几周前这里有人帮助我编写了一个枚举所有主窗口的类。
今天我试图修改那个类以枚举特定父窗口的所有子窗口。
这是头文件:
#include "TChar.h"
#include "string.h"
#include "windows.h"
#include "Winuser.h"
#include <string>
#include <vector>
using namespace std;
typedef std::basic_string<TCHAR> tstring; //define basic_string<TCHAR> as a member of the std namespace
//and at the same time use typedef to define the synonym tstring for it
class Handles {
public:
struct child_data
{
tstring caption;
HWND handle;
};
private:
std::vector<child_data> stuff; //define a vector of objecttype "child_data" (the struct defined above) named stuff
BOOL add_window(HWND hwnd)
{
TCHAR String[200] = {0};
if (!hwnd)
return TRUE; // Not a window, return TRUE to Enumwindows in order to get the next handle
if (!::IsWindowVisible(hwnd))
return TRUE; // Not visible, return TRUE to Enumwindows in order to get the next handle
LRESULT result = SendMessageW(hwnd, WM_GETTEXT, sizeof(String), (LPARAM)String); //result stores the number of characters copied from the window
if (!result)
return TRUE; // No window title, return TRUE to Enumwindows in order to get the next handle
child_data data; // define an object of type child_data called data
data.handle = hwnd; //copy the handle to the data.handle member
for(int i = 0; i < result; i++) //copy each character to data.caption by using push_back
data.caption.push_back(String[i]);
stuff.push_back(data); //Put the whole data (with its members data.caption and data.handel) struct in the vector "stuff" using pushback
return TRUE;
}
static BOOL CALLBACK EnumChildWindows(HWND hwnd, LPARAM lParam)
{
Handles* ptr = reinterpret_cast<Handles*>(lParam);
return ptr->add_window(hwnd);
}
public:
Handles& enum_windows()
{
stuff.clear(); //clean up
if(!EnumWindows(EnumChildWindows, reinterpret_cast<LPARAM>(this)))
{
// Error! Call GetLastError();
}
return *this;
}
std::vector<child_data>& get_results()
{
return stuff;
}
};
我通过以下方式调用该函数:
std::vector<Handles::child_data> windows = Handles().enum_windows().get_results(); //Enumerate all visible windows and store handle and caption in "windows"
问题是:
我不太确定如何将父窗口的句柄传递给 header 中的回调函数。感觉我已经尝试了所有方法,但我总是以此类错误告终:变量 hwnd 未在 ... 中声明。
问题是我 100% 不懂这门课。我弄清楚的事情都有评论。
感谢您的帮助!
最佳答案
而不是调用 EnumWindows
, 它枚举了屏幕上的所有顶级窗口,你可以调用 EnumChildWindows
枚举给定父窗口的子窗口。为此,您可以将 enum_windows
的重载添加到您的 Handles
类:
Handles& enum_windows(HWND hParentWnd)
{
stuff.clear(); //clean up
EnumChildWindows(hParentWnd, Handles_WndEnumProc, reinterpret_cast<LPARAM>(this));
return *this;
}
EnumChildWindows
是 WNDENUMPROC
的错误名称。我建议将其重命名为更独特的名称,例如 Handles_WndEnumProc
。
关于c++ - 枚举子窗口,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4843772/