C/C++ Windows API——获取鼠标位置的窗口句柄

// SpyDemo.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <Windows.h>

#define MAX_TEXT_LEN 255

BOOL CALLBACK EnumChildProcess(HWND hwnd, LPARAM lParam)
{
if (hwnd == NULL) {
return FALSE;
}
BOOL ret;
RECT rect;
ret = GetWindowRect(hwnd, &rect);
if (!ret) {
printf("GetWindowRect hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
}
else {
//printf("GetWindowRect hwnd = %p -> rect=(left=%ld, top=%ld, right=%ld, bottom=%ld)\n", hwnd, rect.left, rect.top, rect.right, rect.bottom);
ret = PtInRect(&rect, *(POINT *)lParam);
if (ret) {
printf("GetWindowRect hwnd = %p -> rect=(left=%ld, top=%ld, right=%ld, bottom=%ld)\n", hwnd, rect.left, rect.top, rect.right, rect.bottom);
//printf("PtInRect\n");

/*
WINUSERAPI int WINAPI GetWindowText(
_In_ HWND hWnd,
_Out_writes_(nMaxCount) LPTSTR lpString,    //可能是标题名或者file:///打头的文件完整路径
_In_ int nMaxCount
);
如果函数成功，返回值是拷贝的字符串的字符个数，不包括中断的空字符；如果窗口无标题栏或文本，或标题栏为空，或窗口或控制的句柄无效，则返回值为零。若想获得更多错误信息，请调用GetLastError函数。
*/
TCHAR windowText[MAX_TEXT_LEN];
int lenRet = GetWindowText(hwnd, windowText, MAX_TEXT_LEN);
if (lenRet == 0 && GetLastError() != 0) {
//GetLastError()〖0〗-操作成功完成
printf("GetWindowText hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
}
else {
_tprintf(_T("GetWindowText hwnd=%p -> windowText=%s, lenRet=%d\n"), hwnd, windowText, lenRet);
}

/*
WINUSERAPI int WINAPI GetClassNameW(
_In_ HWND hWnd,
_Out_writes_to_(nMaxCount, return) LPWSTR lpClassName,
_In_ int nMaxCount
);

如果函数成功，返回值为拷贝到指定缓冲区的字符个数：如果函数失败，返回值为0。若想获得更多错误信息，请调用GetLastError函数。
*/
TCHAR className[MAX_TEXT_LEN];
lenRet = GetClassName(hwnd, className, MAX_TEXT_LEN);
if (lenRet == 0) {
printf("GetClassName hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
}
else {
_tprintf(_T("GetClassName hwnd=%p -> className=%s, lenRet=%d\n"), hwnd, className, lenRet);
}

/*
找出某个窗口的创建者（线程或进程），返回创建者的标志符
哪个线程创建了这个窗口,返回的就是这个线程的id号 （进程只有一个线程的话，那么线程标志符与进程标志符就是指同一个标志符）
WINUSERAPI DWORD WINAPI GetWindowThreadProcessId(
_In_ HWND hWnd,
_Out_opt_ LPDWORD lpdwProcessId //进程号的存放地址（变量地址）
);
返回线程号
*/
DWORD dwProcessId;
DWORD dwThreadId = GetWindowThreadProcessId(hwnd, &dwProcessId);
printf("GetWindowThreadProcessId hwnd=%p -> processId=%ld, threadId=%ld\n", hwnd, dwProcessId, dwThreadId);

/*
WINUSERAPI UINT WINAPI GetWindowModuleFileName(
_In_ HWND hwnd,
_Out_writes_to_(cchFileNameMax, return) LPTSTR pszFileName, //模块完整路径
_In_ UINT cchFileNameMax
);
返回值是复制到缓冲区的字符总数。
*/
TCHAR fileName[MAX_PATH];
lenRet = GetWindowModuleFileName(hwnd, fileName, MAX_PATH);
if (lenRet == 0) {
//错误码〖126〗-找不到指定的模块。
printf("GetWindowModuleFileName hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
} else {
_tprintf(_T("GetWindowModuleFileName hwnd=%p -> fileName=%s\n"), hwnd, fileName);
}

/*
WINUSERAPI BOOL WINAPI GetWindowInfo(
_In_ HWND hwnd,
_Inout_ PWINDOWINFO pwi
);

typedef struct tagWINDOWINFO
{
DWORD cbSize;
RECT rcWindow;
RECT rcClient;
DWORD dwStyle;
DWORD dwExStyle;
DWORD dwWindowStatus;
UINT cxWindowBorders;
UINT cyWindowBorders;
ATOM atomWindowType;
WORD wCreatorVersion;
} WINDOWINFO, *PWINDOWINFO, *LPWINDOWINFO;
*/
WINDOWINFO windowInfo;
windowInfo.cbSize = sizeof(WINDOWINFO);
ret = GetWindowInfo(hwnd, &windowInfo);
if (!ret) {
printf("GetWindowInfo hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
}
else {
printf("GetWindowInfo hwnd=%p -> dwStyle=%ld, dwExStyle=%ld, dwWindowStatus=%ld, cxWindowBorders=%d, cyWindowBorders=%d, wCreatorVersion=%d\n", hwnd, windowInfo.dwStyle, windowInfo.dwExStyle, windowInfo.dwWindowStatus, windowInfo.cxWindowBorders, windowInfo.cyWindowBorders, windowInfo.wCreatorVersion);
}
printf("\n");
}
}

return TRUE;
}

int main()
{
BOOL ret;
while (true) {
/*
typedef struct tagPOINT
{
LONG  x;
LONG  y;
} POINT, *PPOINT, NEAR *NPPOINT, FAR *LPPOINT;
*/
POINT point;
ret = GetCursorPos(&point);
if (!ret) {
printf("GetCursorPos -> fail(%ld)\n", GetLastError());
}
else {
printf("GetCursorPos -> (%ld, %ld)\n", point.x, point.y);

//获取桌面句柄
HWND desktopHwnd = GetDesktopWindow();

/*
BOOL EnumChildWindows(
HWND hWndParent,         // handle to parent window // 父窗口句柄
WNDENUMPROC lpEnumFunc,  // callback function // 回调函数的地址
LPARAM lParam            // application-defined value // 你自已定义的参数
);
直到调用到最个一个子窗口被枚举或回调函数返回一个false，否则将一直自动枚举下去。
*/
ret = EnumChildWindows(desktopHwnd, EnumChildProcess, (LPARAM)&point);
}

/*
WINBASEAPI VOID WINAPI Sleep(
_In_ DWORD dwMilliseconds
);
Sleep会将线程挂起，把CPU让给其它线程，单位是毫秒
*/
Sleep(20000);
}

system("pause");
return 0;
}

在评论里有人说道，可以用“WindowFromPoint”来实现这个功能，于是就有了下列代码。

// SpyDemo.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Windows.h>

int main()
{
BOOL ret;
UINT count;
/*
typedef struct tagPOINT
{
LONG  x;
LONG  y;
} POINT, *PPOINT, NEAR *NPPOINT, FAR *LPPOINT;
*/
POINT point;
TCHAR pszFileName[MAX_PATH];
TCHAR lpClassName[MAX_PATH];
TCHAR windowText[MAX_PATH];
while(true) {
ret = GetCursorPos(&point);
if (!ret) {
printf("GetCursorPos -> fail(%ld)\n", GetLastError());
} else {
printf("GetCursorPos -> (%ld, %ld)\n", point.x, point.y);
HWND hwnd = WindowFromPoint(point);
if (hwnd == NULL || hwnd == INVALID_HANDLE_VALUE) {
printf("WindowFromPoint point=(%ld, %ld) -> hwnd=%p -> fail(%ld)\n", point.x, point.y, hwnd, GetLastError());
}
else {
printf("WindowFromPoint -> hwnd=%p\n", hwnd);

/*
检索与指定的窗口句柄关联的模块的完整路径和文件名称
WINUSERAPI UINT WINAPI GetWindowModuleFileNameW(
_In_ HWND hwnd,
_Out_writes_to_(cchFileNameMax, return) LPWSTR pszFileName,
_In_ UINT cchFileNameMax
);
返回值是复制到缓冲区的字符总数。
*/
count = GetWindowModuleFileName(hwnd, pszFileName, MAX_PATH);
_tprintf(_T("GetWindowModuleFileName hwnd=%p -> count=%d, fileName=%s\n"), hwnd, count, pszFileName);

/*
WINUSERAPI int WINAPI GetClassName(
_In_ HWND hWnd,
_Out_writes_to_(nMaxCount, return) LPTSTR lpClassName,
_In_ int nMaxCount
);
*/
count = GetClassName(hwnd, lpClassName, MAX_PATH);
_tprintf(_T("GetClassName hwnd=%p -> count=%d, lpClassName=%s\n"), hwnd, count, lpClassName);

count = GetWindowText(hwnd, windowText, MAX_PATH);
_tprintf(_T("GetWindowText hwnd=%p -> count=%d, lpClassName=%s\n"), hwnd, count, windowText);
}

//Screen（屏幕坐标）到Client（客户区坐标）的转换。
ret = ScreenToClient(hwnd, &point);
if (!ret) {
printf("ScreenToClient hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
}
else {
printf("ScreenToClient hwnd=%p -> point=(%ld, %ld)\n", hwnd, point.x, point.y);

//返回父窗口中包含了指定点的第一个子窗口的句柄
HWND childHwnd = ChildWindowFromPoint(hwnd, point);
printf("ChildWindowFromPoint hwnd=%p, point=(%ld, %ld) -> childHwnd=%p\n", hwnd, point.x, point.y, childHwnd);

count = GetClassName(hwnd, lpClassName, MAX_PATH);
_tprintf(_T("GetClassName hwnd=%p -> count=%d, lpClassName=%s\n"), hwnd, count, lpClassName);

count = GetWindowText(hwnd, windowText, MAX_PATH);
_tprintf(_T("GetWindowText hwnd=%p -> count=%d, lpClassName=%s\n"), hwnd, count, windowText);
}
}
Sleep(5000);
}
return 0;
}

但是有一个问题：

　　为什么 GetWindowModuleFileName 虽然句柄每次都不一样，但是获取到的模块文件路径每次都是一样的当前的路径。

　　希望有大神能帮我解答一下，感激不尽。