win32-EnumChildWindows的使用

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

static BOOL CALLBACK enumchildWindowCallback(HWND hWnd, LPARAM lparam) {
    int length = GetWindowTextLength(hWnd);
    char * buffer = new char[length + 1];
    GetWindowText(hWnd, buffer, length + 1);
    std::string windowTitle(buffer);

    std::cout << hWnd << ":  " << windowTitle << std::endl;

    return TRUE;
}

int main()
{
    HWND hwnd = (HWND)0x000D0DEE; //父窗口的句柄
    EnumChildWindows(hwnd, enumchildWindowCallback, NULL);

    std::cin.ignore();
    return 0;
}

拓展： 使用EnumWindows枚举窗口句柄（不包括子窗口）

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

static BOOL CALLBACK enumchildWindowCallback(HWND hWnd, LPARAM lparam) {
int length = GetWindowTextLength(hWnd);
char* buffer = new char[length + 1];
GetWindowText(hWnd, buffer, length + 1);
std::string windowTitle(buffer);

int n = (int)hWnd;
// Ignore windows if invisible or missing a title
//    if (IsWindowVisible(hWnd) && length != 0) {
std::cout << n << ": " << windowTitle << std::endl;
//    }
return TRUE;
}

static BOOL CALLBACK enumWindowCallback(HWND hWnd, LPARAM m) {
TCHAR _classbuf[255];
int length = GetWindowTextLength(hWnd);
char* buffer = new char[length + 1];
GetWindowText(hWnd, buffer, length + 1);
std::string windowTitle(buffer);
m = GetClassName(hWnd, _classbuf, 1024);
int n = (int)hWnd;
// Ignore windows if invisible or missing a title
//    if (IsWindowVisible(hWnd) && length != 0) {
std::cout << n << ": " << windowTitle << std::endl;
//    EnumChildWindows(hWnd, enumWindowCallback, m);
//    }
return TRUE;
}

int main()
{
std::cout << "Enmumerating windows..." << std::endl;
EnumWindows(enumWindowCallback, NULL);

std::cin.ignore();
return 0;

}

如果去掉EnumChildWindows(hWnd, enumWindowCallback, m)的注释，将会枚举所有的窗口