求助_scanf输入

#define _CRT_SECURE_NO_WARNINGS 1
#pragma warning(disable:6031)

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>

int main(void) {
    //复制内容...
    HWND qqhd;
    char ch[1024]={0};
    printf("输入并打开QQ窗口（名）：");
    scanf("%s",&ch[1024]);
    qqhd=FindWindow(NULL,ch);
    int i = 10;
    while (i != 0) {
        SendMessageA(qqhd, WM_PASTE,0 ,0 );
        SendMessageA(qqhd, WM_KEYDOWN, VK_RETURN, 0);
        i-=1;
        Sleep(50);
    }
   
    return 0;
}