你好，OpenProcess()函数返回值为什么返回NULL 急需解决

Question

魔兽3 运行后,运行该段代码,hwnd 值不为 NULL,为什么 handle 值为 NULL?
c++ 代码如下:

HWND hwnd = FindWindow( NULL, L"Warcraft III");
DWORD wtp_id = 0;

if( hwnd != NULL )
{
HANDLE handle = OpenProcess( PROCESS_ALL_ACCESS, false, GetWindowThreadProcessId( hwnd, &wtp_id ) );
if( handle != NULL )
{
//可在这里添加读写内存的代码
CloseHandle( handle );
}
}

Answer 1

If the function succeeds, the return value is an open handle to the specified process.If the function fails, the return value is NULL. To get extended error information, call GetLastError.就是说如果函数执行成功的话返回的就是一个打开进程的句柄，如果失败了就是NULL，具体错误的原因你可以调用GetLastError查看

Answer 2

如果你是用VS2008的话，可能是程序执行权限问题，可以试试这样：//提升程序的权限BOOL EnablePrivilege(LPCSTR lpName, BOOL fEnable){HANDLE hObject;LUID Luid;TOKEN_PRIVILEGES NewStatus;if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hObject))return FALSE;if (LookupPrivilegeValue(NULL, lpName, &Luid)){NewStatus.Privileges[0].Luid = Luid;NewStatus.PrivilegeCount = 1;NewStatus.Privileges[0].Attributes = fEnable ? SE_PRIVILEGE_ENABLED : 0;AdjustTokenPrivileges(hObject, FALSE, &NewStatus, 0, 0, 0);CloseHandle(hObject);return TRUE;}return FALSE;}OnInitDialog()中调用：EnablePrivilege(SE_DEBUG_NAME,TRUE); //提升程序的权限