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();
}

当我遇到不熟悉的函数时，我都去查官方说法，从不瞎猜

#include <windows.h>

bool gui_gdiplus_paste( wchar_t* str, size_t len )
{
    str[0] = L'\0';

    if( !IsClipboardFormatAvailable(CF_UNICODETEXT) )
        return true;

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

    SIZE_T size = GlobalSize(mem);
    if( size == 0 ) {
        CloseClipboard();
        return true;
    }

    if( size > len*sizeof(wchar_t) ) {
        CloseClipboard();
        return false;
    }

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

    memcpy( str, wstr, size );

    GlobalUnlock(mem);
    CloseClipboard();
    return true;
}

int main( void )
{
    wchar_t tmp[1000];
    gui_gdiplus_paste( tmp, sizeof(tmp)/sizeof(*tmp) );

    return 0;
}

wow, gui is a very very lovely & fashion subsystem
take good care of her, fall in love with her, thats a very very romantic feeling

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

你用什么函数无所谓
但 GlobalSize 返回的是 字节数，不是 wchar_t 的数量

两个完全不相干的东西。

比如 wchar_t s[100] = L"abc";
sizeof(tmp)/sizeof(*tmp) 获得的是数组长度 100；
wcslen(s) 获得的是 NULL结尾字符串 的长度 3。

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

oh sorry, never heard of it, my mistake, gui is a very complicated subsystem, I m too old to pick it up again