复制可以，粘贴还没测试。有没有什么问题？

void gui_gdiplus_copy(wchar_t* str, int len)
{
    if(!str || len<1 || !OpenClipboard(NULL))return;

    HGLOBAL mem = (HGLOBAL)GlobalAlloc(GMEM_MOVEABLE, (len + 1) * sizeof(wchar_t));
    if(!mem) {
        CloseClipboard();
        return;
    }

    wchar_t* wstr = (wchar_t*)GlobalLock(mem);
    if(!wstr) {
        GlobalFree(mem);
        CloseClipboard();
        return;
    }

    wcsncpy(wstr, str, len);
    wstr[len] = 0;
    GlobalUnlock(mem);
    if (!SetClipboardData(CF_UNICODETEXT, mem))
        GlobalFree(mem);
    CloseClipboard();
}

void gui_gdiplus_paste(wchar_t* str, int len)
{
    if(len<1)return;
    if(!IsClipboardFormatAvailable(CF_UNICODETEXT) && OpenClipboard(NULL))
        return;
        
    HGLOBAL mem;
    size_t size;
    wchar_t* wstr;

    mem = (HGLOBAL)GetClipboardData(CF_UNICODETEXT);
    if (!mem) {
        CloseClipboard();
        return;
    }

    size = GlobalSize(mem) - 1;
    if (!size) {
        CloseClipboard();
        return;
    }

    wstr = (wchar_t*)GlobalLock(mem);
    if (!wstr) {
        CloseClipboard();
        return;
    }
    
    wcsncpy(str, wstr, len<size?len:size);

    GlobalUnlock(mem);
    CloseClipboard();
}

感谢版主大哥回复，sizeof(tmp)/sizeof(*tmp) 是不是要比字符串函数wcslen循环获取长度高效，一个除法就能搞定太牛了
但是为什么要用memcpy没明白

讲的很明白，我再试试

已测试过的

void gui_gdiplus_paste(wchar_t* str, int len)
{
    if(len<1)return;
    if(!IsClipboardFormatAvailable(CF_UNICODETEXT) || !OpenClipboard(NULL))
        return;
        
    HGLOBAL mem;
    size_t size;
    wchar_t* wstr;

    mem = (HGLOBAL)GetClipboardData(CF_UNICODETEXT);
    if (!mem) {
        CloseClipboard();
        return;
    }

    size = GlobalSize(mem);
    if (!size) {
        CloseClipboard();
        return;
    }
    
    size /= sizeof(wchar_t);
    size--;
    
    wstr = (wchar_t*)GlobalLock(mem);
    if (!wstr) {
        CloseClipboard();
        return;
    }
    
    int rlen = len<size?len:size;
    wcsncpy(str, wstr, rlen);
    str[rlen] = 0;

    GlobalUnlock(mem);
    CloseClipboard();
}

[此贴子已经被作者于2021-10-1 12:52编辑过]

最近又想用cairo(https://)来绘制ui，有人说性能不好，你用过没，性能怎么样？有没有什么坑？
Recently also want to use cairo to draw ui, some people say performance is not good, you have used not, performance how there is no pit

谢了，正好msys2中有cairo的库，有时间我去试试才知深浅，网上的片面之词不可信
Thanks, just ‘msys2’ has cairo library, there is time for me to try to know the depth, the one-sided words on the Internet is not credible