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:
b>N)H
89I[Dg;"u 一、实现方法
9Fe(],AzF ?
x1"uH 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:
^*;{Uj+O~Y G;:D6\ #pragma data_seg("shareddata")
^y@RfM=A HHOOK hHook =NULL; //钩子句柄
~<M/<%o2* UINT nHookCount =0; //挂接的程序数目
sGNVZx static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
dg%Orvuz static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
us&!%` static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
_9Pxtf static int KeyCount =0;
wi#]*\N\9 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-*[?E!F
#pragma data_seg()
=AFTB<7-^ b\/:-][ 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。
)4d)G5{ t6.hg3Y 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:
j8@Eqh l@+WGh BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
jB8n\8Bs cKey,UCHAR cMask)
`={s*^Ta {
zNE"5 BOOL bAdded=FALSE;
;(). for(int index=0;index<MAX_KEY;index++){
FHNK%Ko if(hCallWnd[index]==0){
zw{cli&S hCallWnd[index]=hWnd;
#1MEmt HotKey[index]=cKey;
,2F4S5F~rC HotKeyMask[index]=cMask;
8^fkY'x bAdded=TRUE;
9N9dQ}[:g KeyCount++;
0phO1h]2S) break;
} z4=3' }
UOn
L^Z} }
qp(F}@ return bAdded;
*}9i@DP1, }
q&IO9/[dk //删除热键
20hF2V BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sSLs%)e|: {
c5uT'P" BOOL bRemoved=FALSE;
{}?;|&_ for(int index=0;index<MAX_KEY;index++){
0A%>'< if(hCallWnd[index]==hWnd){
Gt&x< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
C;DNL^ hCallWnd[index]=NULL;
=d/\8\4 HotKey[index]=0;
kl.)A-6V HotKeyMask[index]=0;
M\wIpRD, bRemoved=TRUE;
aq[ ;[$w KeyCount--;
k^q}F%UV break;
Jji~MiMn }
dhe?7r]u }
9wP_dJvb }
7s%DM6li 6 return bRemoved;
C24[brf }
gY AXUM, .p%p _ ..qAE.%% DLL中的钩子函数如下:
} d /5_X rs01@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,63hO.4M {
t&UPU&tY BOOL bProcessed=FALSE;
/#Y)nyE
if(HC_ACTION==nCode)
pv2_A {
.xT8@] if((lParam&0xc0000000)==0xc0000000){// 有键松开
s)$N&0\ switch(wParam)
-Iz&/u*}f {
EAQg4N:D7L case VK_MENU:
7%Zl^c>q MaskBits&=~ALTBIT;
4!Ez#\ break;
wiWpzJz case VK_CONTROL:
s8| =1{ MaskBits&=~CTRLBIT;
so|5HR| break;
uX{n#i,~L case VK_SHIFT:
N> RabD MaskBits&=~SHIFTBIT;
MnvFmYgxA break;
ZF
:e6em default: //judge the key and send message
mj0{Nd break;
N9r}nqCN }
:+ef|,:`/ for(int index=0;index<MAX_KEY;index++){
lkf(t&vL2 if(hCallWnd[index]==NULL)
.gNWDk0$Y continue;
JGPLVw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>=hOjV; {
UhCE.#
U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
eR r.j bProcessed=TRUE;
0$3\DS<E }
QRj><TKi }
{aI8p}T }
r]eeKV,{p else if((lParam&0xc000ffff)==1){ //有键按下
>9c$2d|> switch(wParam)
]!J 6S.@#+ {
@SA*7[?P case VK_MENU:
PF@+~FI MaskBits|=ALTBIT;
vS-k0g; break;
._m+@Uy]H} case VK_CONTROL:
O=}4?Xv MaskBits|=CTRLBIT;
'~i}2e. break;
wZVY h case VK_SHIFT:
P0J3ci}^ MaskBits|=SHIFTBIT;
BP2-LG&\ break;
<va3L y)c& default: //judge the key and send message
I0 a,mO;m break;
v8"plx=3 }
\P]w^ for(int index=0;index<MAX_KEY;index++){
Ev;HV}G if(hCallWnd[index]==NULL)
}f)$+mi continue;
hoI?,[@F if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$X_JUzb {
@-bX[}. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_^Lv8a3(O bProcessed=TRUE;
][-N< }
Go3EWM`Cd8 }
}}XYV eI }
e Ll+F%@ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
|ofegO}W7 for(int index=0;index<MAX_KEY;index++){
-x2/y:q ` if(hCallWnd[index]==NULL)
5k.NZ continue;
eRQ}`DjTk if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7
Xe|P1@) SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0Vv6B2< //lParam的意义可看MSDN中WM_KEYDOWN部分
trmCIk&Fkj }
lk{ }
XnrOC|P$ }
D/jB. return CallNextHookEx( hHook, nCode, wParam, lParam );
G?!b00H }
`HvU_ja; c%v[p8
% 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:
GHeJpS jr{C/B} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
egboLqn BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
@\v, /2-S/,a 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:
v!?bEM3D H];|<G LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
R*IO%9O {
Qj~m;F! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
mdvooJ {
LziEF-_ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
WS8m^~S@\ SaveBmp();
<jF]SN return FALSE;
cc7*O }
^D\1F$AjC …… //其它处理及默认处理
xc[@lr }
YLVV9( 9tsI1]1[m fv_}7t7 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
{]<l|qK zu'Uau 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
wEENN_w o9G%KO&;D, 二、编程步骤
L ^} Z:I 0F-X.Dq 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
1C\OL!@L D_
xPa 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
!TY9\8JzV |t*(]U2O0 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
t
m?[0@<s y:(OZ%g 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
;vvO#3DWM pC
l[DE 5、 添加代码,编译运行程序。
,80qwN, /e :V44 三、程序代码
>f #P( w~a^r]lPW ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
PVHJIB #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
*LpEH,J #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
>_P7 k5Y^ #if _MSC_VER > 1000
D-e0q)RSU #pragma once
\$YKw0K #endif // _MSC_VER > 1000
6M9t<DQV #ifndef __AFXWIN_H__
k\$))<3 #error include 'stdafx.h' before including this file for PCH
,d n9tY3 #endif
^%|,G:r #include "resource.h" // main symbols
OQMkpX-dH class CHookApp : public CWinApp
I&~kwOP {
\Zz"%i public:
0 3fCn" CHookApp();
j_*$Avy // Overrides
JP`$A // ClassWizard generated virtual function overrides
&C<K|F!j! //{{AFX_VIRTUAL(CHookApp)
cHOtMPyQ public:
MTo<COp($ virtual BOOL InitInstance();
nmZz`P9g virtual int ExitInstance();
<<`*o[^L //}}AFX_VIRTUAL
:;W[@DeO[ //{{AFX_MSG(CHookApp)
B.CUk. // NOTE - the ClassWizard will add and remove member functions here.
xF:
O6KL // DO NOT EDIT what you see in these blocks of generated code !
&<6E*qM //}}AFX_MSG
*,<A[XP DECLARE_MESSAGE_MAP()
vdw5T&Q{{C };
z<aB GG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
tJ[yx_mf BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l+!!S"=8)~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
KBJw7rra BOOL InitHotkey();
pSp/Qpb-B BOOL UnInit();
DhZuQpH #endif
VZo[\sWf ,Oa-AF/p //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
stuj,8 #include "stdafx.h"
>QO^h<.> #include "hook.h"
)3# gpM #include <windowsx.h>
}U3+xl6g #ifdef _DEBUG
sC
>_ulkoa #define new DEBUG_NEW
[ZC]O2' #undef THIS_FILE
ir/m.~? static char THIS_FILE[] = __FILE__;
-F=?M+9[ #endif
VuA7rIF$66 #define MAX_KEY 100
rD=8O#m
g #define CTRLBIT 0x04
WLl_;BgN #define ALTBIT 0x02
q1ybJii #define SHIFTBIT 0x01
"%fh`4y3\ #pragma data_seg("shareddata")
0/K?'&$yvb HHOOK hHook =NULL;
u3 k% UINT nHookCount =0;
<knf^D<" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
$/;D8P5/&= static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
_5TSI'@.4 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
V/|).YG2 static int KeyCount =0;
:T^!<W4 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
wK OljE6d #pragma data_seg()
_:@~bHd HINSTANCE hins;
yUV0{A-q{0 void VerifyWindow();
F5UvD[i BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
]v^/c~"${ //{{AFX_MSG_MAP(CHookApp)
fy+fJ )4sj // NOTE - the ClassWizard will add and remove mapping macros here.
mdjPKrF< // DO NOT EDIT what you see in these blocks of generated code!
&*2\1;1tB //}}AFX_MSG_MAP
biAI*t END_MESSAGE_MAP()
AsFn%8_I _CqVH5U? CHookApp::CHookApp()
_8t5rF {
I5]=\k($ // TODO: add construction code here,
1o"/5T:S[ // Place all significant initialization in InitInstance
|vW(;j6 }
.{+KKa $@G xz2U?)m;x CHookApp theApp;
9V&}% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
PdiP5S }/ {
.T~<[0Ex+U BOOL bProcessed=FALSE;
=k.:XblEe[ if(HC_ACTION==nCode)
MKVz'-`u {
?bFP'. if((lParam&0xc0000000)==0xc0000000){// Key up
iMG)zPj switch(wParam)
%smQ`u| {
^(z7?T case VK_MENU:
vJZ0G:1 MaskBits&=~ALTBIT;
8vQGpIa, break;
\H<gKZquR case VK_CONTROL:
>,c$e' h MaskBits&=~CTRLBIT;
- 7MR2)U break;
^n8ioL\*i case VK_SHIFT:
AI
KLJvte MaskBits&=~SHIFTBIT;
-& Qm"-?: break;
t^_0w[ default: //judge the key and send message
V{!fag break;
#yNSQd }
Br/qOO:n$} for(int index=0;index<MAX_KEY;index++){
u.v
5!G if(hCallWnd[index]==NULL)
_N8Tu~lqV continue;
*R9s0;&: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G!]%xFwYa {
,RmXZnWY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
h>Z NPP8N bProcessed=TRUE;
Oi#4|*b{W }
]vj.s/F~ }
758`lfz=_ }
nW)-bAV< else if((lParam&0xc000ffff)==1){ //Key down
=^liong0 switch(wParam)
'Br:f_} {
0$=Uhi
case VK_MENU:
?O(@BT MaskBits|=ALTBIT;
BR&T,x/d break;
]5(T{ case VK_CONTROL:
_#[~?g` MaskBits|=CTRLBIT;
SCwAAE9s] break;
RF3?q6j , case VK_SHIFT:
pypW MaskBits|=SHIFTBIT;
5>9KW7^L break;
i4<&zj}) default: //judge the key and send message
-,xCUG<g break;
:Y? L* }
;8F|Q<`pV for(int index=0;index<MAX_KEY;index++)
/zt9;^e {
\9;SOA v if(hCallWnd[index]==NULL)
vjo@aY.x continue;
j^4KczJl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zk6al$3R {
RYhaQ&1i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
R%gkRx[
bProcessed=TRUE;
I+JWDYk }
E lf'1 }
q%H`/~AYM }
(CUrFZT$ if(!bProcessed){
1Yr&E_5/ for(int index=0;index<MAX_KEY;index++){
N5W;Zx] if(hCallWnd[index]==NULL)
yH`4sd continue;
NO$n-<ag if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ZtzSG@f SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
1zo0/<dk }
3C:!\R }
^3>Qf }
N=2BrKb)o return CallNextHookEx( hHook, nCode, wParam, lParam );
rw CFt6;v }
rbC4/ 9G\ !T+jb\O_ BOOL InitHotkey()
cL+--$L {
ywQ>T+ if(hHook!=NULL){
4}i2j nHookCount++;
qcN{p7=0 return TRUE;
]lBe }
~*R:UTBtw else
s,5SWdb\v hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
(~59}lu~ if(hHook!=NULL)
:S['hBMN nHookCount++;
ioIOyj return (hHook!=NULL);
Drn{ucIs }
Kmk}Yz BOOL UnInit()
kzky{0yKk= {
Fe: M'. if(nHookCount>1){
Cx
N]fo nHookCount--;
G,jv Mb`+ return TRUE;
w)Rtt 9 }
|_<'qh BOOL unhooked = UnhookWindowsHookEx(hHook);
d3nx"=Cy0I if(unhooked==TRUE){
t=-t xnlr< nHookCount=0;
nqp:nw hHook=NULL;
cImOZx }
jCJbmEfo9@ return unhooked;
<5Ye')+ }
os:/-A_m ] ^f7s36 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8|-j]
{
oK-T@ &- BOOL bAdded=FALSE;
MU
}<-1 for(int index=0;index<MAX_KEY;index++){
ywSV4ZtM if(hCallWnd[index]==0){
E$u9Jbe hCallWnd[index]=hWnd;
';'TCb{f * HotKey[index]=cKey;
K;n2mXYGM HotKeyMask[index]=cMask;
N }$$<i2o bAdded=TRUE;
\vH /bL KeyCount++;
G<F+/Oi&DX break;
E?VPCx }
0r4,27w }
&1=Je$, return bAdded;
rLkUIG }
9EPE.+ns v jTs[eq> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
YsX&]4vzm {
2yB@)?V/ BOOL bRemoved=FALSE;
5hhiP2q for(int index=0;index<MAX_KEY;index++){
S1Z~-i*w if(hCallWnd[index]==hWnd){
>e
g8zN if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
t)#dR._q hCallWnd[index]=NULL;
9/8#e+L HotKey[index]=0;
+*I'!)T^B HotKeyMask[index]=0;
uTWij4)a bRemoved=TRUE;
^)JUl!5j]C KeyCount--;
@ij8AGE: break;
oVD)Fb%[i9 }
u~uR:E%'C }
z%4E~u10 }
{Df97n%h; return bRemoved;
# }
1 #zIAN> b]-~{' + void VerifyWindow()
NmH1*w<A {
rE&`G[(b for(int i=0;i<MAX_KEY;i++){
T<jo@z1UL if(hCallWnd
!=NULL){ 8!R +wy
if(!IsWindow(hCallWnd)){ sp&s
5aw
hCallWnd=NULL; ;s^br17z~
HotKey=0; d`XC._%^J
HotKeyMask=0; CMcS4X9/}
KeyCount--; 34D7qR
} [!g$|
} vb&1 S
} =XRTeIZ
} tom1u>1n
gv6}GE
BOOL CHookApp::InitInstance() Zb \E!>V
{ vU4Gw4
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0mb|JoE(
hins=AfxGetInstanceHandle(); cC4 2b2+
InitHotkey(); GlVb |O"
return CWinApp::InitInstance(); / LH#
3
} @Sik~Mm_h
y ~PW_,
int CHookApp::ExitInstance() p)x*uqSd
{ H'2J! /V
VerifyWindow(); ,qj1"e
UnInit(); n#US4&uT4A
return CWinApp::ExitInstance(); 3 L:s5
} Y%OJ3B(n|
!,SGKLs.m
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ms(Z1ix^
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o4[
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ EgYM][:UU
#if _MSC_VER > 1000 M0B6v}^H
#pragma once LH:M`\(DL1
#endif // _MSC_VER > 1000 tx+KxOt9Y
A^%li^qz
class CCaptureDlg : public CDialog 4lb(qKea
{ B#A
.-nb
// Construction #"T< mM7
public: Ej[:!L
BOOL bTray; ORc20NFy7
BOOL bRegistered; v^;p]_c~2
BOOL RegisterHotkey(); nEG+TRZ)\
UCHAR cKey; 0\y{/P?I$
UCHAR cMask; fQ[&
^S$
void DeleteIcon(); [|vE*&:uO
void AddIcon(); y^ij u(
UINT nCount; LH@xr\^
void SaveBmp(); Z$X[x7e.
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'XbrO|%
// Dialog Data >u-6,[(5X*
//{{AFX_DATA(CCaptureDlg) K> rZJ[a
enum { IDD = IDD_CAPTURE_DIALOG }; P3W<a4 ==
CComboBox m_Key; ^zfO=XN
BOOL m_bControl; l%f&vOcd
BOOL m_bAlt; ].!^BYNht
BOOL m_bShift; eZck$]P(6H
CString m_Path; |riP*b
CString m_Number; fr19C%{
//}}AFX_DATA pA%Sybw+
// ClassWizard generated virtual function overrides +Cf
//{{AFX_VIRTUAL(CCaptureDlg) lMQ_S"
public: <*Ex6/j
virtual BOOL PreTranslateMessage(MSG* pMsg); |e%o
protected: -|FSdzvg
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @[2Go}VF
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b3vPGR
//}}AFX_VIRTUAL fOHgz,x=
// Implementation 1KI,/ H"SY
protected: ~{xm(p
HICON m_hIcon; Dp8`O4YC
// Generated message map functions O'WBO"
//{{AFX_MSG(CCaptureDlg) y8!#G-d5
virtual BOOL OnInitDialog(); lQq&tz,
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Eq\PSa=gz
afx_msg void OnPaint(); .boBo$f
afx_msg HCURSOR OnQueryDragIcon(); 'G#T 6B!
virtual void OnCancel(); ^p}S5,
afx_msg void OnAbout(); Q ,`R-?v
afx_msg void OnBrowse(); ULJV
afx_msg void OnChange(); Ch;wvoy
//}}AFX_MSG ov9+6'zya
DECLARE_MESSAGE_MAP() VJf|r#2
}; Uc[@]
#endif ?x\tE]
$oo`]R_
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file K8R}2K-Y
#include "stdafx.h" !Z}d^$
#include "Capture.h" CI}zu;4|
#include "CaptureDlg.h" 4H]~ ]?F&
#include <windowsx.h> lG>,&(
#pragma comment(lib,"hook.lib") !#[=,'Y
#ifdef _DEBUG `a+"[%
#define new DEBUG_NEW ;/79tlwq
#undef THIS_FILE er%D`VHe
static char THIS_FILE[] = __FILE__; )o;oOPT!
#endif `zw^ WbCO{
#define IDM_SHELL WM_USER+1 j}.,|7X
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }}Kjb
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P\nz;}nv
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; d$?sS9"8(
class CAboutDlg : public CDialog xl]1{$1M
{
!VzbNJ&'
public: +{5y,0R
CAboutDlg(); e{}oQK
// Dialog Data )<+t#5"
//{{AFX_DATA(CAboutDlg) d OYEl<!J
enum { IDD = IDD_ABOUTBOX }; zQ=c6xvm8
//}}AFX_DATA gd,3}@@SH
// ClassWizard generated virtual function overrides T!F0_<
//{{AFX_VIRTUAL(CAboutDlg) 5dNM:1VoE
protected: d8p<f+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M#CYDEB
//}}AFX_VIRTUAL c2o.H!>
// Implementation -yJ%G1R
protected: "N*bV
//{{AFX_MSG(CAboutDlg) dU"ca|u
//}}AFX_MSG iu$:_W_
DECLARE_MESSAGE_MAP() F^/b!)4X
}; !Y95e'f.x
L#>^R
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4]P5k6nV
{ ToXgl4:kd
//{{AFX_DATA_INIT(CAboutDlg) N,?4,+Hc-
//}}AFX_DATA_INIT Pf/_lBtL
} Ks>l=5~v|
~A-vIlGt!
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6oA2"!u^w
{ I%Yeq"5RB
CDialog::DoDataExchange(pDX); WW&agr
//{{AFX_DATA_MAP(CAboutDlg) +k<0:Fi
//}}AFX_DATA_MAP ^fq^s T.$
} v{44`tR
Mcfqo0T-
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5IJm_oy
//{{AFX_MSG_MAP(CAboutDlg) p\).zuEf.
// No message handlers `m_('N
//}}AFX_MSG_MAP z=[?&X]O9b
END_MESSAGE_MAP() 1<(('H
=K:)%Qh
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~_GW
: CDialog(CCaptureDlg::IDD, pParent) |~d8j'rt
{ TaqqEL
//{{AFX_DATA_INIT(CCaptureDlg) DKnlbl1^?
m_bControl = FALSE; _t7}ny[
m_bAlt = FALSE; sWKe5@-o0
m_bShift = FALSE; eJ"je@vvrK
m_Path = _T("c:\\"); f[s|<U^
m_Number = _T("0 picture captured."); gbvMS*KQz
nCount=0; rFLm!J]
bRegistered=FALSE;
O>tz;RU
bTray=FALSE; DN 0`vl{*
//}}AFX_DATA_INIT \|f3\4;!
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,l )7]p*X
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B ?%g@d-;
} O}Mu_edM
5z=.Z\M`8
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) :+?w>
{ NQu.%=
CDialog::DoDataExchange(pDX); (aUdPo8H^
//{{AFX_DATA_MAP(CCaptureDlg) d [f,Nu'
DDX_Control(pDX, IDC_KEY, m_Key); aJ3.D
DDX_Check(pDX, IDC_CONTROL, m_bControl); }c?W|#y`.o
DDX_Check(pDX, IDC_ALT, m_bAlt); *2^+QKDG
DDX_Check(pDX, IDC_SHIFT, m_bShift); S"Z.M _
DDX_Text(pDX, IDC_PATH, m_Path); 5oTj^W8M(
DDX_Text(pDX, IDC_NUMBER, m_Number); ;_dOYG1
//}}AFX_DATA_MAP TO5#iiM)
} (`cXS5R
PO@b9O
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J`d_=C?J
//{{AFX_MSG_MAP(CCaptureDlg) ah2L8jN"
ON_WM_SYSCOMMAND() /JGET
ON_WM_PAINT() (
C~ u.
ON_WM_QUERYDRAGICON() kes
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ON_BN_CLICKED(ID_ABOUT, OnAbout) C
&~s<tcn
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hYSzr-)
ON_BN_CLICKED(ID_CHANGE, OnChange) Pu0 <Clh
//}}AFX_MSG_MAP ~zO>Q4-k
END_MESSAGE_MAP() my+2@ln
f j:q>}V
BOOL CCaptureDlg::OnInitDialog() {W11+L{8
{ aUYq~E tj
CDialog::OnInitDialog(); $GJuS^@%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +LhV4@zC
ASSERT(IDM_ABOUTBOX < 0xF000); 1@<PcQBp
CMenu* pSysMenu = GetSystemMenu(FALSE); s%/x3anz=
if (pSysMenu != NULL) L}Rsg'U
{ {Lg]chJq?
CString strAboutMenu; ;%a
strAboutMenu.LoadString(IDS_ABOUTBOX);
HE{JiAf
if (!strAboutMenu.IsEmpty()) A3s-C+@X
{ HS@ EV iht
pSysMenu->AppendMenu(MF_SEPARATOR); E(p#Je|@[
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0@LC8Bz+'
} U.A:'9K,
} d9Uv/VGp
SetIcon(m_hIcon, TRUE); // Set big icon g5@P
SetIcon(m_hIcon, FALSE); // Set small icon ={G0p=~+,p
m_Key.SetCurSel(0); e$l*s/"0t
RegisterHotkey(); 8$~^-_>n/
CMenu* pMenu=GetSystemMenu(FALSE); &G$K.q
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Wo2W/{
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @aC9O9|~
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uFYcVvbT@
return TRUE; // return TRUE unless you set the focus to a control $,
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} e.Gjp{
,p)Qu%'
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 12o6KVV^x
{ ?8-ho0f0
if ((nID & 0xFFF0) == IDM_ABOUTBOX) (b#4Z
{ ,JqCxb9
CAboutDlg dlgAbout; B6-1q&
E /
dlgAbout.DoModal(); SSn{,H8/j
} )N3XbbV
else t b>At*tO
{ Y_=
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CDialog::OnSysCommand(nID, lParam); *b,4qMr
} h1Nd1h@-
} 60--6n
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void CCaptureDlg::OnPaint() Csf!I@}Z
{ _~.S~;o!b
if (IsIconic()) ]Ei*I}
{ z2U^z*n{
CPaintDC dc(this); // device context for painting MRN=-|fV^
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r?2J
// Center icon in client rectangle `
#; "
int cxIcon = GetSystemMetrics(SM_CXICON); &j?+%Y1n@
int cyIcon = GetSystemMetrics(SM_CYICON); HB*H%>L{"B
CRect rect; t_kRYdW 9
GetClientRect(&rect); Y+nk:9
int x = (rect.Width() - cxIcon + 1) / 2; ' '<3;
int y = (rect.Height() - cyIcon + 1) / 2; jT*?Z:U
// Draw the icon i)q8p
dc.DrawIcon(x, y, m_hIcon); E(!b_C&
} [=]LR9c4
else ,B1~6y\b
{ ?bGk%jjHXM
CDialog::OnPaint(); h|%a}])G)
} zGtv(gwk
} !rTkH4!_
})umg8s
HCURSOR CCaptureDlg::OnQueryDragIcon() ]{ir^[A6
{ Cs'<;|r(
return (HCURSOR) m_hIcon; O39f
} agd^ga3
D}~uxw;[^
void CCaptureDlg::OnCancel() !W/"Z!k
{ ^4Tf6Fw#
if(bTray) k!py*noy
DeleteIcon(); a: 2ezxP
CDialog::OnCancel(); _6.Y3+7I
} |_mN:(3
0y`r.)G
void CCaptureDlg::OnAbout() 9@>Q7AUCQ
{ nLY(%):(P
CAboutDlg dlg; +vIsYg*#2M
dlg.DoModal(); \:Q)X$6
} .`jYrW-k
?T)M z
q}
void CCaptureDlg::OnBrowse() >e!Y 63`
{ 6t4Khiwx
CString str; nL+y"O
BROWSEINFO bi; 6z2%/P-'
char name[MAX_PATH]; +!mEP>
ZeroMemory(&bi,sizeof(BROWSEINFO)); <UwYI_OX
bi.hwndOwner=GetSafeHwnd(); D"CU J?
bi.pszDisplayName=name; elz0t<V
bi.lpszTitle="Select folder"; #ri;{d^6
bi.ulFlags=BIF_RETURNONLYFSDIRS; m4?a'z"
LPITEMIDLIST idl=SHBrowseForFolder(&bi); qIwsK\^p
if(idl==NULL) 4q\&Mb3
return; Y=D\
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); yof8L WXx
str.ReleaseBuffer(); Nxr\Yey
m_Path=str; =wlPm5
if(str.GetAt(str.GetLength()-1)!='\\') JPM~tp?;<
m_Path+="\\"; :!wl/X
~
UpdateData(FALSE); *tfD^nctO
} vZ1?4hG
X#tCIyK,nV
void CCaptureDlg::SaveBmp() JHa\"h
{ :,V&P_
CDC dc; Jwpc8MQ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); %+oqAYm+s
CBitmap bm; Hu+GN3`sx^
int Width=GetSystemMetrics(SM_CXSCREEN); O9rA3qv
B
int Height=GetSystemMetrics(SM_CYSCREEN); sGx3O i
bm.CreateCompatibleBitmap(&dc,Width,Height); 5zz">-Q !
CDC tdc; >qZl
s'
tdc.CreateCompatibleDC(&dc); gxmY^"Jy
CBitmap*pOld=tdc.SelectObject(&bm); Xi;<O&+
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P=.~LZZ]89
tdc.SelectObject(pOld); 9.B gsV .
BITMAP btm; R>B6@|}?
bm.GetBitmap(&btm); h@dy}Id
DWORD size=btm.bmWidthBytes*btm.bmHeight; tLcw?aB
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); og&-P=4O
BITMAPINFOHEADER bih; zUq(bD
bih.biBitCount=btm.bmBitsPixel; &gcZ4gpH
bih.biClrImportant=0; 4 %V9
bih.biClrUsed=0; PMT}fg
bih.biCompression=0; 9"zp>VR
bih.biHeight=btm.bmHeight; xlH3t&i7
bih.biPlanes=1; :!JQ<kV
bih.biSize=sizeof(BITMAPINFOHEADER); mbns%%GJU
bih.biSizeImage=size; Tj+U:#!!~
bih.biWidth=btm.bmWidth; S]NT +XM
bih.biXPelsPerMeter=0; =#vJqA
bih.biYPelsPerMeter=0; _9'hmej
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qWJHb Dd
static int filecount=0; V''fmWo7
CString name; k*D8IB
name.Format("pict%04d.bmp",filecount++); 'Y/kF1,*
name=m_Path+name; &Q* 7
BITMAPFILEHEADER bfh; Zv(6VVj
bfh.bfReserved1=bfh.bfReserved2=0; Bru] ;%Qg%
bfh.bfType=((WORD)('M'<< 8)|'B'); ^^F 8M0k3
bfh.bfSize=54+size; A0OA7m:~4
bfh.bfOffBits=54; Eihy|p
CFile bf; "]|7%]
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7Ah
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); LTB
rg[X
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Bg}l$?S
bf.WriteHuge(lpData,size); BkP4.XRI
bf.Close(); ;*0nPhBw0>
nCount++; 2.vmZaKP
} CY.4 >,
GlobalFreePtr(lpData); 1Vc~Sa
if(nCount==1) _mJhY0Oc
m_Number.Format("%d picture captured.",nCount); 6s'n
r7'0
else YRMe<upo
m_Number.Format("%d pictures captured.",nCount); j{D tjV8
UpdateData(FALSE); m&s>Sn+
} )+ 'r-AF*
7 IJn9 b
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J*38GX+
{ \(--$9
if(pMsg -> message == WM_KEYDOWN) /pV N1Yt
{ 3D^cPkX
if(pMsg -> wParam == VK_ESCAPE) qHT73_R
return TRUE; } =Xlac_U
if(pMsg -> wParam == VK_RETURN) gAVD-]`
return TRUE; !cdY`f6x
} K-@\";whF
return CDialog::PreTranslateMessage(pMsg); "$D'gSoYe
} 'Lw8l `7
mn\A)RQ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %hlgLM
{ +TX4,"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ pjl>ZoOM
SaveBmp(); e7b MK<:r
return FALSE; uUV"86B_
} , &n"#
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ XE&h&v=>
CMenu pop; 9Ofls9]U
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aqWlX0+
CMenu*pMenu=pop.GetSubMenu(0); Djdd|Z+*{
pMenu->SetDefaultItem(ID_EXITICON); v??$z#1F3
CPoint pt; "Q:h[) a
GetCursorPos(&pt); ~ch%mI~
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }!?RB v'W
if(id==ID_EXITICON) wX_~H*m?
DeleteIcon(); "R=~-, ~
else if(id==ID_EXIT) k"C'8<T)'
OnCancel(); l}r 9kS
return FALSE; hg#O_4D
} 0S9~db
LRESULT res= CDialog::WindowProc(message, wParam, lParam); fFYoZ/\
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) OhMJt&s9P=
AddIcon(); a2ho+TwT
return res; Dv
L8}dz
} X;2LK!x;y
fms(_Q:R?
void CCaptureDlg::AddIcon() cA|vH^:
{ sOiM/}O]
NOTIFYICONDATA data; L[A?W
data.cbSize=sizeof(NOTIFYICONDATA); r;MFVj{
CString tip; aEh9za
tip.LoadString(IDS_ICONTIP); ||.Hv[
]V*
data.hIcon=GetIcon(0); Iqn
(NOq^[
data.hWnd=GetSafeHwnd(); 7!h>
< sx
strcpy(data.szTip,tip); ^\kH^
data.uCallbackMessage=IDM_SHELL; SH#*Lc
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -(>Ch>O
data.uID=98; ,,+4d :8$
Shell_NotifyIcon(NIM_ADD,&data); 8ICV"8(
ShowWindow(SW_HIDE); 6GPI
gPL,
bTray=TRUE; wW/q#kc
} X/90S2=P
c8Ud<M .
void CCaptureDlg::DeleteIcon() Zd%wX<hU"
{ V"'PA-z3
NOTIFYICONDATA data; pPag@L
data.cbSize=sizeof(NOTIFYICONDATA); gu%i|-}
data.hWnd=GetSafeHwnd(); k3nvML,bv
data.uID=98; .Gvk5Wn
Shell_NotifyIcon(NIM_DELETE,&data); , ,ng]&%i
ShowWindow(SW_SHOW); eV/oY1B]<
SetForegroundWindow(); Dte5g),R
ShowWindow(SW_SHOWNORMAL); HyOrAv
<
bTray=FALSE; q mv0 LU
} $evuL3GY#
j;7E+Yp
void CCaptureDlg::OnChange() ;,e16^\' &
{ NdSuOkwwt
RegisterHotkey(); m{?f,Q=u@
} yjMN>L'
deVnAu =
BOOL CCaptureDlg::RegisterHotkey() y+w,j]
{ @SpP"/)JY
UpdateData(); ZTz07Jt
UCHAR mask=0; ciiI{T[Z
UCHAR key=0; 9xhc:@B1J
if(m_bControl) V>,=%r4f
mask|=4; 'P" i9j
if(m_bAlt) 9=3DYCk/
mask|=2; hV0fkQ.|
if(m_bShift) 3+s$K(% I
mask|=1; pMy:h
key=Key_Table[m_Key.GetCurSel()]; "y&`,s5}
if(bRegistered){ 1^E5VG1[
DeleteHotkey(GetSafeHwnd(),cKey,cMask); {jmy:e2
bRegistered=FALSE; 3l41"5Fy&
} GGr82)E
cMask=mask; 2 \}J*0
cKey=key; %lWOW2~R
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); # Q,EL73;
return bRegistered; X<Z(,B
} 6hv.;n};
X?wZ7*'1
四、小结 zBTW&
Xa.8-a"hz
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。