在 Win32 中使用剪贴板

Question

我使用 Win32API GUI 在 Code::Blocks 中创建了一个小程序，全部用 C++ 编写。我想添加一个按钮来自动复制编辑控件中的文本，你是怎么做到的？

（请注意，我是 Win32API 的新手）

Answer 1

需要通过OpenClipboard, and then call SetClipboardData关联编辑控件才能设置剪贴板

这是一个示例：

#include <Windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
#define IDB_ONE 3001
HWND edit;
int WINAPI WinMain(_In_  HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_  LPSTR szCmdLine, _In_  int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("hello windows");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;
    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
    }

    hwnd = CreateWindow(szAppName,
        TEXT("the hello program"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL);
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);
    while (GetMessageW(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
    {
        edit = CreateWindowW(L"edit", L"test", WS_CHILD | WS_VISIBLE | WS_BORDER | ES_MULTILINE | ES_WANTRETURN | ES_NOHIDESEL, 100, 100, 300, 300, hwnd, NULL, NULL, NULL);
        HWND btn = CreateWindowW(L"Button", L"copy", WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON, 500, 150, 50, 50, hwnd, (HMENU)IDB_ONE, NULL, NULL);
        return 0;
    }
    break;
    case WM_COMMAND:
    {
        switch (LOWORD(wParam))
        {
        case IDB_ONE:
            int len = GetWindowTextLengthW(edit);
            TCHAR buf[1024]{};
            size_t memsize = sizeof(wchar_t) * (len + 1);
            GetWindowTextW(edit, (LPWSTR)buf, len + 1);
            HGLOBAL glob = GlobalAlloc(GMEM_MOVEABLE, memsize);
            if (glob != NULL)
            {
                void* mem = GlobalLock(glob);
                if (mem != NULL)
                {
                    memcpy(mem, buf, memsize);
                    GlobalUnlock(glob);
                    HANDLE handle = NULL;

                    if (OpenClipboard(edit))
                    {
                        EmptyClipboard();
                        handle = SetClipboardData(CF_UNICODETEXT, glob);
                    }
                }
            }
        }

    }
    break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);
}

对我有用：

在 Win32 中使用剪贴板

Using the Clipboard in Win32

c++

clipboard

winapi

codeblocks