Attachment 169641 Details for Bug 116983 – ClipboardTest.cpp code that provokes the problem

ClipboardTest.cpp code that provokes the problem

ClipboardTest.cpp (text/plain), 3.00 KB, created by jasonkres on 2021-02-10 04:01:38 UTC

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Creator: jasonkres

Created: 2021-02-10 04:01:38 UTC

Size: 3.00 KB

patch

obsolete

>// ClipboardTest.cpp
>//
>
>#ifndef UNICODE
>#define UNICODE
>#endif 
>
>#include <windows.h>
>#include <iostream>
>
>LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
>
>int main()
>{
>    std::cout << "Process ID = " << GetCurrentProcessId() << std::endl;
>
>    WNDCLASS wc = {};
>    wc.lpfnWndProc = WindowProc;
>    wc.hInstance = GetModuleHandle(NULL);
>    wc.lpszClassName = TEXT("ClipboardTestClass");
>    if (!RegisterClass(&wc)) {
>        std::cerr << "Could not register window class." << std::endl;
>        return 1;
>    }
>
>    HWND hwnd = CreateWindowEx(0, TEXT("ClipboardTestClass"), TEXT("Clipboard Test Window"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, GetModuleHandle(NULL), NULL);
>    if (hwnd == NULL) {
>        std::cerr << "Could not create window." << std::endl;
>        return 1;
>    }
>    ShowWindow(hwnd, SW_HIDE);
>
>    MSG msg = {};
>    while (GetMessage(&msg, NULL, 0, 0))
>    {
>        TranslateMessage(&msg);
>        DispatchMessage(&msg);
>    }
>
>    return 0;
>}
>
>LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
>{
>    switch (uMsg)
>    {
>        case WM_CREATE:
>            std::cout << "hwnd = " << hwnd << std::endl;
>            if (!AddClipboardFormatListener(hwnd)) {
>                std::cerr << "Could not AddClipboardFormatListener." << std::endl;
>                return -1;
>            }
>            std::cout << "Listening to clipboard..." << std::endl;
>            return 0;
>        case WM_DESTROY:
>            RemoveClipboardFormatListener(hwnd);
>            return 0;
>        case WM_CLIPBOARDUPDATE:
>        {
>            std::cout << "Clipboard update detected." << std::endl;
>
>            while (!OpenClipboard(hwnd)) {
>                DWORD lastError = GetLastError();
>                std::cout << "Could not OpenClipboard, error " << lastError << " GetOpenClipboardWindow = " << GetOpenClipboardWindow() << " Will retry." << std::endl;
>                Sleep(100); // Not production code: retry forever.
>            }
>
>            std::cout << "GetClipboardSequenceNumber = " << GetClipboardSequenceNumber() << std::endl;
>
>            UINT format = 0;
>            while (format = EnumClipboardFormats(format)) {
>                std::cout << "Clipboard format = " << format << std::endl;
>            }
>            DWORD lastErrorEnum = GetLastError();
>            if (lastErrorEnum != ERROR_SUCCESS) {
>                std::cout << "Could not EnumClipboardFormats, error " << lastErrorEnum << std::endl;
>            }
>            std::cout << "Done listing formats." << std::endl;
>
>            // This holds the clipboard open and is more than long enough to provoke the problem in LibreOffice.
>            // Actually, the problem often happens for me even when this sleep is omitted.
>            Sleep(500);
>
>            CloseClipboard();
>            return 0;
>        }
>    }
>    return DefWindowProc(hwnd, uMsg, wParam, lParam);
>}

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Attachments on bug 116983: 141323 | 141324 | 161838 | 163026 | 169641