API之DLL
一个工作空间可以包含一个或多个项目
实例 APIDDL001
#include <windows.h>
#include "DLL1.h"
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("StrProg") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("DLL Demonstration Program"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
switch (message)
{
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_LBUTTONDOWN :
hdc =GetDC(hwnd ) ;
drawShap(hdc ,100 ,100 ) ;
ReleaseDC(hwnd ,hdc ) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//DLL1.H
#define EXPORT __declspec (dllexport)
EXPORT BOOL CALLBACK drawShap(HDC ,int ,int ) ;
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// DLL1.CPP
#include <windows.h>
#include "DLL1.h"
int WINAPI DllMain (HINSTANCE hInstance, DWORD fdwReason, PVOID pvReserved)
{
return TRUE ;
}
EXPORT BOOL CALLBACK drawShap(HDC hdc, int ix ,int iy )
{
MoveToEx(hdc , 0 ,0 ,NULL) ;
LineTo(hdc , ix ,iy );
return TRUE ;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////