barrier/synergy/CMSWindowsClipboard.cpp

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#include "CMSWindowsClipboard.h"
#include "CString.h"
#include "CLog.h"
//
// CMSWindowsClipboard
//
CMSWindowsClipboard::CMSWindowsClipboard(HWND window) : m_window(window)
{
// do nothing
}
CMSWindowsClipboard::~CMSWindowsClipboard()
{
// do nothing
}
bool CMSWindowsClipboard::open()
{
log((CLOG_INFO "open clipboard"));
if (!OpenClipboard(m_window)) {
log((CLOG_WARN "failed to open clipboard"));
return false;
}
if (EmptyClipboard()) {
log((CLOG_DEBUG "grabbed clipboard"));
}
else {
log((CLOG_WARN "failed to grab clipboard"));
}
return true;
}
void CMSWindowsClipboard::close()
{
log((CLOG_INFO "close clipboard"));
CloseClipboard();
}
void CMSWindowsClipboard::add(
EFormat format, const CString& data)
{
log((CLOG_INFO "add %d bytes to clipboard format: %d", data.size(), format));
if (!OpenClipboard(m_window)) {
log((CLOG_WARN "failed to open clipboard"));
return;
}
// convert data to win32 required form
const UINT win32Format = convertFormatToWin32(format);
HANDLE win32Data;
switch (win32Format) {
case CF_TEXT:
win32Data = convertTextToWin32(data);
break;
default:
win32Data = NULL;
break;
}
// put the data on the clipboard
if (win32Data != NULL) {
SetClipboardData(win32Format, win32Data);
}
// done with clipboard
CloseClipboard();
}
bool CMSWindowsClipboard::has(EFormat format) const
{
const UINT win32Format = convertFormatToWin32(format);
return (win32Format != 0 && IsClipboardFormatAvailable(win32Format) != 0);
}
CString CMSWindowsClipboard::get(EFormat format) const
{
// get the win32 format. return empty data if unknown format.
const UINT win32Format = convertFormatToWin32(format);
if (win32Format == 0)
return CString();
if (!OpenClipboard(m_window)) {
log((CLOG_WARN "failed to open clipboard"));
return CString();
}
// get a handle to the clipboard data and convert it
HANDLE win32Data = GetClipboardData(win32Format);
CString data;
if (win32Data != NULL) {
// convert the data
switch (win32Format) {
case CF_TEXT:
data = convertTextFromWin32(win32Data);
}
}
// close the clipboard
CloseClipboard();
return data;
}
UINT CMSWindowsClipboard::convertFormatToWin32(
EFormat format) const
{
switch (format) {
case kText:
return CF_TEXT;
default:
return 0;
}
}
HANDLE CMSWindowsClipboard::convertTextToWin32(
const CString& data) const
{
// compute size of converted text
UInt32 dstSize = 0;
const UInt32 srcSize = data.size();
const char* src = data.c_str();
for (UInt32 index = 0; index < srcSize; ++index) {
if (src[index] == '\n') {
// add \r
++dstSize;
}
++dstSize;
}
// allocate
HGLOBAL gData = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, dstSize);
if (gData != NULL) {
// get a pointer to the allocated memory
char* dst = (char*)GlobalLock(gData);
if (dst != NULL) {
// convert text. we change LF to CRLF.
dstSize = 0;
for (UInt32 index = 0; index < srcSize; ++index) {
if (src[index] == '\n') {
// add \r
dst[dstSize++] = '\r';
}
dst[dstSize++] = src[index];
}
// done converting
GlobalUnlock(gData);
}
}
return gData;
}
CString CMSWindowsClipboard::convertTextFromWin32(
HANDLE handle) const
{
// get source data and it's size
const char* src = (const char*)GlobalLock(handle);
UInt32 srcSize = (SInt32)GlobalSize(handle);
if (src == NULL || srcSize == 0)
return CString();
// compute size of converted text
UInt32 dstSize = 0;
UInt32 index;
for (index = 0; index < srcSize; ++index) {
if (src[index] == '\r') {
// skip \r
if (index + 1 < srcSize && src[index + 1] == '\n')
++index;
}
++dstSize;
}
// allocate
CString data;
data.reserve(dstSize);
// convert text. we change CRLF to LF.
for (index = 0; index < srcSize; ++index) {
if (src[index] == '\r') {
// skip \r
if (index + 1 < srcSize && src[index + 1] == '\n')
++index;
}
data += src[index];
}
return data;
}