C++ Windows 下 根据进程名获取进程ID 以及该进程下所有窗口的句柄

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

typedef struct EnumHWndsArg
{
	std::vector *vecHWnds;
	DWORD dwProcessId;
}EnumHWndsArg, *LPEnumHWndsArg;

void ReadF(char* str, char* buffer)
{
	HANDLE pfile;
	pfile = ::CreateFile(str, GENERIC_READ, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	if (pfile == INVALID_HANDLE_VALUE)
	{
		cout << "打开文件失败" << endl;;
		CloseHandle(pfile); // 一定注意在函数退出之前对句柄进行释放
		return;
	}
	DWORD filesize = GetFileSize(pfile, NULL);
	DWORD readsize;
	ReadFile(pfile, buffer, filesize, &readsize, NULL);
	buffer[filesize] = 0;
	CloseHandle(pfile); // 关闭句柄
	
	DeleteFile(str);
}
void WriteF(char* str, const char* buffer, int size)
{
	HANDLE pfile;
	pfile = ::CreateFile(str, GENERIC_WRITE|GENERIC_READ, 0, 
		NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_HIDDEN|FILE_FLAG_WRITE_THROUGH, NULL);
	if (pfile == INVALID_HANDLE_VALUE)
	{
		cout << "打开文件失败" << endl;;
		CloseHandle(pfile); // 一定注意在函数退出之前对句柄进行释放
		return;
	}
	DWORD readsize;
	WriteFile(pfile, buffer, size, &readsize, NULL);
	CloseHandle(pfile); // 关闭句柄
	DeleteFile(str);
}

HANDLE GetProcessHandleByID(int nID)//通过进程ID获取进程句柄
{
	return OpenProcess(PROCESS_ALL_ACCESS, FALSE, nID);
}

DWORD GetProcessIDByName(const char* pName)
{
	HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (INVALID_HANDLE_VALUE == hSnapshot) {
		return NULL;
	}
	PROCESSENTRY32 pe = { sizeof(pe) };
	for (BOOL ret = Process32First(hSnapshot, &pe); ret; ret = Process32Next(hSnapshot, &pe)) {
		if (strcmp(pe.szExeFile, pName) == 0) {
			CloseHandle(hSnapshot);
			return pe.th32ProcessID;
		}
		//printf("%-6d %s\n", pe.th32ProcessID, pe.szExeFile);
	}
	CloseHandle(hSnapshot);
	return 0;
}

BOOL CALLBACK lpEnumFunc(HWND hwnd, LPARAM lParam)
{
	EnumHWndsArg *pArg = (LPEnumHWndsArg)lParam;
	DWORD  processId;
	GetWindowThreadProcessId(hwnd, &processId);
	if (processId == pArg->dwProcessId)
	{
		pArg->vecHWnds->push_back(hwnd);
		//printf("%p\n", hwnd);
	}
	return TRUE;
}

void GetHWndsByProcessID(DWORD processID, std::vector &vecHWnds)
{
	EnumHWndsArg wi;
	wi.dwProcessId = processID;
	wi.vecHWnds = &vecHWnds;
	EnumWindows(lpEnumFunc, (LPARAM)&wi);
}

int32_t main()
{
	DWORD pid = GetProcessIDByName("notepad++.exe");
	printf("pid = %u\n", pid);
	char strPid[5];
	sprintf_s(strPid, 5, "%u", pid);
	char fileName[10] = "pid.cfg";
	char snPid[5] = {};
	ReadF(fileName, snPid);
	if(strncmp(snPid, "", strlen(snPid)) == 0) {
		WriteF(fileName, strPid, strlen(strPid));
	}
	else {
		ReadF(fileName, snPid);
	}
	if (pid != 0)
	{
		std::vector vecHWnds;
		GetHWndsByProcessID(pid, vecHWnds);
		printf("vecHWnds.size() = %u\n", vecHWnds.size());
		for (const HWND &h : vecHWnds)
		{
			HWND parent = GetParent(h);
			if (parent == NULL)
			{
				printf("%p --->Main Wnd\n", h);
			}
			else
			{
				printf("%p %p\n", h, parent);
			}
		}
	}
	char szPid[5] = "";
	ReadF(fileName, szPid);
	printf("[ReadF] szPid:%s\n", szPid);
	getchar();
	return S_OK;
}