c++ - 如何使用sendinput函数C++

Question

虽然看到msdn的sendinput函数，我也不知道输入了什么参数。

UINT WINAPI SendInput(
_In_ UINT nInputs,
_In_ LPINPUT pInputs,
_In_ int cbSize
);

以上参数是什么意思，我需要为它们创建什么？此外，键入，ki.wScan，ki.time，ki.dwExtraInfo，ki.wVk，ki.dwFlags上面的对象是什么意思，还有其他可能经常使用的对象吗？

Answer 1

UINT 是无符号整数类型。 _In_ 表示参数是您发送到函数中的输入 参数。这与 output 参数相反，该参数将是您发送的内容，函数将填充。

LPINPUT结构定义如下:

typedef struct tagINPUT {
    DWORD   type;

    union
    {
        MOUSEINPUT      mi;
        KEYBDINPUT      ki;
        HARDWAREINPUT   hi;
    };
} INPUT, *PINPUT, FAR* LPINPUT;

所以它看起来像一个 DWORD 加上一些其他结构的 union 。引用 WinUser.h了解更多。

DWORD 是 32 位无符号整数 (source):

A DWORD is a 32-bit unsigned integer (range: 0 through 4294967295 decimal). Because a DWORD is unsigned, its first bit (Most Significant Bit (MSB)) is not reserved for signing. This type is declared as follows: typedef unsigned long DWORD, *PDWORD, *LPDWORD;

鼠标输入

typedef struct tagMOUSEINPUT {
    LONG    dx;
    LONG    dy;
    DWORD   mouseData;
    DWORD   dwFlags;
    DWORD   time;
    ULONG_PTR dwExtraInfo;
} MOUSEINPUT, *PMOUSEINPUT, FAR* LPMOUSEINPUT;

KEYBDINPUT

typedef struct tagKEYBDINPUT {
    WORD    wVk;
    WORD    wScan;
    DWORD   dwFlags;
    DWORD   time;
    ULONG_PTR dwExtraInfo;
} KEYBDINPUT, *PKEYBDINPUT, FAR* LPKEYBDINPUT;

硬件输入

typedef struct tagHARDWAREINPUT {
    DWORD   uMsg;
    WORD    wParamL;
    WORD    wParamH;
} HARDWAREINPUT, *PHARDWAREINPUT, FAR* LPHARDWAREINPUT;

WORD、LONG、ULONG 和 ULONG_PTR 在 MSDN page 上都有明确定义(见右栏)

这是一个使用 SendInput 的示例，可以通过谷歌搜索 (Source) 轻松找到:

//
// keystroke.c - Pauses, then simulates a key press
// and release of the "A" key.
//
// Written by Ted Burke - last updated 17-4-2012
//
// To compile with MinGW:
//
//      gcc -o keystroke.exe keystroke.c
//
// To run the program:
//
//      keystroke.exe
//
// ...then switch to e.g. a Notepad window and wait
// 5 seconds for the A key to be magically pressed.
//

// Because the SendInput function is only supported in
// Windows 2000 and later, WINVER needs to be set as
// follows so that SendInput gets defined when windows.h
// is included below.
#define WINVER 0x0500
#include <windows.h>

int main()
{
    // This structure will be used to create the keyboard
    // input event.
    INPUT ip;

    // Pause for 5 seconds.
    Sleep(5000);

    // Set up a generic keyboard event.
    ip.type = INPUT_KEYBOARD;
    ip.ki.wScan = 0; // hardware scan code for key
    ip.ki.time = 0;
    ip.ki.dwExtraInfo = 0;

    // Press the "A" key
    ip.ki.wVk = 0x41; // virtual-key code for the "a" key
    ip.ki.dwFlags = 0; // 0 for key press
    SendInput(1, &ip, sizeof(INPUT));

    // Release the "A" key
    ip.ki.dwFlags = KEYEVENTF_KEYUP; // KEYEVENTF_KEYUP for key release
    SendInput(1, &ip, sizeof(INPUT));

    // Exit normally
    return 0;
}

你问题的另一部分:

Also, type, ki.wScan, ki.time, ki.dwExtraInfo, ki.wVk, ki.dwFlags What do objects above mean

我相信您指的是 MSDN page 中的这段代码:

// IMPORTANT: Current keyboard layout 0xf0010413 (Netherland with USA kbd)!!!!!!!
WORD vkCode = 0x36; // '6'
INPUT keyEvent = {0};
keyEvent.type = INPUT_KEYBOARD;
keyEvent.ki.wVk = vkCode;
keyEvent.ki.wScan = MapVirtualKeyEx(vkCode, 0, (HKL)0xf0010413);
SendInput(1, &keyEvent, sizeof(keyEvent));

该代码是由页面上的另一个用户发布的；它不是文档的一部分。用户只需创建一个名为 keyEvent 的 LPINPUT 结构，然后访问该结构的 KEYBDEVENT 部分:

KEYBDINPUT      ki;