((tmp[i] >= 'A' && tmp[i] <= 'Z') || (tmp[i] >= '0' && tmp[i] <= '9'))
        {
            MySetKeyBig(1);
            keybd_event((BYTE)tmp[i], NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event((BYTE)tmp[i], NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
        else
        {
            keybd_event((BYTE)tmp[i]+64, NULL, KEYEVENTF_EXTENDEDKEY | 0, NULL);
            keybd_event((BYTE)tmp[i]+64, NULL, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, NULL);
        }
    }
    // 恢复此操作之前的键盘状态
    MySetKeyBig(bOldState);
    free(tmp);
}