windows复制粘贴的代码 - 编程论坛

#2

rjsp2021-09-27 09:21

当我遇到不熟悉的函数时，我都去查官方说法，从不瞎猜

程序代码：

#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;
}

#3

自由而无用2021-09-27 09:33

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

#4

xyzdwf2021-09-27 10:48

回复 2楼 rjsp

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

#5

rjsp2021-09-27 11:47

回复 4楼 xyzdwf

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

#6

rjsp2021-09-27 11:49

回复 4楼 xyzdwf

sizeof(tmp)/sizeof(*tmp) 是不是要比字符串函数wcslen循环获取长度高效

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。

#7

xyzdwf2021-09-27 14:53

回复 6楼 rjsp

讲的很明白，我再试试

#8

xyzdwf2021-09-27 17:32

回复 5楼 rjsp

已测试过的

程序代码：

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]

#9

xyzdwf2021-09-27 17:35

回复 3楼自由而无用

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

#10

自由而无用2021-09-27 17:41

oh sorry, never heard of it, my mistake

, gui is a very complicated subsystem, I m too old to pick it up again

#11

xyzdwf2021-09-27 17:52

回复 10楼自由而无用

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

#12

自由而无用2021-09-27 17:57

smart boy, I really like what you said, you have a great PQ(practice quotient)