The DuplicateHandlefunction creates a duplicate handle. The returned duplicate is in the caller’s process space.（从当前进程复制句柄到其他进程空间）
//ALL of the following code is executed by Process S.
//Create a mutex object accessible by Process S.
HANDLE hObjProcessS = CreateMutex(NULL, FALSE, NULL);
//Open a handle to Process T’s kernel object.
HANDLE hProcessT = OpenProcess(PROCESS_ALL_ACCESS,
FALSE, dwProcessIdT);
//An uninitilized handle relative to Process T.
HANDLE hObjProcessT;
//Give Process T accesss to our mutex object
DuplicateHandle(GetCurrentProcess(),
hObjProcessS,
hProcessT,
&hObjProcessT, 0, FALSE,
DUPLICATE_SAME_ACCESS);
//Use some IPC mechanism to get the handle
//valuein hOnjProcess S into Process T
//We nolonger need to communicate with Process T.
//[Mailslot, pipe, share memory, socket. etc.]
//传递句柄的值到其他进程
CloseHandle(hProcessT);
//WhenProcess S no longer needs to Use the mutex,
//itshould close it.
CloseHandle(hObjProcessS);
向系统进程中，复制打开的文件句柄，内核对象在所有引用未删除时不会销毁。
示例代码：
#include
BOOL OccupyFile( LPCTSTR lpFileName );
int main()
{
OccupyFile(“c:\\duplicateHandle_Test.txt”);
return 0;
}
void RaiseToDebugP()
{
HANDLE hToken;
HANDLE hProcess = GetCurrentProcess();
if ( OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken) )
{
TOKEN_PRIVILEGES tkp;
if ( LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &tkp.Privileges[0].Luid) )
{
tkp.PrivilegeCount = 1;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
BOOL bREt = AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, NULL, 0) ;
}
CloseHandle(hToken);
}
}
BOOL OccupyFile( LPCTSTR lpFileName )
{
BOOL bRet;
RaiseToDebugP();
HANDLE hProcess = OpenProcess( PROCESS_DUP_HANDLE, FALSE, 4); // 4为system pid
if ( hProcess == NULL )
{
hProcess = OpenProcess( PROCESS_DUP_HANDLE, FALSE, 8); // OS-2K is 8
if ( hProcess == NULL )
return FALSE;
}
HANDLE hFile;
HANDLE hTargetHandle;
hFile = CreateFile( lpFileName, GENERIC_READ, 0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL, NULL);
if ( hFile == INVALID_HANDLE_VALUE )
{
CloseHandle( hProcess );
return FALSE;
}
bRet = DuplicateHandle( GetCurrentProcess(), hFile, hProcess, &hTargetHandle,
0, FALSE, DUPLICATE_SAME_ACCESS|DUPLICATE_CLOSE_SOURCE);
CloseHandle( hProcess );
return bRet;
}
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