API之DLL

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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,

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 ;

}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////