有c的源程序，想把它封成dll，然后在c#里调用获得压力信息，求教详细方法~

[amoeet]

网上找到了个数位板的源程序，可以获得笔尖压力等数据，
可是是用c编的生成的是可执行文件，
里面有一段：

LRESULT FAR PASCAL MainWndProc(hWnd, message, wParam, lParam)
HWND hWnd;
unsigned message;
WPARAM wParam;
LPARAM lParam;
{
	FARPROC lpProcAbout;
	static HCTX hTab = NULL;
	static POINT ptOld, ptNew;
	static UINT prsOld, prsNew;
	static RECT rcClient;
	PAINTSTRUCT psPaint;
	HDC hDC;
	PACKET pkt;
	BOOL fHandled = TRUE;
	LRESULT lResult = 0L;


	switch (message) {

		case WM_CREATE:
			hTab = TabletInit(hWnd);
			if (!hTab) {
				MessageBox(NULL, " Could Not Open Tablet Context.", "WinTab",
							MB_OK | MB_ICONHAND);

				SendMessage(hWnd, WM_DESTROY, 0, 0L);
			}
			break;

		case WM_SIZE:
			GetClientRect(hWnd, &rcClient);
			InvalidateRect(hWnd, NULL, TRUE);
			break;

		case WM_COMMAND:
			if (GET_WM_COMMAND_ID(wParam, lParam) == IDM_ABOUT) {
				lpProcAbout = MakeProcInstance(About, hInst);

				DialogBox(hInst, "AboutBox", hWnd, (DLGPROC)lpProcAbout);

				FreeProcInstance(lpProcAbout);
			}
			else
				fHandled = FALSE;
			break;

		case WT_PACKET:
			if (gpWTPacket((HCTX)lParam, wParam, &pkt)) {
				if (HIWORD(pkt.pkButtons)==TBN_DOWN) {
					MessageBeep(0);
				}
				ptOld = ptNew;
				prsOld = prsNew;
				ptNew.x = MulDiv((UINT)pkt.pkX, rcClient.right, 10000);
				ptNew.y = MulDiv((UINT)pkt.pkY, rcClient.bottom, 10000);
				prsNew = pkt.pkNormalPressure;//这个pkt.pkNormalPressure是我想要的数据
				if (ptNew.x != ptOld.x ||
					ptNew.y != ptOld.y ||
					prsNew != prsOld) {
					InvalidateRect(hWnd, NULL, TRUE);
				}
			}
			break;

		case WM_ACTIVATE:
			if (GET_WM_ACTIVATE_STATE(wParam, lParam))
				InvalidateRect(hWnd, NULL, TRUE);

			/* if switching in the middle, disable the region */
			if (hTab) {
				gpWTEnable(hTab, GET_WM_ACTIVATE_STATE(wParam, lParam));
				if (hTab && GET_WM_ACTIVATE_STATE(wParam, lParam))
					gpWTOverlap(hTab, TRUE);
			}
			break;

		case WM_DESTROY:
			if (hTab)
				gpWTClose(hTab);
			PostQuitMessage(0);
			break;

		case WM_PAINT:
			if (hDC = BeginPaint(hWnd, &psPaint)) {
				POINT ptHere;

				ptHere.x = ptNew.x;
				ptHere.y = rcClient.bottom - ptNew.y;

				/* redo horz */
				Ellipse(hDC, ptHere.x - prsNew, ptHere.y - prsNew,
						ptHere.x + prsNew, ptHere.y + prsNew);
				PatBlt(hDC, rcClient.left, ptHere.y,
						rcClient.right, 1, DSTINVERT);
				/* redo vert */
				PatBlt(hDC, ptHere.x, rcClient.top,
						1, rcClient.bottom, DSTINVERT);

				EndPaint(hWnd, &psPaint);
			}
			break;

		default:
			fHandled = FALSE;
			break;
	}
	if (fHandled)
		return (lResult);
	else
		return (DefWindowProc(hWnd, message, wParam, lParam));
}

里面
这个pkt.pkNormalPressure是我想要的数据，只是我不太懂c，求高手帮忙看下这个程序，教个封成dll的方法~

或者，这程序是用c调用wintab32.dll的，求教如何在c#里调用api获得pkt.pkNormalPressure的数值？

这个是源程序：
http://u.115.com/file/f56e245a3d

里面WacomEng_PC_Demos\PressureTest\PRSTEST.sln 这个项目，（想把它转成dll，里面加个读取压力的方法，然后在c#里导入调用。或者搞清楚调用api获取压力的方法，直接c#里调用api获得方法）

[xuzysun]

可以在C#主程序中加入
protected override void WndProc(ref System.Windows.Forms.Message e)
用于处理WT_PACKET事件，当然需要定义WT_PACKET所对应的值！

[amoeet]

谢谢~我试试看~

这个是c里面的
#define PACKETDATA (PK_X | PK_Y | PK_BUTTONS | PK_NORMAL_PRESSURE)

貌似就是这些值了吧~

还是这段里的
BOOL API WTClose(HCTX);
#define ORD_WTClose 22
int API WTPacketsGet(HCTX, int, LPVOID);
#define ORD_WTPacketsGet 23
BOOL API WTPacket(HCTX, UINT, LPVOID);
#define ORD_WTPacket 24
#endif

BOOL API WTPacket(HCTX, UINT, LPVOID);？