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:
Tp.iRFFkP
@g` ,'r 一、实现方法
J;9QDrl` QRix_2+ 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:
[_B&7#3>7 ]fmfX #pragma data_seg("shareddata")
Nv#, s_hG HHOOK hHook =NULL; //钩子句柄
o*S $j Cf? UINT nHookCount =0; //挂接的程序数目
X Ow^"=Oa[ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
MPw7!G(qj static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
zb*4Nsda: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
FO3*[O static int KeyCount =0;
n]g,)m static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
i2c<q0u #pragma data_seg()
8?R_O}U \r&@3a.> 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
\?IwR]@y g#&##f DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
{N`<e>A]{ +=xRr?F BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
69w"$Vk cKey,UCHAR cMask)
[wxI
X {
;'+cT.cmH BOOL bAdded=FALSE;
z-E4-\a
for(int index=0;index<MAX_KEY;index++){
^vz@d+\Kd if(hCallWnd[index]==0){
\d`Sz
* hCallWnd[index]=hWnd;
=1?yS3 HotKey[index]=cKey;
q/G5aO* HotKeyMask[index]=cMask;
CzbNG^+ bAdded=TRUE;
+u)$o KeyCount++;
PA[Rhoit, break;
Gi2Ey37]O }
O/~^}8TLL }
.OUE'5e p return bAdded;
K?I&,t_*R }
x/^zNO\1 //删除热键
vG}oo BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
kV<)>Gs {
!Z)^c& BOOL bRemoved=FALSE;
1W7BN~p14 for(int index=0;index<MAX_KEY;index++){
w#b2iE+Bw if(hCallWnd[index]==hWnd){
\mGM#E if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
9D21e(7X hCallWnd[index]=NULL;
qa?y lR"kA HotKey[index]=0;
gWPa8q<b HotKeyMask[index]=0;
2J;CiEB bRemoved=TRUE;
+.uk#K0o KeyCount--;
'1nU[,Wj break;
|Q;1;QXd }
T`;M!-)2 }
V0(ABi:d }
1\kehCt return bRemoved;
u'."E7o# }
GC3L2C0)k 8B9zo& 4Fq}*QJ- DLL中的钩子函数如下:
.9QQ]fLs %q^]./3p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
0&~u0B{ {
SsZzYj.d BOOL bProcessed=FALSE;
-/?<@*n if(HC_ACTION==nCode)
'_Oprx {
bq]a8tSB if((lParam&0xc0000000)==0xc0000000){// 有键松开
{xH@8T$DX switch(wParam)
I-"{m/PEdg {
n5/Q)*e0'# case VK_MENU:
(v}: MaskBits&=~ALTBIT;
0rUf'S
?K break;
[l:.Q?? )| case VK_CONTROL:
Mr(3]EfgO MaskBits&=~CTRLBIT;
e:<>
Yq+ break;
uUs>/+ case VK_SHIFT:
.EwK>ro4 MaskBits&=~SHIFTBIT;
H'> break;
q4oZJ-` default: //judge the key and send message
ks$G6WC break;
5c8x:
e@ }
x
,W+:l9~s for(int index=0;index<MAX_KEY;index++){
sn%fE if(hCallWnd[index]==NULL)
kF .b) continue;
dPId=
w) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7(Kc9sJC%% {
%|>i2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`314.a6S bProcessed=TRUE;
,~#hHhR_ }
J)o%83// }
,?+yu6eLb }
`RRORzXoS else if((lParam&0xc000ffff)==1){ //有键按下
P9vROzXK switch(wParam)
[G*mQ@G9 {
;U&VPIX$ case VK_MENU:
rv:O|wZ MaskBits|=ALTBIT;
"5K:"m break;
^da-R;o] case VK_CONTROL:
(n\
cs$ MaskBits|=CTRLBIT;
%<t/xAge
break;
4y]*"(sQ; case VK_SHIFT:
tP-c>|cz MaskBits|=SHIFTBIT;
=_Rd0, break;
e<K=Q$U. default: //judge the key and send message
}{J8U2])k break;
}: e9\r) }
l<+k[@Vox for(int index=0;index<MAX_KEY;index++){
3Daq5(fLP if(hCallWnd[index]==NULL)
xmDwoLU continue;
m`~ Qr~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&0raa {
FmPF7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
H'2 =yhtVh bProcessed=TRUE;
^E^:=Q?'_ }
$ }53f'QjW }
al/~ }
Alz#zBGb if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
iKwVYL for(int index=0;index<MAX_KEY;index++){
9}N*(PI if(hCallWnd[index]==NULL)
x{E[qH_1Fm continue;
ln5On_Wm if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&BkNkb0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~gN'";1i //lParam的意义可看MSDN中WM_KEYDOWN部分
]CjODa }
e]QkZg2?Yn }
#~b9H05D }
`m5iZxhw return CallNextHookEx( hHook, nCode, wParam, lParam );
V.J%4&^X }
ZfU_4Pl-> @u^Ib33 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:
UWHC]V? Hg4Ut/0 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
@)B_e*6>' BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"<n{/x( DWAU8>c+ 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'l!u <IYt*vlm LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
4.8,&{w<m {
0^=S:~G if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
#qWEyb2UZ {
0:*$i(2 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
n2E2V<# SaveBmp();
hf[K\aAk return FALSE;
S`::f(e }
7j+.H/2 …… //其它处理及默认处理
t%)L8%Jr }
vzL>ZBeZ kQ + ]zO]*d=m 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
g!$
"CX%8 a
<3oyY' 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。
^P[*yf UxW~yk 二、编程步骤
7?Fl [FW$ ;.Kzc3yz} 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";
v[x`I; ?NL2|8 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
B~^\jRd" ^JTfRZ:a 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;
?@~FT1"6G f*Kipgp 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;
{1o=/& }V 1sY^C 5、 添加代码,编译运行程序。
0t) IWD fqcyCu7Ep 三、程序代码
hm&~6rB ZrTq)BZ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
thh, V #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
?F-,4Ox{/ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
1xw},y6T2 #if _MSC_VER > 1000
Z1Ms~tch #pragma once
:!%oQQO #endif // _MSC_VER > 1000
X**wRF #ifndef __AFXWIN_H__
R{T4AZ@,' #error include 'stdafx.h' before including this file for PCH
T/H*Bo*=5 #endif
.m<-)Kx #include "resource.h" // main symbols
\1tce`+ class CHookApp : public CWinApp
nP}/#Wy {
|aZ^K\yIF public:
{Z|C CHookApp();
/:S.("Unv // Overrides
eA!aUu // ClassWizard generated virtual function overrides
w:qwU\U>x //{{AFX_VIRTUAL(CHookApp)
.N%$I6w public:
|Oo
WGVc virtual BOOL InitInstance();
f~]5A%=cZ virtual int ExitInstance();
WYq, i}S //}}AFX_VIRTUAL
\UXQy{Ex //{{AFX_MSG(CHookApp)
wtZe\h // NOTE - the ClassWizard will add and remove member functions here.
Iv{}U\ u // DO NOT EDIT what you see in these blocks of generated code !
a@%FwfIu //}}AFX_MSG
CSs3l DECLARE_MESSAGE_MAP()
2W}RXqV< };
z.QW*rW9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
}%VHBkuc BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
1Ao"DxZHy7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"MyYu}AD BOOL InitHotkey();
1r;Q5[@ BOOL UnInit();
46mu,v #endif
"dA"N$ &oT]ycz% //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
tvd/Y|bV= #include "stdafx.h"
)&*&ZL0 #include "hook.h"
77)C`]0( #include <windowsx.h>
0hPm,H*Y] #ifdef _DEBUG
.9`.\v6R #define new DEBUG_NEW
[P
8e=; #undef THIS_FILE
a+]@$8+ static char THIS_FILE[] = __FILE__;
hRME;/r]X #endif
}@x0@sI9 #define MAX_KEY 100
o<x2,uT #define CTRLBIT 0x04
p}C3<[Nk #define ALTBIT 0x02
RlpW)\{j? #define SHIFTBIT 0x01
`/0FXb
8h #pragma data_seg("shareddata")
tf>?; HHOOK hHook =NULL;
C3D1rS/I UINT nHookCount =0;
~V(WD;Mk static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
k&9
b&-=fk static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
](^xA` static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
|`,%%p|T% static int KeyCount =0;
P,,@&*
: static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
IuRKj8J)o #pragma data_seg()
,UY],;ib HINSTANCE hins;
?:UDK? void VerifyWindow();
La9dFe-uu{ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
*`|F?wF //{{AFX_MSG_MAP(CHookApp)
`?~pk)<C]. // NOTE - the ClassWizard will add and remove mapping macros here.
,;UVQwY // DO NOT EDIT what you see in these blocks of generated code!
Qp{{OjD //}}AFX_MSG_MAP
'
R{ [Y) END_MESSAGE_MAP()
4SmhtC C]{43 CHookApp::CHookApp()
YrA#NTB_o {
+ -U7ogs // TODO: add construction code here,
^G=s<pp // Place all significant initialization in InitInstance
$=t&NM }
xaejG/'iK 7QzUw CHookApp theApp;
3.
Kh LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,LG6py&aT {
!MoGdI-<r[ BOOL bProcessed=FALSE;
IEHAPt' if(HC_ACTION==nCode)
)fv0H&g {
l\a 0 k4 if((lParam&0xc0000000)==0xc0000000){// Key up
2}t2k> switch(wParam)
TN(1oJ: {
W,}C*8{+ case VK_MENU:
wQDKv'zU1 MaskBits&=~ALTBIT;
1)H+iN|im/ break;
{i3]3V"Xp case VK_CONTROL:
`5Q0U%`W MaskBits&=~CTRLBIT;
{Dqf.w>t break;
N_Yop case VK_SHIFT:
sFMSH:5z MaskBits&=~SHIFTBIT;
Wcw$
Zv break;
/qEoiL### default: //judge the key and send message
B_nim[72 break;
| M4_@P }
9>%ti&_-jt for(int index=0;index<MAX_KEY;index++){
GVe[)R if(hCallWnd[index]==NULL)
BG/M3 continue;
j$siCsF if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
eNpGa0 eG {
Y0
Ta&TYZ0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*e!0ZB3J bProcessed=TRUE;
/{^Qup }
=rGjOb3+ }
vEk
jd# }
SVo:%mX else if((lParam&0xc000ffff)==1){ //Key down
U)o(}:5xF switch(wParam)
?x=;?7 {
LDx1@a|83 case VK_MENU:
+.:- : MaskBits|=ALTBIT;
&V:iy break;
gYw4YP0Gz case VK_CONTROL:
z`y!C3w< MaskBits|=CTRLBIT;
ilHZx2k break;
iO~3rWQ case VK_SHIFT:
<x *.M"6? MaskBits|=SHIFTBIT;
??Q'| r break;
tY~EB.% default: //judge the key and send message
~sx?aiO break;
fKb8)PDP }
Z`Rrv$M! for(int index=0;index<MAX_KEY;index++)
Nyip]VwMJ {
uPQ:}zL2 if(hCallWnd[index]==NULL)
^giseWR( continue;
'1_CMr if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>$j?2,Za(V {
}vgeQh-G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
DKp+ nq$ bProcessed=TRUE;
>hQeu1 ~W }
S=@.<gS }
yyW;VKN }
9(V12gn+lk if(!bProcessed){
}4b
4<Sm_h for(int index=0;index<MAX_KEY;index++){
a6cq0g[#z if(hCallWnd[index]==NULL)
5ro^<P0f** continue;
|
U) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
3A!`U6C( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
YzNSZJPD }
Btp 9v<" }
JvX]^t/} }
^}fc]ovV return CallNextHookEx( hHook, nCode, wParam, lParam );
CB]#`|f }
^{lcj Ii FeO BOOL InitHotkey()
PUZH[-:c {
NitsUg@< if(hHook!=NULL){
Cdg/wRje nHookCount++;
e:D8.h+&} return TRUE;
*")Req }
[|.IXdJ! else
=bgzl=A` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
_FR_6*C)5 if(hHook!=NULL)
6}4?,r nHookCount++;
?5-Y'(r return (hHook!=NULL);
K%iWUl; }
B|XrjI? BOOL UnInit()
lLhvpvT {
;+jz=9Q- if(nHookCount>1){
jkTC/9AE| nHookCount--;
v"ZNS return TRUE;
yK9:LXhf }
BQTZt'p BOOL unhooked = UnhookWindowsHookEx(hHook);
|Lf>Z2E if(unhooked==TRUE){
tqbYrF) nHookCount=0;
-|V1A[ hHook=NULL;
imw,Nb }
!1(*D*31 return unhooked;
Wg{ 9X#| }
m#w1?y)Z@X *Cf5D6=Q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Bl[4[N {
;\a?xtIy BOOL bAdded=FALSE;
F/p/&9 for(int index=0;index<MAX_KEY;index++){
[>--U)/ if(hCallWnd[index]==0){
lidVe]> hCallWnd[index]=hWnd;
r)<c
~\0 7 HotKey[index]=cKey;
AwnQ5-IR\ HotKeyMask[index]=cMask;
t^Z-0jH bAdded=TRUE;
k0r93xa KeyCount++;
b:B+x6M break;
4,EX2 }
^Mvgm3hg }
Ln+;HorZ] return bAdded;
;Qn)~b~ }
"{9^SPsp +%Z#!1u BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
uvG'Kx {
c o 8bnH BOOL bRemoved=FALSE;
0nr5(4h for(int index=0;index<MAX_KEY;index++){
nMM:Tr if(hCallWnd[index]==hWnd){
~cr##Ff5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(}B3df hCallWnd[index]=NULL;
E)>.2{]C> HotKey[index]=0;
okm
}%#| HotKeyMask[index]=0;
O}s Mqh bRemoved=TRUE;
Q Uy7Q$W KeyCount--;
i8w/a break;
~cv322N }
?i{/iH~Sf }
p C^=?!:U }
Phq"A[4=O return bRemoved;
CKE):kHu }
MD98N{+[| E4N/or void VerifyWindow()
DbWaF5\yD {
1VKu3 for(int i=0;i<MAX_KEY;i++){
"%(SLQOyy if(hCallWnd
!=NULL){ Lm&BT)*
if(!IsWindow(hCallWnd)){ l4bLN
hCallWnd=NULL; po9f[/s'+o
HotKey=0; _.%U}U
HotKeyMask=0; ^V}c8 P|
KeyCount--; ]A=yj@o$xN
} 8/vGA=
} *Z8qd{.$q
} Uee(1
} P9
w);jp;
d%Ls'[Y^_0
BOOL CHookApp::InitInstance() c/lT S
{ T{So2@_&
AFX_MANAGE_STATE(AfxGetStaticModuleState()); yQcIfl]f
hins=AfxGetInstanceHandle(); u']}Z%A9`
InitHotkey(); %ZsdCQc{`
return CWinApp::InitInstance(); :y.~IQN
} Y'y
yrn}
8|L;y[v
int CHookApp::ExitInstance() 7!F -.kG
{ KwHlpW*
VerifyWindow(); XvSng"f.
UnInit(); icK$W2<8mg
return CWinApp::ExitInstance(); H-,p.$3}
} y[{}124
~2;\)/E\
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file G\z5Ue*
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8kLHQ0pmu
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QXu[<V
#if _MSC_VER > 1000 V]Rt[l]
#pragma once |b4f3n
#endif // _MSC_VER > 1000 Skg}/Ek
+!Q*ie+q
class CCaptureDlg : public CDialog _v[gJ(F
{ <2af&-EGs
// Construction -}1TT@
public: MWv(/_b
BOOL bTray; dY{qdQQ}
BOOL bRegistered; 8 =oUE$9
BOOL RegisterHotkey(); )g?ox{Hol
UCHAR cKey; k:F{U^!p|
UCHAR cMask;
RnSll-
void DeleteIcon(); p\P)
void AddIcon(); UHgW-N"
UINT nCount; Pcjrv:0$
void SaveBmp(); 7,s5Gd-
CCaptureDlg(CWnd* pParent = NULL); // standard constructor LAFxeo
// Dialog Data 2>[xe
//{{AFX_DATA(CCaptureDlg) <naxpflom0
enum { IDD = IDD_CAPTURE_DIALOG }; E!RlH3})
CComboBox m_Key; 99tUw'w
BOOL m_bControl; ix hF,F
BOOL m_bAlt; 4T]A!
y{
BOOL m_bShift; Y(u`K=*
CString m_Path; 9;Q|"
T
CString m_Number; VAo`R9^D#
//}}AFX_DATA 2bOl`{x
// ClassWizard generated virtual function overrides aoQ$"PF9
//{{AFX_VIRTUAL(CCaptureDlg) ejia4(Cd
public: H$V`,=H
virtual BOOL PreTranslateMessage(MSG* pMsg); dT0>\9ZNr
protected: j#Qnu0D
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ik](k"1{
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f/QwXO-U
//}}AFX_VIRTUAL ^T#jBqe
// Implementation W&k@p9
protected: :uJHFF xg
HICON m_hIcon; 9}_'
// Generated message map functions i;atYltEJ2
//{{AFX_MSG(CCaptureDlg) &e78xtA{
virtual BOOL OnInitDialog(); X~cdM1z?
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j#U,zsv:
afx_msg void OnPaint(); .D*~UI
afx_msg HCURSOR OnQueryDragIcon(); +eO>> ~Z
virtual void OnCancel(); "Zy:q'`o
afx_msg void OnAbout(); jK".iqx2L
afx_msg void OnBrowse(); v>HOz\F
afx_msg void OnChange(); YG /@=Z.
//}}AFX_MSG n.i8?:
DECLARE_MESSAGE_MAP() .SLpgYFL{
}; (xE |T f
#endif /M JI^\CA
/~Bs5f.]?
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file MsZx 0]
#include "stdafx.h" 4JyA+OD4{
#include "Capture.h" S.{
#include "CaptureDlg.h" yh/JHo;
#include <windowsx.h> UM`{V5NG#
#pragma comment(lib,"hook.lib") *$5p,m6G
#ifdef _DEBUG x]@z.Yj
#define new DEBUG_NEW Qea"49R
#undef THIS_FILE F2\&rC4v
static char THIS_FILE[] = __FILE__; 9|3sNFGX
#endif W/3sJc9
#define IDM_SHELL WM_USER+1 )dFPfu&HL
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *VmX.
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +hKs
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; MsBm0r`a
class CAboutDlg : public CDialog IMncl=1
{ r{B28'f[
public:
2;j<{'
CAboutDlg(); V= -
// Dialog Data )&O6d .
//{{AFX_DATA(CAboutDlg) Mna
yiJl
enum { IDD = IDD_ABOUTBOX }; c%WO#}r|
//}}AFX_DATA BY&{fWUo
// ClassWizard generated virtual function overrides cly}[<w!
//{{AFX_VIRTUAL(CAboutDlg) 7#W]Qj
protected: ZyDNtX%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }n
"5r(*^@
//}}AFX_VIRTUAL )t@9!V
// Implementation alB'l
protected: 4U_+NC>b
//{{AFX_MSG(CAboutDlg) 73]8NVm
//}}AFX_MSG F,A+O+
DECLARE_MESSAGE_MAP() g$jTP#%b
}; (w{T[~6
j!y9E~Zz
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :p,|6~b$
{ ya{`gjIlW
//{{AFX_DATA_INIT(CAboutDlg) ]jY^*o[
//}}AFX_DATA_INIT fm@Pa} ,
} _5H~1G%q
(~%NRH<\
void CAboutDlg::DoDataExchange(CDataExchange* pDX) M^Y[Y@U=p
{ jf-XVk5q
CDialog::DoDataExchange(pDX); "\O7_od-
//{{AFX_DATA_MAP(CAboutDlg) 2Wu`Dp;&l
//}}AFX_DATA_MAP [\#ANA"
} G0|}s&$yL
$,J0) ~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4H(8BNgzV
//{{AFX_MSG_MAP(CAboutDlg) N$=9R
// No message handlers 39hep8+
//}}AFX_MSG_MAP ^N[ Cip}8
END_MESSAGE_MAP() LT
Pr8^
hRRxOr#*$
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m[^)Q9o}
: CDialog(CCaptureDlg::IDD, pParent) .d}yQ#5z
{ 4sntSlz)~k
//{{AFX_DATA_INIT(CCaptureDlg) 2$kB^g!:o
m_bControl = FALSE; bhGRD{=
m_bAlt = FALSE; U65l o[
m_bShift = FALSE; tW4X+d"
m_Path = _T("c:\\"); ju'aUzn
m_Number = _T("0 picture captured."); j6EF0/_|e
nCount=0; 4r`I)
bRegistered=FALSE; <8;~4"'a
bTray=FALSE; 38T]qz[Sn
//}}AFX_DATA_INIT Y.) QNTh
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d,N6~?B
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -(F}=o'
} B1J,4
yf0v,]v[
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pi~5}bF!a
{ wn?oHz*
CDialog::DoDataExchange(pDX); }nX0h6+1
//{{AFX_DATA_MAP(CCaptureDlg) dQ7iieT
DDX_Control(pDX, IDC_KEY, m_Key); wM4{\ f\
DDX_Check(pDX, IDC_CONTROL, m_bControl); M9A1
8d|
DDX_Check(pDX, IDC_ALT, m_bAlt); zn 0y`9!n?
DDX_Check(pDX, IDC_SHIFT, m_bShift); <Vk}U
DDX_Text(pDX, IDC_PATH, m_Path); @IsUY(Gu
DDX_Text(pDX, IDC_NUMBER, m_Number); Y,v9o
//}}AFX_DATA_MAP B)[RIs
} T0")Ryu
@wa"pWx8
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x'|9A?ez@Z
//{{AFX_MSG_MAP(CCaptureDlg) Jk-WD"J6
ON_WM_SYSCOMMAND() 0RtZTCGO
ON_WM_PAINT() qbsod
ON_WM_QUERYDRAGICON() K<:%ofB"S
ON_BN_CLICKED(ID_ABOUT, OnAbout) c5$DHT@N"
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >n3GvZ5%
ON_BN_CLICKED(ID_CHANGE, OnChange) &gruYZGK
//}}AFX_MSG_MAP p\6}<b"p
END_MESSAGE_MAP() b9vudr
u-|%K.A
BOOL CCaptureDlg::OnInitDialog() s`H|o'0
{ __xmn{{L6P
CDialog::OnInitDialog(); & ;.rPU
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lY"l6.c
ASSERT(IDM_ABOUTBOX < 0xF000); p@%Pdx
CMenu* pSysMenu = GetSystemMenu(FALSE); $3l#eKZA
if (pSysMenu != NULL) @,eo*
{ "Ot%{&:2
CString strAboutMenu; VD7-;
strAboutMenu.LoadString(IDS_ABOUTBOX); esA^-$
if (!strAboutMenu.IsEmpty()) S$hxR
{ M j[+h|e
pSysMenu->AppendMenu(MF_SEPARATOR); ;Us6:}s
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?i0+h7=6
} DJgM>&Y6,
} `Wjq$*
SetIcon(m_hIcon, TRUE); // Set big icon C(v'7H{4cW
SetIcon(m_hIcon, FALSE); // Set small icon ?OF$J|h
m_Key.SetCurSel(0); QxLrpM"O
RegisterHotkey(); Yb5@W/'
CMenu* pMenu=GetSystemMenu(FALSE); }wn|2K'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?m2FN<S
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nw--
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4cSs=|m?+
return TRUE; // return TRUE unless you set the focus to a control gizY4~
j
} 1}|y^oB\-
yN{**?b
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jZqa+nG51
{ mfI[9G
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Bf00&PE;
{ 2=;ZJ
CAboutDlg dlgAbout; @H$am
dlgAbout.DoModal(); GY-4w@Wl
} 8aVQW_m}
else iUh7eR9
{ N?{Zrff2"O
CDialog::OnSysCommand(nID, lParam); 9NVtvBA
} [_xOz4`%
} <:/aiX8
v"(6rZsa
void CCaptureDlg::OnPaint() #S/~1{
{ hlV(jz
if (IsIconic()) p+b9D
{ ~I>|f
CPaintDC dc(this); // device context for painting EJC}"%h
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); um]*nXIr
// Center icon in client rectangle 1_LKqBgo
int cxIcon = GetSystemMetrics(SM_CXICON); lY`WEu
int cyIcon = GetSystemMetrics(SM_CYICON); "~=}&
CRect rect; @(a~p
GetClientRect(&rect); M<Z#4Gg#4
int x = (rect.Width() - cxIcon + 1) / 2; mD +9/O!
int y = (rect.Height() - cyIcon + 1) / 2; $<Gt^3e
// Draw the icon EB+4]MsD
dc.DrawIcon(x, y, m_hIcon); i=b'_SZ'
} @]X!#&2>
else wjX0r7^@
{ h6LjReNo
CDialog::OnPaint(); t"%~r3{
} AM!P?${a
} av(qV$2
7eM6 B#rI
HCURSOR CCaptureDlg::OnQueryDragIcon() LL3| U
{ fy>3#`T-
return (HCURSOR) m_hIcon; !$iwU3~<
} Z%.Ld2Q{
kp[&SKU
c
void CCaptureDlg::OnCancel() 7]L}~
{ NPBOG1q%
if(bTray) +gndW
DeleteIcon(); C|FI4/-e
CDialog::OnCancel(); ]OKKR/:
} J^` pE^S
)06. dZq\
void CCaptureDlg::OnAbout() C;ha2UV0H
{ O>rz+8T
CAboutDlg dlg; &JLKHwi/
dlg.DoModal(); PB8U+
} uh)f/)6
96F+I!qC
void CCaptureDlg::OnBrowse() cru&nH*O^
{ GF<SQHL,
CString str; w"Zws[pm]
BROWSEINFO bi; = "Lb5!
char name[MAX_PATH]; Jn?ZJZ
ZeroMemory(&bi,sizeof(BROWSEINFO)); P6^\*xkMr
bi.hwndOwner=GetSafeHwnd(); ='eQh\T)
bi.pszDisplayName=name; pDr/8HEh
bi.lpszTitle="Select folder"; kbz+6LcV
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2U+wiE|
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,5*<C'9
if(idl==NULL) xWQQX
return; M _Lj5`
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :oZ~&H5Q
str.ReleaseBuffer(); 0#ePg6n
m_Path=str;
3=L5Y/
if(str.GetAt(str.GetLength()-1)!='\\') fk5pPm|MiL
m_Path+="\\"; 0[Zs8oRiI
UpdateData(FALSE); "\afIYS I
} J(,gLl
:NwFJc
void CCaptureDlg::SaveBmp() P]4u`&
{ 14-uy.0[
CDC dc; BXl
Y V"
dc.CreateDC("DISPLAY",NULL,NULL,NULL); zq^eL=%:
CBitmap bm; OOus*ooo2
int Width=GetSystemMetrics(SM_CXSCREEN); !Cm9DzG
int Height=GetSystemMetrics(SM_CYSCREEN); +{e2TY
bm.CreateCompatibleBitmap(&dc,Width,Height); F JxH{N6a
CDC tdc; .ddf'$6h
tdc.CreateCompatibleDC(&dc); z{>
)'A/
CBitmap*pOld=tdc.SelectObject(&bm); <e8Ux#x/
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);
3AuLRI
tdc.SelectObject(pOld); L{6Vi&I84[
BITMAP btm; R/c-sV
bm.GetBitmap(&btm); Wzh#dO?7
DWORD size=btm.bmWidthBytes*btm.bmHeight; QbAEWm
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UD]RWN
BITMAPINFOHEADER bih; c30kb
bih.biBitCount=btm.bmBitsPixel; *zPz)3;
bih.biClrImportant=0; 7tT L,Nxe
bih.biClrUsed=0; wAF#N1-k
bih.biCompression=0; r$d'[ZcX
bih.biHeight=btm.bmHeight; 6CWm;%B#G
bih.biPlanes=1; {1wjIo"ptg
bih.biSize=sizeof(BITMAPINFOHEADER); g>f_'7F&
bih.biSizeImage=size; :?gk=JH:
bih.biWidth=btm.bmWidth; Q;p%
VQ
bih.biXPelsPerMeter=0; CM%;r5
bih.biYPelsPerMeter=0; +u7nx
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K&vqk/JW1
static int filecount=0; %LdFS~
CString name; yD&UH_ 1g
name.Format("pict%04d.bmp",filecount++); AUkePp78
name=m_Path+name; ,?!4P+ob
BITMAPFILEHEADER bfh; G-T2b,J
[
bfh.bfReserved1=bfh.bfReserved2=0; uchz<z1
bfh.bfType=((WORD)('M'<< 8)|'B'); 3)py|W%X$
bfh.bfSize=54+size; qc^qCGy!z
bfh.bfOffBits=54; ATU]KL!{
CFile bf; !RdubM
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %?:eURQ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =g^JJpS
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {B6tGLt#bf
bf.WriteHuge(lpData,size); `OyYo^+D|.
bf.Close(); o>4GtvA*
nCount++; ?pF uV`Zm
} }W R?n
GlobalFreePtr(lpData); ;=ERm=
if(nCount==1) 3H/4$XJB
m_Number.Format("%d picture captured.",nCount); <Okl.Iz>
else PEAo'63$
m_Number.Format("%d pictures captured.",nCount); T
.L>PL?=
UpdateData(FALSE); #v4q:&yKf
} lWYgIpw
-jsk-,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m3K .\3
{ j%s:d(H`
if(pMsg -> message == WM_KEYDOWN) Kkds^v6
{ rv97Wm+
if(pMsg -> wParam == VK_ESCAPE) {5gh.
return TRUE; -r"h[UV)
if(pMsg -> wParam == VK_RETURN) W[tX%B
return TRUE; ::rKW*?
} -}*YfwK
return CDialog::PreTranslateMessage(pMsg); MXU8QVSY"
} zz+[]G+"2m
q--;5"=S
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >NN&j#;x~
{ r$Ck:Q}
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <ekLL{/O'
SaveBmp(); |;_uN q9
return FALSE; okZDxg`6
} 6o/!H
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dg]: JU
CMenu pop; rYMHc@a9(
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +gOv5Eno-
CMenu*pMenu=pop.GetSubMenu(0); :CAbGs:56
pMenu->SetDefaultItem(ID_EXITICON); [6Gb@jG
CPoint pt; 7$* O+bkn:
GetCursorPos(&pt); <jvSV5%
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P 6|\
^
if(id==ID_EXITICON) m2"~.iM8
DeleteIcon(); nXOJ
else if(id==ID_EXIT) Z6`[dAo
OnCancel(); 2oFHP_HVfu
return FALSE; As7Y4w*+
} mN:p=.&
<
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (AnM_s
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xm2p<Xu8h
AddIcon(); UjU*`}k3
return res; 5b2_{6t
} tk
<R|i
eO:wx.PW
void CCaptureDlg::AddIcon() IZkQmA=
{ ^/kn#1H7&
NOTIFYICONDATA data; qj5V<c;h%W
data.cbSize=sizeof(NOTIFYICONDATA); +MfdZD
CString tip; Sc zYL?w^
tip.LoadString(IDS_ICONTIP); GwoN=
data.hIcon=GetIcon(0); le-Q&*
data.hWnd=GetSafeHwnd(); 24
i00s|#
strcpy(data.szTip,tip); A<VNttgG
data.uCallbackMessage=IDM_SHELL; ,1+)qv#|i
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f6h!wx
data.uID=98; [nam H a
Shell_NotifyIcon(NIM_ADD,&data);
5 5_#?vw
ShowWindow(SW_HIDE); ^sp+ sr :
bTray=TRUE; Z'vGX,:
} ?x(]U+
,NQucp
void CCaptureDlg::DeleteIcon() lklMdsIdj
{ jCMr[ G=
NOTIFYICONDATA data; CN$wlhs
data.cbSize=sizeof(NOTIFYICONDATA); ni@N/Z?!pA
data.hWnd=GetSafeHwnd(); U]Vu8$W
data.uID=98; *c+Kqz-
Shell_NotifyIcon(NIM_DELETE,&data); !Rzw[~
ShowWindow(SW_SHOW); 8)D5loS
SetForegroundWindow(); Xk_xTzJ
ShowWindow(SW_SHOWNORMAL); %!G]H
bTray=FALSE; XJ|CC.]1u
} jQp7TdvLE$
=~i~SG/f
void CCaptureDlg::OnChange() _^<HlfOK
{ pk*cch#
RegisterHotkey(); R)3P"sGuN
} rVx%"_'*-
#mNM5(o
BOOL CCaptureDlg::RegisterHotkey() i%8I (F
{ w>:~Ev]
UpdateData(); ]e'Ol$3U9=
UCHAR mask=0; "?Eh_Dw
UCHAR key=0; n\#RI9#\
if(m_bControl) \/J7U|@Lt
mask|=4; yE(>R(^
if(m_bAlt) a+TlZE>8
mask|=2; pFLR!/J
if(m_bShift) 9~^%v zM
mask|=1; n y7G
key=Key_Table[m_Key.GetCurSel()]; $W46!U3
if(bRegistered){ J2BW>T!tuw
DeleteHotkey(GetSafeHwnd(),cKey,cMask); }2^_Gaj
bRegistered=FALSE; OA\2ja~+
} $DmWK_A
cMask=mask; <Q06<{]R8
cKey=key; (=d%Bn$6b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <m"yPi3TY
return bRegistered; MZGN,[~)6
} {CM%QMM
I@l'Fx
四、小结 $q]:m+Fm
V=pg9KR!T
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。