C++ 获取剪贴板数据（CF_TEXT）
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GetClipboardData(CF_TEXT)
提问by behnam27
How to use GetClipboardData(CF_TEXT);without calling and use process id of this in C++?
and which libary does GetClipboardData(CF_TEXT)belong to?
如何GetClipboardData(CF_TEXT);在 C++ 中不调用和使用 this 的进程 id 的情况下使用？
哪个图书馆GetClipboardData(CF_TEXT)属于？
回答by Mr.C64
GetClipboardData()is a Win32 API function.
GetClipboardData()是一个 Win32 API 函数。
The handle returned by GetClipboardData()must be first locked with GlobalLock(), then you can retrieve the char*pointer of the ANSI text in the clipboard (note that if you want to retrieve Unicode text, you should use the CF_UNICODETEXTformat).
返回的句柄GetClipboardData()必须先用 锁定GlobalLock()，然后才能char*在剪贴板中检索ANSI文本的指针（注意，如果要检索Unicode文本，应使用CF_UNICODETEXT格式）。
A sample code to retrieve the text from the clipboard and store it in a convenient std::stringclass instance follows (error management omitted for simplicity):
下面是从剪贴板检索文本并将其存储在方便的std::string类实例中的示例代码（为简单起见，省略了错误管理）：
std::string GetClipboardText()
{
// Try opening the clipboard
if (! OpenClipboard(nullptr))
... // error
// Get handle of clipboard object for ANSI text
HANDLE hData = GetClipboardData(CF_TEXT);
if (hData == nullptr)
... // error
// Lock the handle to get the actual text pointer
char * pszText = static_cast<char*>( GlobalLock(hData) );
if (pszText == nullptr)
... // error
// Save text in a string class instance
std::string text( pszText );
// Release the lock
GlobalUnlock( hData );
// Release the clipboard
CloseClipboard();
return text;
}
You can use C++ RAII pattern and manage error conditions using exceptions, something like this:
您可以使用 C++ RAII 模式并使用异常管理错误条件，如下所示：
#include <exception>
#include <iostream>
#include <ostream>
#include <stdexcept>
#include <string>
#include <windows.h>
using namespace std;
class RaiiClipboard
{
public:
RaiiClipboard()
{
if (! OpenClipboard(nullptr))
throw runtime_error("Can't open clipboard.");
// ... or define some custom exception class for clipboard errors.
}
~RaiiClipboard()
{
CloseClipboard();
}
// Ban copy
private:
RaiiClipboard(const RaiiClipboard&);
RaiiClipboard& operator=(const RaiiClipboard&);
};
class RaiiTextGlobalLock
{
public:
explicit RaiiTextGlobalLock(HANDLE hData)
: m_hData(hData)
{
m_psz = static_cast<const char*>(GlobalLock(m_hData));
if (! m_psz)
throw runtime_error("Can't acquire lock on clipboard text.");
}
~RaiiTextGlobalLock()
{
GlobalUnlock(m_hData);
}
const char* Get() const
{
return m_psz;
}
private:
HANDLE m_hData;
const char* m_psz;
// Ban copy
RaiiTextGlobalLock(const RaiiTextGlobalLock&);
RaiiTextGlobalLock& operator=(const RaiiTextGlobalLock&);
};
string GetClipboardText()
{
RaiiClipboard clipboard;
HANDLE hData = GetClipboardData(CF_TEXT);
if (hData == nullptr)
throw runtime_error("Can't get clipboard text.");
RaiiTextGlobalLock textGlobalLock(hData);
string text( textGlobalLock.Get() );
return text;
}
int main()
{
static const int kExitOk = 0;
static const int kExitError = 1;
try
{
cout << GetClipboardText() << endl;
return kExitOk;
}
catch(const exception& e)
{
cerr << "*** ERROR: " << e.what() << endl;
return kExitError;
}
}
