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Browse - Programming Tips - How can I programmically copy'n'paste to the Windows clipboard?

Date: 2009aug29
OS: Windows
Platform: windows

Q.  How can I programmically copy'n'paste to the Windows clipboard?

A.  I use a class based on

http://www.codeguru.com/cpp/w-p/clipboard/article.php/c3013/

--- Clipboard.h ---

// CClipboard Class // ---------------- // Written by David Terracino <davet@lycosemail.com> // // This code is released into the public domain, because // it's silly easy. If you want to use and expand it, go // ahead; fine by me. If you do expand this class's // functionality, please consider sending it back up to // the MFC Programmer's Sourcebook at www.codeguru.com. // // And as always, please give credit where credit is // due. Don't remove my name from the source. #ifndef __CCLIPBOARD_H #define __CCLIPBOARD_H class CClipboard { public: static BOOL GetText(LPSTR lpszBuffer, const size_t nBufSize, HWND hWnd = NULL); static BOOL GetTextLength(size_t *pnSize, HWND hWnd = NULL); static BOOL SetText(LPCSTR lpszBuffer, HWND hWND = NULL); }; #endif
--- Clipboard.cpp ---
// CClipboard Class // ---------------- // Written by David Terracino <davet@lycosemail.com> // // This code is released into the public domain, because // it's silly easy. If you want to use and expand it, go // ahead; fine by me. If you do expand this class's // functionality, please consider sending it back up to // the MFC Programmer's Sourcebook at www.codeguru.com. // // And as always, please give credit where credit is // due. Don't remove my name from the source. #include "stdafx.h" #include "Clipboard.h" //////////////////////////////////////////////////////////////////// // GetText // - Retrieves text from the clipboard //////////////////////////////////////////////////////////////////// // // Parameters: // lpszBuffer - pointer to a string where the text is to be put // nBufSize - allocated length of lpszBuffer // hWnd - window handle to be used by clipboard // // Return Values: // TRUE - Text was successfully copied from clipboard // FALSE - No text on the clipboard // //////////////////////////////////////////////////////////////////// BOOL CClipboard::GetText(LPSTR lpszBuffer, const size_t nBufSize, HWND hWnd) { HGLOBAL hGlobal; // Global memory handle LPSTR lpszData; // Pointer to clipboard data unsigned long nSize; // Size of clipboard data // First, open the clipboard. OpenClipboard() takes one // parameter, the handle of the window that will temporarily // be it's owner. If NULL is passed, the current process // is assumed. OpenClipboard(hWnd); // Request a pointer to the text on the clipboard. hGlobal = GetClipboardData(CF_TEXT); // If there was no text on the clipboard, we have // been returned a NULL handle. if (hGlobal == NULL) return FALSE; // Now we have a global memory handle to the text // stored on the clipboard. We have to lock this global // handle so that we have access to it. lpszData = (LPSTR)GlobalLock(hGlobal); // Now get the size of the text on the clipboard. nSize = GlobalSize(hGlobal); // Make sure the text on the clipboard is not longer // that the buffer that was allocated for it. If it was // snip the text on the clipboard so that it fits. if (nSize >= (UINT)nBufSize) nSize = nBufSize - 1; // Now, copy the text into the return buffer. At the // end, we need to add a NULL string terminator. // for (UINT i = 0; i < nSize; ++i) // *(lpszBuffer + i) = *(lpszData + i); memcpy(lpszBuffer, lpszData, nSize); // davekb.com // *(lpszBuffer + i) = 0; lpszBuffer[nSize] = 0; // davekb.com // Now, simply unlock the global memory pointer // and close the clipboard. GlobalUnlock(hGlobal); CloseClipboard(); return TRUE; } //////////////////////////////////////////////////////////////////// // GetTextLength // - Retrieves length of text on the clipboard //////////////////////////////////////////////////////////////////// // // Parameters: // pnSize - pointer to unsigned long that will receive // the length of the text on the clipboard. // NOTE: Does not include NULL terminator. // hWnd - window handle to be used by clipboard // // Return Values: // TRUE - Text length was successfully returned. // FALSE - No text on the clipboard // //////////////////////////////////////////////////////////////////// BOOL CClipboard::GetTextLength(size_t *pnSize, HWND hWnd) { HGLOBAL hGlobal; // Global memory handle unsigned long nSize; // Size of clipboard data LPSTR lpszData; // Pointer to clipboard data // First, open the clipboard. OpenClipboard() takes one // parameter, the handle of the window that will temporarily // be it's owner. If NULL is passed, the current process // is assumed. OpenClipboard(hWnd); // Request a pointer to the text on the clipboard. hGlobal = GetClipboardData(CF_TEXT); // If there was no text on the clipboard, we have // been returned a NULL handle. if (hGlobal == NULL) return FALSE; // Now we have a global memory handle to the text // stored on the clipboard. We have to lock this global // handle so that we have access to it. lpszData = (LPSTR)GlobalLock(hGlobal); // Now get the size of the text on the clipboard. nSize = GlobalSize(hGlobal); // Now, simply unlock the global memory pointer // and close the clipboard. GlobalUnlock(hGlobal); CloseClipboard(); // Finally, save the length of the string we found // into the pnSize pointer and return. *pnSize = nSize; return TRUE; } //////////////////////////////////////////////////////////////////// // SetText // - Places text on the clipboard //////////////////////////////////////////////////////////////////// // // Parameters: // lpszBuffer - pointer to a string where the text is to be put // hWnd - window handle to be used by clipboard // // Return Values: // TRUE - Text was successfully copied from clipboard // FALSE - No text on the clipboard // //////////////////////////////////////////////////////////////////// int CClipboard::SetText(LPCSTR lpszBuffer, HWND hWnd) { HGLOBAL hGlobal; // Global memory handle LPSTR lpszData; // Pointer to clipboard data unsigned long nSize; // Size of clipboard data // First, open the clipboard. OpenClipboard() takes one // parameter, the handle of the window that will temporarily // be it's owner. If NULL is passed, the current process // is assumed. After opening, empty the clipboard so we // can put our text on it. OpenClipboard(hWnd); EmptyClipboard(); // Get the size of the string in the buffer that was // passed into the function, so we know how much global // memory to allocate for the string. nSize = lstrlen(lpszBuffer); // Allocate the memory for the string. hGlobal = GlobalAlloc(GMEM_ZEROINIT, nSize+1); // If we got any error during the memory allocation, // we have been returned a NULL handle. if (hGlobal == NULL) return FALSE; // Now we have a global memory handle to the text // stored on the clipboard. We have to lock this global // handle so that we have access to it. lpszData = (LPSTR)GlobalLock(hGlobal); // Now, copy the text from the buffer into the allocated // global memory pointer. // for (UINT i = 0; i < nSize + 1; ++i) // *(lpszData + i) = *(lpszBuffer + i); memcpy(lpszData, lpszBuffer, nSize+1); // davekb.com // Now, simply unlock the global memory pointer, // set the clipboard data type and pointer, // and close the clipboard. GlobalUnlock(hGlobal); SetClipboardData(CF_TEXT, hGlobal); CloseClipboard(); return TRUE; }
------------------8<-------------------------------------
void exampleUse() { // Copy stuff into the clipboard CClipboard::SetText("Put this text in the clipboard"); // Retrieve text from the clipboard char buf[256]; CClipboard::GetText(buf, sizeof(buf)); }

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