在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
8QoxU"
c&
YV!hlYOBi 一、实现方法
niKfat? 0[e!/*_V 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
6?;z\AP& 9g>)7Ne #pragma data_seg("shareddata")
s^K2,D]P HHOOK hHook =NULL; //钩子句柄
hidQO h UINT nHookCount =0; //挂接的程序数目
: ^("L,AF static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Id&e' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
M X8|;t static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
5OzEY7K) static int KeyCount =0;
;j7G$s9 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
6su~SPh #pragma data_seg()
o]RZd--c< k5Fj"U 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
~$J(it-a p4*L}Q DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
*tgu@9b tW/g0lC% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
8|)^m[c& cKey,UCHAR cMask)
@XXPJq;J {
_DH^ K9,9 BOOL bAdded=FALSE;
gWzslgO6 for(int index=0;index<MAX_KEY;index++){
RB4 +"QUh if(hCallWnd[index]==0){
"RN]
@p#m hCallWnd[index]=hWnd;
L!lmy&1 HotKey[index]=cKey;
`$S&:Q, HotKeyMask[index]=cMask;
{:|3V 7X bAdded=TRUE;
?_i>Kx KeyCount++;
[
'lu;1-, break;
rM"27ud[`_ }
ninWnQq }
0o"aSCq8t return bAdded;
f!`?_ }
dGn0-l'q //删除热键
bXOKC BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)N8bOI {
UaF~[toX BOOL bRemoved=FALSE;
{MSE}|A\V for(int index=0;index<MAX_KEY;index++){
4P k%+l if(hCallWnd[index]==hWnd){
Z)M
"`2Ur if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_eOC,J<-~ hCallWnd[index]=NULL;
5dI=;L>D HotKey[index]=0;
J\Pb/9M/ HotKeyMask[index]=0;
oDMPYkpTu bRemoved=TRUE;
XhHgXVVGG< KeyCount--;
OyF=G^w break;
R`Z"ey@C }
nOvR, 6 }
_ERtL5^ }
G<n75! return bRemoved;
M|mfkIk0MB }
]}XDDPbZ} $Gv@lZ@= C2"^YRN, DLL中的钩子函数如下:
l|?tqCT ^h Nw1*);b[y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
1+uZF {
CTRUr" BOOL bProcessed=FALSE;
r)pt(*KHo if(HC_ACTION==nCode)
Sb /?<$> {
Sv{n?BYq if((lParam&0xc0000000)==0xc0000000){// 有键松开
:J]'c} switch(wParam)
t{jY@JT| {
b>OB}Is case VK_MENU:
w\o6G7 MaskBits&=~ALTBIT;
W~;Jsd=f break;
u9OY
Jo case VK_CONTROL:
AX8~w(sv MaskBits&=~CTRLBIT;
<VKJ+ break;
-je} PwT case VK_SHIFT:
X]p3?"7 MaskBits&=~SHIFTBIT;
~3?-l/ $ break;
R+Hu?Dv&F default: //judge the key and send message
{MUiK5: break;
pqb'L] }
Lc{arhN for(int index=0;index<MAX_KEY;index++){
kg]6q T;Y if(hCallWnd[index]==NULL)
1"ZtE\{
" continue;
FT-.gi0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P);s0Y|@H {
uI7n{4W*x SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
= 'o3 <} bProcessed=TRUE;
BqNeY<zB* }
dgkS5Q$/ }
pD%(Y^h? }
O D}RnKL else if((lParam&0xc000ffff)==1){ //有键按下
~~OFymQ%?q switch(wParam)
**hQb$ {
uGMzU&+ case VK_MENU:
+M0pmK! MaskBits|=ALTBIT;
c a_mift break;
"CJ~BJI% case VK_CONTROL:
_Hv+2E[4Z MaskBits|=CTRLBIT;
5
3%>)gk: break;
4f[%Bb case VK_SHIFT:
<u!cdYo@ MaskBits|=SHIFTBIT;
6WY/[TC- break;
f$xXR$mjf default: //judge the key and send message
mQ:{>` break;
2Cz haO }
;|5-{+2 U% for(int index=0;index<MAX_KEY;index++){
$9,&BW_* if(hCallWnd[index]==NULL)
LgNIb continue;
&W@2n&U.q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^z{szy?Fg {
z$%twBg}# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
eIkKsgr> bProcessed=TRUE;
Food<(!.> }
Y~I<L ocv }
*U[yeE]. }
4b2d(x)0X if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
k XSX<b <% for(int index=0;index<MAX_KEY;index++){
uAn}qrqE9 if(hCallWnd[index]==NULL)
5daq}hsQs continue;
@L3XBV2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T$%|=gq SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p\w<~pN[ //lParam的意义可看MSDN中WM_KEYDOWN部分
4nsJZo#S/ }
Q1,sjLO-a }
YExgUE| }
l^lb ^"o return CallNextHookEx( hHook, nCode, wParam, lParam );
M|*YeVs9# }
XIdh9)]^} 32YbBGDN!f 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
[s(D==8 K;RH,o1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l[/`kK BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_ox+5?> b7QE 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
YaC%69C' ?_NKyiu95 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
yH/A9L,Z {
4VJUu`[ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
u:l-qD9=( {
S+T/(-W //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
G4)~p!TSQ SaveBmp();
;g|Vt}a&4 return FALSE;
<Y]LY_( }
tk"+ u_u w …… //其它处理及默认处理
nuce(R }
X94a mJSfn"b}K c#n
2! 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
}s~c(sL?; Y sM*d 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
|b SI}s 二、编程步骤
E/zf9\ ']M/'CcM 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
cM#rus?)+ 2e`}O 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
WMB%?30 1MN! 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
U2
*ORd U+Y(: 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
JVc{vSa!rm :"%/u9<A 5、 添加代码,编译运行程序。
G|wtl(}3 2cMCZuO 三、程序代码
L+am-k:T~ 3Ua?^2l ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
aFnel8 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
[9; @1I<x #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
qe0 D[L #if _MSC_VER > 1000
KdVKvs[ #pragma once
'~[8>Q> #endif // _MSC_VER > 1000
![_x/F9 #ifndef __AFXWIN_H__
KgL!~J #error include 'stdafx.h' before including this file for PCH
bZnOX*y] #endif
EQ1**[$ #include "resource.h" // main symbols
MGg(d class CHookApp : public CWinApp
]fyfL|(; {
V1aP_G-: public:
hOj{y2sc CHookApp();
@62T:Vl // Overrides
'}.Yf_ // ClassWizard generated virtual function overrides
/R#zu_i //{{AFX_VIRTUAL(CHookApp)
">H*InF public:
{9x_E { virtual BOOL InitInstance();
o<G 9t6~ virtual int ExitInstance();
WZ CI*' //}}AFX_VIRTUAL
Z
vysLHj //{{AFX_MSG(CHookApp)
=nEP:7~{ // NOTE - the ClassWizard will add and remove member functions here.
4E$MhP
// DO NOT EDIT what you see in these blocks of generated code !
1!#N-^qk //}}AFX_MSG
`Q@7,z=f DECLARE_MESSAGE_MAP()
M(-)\~9T };
&uq.k{<p\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
&K^0PzWWof BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
dOhSqx56 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:#rP$LSYC BOOL InitHotkey();
-&Rv=q> BOOL UnInit();
{;yO3];Hqw #endif
*;<fh,wOk KWJVc
` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
].d2C J' #include "stdafx.h"
!=[Y yh #include "hook.h"
z0 "DbZ;d #include <windowsx.h>
)jM%bUk,! #ifdef _DEBUG
q
W(@p` #define new DEBUG_NEW
1Bh"'9-!JT #undef THIS_FILE
vW+6_41ZM static char THIS_FILE[] = __FILE__;
eaw!5]huu #endif
k&Pt\- 9on #define MAX_KEY 100
_7c3=f83 #define CTRLBIT 0x04
wi2`5G6|z #define ALTBIT 0x02
=KE7NXu]- #define SHIFTBIT 0x01
[|]J8o@u^ #pragma data_seg("shareddata")
YI0
wr1N HHOOK hHook =NULL;
Oa[ UINT nHookCount =0;
CoN[Yf3\ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@Z5q2Q static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
wuqe{? static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Eb3 ZM# static int KeyCount =0;
o_:v?Y>0 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
)%(ZFn} #pragma data_seg()
u6|C3,!z" HINSTANCE hins;
oF%m void VerifyWindow();
kg/ B<w' BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
i VSNara //{{AFX_MSG_MAP(CHookApp)
:5YIoC // NOTE - the ClassWizard will add and remove mapping macros here.
]N>ZOV,> // DO NOT EDIT what you see in these blocks of generated code!
|$Yk)z3 //}}AFX_MSG_MAP
)V1XL END_MESSAGE_MAP()
0seCQANd g6M>S1oOO CHookApp::CHookApp()
z/7q#~J, {
5P,&VB8L // TODO: add construction code here,
V?mP7 // Place all significant initialization in InitInstance
bWFa{W5! }
?ANWI8'_j ~f<']zXv CHookApp theApp;
~ k*]Z8Z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[ 8Ohg {
l}nV WuD BOOL bProcessed=FALSE;
85<k'>~L if(HC_ACTION==nCode)
ZrN(Mp {
&;PxDlY5 if((lParam&0xc0000000)==0xc0000000){// Key up
8Km&3nCv$Q switch(wParam)
G ek?+|m {
PGTEIptX7 case VK_MENU:
7oZ:/6_> MaskBits&=~ALTBIT;
\u[x<-\/6 break;
&V38)83a case VK_CONTROL:
H<Snp) MaskBits&=~CTRLBIT;
SmXoNiM"y break;
F`D$bE;| case VK_SHIFT:
h:Pfiw] MaskBits&=~SHIFTBIT;
N/a4Gl( break;
|Ajd$+3 default: //judge the key and send message
J;4x$BI break;
UP](1lAf }
9q;O`& for(int index=0;index<MAX_KEY;index++){
!BQt+4G7 if(hCallWnd[index]==NULL)
mWviWHK continue;
-]3 K#M)s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
S_lGrk\j {
- H?c4? 5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
v93b8/1 bProcessed=TRUE;
1*O|[W }
O8;/oL4 U }
6h9(u7(-N }
+d,
~h_7! else if((lParam&0xc000ffff)==1){ //Key down
A 3 V switch(wParam)
!LKxZ" {
:= V?; case VK_MENU:
k+J3Kl09hM MaskBits|=ALTBIT;
geQ!}zXWi break;
d9{lj(2P case VK_CONTROL:
,TBOEu."4 MaskBits|=CTRLBIT;
_zj^k$ j break;
QqM[W/&R case VK_SHIFT:
A
mZXUb MaskBits|=SHIFTBIT;
W8W7<ml0A break;
{B$CqsvJ default: //judge the key and send message
- %fQr5 break;
8xy8/UBIk0 }
V]zZb-m= for(int index=0;index<MAX_KEY;index++)
*Y> w0k {
b9H(w%7ucU if(hCallWnd[index]==NULL)
poz_=,c continue;
^J^,@Hf_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ip8ml0oG {
]J Yz(m[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
+C%6jGGh bProcessed=TRUE;
&bTCTDZh }
n Bm ]? }
[F<E0rjwM }
(]@S<0 if(!bProcessed){
*7Vb([x4; for(int index=0;index<MAX_KEY;index++){
BA\aVhmx if(hCallWnd[index]==NULL)
t<rIg1 continue;
F5?S8=i if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:8b'HhjM SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#Y5k/NPg }
GvVkb==" }
7}iv+rQ }
J;& y?%{@5 return CallNextHookEx( hHook, nCode, wParam, lParam );
::Zo` vP }
/WQ.,a ;L-=z]IR, BOOL InitHotkey()
5=o ^/Vkc {
R3B+vLGX if(hHook!=NULL){
ZthT('"a nHookCount++;
<8WFaP3, return TRUE;
7uR;S:WX }
\HGf!zZ else
|~Dl<#58 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
mCO1,? if(hHook!=NULL)
^s)`UZ<C= nHookCount++;
]p! { return (hHook!=NULL);
5dj" UxH }
b
3x|Dq . BOOL UnInit()
^hLr9k {
_LJF:E5L if(nHookCount>1){
2yA)SGri nHookCount--;
U[wx){[| return TRUE;
bq/Aopfr }
kj6:P$tH BOOL unhooked = UnhookWindowsHookEx(hHook);
"2mPWRItO if(unhooked==TRUE){
j_JY[sex nHookCount=0;
/1OCK= hHook=NULL;
XIwJhsYZ'9 }
&ijz'Sg3 return unhooked;
SAP/jD$5]> }
w/|&N>ZOx T;6M UmyC BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|62` {+ {
fZiAl7b! BOOL bAdded=FALSE;
4l 67B]o for(int index=0;index<MAX_KEY;index++){
W3le)& if(hCallWnd[index]==0){
*(9Tl]w hCallWnd[index]=hWnd;
>9H^r\ HotKey[index]=cKey;
!|[rh,e] HotKeyMask[index]=cMask;
8?Zhh. bAdded=TRUE;
/3,/j)`a KeyCount++;
Q^b& break;
6?a`'& }
A-!e$yz> }
sh
:$J[ return bAdded;
h%/BZC^L]| }
ed6@o4D/kf `*s:[k5k BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V_h&9]RL {
,ua1sTgQ BOOL bRemoved=FALSE;
D0Q9A]bD; for(int index=0;index<MAX_KEY;index++){
JLu$1A@ ' if(hCallWnd[index]==hWnd){
rqjq}L ) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
g<Z :`00| hCallWnd[index]=NULL;
R/=rNUe HotKey[index]=0;
Ll]5u~ HotKeyMask[index]=0;
CXq[VYM&X bRemoved=TRUE;
81Z;hO"~ KeyCount--;
>ai,6! break;
*L^W[o }
x?L[*N_ml }
@1*^ttC }
%n| return bRemoved;
2 5 \S> }
x_Ev2
c'4 I
Cc{ 2l void VerifyWindow()
@}
Ig*@ {
BgXZr,? for(int i=0;i<MAX_KEY;i++){
RRja{*R if(hCallWnd
!=NULL){ fOi
Rstci
if(!IsWindow(hCallWnd)){ a&'9[9E1
hCallWnd=NULL; xX&B&"]5
HotKey=0; KZ 5%q.
HotKeyMask=0; d]0:r]e
KeyCount--; h7#\]2U$[5
} <q7o"NI6FZ
} _*AI1/>`
} %Xh}{ o$G
} |u>V>
PN
v.]{b8RR
BOOL CHookApp::InitInstance() $5XAS
{ ,-6Oma
-
AFX_MANAGE_STATE(AfxGetStaticModuleState()); :|bL2T@>[
hins=AfxGetInstanceHandle(); vm@V5oH
InitHotkey(); %6[,a
return CWinApp::InitInstance(); Tf3CyH!k
} mOJdx-q?r
~9]vd|
int CHookApp::ExitInstance() s~7a-J
{ DXf
VerifyWindow(); "1,*6(;:
UnInit(); #&.Znk:@.f
return CWinApp::ExitInstance(); ?;l@yx
} "lt <$.
L -Q8iFW'
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Q^ W,)%
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @g#5d|U);
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <{W{
Y\_A>
#if _MSC_VER > 1000 N[cIr{XBGN
#pragma once ! t!4CY
#endif // _MSC_VER > 1000 kEh\@x[
ykC3Z<pI.
class CCaptureDlg : public CDialog ~R;/u")@e
{ U$5x#{AFp
// Construction 2B4.o*Q\
public: {H/%2
BOOL bTray; pEwo}NS*H
BOOL bRegistered; Mst%]@TG
BOOL RegisterHotkey(); ir6aV|ea!
UCHAR cKey; ?q`i
MiN
UCHAR cMask; vEfj3+e
void DeleteIcon(); 5ih>x3S1/
void AddIcon(); !Q"L)%)'A
UINT nCount; -Y524
void SaveBmp(); }aOqoi7w
CCaptureDlg(CWnd* pParent = NULL); // standard constructor .'=S1|_(
// Dialog Data Sqi9'-%m
//{{AFX_DATA(CCaptureDlg) 7@"X?uo%o
enum { IDD = IDD_CAPTURE_DIALOG }; ^1 ){
@(
CComboBox m_Key; uzxwJs'fz
BOOL m_bControl; = 9Yfo,F
BOOL m_bAlt; fuj9x;8X0
BOOL m_bShift; L--
t(G
CString m_Path; 9"^ib9M
CString m_Number; ,esEh5=Ir
//}}AFX_DATA [CEV&B
// ClassWizard generated virtual function overrides "3VX9{'%@
//{{AFX_VIRTUAL(CCaptureDlg) -n7@r
public: D zD5n
virtual BOOL PreTranslateMessage(MSG* pMsg); .iV=ybMT
protected: -o~zb-E
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J3y_JoS
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); uNI&U7_"
//}}AFX_VIRTUAL $Z;8@O3
// Implementation s=)W
protected: 5
Y&`Z J
HICON m_hIcon; Pt85q?- >
// Generated message map functions Hx6ODj[-
//{{AFX_MSG(CCaptureDlg) B{\Y~>]Pj
virtual BOOL OnInitDialog(); E"*E[>
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S$SCW<LuN
afx_msg void OnPaint(); n=j)M
afx_msg HCURSOR OnQueryDragIcon(); K^o$uUBe
virtual void OnCancel(); ?8$`GyjS
afx_msg void OnAbout(); 3~fi#{
afx_msg void OnBrowse(); :JSxsA6k
afx_msg void OnChange(); 3F"vK
//}}AFX_MSG ;q'-<O
DECLARE_MESSAGE_MAP() D,=~7/g
}; 8\;, d
#endif "yH?df24
!r.-7hR $
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D'[:35z
#include "stdafx.h" wDi/oH/H
#include "Capture.h" vKnZ= =B
#include "CaptureDlg.h" *JImP9SE
#include <windowsx.h> mD>
J,E
#pragma comment(lib,"hook.lib") f-#:3k*7S
#ifdef _DEBUG PI L)(%X
#define new DEBUG_NEW vFHeGq70j
#undef THIS_FILE |};d:LwX
static char THIS_FILE[] = __FILE__; #qVvh3#g
#endif w &YUb,{Y
#define IDM_SHELL WM_USER+1 ?J6Ek*E#
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #NyO'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B tznms'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5 `TMqrk
class CAboutDlg : public CDialog M>=@Z*u/+
{ rbOJ;CK
public: j8M t"B
CAboutDlg(); `~\SQ EY$
// Dialog Data ]4B;M Ym*
//{{AFX_DATA(CAboutDlg) hfJ&o7Dt
enum { IDD = IDD_ABOUTBOX }; 9q0s
//}}AFX_DATA x]YzVJ =Y
// ClassWizard generated virtual function overrides b,:^\HKC
//{{AFX_VIRTUAL(CAboutDlg) VS4Glx73
protected: .qe+"$K'n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [3=Y 9P:
//}}AFX_VIRTUAL ,l!>+@
// Implementation An>ai N]
protected: +D
@B eQu
//{{AFX_MSG(CAboutDlg) -`ljKp
//}}AFX_MSG EyR/
DECLARE_MESSAGE_MAP() vg?(0Gasm*
}; 6{d?3Jk
>4bw4
Z1
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X`<z5W] !
{ \="U|LzG
//{{AFX_DATA_INIT(CAboutDlg) :BR_%$
//}}AFX_DATA_INIT O6e$v I@
} J|jvqt9C
% dFz[b
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a(IE8:yU`
{ tMdSdJ8
CDialog::DoDataExchange(pDX); V1P]pP
//{{AFX_DATA_MAP(CAboutDlg) ?$)a[UnqX
//}}AFX_DATA_MAP <9H3d7%
} JkR%o
#>5
noaR3)
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) MYV3</Xj*
//{{AFX_MSG_MAP(CAboutDlg) ~:,}?9
// No message handlers _Cf:\Xs
m
//}}AFX_MSG_MAP nGTGX
END_MESSAGE_MAP() Ax|'uvVAPT
I`xC0ZUKj
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) **-rPonM[
: CDialog(CCaptureDlg::IDD, pParent) UazK0{t<f
{ RJ3uu NK7
//{{AFX_DATA_INIT(CCaptureDlg) 8|=
c3Z
m_bControl = FALSE; =KO]w9+\
m_bAlt = FALSE; KiMlbF.~V
m_bShift = FALSE; *eD[[HbKX
m_Path = _T("c:\\"); l %zbx"%x
m_Number = _T("0 picture captured."); nQ'NS
nCount=0; sBWyUD
bRegistered=FALSE; HQF@@
bTray=FALSE; oFyB-vpYQV
//}}AFX_DATA_INIT "Cvr("'O
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;L",K?6#
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); D:K"J><@
} 0zr%8Q(Q
8T+o.w==
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >8{{H"$;(
{ bCTN^
CDialog::DoDataExchange(pDX); 3P75:v
//{{AFX_DATA_MAP(CCaptureDlg) O|Vc
DDX_Control(pDX, IDC_KEY, m_Key); D\ZH1C!d
DDX_Check(pDX, IDC_CONTROL, m_bControl); Tw%1m
DDX_Check(pDX, IDC_ALT, m_bAlt); z+M{zr
DDX_Check(pDX, IDC_SHIFT, m_bShift); l`6.(6
DDX_Text(pDX, IDC_PATH, m_Path); 5`}za-
DDX_Text(pDX, IDC_NUMBER, m_Number); O)R}|
//}}AFX_DATA_MAP Y]~-S
}
;j~%11
]n@T5*=
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 82)=#ye_P
//{{AFX_MSG_MAP(CCaptureDlg) X ?ZLmP7|
ON_WM_SYSCOMMAND() c#u_%*
ON_WM_PAINT() B(FM~TVZ
ON_WM_QUERYDRAGICON() <7T}b95
ON_BN_CLICKED(ID_ABOUT, OnAbout) ;9#W#/B
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Nz"K`C>/
ON_BN_CLICKED(ID_CHANGE, OnChange) %c$|.TkX
//}}AFX_MSG_MAP `o9:6X?RA
END_MESSAGE_MAP() @ZYJY
9;n*u9<
BOOL CCaptureDlg::OnInitDialog() 1W.oRD&8j/
{ .`u8(S+
CDialog::OnInitDialog(); q|klsup
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); kwww5p ["
ASSERT(IDM_ABOUTBOX < 0xF000); ^v5]Aq~X
CMenu* pSysMenu = GetSystemMenu(FALSE); Wd+kjI \
if (pSysMenu != NULL) usK P9[T$
{ DIP%*b#l$\
CString strAboutMenu; nT~XctwF
strAboutMenu.LoadString(IDS_ABOUTBOX); MdEds|D
if (!strAboutMenu.IsEmpty()) K}n.k[Do
{ K5<2jl3S
pSysMenu->AppendMenu(MF_SEPARATOR); it>Bf;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); y%
!.:7Y
} u46Z}~xf b
} -d2)
SetIcon(m_hIcon, TRUE); // Set big icon 7Kj7or|
SetIcon(m_hIcon, FALSE); // Set small icon 4!3<[J;N;
m_Key.SetCurSel(0); <AJRU
l
RegisterHotkey(); 4S+E%b|)
CMenu* pMenu=GetSystemMenu(FALSE); pP# _B
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); EHl~y=9
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0.PG]K6
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); xe.f]a
return TRUE; // return TRUE unless you set the focus to a control 1NTx?JJfW
} rHybP6C<
l7<VH z0b
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dB&<P[$+8
{ FKe/xz
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,T^A?t
{ DqI "B
CAboutDlg dlgAbout; "9X(.v0ze
dlgAbout.DoModal(); I"8Z'<|/\q
} ~rq:I<5
else Xmb##:
{ Jp8,s%
CDialog::OnSysCommand(nID, lParam); I@Yk &aU
} fS8Pi,!
} V'za,.d-
xrlyph5mE
void CCaptureDlg::OnPaint() (Xzq(QV
{ EronNtu8i
if (IsIconic()) X=Y(,ZR(&
{ o8A8fHl
CPaintDC dc(this); // device context for painting wvxqgXnB\
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); KB~`3Wj|Z
// Center icon in client rectangle *ni0.
int cxIcon = GetSystemMetrics(SM_CXICON); yk^2<?z>2
int cyIcon = GetSystemMetrics(SM_CYICON); #K` [XA
CRect rect; gC%$)4-:
GetClientRect(&rect); cdI"=B+C\
int x = (rect.Width() - cxIcon + 1) / 2; c>r~pY~$
int y = (rect.Height() - cyIcon + 1) / 2; b;vVlIG
// Draw the icon 2>J;P C[;
dc.DrawIcon(x, y, m_hIcon); 9Ns%<FRO@
} ;_ 1Rk&o!
else |<1A<fU8a
{ hr&UD| E=
CDialog::OnPaint(); "cOBEhn%l
} vZ6R>f
} P $r!u%W
J!Rqm!)q
HCURSOR CCaptureDlg::OnQueryDragIcon() LR4W
{ xvWP^Qkb
return (HCURSOR) m_hIcon; ,WoB)V.{(
} "79b>
>r4BI}8SK<
void CCaptureDlg::OnCancel() u2':~h?l
{ <I?f=[
if(bTray) =8]Ru(#Ig
DeleteIcon(); ne[H `7c
CDialog::OnCancel(); gA5DEit
} |llmq'Q
8H3O6ro
void CCaptureDlg::OnAbout() hO$29_^"
{ ,d
HAD
CAboutDlg dlg; 0G'v4Vj0'
dlg.DoModal(); tPw7zFy6r
} mEb`ET|
i!<(R$Lo
void CCaptureDlg::OnBrowse() 11!4#z6w
{ K)\D,5X^
CString str; d(5j#?
BROWSEINFO bi; p-z!i +
char name[MAX_PATH]; @}%kSn5y:
ZeroMemory(&bi,sizeof(BROWSEINFO)); OaByfo<S
bi.hwndOwner=GetSafeHwnd(); J3r':I}\
bi.pszDisplayName=name; JvJ)}d$,&
bi.lpszTitle="Select folder"; &Ci_wDJ
bi.ulFlags=BIF_RETURNONLYFSDIRS; {-|El}.M
LPITEMIDLIST idl=SHBrowseForFolder(&bi); _JKz5hSl
if(idl==NULL) {D]I[7f8Ev
return; N B8Yn\{B
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ZS&lXgo
str.ReleaseBuffer(); nXh<+7
m_Path=str; f\:I1y
if(str.GetAt(str.GetLength()-1)!='\\') *@YQr]~
;
m_Path+="\\"; 6iEA._y
UpdateData(FALSE); V%^d~^m,H
} 7=A @P
tg ~7^(s
void CCaptureDlg::SaveBmp() wA87|YK8*
{ K=P LOC5
CDC dc; Ml_!)b
dc.CreateDC("DISPLAY",NULL,NULL,NULL); "x3!F&
CBitmap bm; E/d\ebX|
int Width=GetSystemMetrics(SM_CXSCREEN); Hjy4tA7,l
int Height=GetSystemMetrics(SM_CYSCREEN); xfqu=z8X
bm.CreateCompatibleBitmap(&dc,Width,Height); ,` $2
CDC tdc; (<|1/^~=
tdc.CreateCompatibleDC(&dc); )9!J
$q
CBitmap*pOld=tdc.SelectObject(&bm); Y~OyoNu2
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7l'1
tdc.SelectObject(pOld); ?CpM.{{s
BITMAP btm; NL"w#kTc()
bm.GetBitmap(&btm); ;tZ 8Sh)
DWORD size=btm.bmWidthBytes*btm.bmHeight; {Q0DHNP(G
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);
Bf,}mCq
BITMAPINFOHEADER bih; z2dW)_fU$
bih.biBitCount=btm.bmBitsPixel; !:D,|k\m
bih.biClrImportant=0; 1n $
bih.biClrUsed=0; 9H%ixBnM
bih.biCompression=0; =mxj2>,&
bih.biHeight=btm.bmHeight; "W"r0"4
bih.biPlanes=1; 0B5d $0
bih.biSize=sizeof(BITMAPINFOHEADER); ]mi)x63^
bih.biSizeImage=size; ^;EwZwH[
bih.biWidth=btm.bmWidth; O(T6Y80pU
bih.biXPelsPerMeter=0; G?+]BIiL
bih.biYPelsPerMeter=0; ve*6WDK,H
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )U2%kmt
static int filecount=0; Z1DF )
CString name; &Qv%~dvW
name.Format("pict%04d.bmp",filecount++); sDy~<$l?
name=m_Path+name; )Mw 3ZE92
BITMAPFILEHEADER bfh; 7$:Jea
bfh.bfReserved1=bfh.bfReserved2=0; MV?sr[V-oP
bfh.bfType=((WORD)('M'<< 8)|'B'); +AOpB L'
bfh.bfSize=54+size; <)gTi759h)
bfh.bfOffBits=54; #XAH`L\
CFile bf; 7"{CBbT
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S`[r]msw
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); []H0{a2{<
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); z|N*Gs>,
bf.WriteHuge(lpData,size); CDFkH
bf.Close(); p?+;[!:
nCount++; p;vrPS
} c=IjR3F
GlobalFreePtr(lpData); PW-sF
if(nCount==1) M3q7{w*bM
m_Number.Format("%d picture captured.",nCount); fR lJ`\ t
else i,$n4
m_Number.Format("%d pictures captured.",nCount); xT8!X5;
UpdateData(FALSE); zvbz3 a
} EJTa~
S%w67sGl4n
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) OKNGV,{`
{ |Lz7}g=6
if(pMsg -> message == WM_KEYDOWN) .@f)#2
{ "(E%JAwZ^W
if(pMsg -> wParam == VK_ESCAPE) 2!Pwg0%2
return TRUE; 2{)<Df@
if(pMsg -> wParam == VK_RETURN) d|$-Sz
return TRUE; O}[){*GG=
} _jk+$`[9PL
return CDialog::PreTranslateMessage(pMsg); +L}R|ihkI
} G#z9=NF~V
hhr>nuA
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Um
I,?p
{ ; DI"9
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g_MxG!+(V
SaveBmp(); 2}#VB;B
return FALSE; -"n8Wv
} >
,P,{"
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f.U.(
CMenu pop; 7, :l\t
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :N:e3$c
CMenu*pMenu=pop.GetSubMenu(0); 2H`;?#Uq:
pMenu->SetDefaultItem(ID_EXITICON); vb k4
CPoint pt; :j%
B(@b
GetCursorPos(&pt); 7e<\11uI]a
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M0uC0\'#P
if(id==ID_EXITICON) X0%BE!
DeleteIcon(); Z-z(SKL
else if(id==ID_EXIT) &d[%
OnCancel(); 3+:uV
return FALSE; ltXGm)+
} N+ ei)-
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6)#%36rP
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) T04&Tl'CT
AddIcon(); 3-
4jSN\
return res; yI*h"?7T
} qyYf&VC}
{:BY
IdX
void CCaptureDlg::AddIcon() ~DK=&hCd!
{ ~=pyA#VVJ"
NOTIFYICONDATA data; Bd*\|M
data.cbSize=sizeof(NOTIFYICONDATA); Fk&A2C}$b
CString tip; hUMFfc?
tip.LoadString(IDS_ICONTIP); [$%0[;jtS
data.hIcon=GetIcon(0); \W})Z72
data.hWnd=GetSafeHwnd(); D$bJ s O
strcpy(data.szTip,tip); ^NOy:>
data.uCallbackMessage=IDM_SHELL; =zKbvwe%X
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F[U0TP@&*
data.uID=98; 29h_oNO
Shell_NotifyIcon(NIM_ADD,&data); fuA8jx
ShowWindow(SW_HIDE); gd\b]L?>O
bTray=TRUE; m_>~e}2'A
} T
^z Mm
O6r.q&U
void CCaptureDlg::DeleteIcon() ? 1b*9G%i
{ 8]0?mV8iOE
NOTIFYICONDATA data; eqWb>$
data.cbSize=sizeof(NOTIFYICONDATA); |:d:uj/
data.hWnd=GetSafeHwnd(); mi{ r7.e5I
data.uID=98; JWs?az
Shell_NotifyIcon(NIM_DELETE,&data); W|[k]A` 2
ShowWindow(SW_SHOW); G X>T~i\f8
SetForegroundWindow(); 3`Q>s;DjIU
ShowWindow(SW_SHOWNORMAL); +jz%:D
bTray=FALSE; t M{U6k
} -` e`U%n
[$(/H;
void CCaptureDlg::OnChange() >CPoeIHK
{ Pr^p
^s
RegisterHotkey(); 3+#
"4O
} +\`t@Ht#
h}(GOYS)
BOOL CCaptureDlg::RegisterHotkey() t%>x}b"2T
{ U})Z4>[bvt
UpdateData(); [=I==?2`X
UCHAR mask=0; p9$=."5
UCHAR key=0; &T/}|3S
if(m_bControl) HA%r:Px
mask|=4; xDBHnr}[
if(m_bAlt) q5(Z
mask|=2; Q\<^ih51
if(m_bShift) }x}JzA+2
mask|=1; Oe%jV,S |V
key=Key_Table[m_Key.GetCurSel()];
I`}<1~ue
if(bRegistered){ Qz?r4kR
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4 '-GcH
bRegistered=FALSE; VNLggeX'U
} n`)wD~mk
cMask=mask; Zr@G
cKey=key; W&(98}oT
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rSfvHO:R
return bRegistered; O1K~]Nt
} #>byP?)n
{^n\
r^5
四、小结 0NWtu]9QC
cxQ8/0^
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。