计算机二级C技巧：VC6.0控制鼠标反方向移动

　　dll代码：

　　#define _WIN32_WINNT 0x400

　　#include

　　#pragma data_seg("Shared")

　　HHOOK NextHook = NULL;

　　SIZE Screen = {0, 0};

　　POINT pt = {0, 0};

　　#pragma data_seg()

　　HMODULE 设为首页 Module;

　　BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)

　　{

　　if (ul_reason_for_call == DLL_PROCESS_ATTACH)

　　Module = hModule;

　　return TRUE;

　　}

　　LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)

　　{

　　if (nCode == 0)

　　{

　　PMSLLHOOKSTRUCT mhs = (PMSLLHOOKSTRUCT)lParam;

　　if (mhs->pt.x != pt.x || mhs->pt.y != pt.y)

　　{

　　pt.x = pt.x - (mhs->pt.x - pt.x);

　　pt.y = pt.y - (mhs->pt.y - pt.y);

　　if (pt.x < 0) pt.x = 0;

　　if (pt.y < 0) pt.y = 0;

　　if (pt.x >= Screen.cx) pt.x = Screen.cx - 1;

　　if (pt.y >= Screen.cy) pt.y = Screen.cy - 1;

　　SetCursorPos(pt.x, pt.y);

　　return TRUE;

　　}

　　}

　　return CallNextHookEx(NextHook, nCode, wParam, lParam);

　　}

　　__declspec(dllexport) void StartHook()

　　{

　　Screen.cx = GetSystemMetrics(SM_CXSCREEN);

　　Screen.cy = GetSystemMetrics(SM_CYSCREEN);

　　GetCursorPos(&pt);

　　NextHook = SetWindowsHookEx(WH_MOUSE_LL, LowLevelMouseProc, Module, 0);

　　}

　　__declspec(dllexport) void StopHook()

　　{

　　UnhookWindowsHookEx(NextHook);

　　}