C++添加开机自启动的代码

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

int main() {
	char regname[] = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run";
	TCHAR path[] = "C:\\Windows\\System32\\door.exe";
	HKEY hKey;
	int ret;
	ret = RegOpenKey(HKEY_LOCAL_MACHINE, regname, &hKey);
	ret = RegSetValueEx(hKey, "door", 0, REG_EXPAND_SZ, (unsigned char *)path, strlen(path));
	if (ret == ERROR_SUCCESS)
	{
		printf("success to write run key\n");
		RegCloseKey(hKey);
	}
	else
	{
		printf("fail to set value. %d\n", ret);
		system("pause");
		return 0;
	}

	char modlepath[256];
	char syspath[256];
	GetModuleFileName(NULL, modlepath, 256);
	//printf("%s\n", modlepath);
	GetSystemDirectory(syspath, 256);
	//printf("syspath：%s\n", syspath);

	ret = CopyFile(modlepath, strcat(syspath, "\\door.exe"), 1);
	if (true)
	{
		printf("%s has been copy to %s", modlepath, syspath);
	}
	else
	{
		printf("the file is exist");
	}
	//system("pause");
	return 0;
}