How to change clipboard data in Windows - c++

Question

I have the following clipboard data:
Can I somehow change indexes of these records?
Also can I remove / make zero-length some of them?
Is it possible via WinAPI?
As for the first question, I don't see any function for this purpose.
As for the second question, I wrote the following code:
#include <Windows.h>
int main()
{
OpenClipboard(NULL);
HGLOBAL hdst = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, sizeof(int));
int* dst = (int*)GlobalLock(hdst);
dst[0] = 0;
GlobalUnlock(hdst);
SetClipboardData(49166, hdst);
CloseClipboard();
}
but it didn't zeroed the record of the 49166 format.
How can I do it?

Answer 1

This is a method to do that. First, obtain the clipboard data string by use GetClipboardData api, and then modify the data string by your way. Second, rewrite string to cliboard by use SetClipboardData api.
You don't call GetClipboardData first from you code, you can do that like this:
char *buffer = NULL;
CString fromClipboard;
//open the cliboard
if (OpenClipboard())
{
HANDLE hData = GetClipboardData(CF_TEXT);
char* buffer = (char *)GlobalLock(hData);
fromClipboard = buffer;
//modify fromClipboard string by your method and rewrite to clipboard
//maybe like this
fromCliboard.Replace("hello", "world");
HGLOBAL clipbuffer;
char* buffer;
EmptyClipboard();
clipbuffer = GlobalAlloc(GMEM_DDESHARE, source.GetLength()+1);
buffer = (char*)GlobalLock(clipbuffer);
strcpy(buffer, LPCSTR(source));
GlobalUnlock(hData);
GlobalUnlock(clipbuffer);
SetClipboardData(CF_TEXT,clipbuffer);
CloseClipboard();
}