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:
vkJ)FEar
y<TOqn 一、实现方法
N1%p"( .Y;b)]@f 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:
1Q]Rd m#JI!_~! #pragma data_seg("shareddata")
4CLsY n? HHOOK hHook =NULL; //钩子句柄
<$%ql'= UINT nHookCount =0; //挂接的程序数目
te i`/ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
WJfES2N static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
wzd`l?o, static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Y,C=@t@_ static int KeyCount =0;
-;$nb~y static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
>-M ]:=L #pragma data_seg()
WSRy%# (?vK_{ 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。
BWh}^3?l joqWh!kv7U 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:
)>\4ULR83 P^pFqUL7# BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
/prYSRn8 cKey,UCHAR cMask)
C ZJV_0 {
F?9SiX[\ BOOL bAdded=FALSE;
tmO`|tn& for(int index=0;index<MAX_KEY;index++){
}k7_'p&yk if(hCallWnd[index]==0){
;$7v%Ls= hCallWnd[index]=hWnd;
}x:0os HotKey[index]=cKey;
~M5:=zKQ HotKeyMask[index]=cMask;
|f\D>Y%) bAdded=TRUE;
4 /'N|c. KeyCount++;
9#qeFBI break;
EiWd+v,QJQ }
$e
}n }
l'6d4
DZ return bAdded;
UX2lPgKdLz }
io.]'"> //删除热键
.IgRY\?Q BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
K*Ks"Vx {
'H|~u&? BOOL bRemoved=FALSE;
NLyXBV[hV for(int index=0;index<MAX_KEY;index++){
e\F}q)_ if(hCallWnd[index]==hWnd){
G>w+#{( if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"$| Zr hCallWnd[index]=NULL;
BtsdeLj| HotKey[index]=0;
hi|! HotKeyMask[index]=0;
c7K!cfO:{N bRemoved=TRUE;
E"qFXA> KeyCount--;
;JT(3yK4>p break;
7&U&E| }
D//=m= }
!:3.D, }
+&5'uAe return bRemoved;
}Cj8 }
d(;4`kd*N gmP9j)V6 19t{|w< DLL中的钩子函数如下:
z)-c#F@% W2]TRO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@0NJ{ {
|yKud BOOL bProcessed=FALSE;
oehaQ#e if(HC_ACTION==nCode)
1/;o {
vWjnI*6T# if((lParam&0xc0000000)==0xc0000000){// 有键松开
fThgK;Qy'U switch(wParam)
w5,Mb {
_mJG5(| case VK_MENU:
o6a0'vU>< MaskBits&=~ALTBIT;
W\cjdd break;
QJGKQ2^ n case VK_CONTROL:
QkQ!Ep( MaskBits&=~CTRLBIT;
Q@S-f:! break;
h4)Bs\==mT case VK_SHIFT:
n V&cC MaskBits&=~SHIFTBIT;
;11x"S break;
O.QK"pKD\ default: //judge the key and send message
d`y!cu2} break;
-_N)E ))G }
~h$wH{-U# for(int index=0;index<MAX_KEY;index++){
vXE0%QE'Q if(hCallWnd[index]==NULL)
*ZrSiIPP continue;
"i^
GmVn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bHE2,;o {
|nUl\WRd\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qv*7K@ bProcessed=TRUE;
L2UsqVU }
i^msjA }
fmX!6Kv }
Lgk else if((lParam&0xc000ffff)==1){ //有键按下
~f\G68c switch(wParam)
^teq[l$; {
\M<3}t case VK_MENU:
p'_%aVm7 MaskBits|=ALTBIT;
+Vb8f["+- break;
sgUud_r)4 case VK_CONTROL:
)!:sFa
1 MaskBits|=CTRLBIT;
w >; L{ break;
]}|byo case VK_SHIFT:
Yr.sm!xA MaskBits|=SHIFTBIT;
q;g>t5]a break;
]V l]XT$Um default: //judge the key and send message
vX0f,y break;
xw^R@H }
zi R5:d3 for(int index=0;index<MAX_KEY;index++){
#6Fez`A if(hCallWnd[index]==NULL)
RqEH|EUZ continue;
B~]5$- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
R'EUV0KX>Y {
7w,FX.=;cv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
DI+]D~N bProcessed=TRUE;
d@`M
CchCB }
JWvjWY2+P }
x3jb%`o#! }
%VYAd)gC if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
x-OA([;/ for(int index=0;index<MAX_KEY;index++){
poGc a1 if(hCallWnd[index]==NULL)
eAv4FA4g continue;
wO ?+Nh if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
U*Ge<(v$ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kpL@P oQ/r //lParam的意义可看MSDN中WM_KEYDOWN部分
];'v8)Y }
\%PaceH }
1XM^8 .; }
ku$$ 1xq return CallNextHookEx( hHook, nCode, wParam, lParam );
Ya>oCr}K }
Gj"7s8(/K| 2
rw%H 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:
1)
ta BdlVabQyKW BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
7K)6^r^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
mxb(<9O g?-lk5 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:
W;bu2ym&Q 3)-/`iy# LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
j83p)ido {
I}Nd$P)> if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
_ZY)M {
hX`}Q4(k //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
C<KrMRWh^ SaveBmp();
(Yp+bS(PU* return FALSE;
%K(<$! }
pw7[y^[Qg …… //其它处理及默认处理
TIp:FW[ }
-@T/b$]'n zSo)k~&[3 Q+4Xs.# 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。
T,|
1g6 X[f=h=| 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。
\j&^aAp r !r#?C9Sq 二、编程步骤
-S3MH1TZ $O9^SB 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";
Neg,qOt !9Aaj<yxm 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
T&Lb<'f ^i:`ZfA# 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;
u_ABt?' rn<PR* 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;
#1>X58I^ @)Ofi j 5、 添加代码,编译运行程序。
jBegh9KHq fk_o@
G!0 三、程序代码
5nsq[Q` ]Dw]p!@ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
X7s
`U5'l #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
zbq@pj)Qu #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
NH+(?TN #if _MSC_VER > 1000
27;ci:5 #pragma once
J~#;<e{\" #endif // _MSC_VER > 1000
OE}*2P/M> #ifndef __AFXWIN_H__
N^3N[lD{ #error include 'stdafx.h' before including this file for PCH
Fd0%lnui #endif
!?|Th5e #include "resource.h" // main symbols
CiB%B`,N class CHookApp : public CWinApp
,?L2wl[ {
lbpq_= public:
V0)fZS@tf CHookApp();
$m42:a mM // Overrides
s8}@=]aA // ClassWizard generated virtual function overrides
#5V9oKM //{{AFX_VIRTUAL(CHookApp)
I'|$}/\` public:
hZ.Z3`v70 virtual BOOL InitInstance();
L:FoSCN Y( virtual int ExitInstance();
mauI42 //}}AFX_VIRTUAL
k+ze74_" //{{AFX_MSG(CHookApp)
T<XA8h* // NOTE - the ClassWizard will add and remove member functions here.
R~Ne|V2 // DO NOT EDIT what you see in these blocks of generated code !
fl\ly`_ //}}AFX_MSG
#-bA[eQV DECLARE_MESSAGE_MAP()
`QXErw };
:s4p/*f LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
b,CaWg BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
WL'P)lI5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
o
LvZ BOOL InitHotkey();
I
:vs;- BOOL UnInit();
ub|V\M{ #endif
Yl3n2R /U 5-M&5f. //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
ELj\[&U #include "stdafx.h"
z_|/5$T>U #include "hook.h"
hNzB4p #include <windowsx.h>
|o\8 #ifdef _DEBUG
y~FV2$ #define new DEBUG_NEW
&}A[x1x06) #undef THIS_FILE
VY3& static char THIS_FILE[] = __FILE__;
wu)w #endif
1;{Rhu7*
k #define MAX_KEY 100
2RX!V@z.G #define CTRLBIT 0x04
sQ
fFu #define ALTBIT 0x02
;72T|e #define SHIFTBIT 0x01
gXjV?"^kUl #pragma data_seg("shareddata")
ll C#1 HHOOK hHook =NULL;
:53)Nv UINT nHookCount =0;
_]Zs,Hy static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
q#s,-u u static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
!TUrQ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
R=|{n'n$0| static int KeyCount =0;
;1a~pF S static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
l?Ya"C`FL #pragma data_seg()
BW"5Aj HINSTANCE hins;
C_7+a@?B void VerifyWindow();
6b:tyQ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:3I@(k\PY //{{AFX_MSG_MAP(CHookApp)
#Y4=J
6 // NOTE - the ClassWizard will add and remove mapping macros here.
1~PV[2a // DO NOT EDIT what you see in these blocks of generated code!
:$n=$C-wp //}}AFX_MSG_MAP
#E&80#Z5 END_MESSAGE_MAP()
{j7uv"|X7 A -b
[>}_ CHookApp::CHookApp()
*m#Za<_Gv {
JhLgCnm // TODO: add construction code here,
AT%u%cE- // Place all significant initialization in InitInstance
' hs2RSq }
o}$EG 2* 2wY = CHookApp theApp;
Ba!J"b] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
*3?'4"B{8 {
Dp':oJC BOOL bProcessed=FALSE;
iB498t if(HC_ACTION==nCode)
3J5!oF{H {
^3UGV*Ypk if((lParam&0xc0000000)==0xc0000000){// Key up
2'W<h)m)z switch(wParam)
wbst8*$ {
k<"oiCE case VK_MENU:
[DF,^4g MaskBits&=~ALTBIT;
7D;cw\ | break;
hUF5fZqii case VK_CONTROL:
oIduxbAp MaskBits&=~CTRLBIT;
,.7*Hpa break;
OEkN(wF case VK_SHIFT:
;t|Ii8Ne MaskBits&=~SHIFTBIT;
&MCbYph, break;
r_-_a(1R: default: //judge the key and send message
{PVW D7 break;
kYjGj,m" }
/|D*w^> for(int index=0;index<MAX_KEY;index++){
Ym =FgM\ if(hCallWnd[index]==NULL)
, T8>}U( continue;
6e[VgN-s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{\:{[{qF {
6,0_)O}\b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
5Er2}KZJv, bProcessed=TRUE;
L{8xlx` }
!y@6Mm }
CW,Wx: Y }
l\@)y4
+ else if((lParam&0xc000ffff)==1){ //Key down
MpF$xzh switch(wParam)
;JayoJ {
p{j.KI s7 case VK_MENU:
<psZQdH MaskBits|=ALTBIT;
.n~M(59 break;
AD|2qM)) case VK_CONTROL:
~x]jB MaskBits|=CTRLBIT;
Yo|,]X>/ break;
w.\&9]P3~ case VK_SHIFT:
~,i-8jl, MaskBits|=SHIFTBIT;
1q,{0s_kp break;
23DiW#o' default: //judge the key and send message
(aH'h1,G break;
9R7A8 }
"$2y-| for(int index=0;index<MAX_KEY;index++)
j4^9 7 {
!;KCU^9 if(hCallWnd[index]==NULL)
*tK\R&4,4s continue;
,f[>L|?e if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z)SY.iK. {
+Zaj,oEE
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`1bv@yzq bProcessed=TRUE;
rV T{90, }
,uSQNre\j }
-@0GcUE:r }
*U
P@9D if(!bProcessed){
-i%e!DgH for(int index=0;index<MAX_KEY;index++){
_N{RVeO if(hCallWnd[index]==NULL)
:{q<{^c continue;
u[DfzH if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
YJJB.hR+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
QmCe>+ }
Yq%9M=#k }
!& z(:d }
C<m{*C-`a return CallNextHookEx( hHook, nCode, wParam, lParam );
.P7"e5ge }
iqe%=%ZR SAyufLEv, BOOL InitHotkey()
@T'i/}nl {
kNobl if(hHook!=NULL){
(q(~de nHookCount++;
-UOj>{- return TRUE;
"O%gFye }
MP4z-4Y else
!BOY@$Y hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
A m>cd; if(hHook!=NULL)
Fd[zDz nHookCount++;
4}eepJOn return (hHook!=NULL);
z<##g }
mjKS{ BOOL UnInit()
fvdU`*|n) {
^$'z!+QRM if(nHookCount>1){
Jc|6& nHookCount--;
]]oI#*c return TRUE;
VCD:3U 8
}
H?)w!QX BOOL unhooked = UnhookWindowsHookEx(hHook);
UHTvCc if(unhooked==TRUE){
fngOeLVG nHookCount=0;
W8KDX_vGJ hHook=NULL;
d ysC4DS }
&3TEfvz return unhooked;
,I%g|'2 }
+i@y@<l:+ <cqbUL BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A*}.EClH {
X;"Sx#U BOOL bAdded=FALSE;
\ywXi~+kUv for(int index=0;index<MAX_KEY;index++){
iC98_o_9 if(hCallWnd[index]==0){
2-C!jAfd hCallWnd[index]=hWnd;
|~X ;1j! HotKey[index]=cKey;
L;'"A#Pa HotKeyMask[index]=cMask;
]y1OFKYv bAdded=TRUE;
(4dhuT KeyCount++;
TwVlg; break;
cM$P`{QrM }
]Zyur` }
ecCr6) return bAdded;
/7t>TYip! }
eFL=G% oBzfbg8p BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
R}4So1 {
2IKnhBSV3 BOOL bRemoved=FALSE;
A .EbXo/ for(int index=0;index<MAX_KEY;index++){
p%*%n3bw if(hCallWnd[index]==hWnd){
"6us#T if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
FMClSeO7
hCallWnd[index]=NULL;
p4-o/8rO HotKey[index]=0;
]jmL]Ny^ HotKeyMask[index]=0;
EB2!Hp uQ3 bRemoved=TRUE;
-wSg2'b4E KeyCount--;
1>E<8&2[L break;
ZRg;/sX] }
SVB \ }
~,5gUl?Il }
5[YDZ7g"~ return bRemoved;
}5}.lJ: }
^ml'? #7q7PYG4 void VerifyWindow()
lMg+R<$~I {
j+["JXy for(int i=0;i<MAX_KEY;i++){
@++.FEf if(hCallWnd
!=NULL){ }A7j/uy}s
if(!IsWindow(hCallWnd)){ iTAx=SG
hCallWnd=NULL;
sSi6wO$
HotKey=0; 2VE9}%i
HotKeyMask=0; g#t[LI9(F[
KeyCount--; }7
c[Q($K
} \V*xWS
}
.5y+fL
} 1r]IogI
} ;bLEL"x%
WzF !6n!h
BOOL CHookApp::InitInstance() h9Y%{v
{ C@L$~iG
AFX_MANAGE_STATE(AfxGetStaticModuleState()); HLZ;8/|48m
hins=AfxGetInstanceHandle(); U~j
^I^
InitHotkey(); 0QOBL'{7)
return CWinApp::InitInstance(); W^]3XJP
} 'zGo?a
8@2OJ =`[
int CHookApp::ExitInstance() p~,]*y:XT
{ ^k#P5oV
VerifyWindow(); _J?
Dq
UnInit(); T3pmVl
return CWinApp::ExitInstance(); Ou1JIxZ)|
} }0X:F`Y-
"0cID3A$
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ek}a}.3 {
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zOa_X~!@
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V*iH}Y?^p
#if _MSC_VER > 1000 nY`RRC
#pragma once 2VJR$Pao
#endif // _MSC_VER > 1000 Hr]h
Jc
nw<&3k(g}
class CCaptureDlg : public CDialog iCcB@GlA
{ }XSfst5-H
// Construction HAJ 7m!P
public: 8peDI7[|
BOOL bTray; \DD0s8
BOOL bRegistered; V` 1/SQX
BOOL RegisterHotkey(); q11>f
UCHAR cKey; tGl;@V@Qj
UCHAR cMask; 3
"Q=Vl"
void DeleteIcon(); [>1OJY.S}T
void AddIcon(); 2U:H545]]
UINT nCount; p-/|mL
void SaveBmp(); lAJxr8 .
CCaptureDlg(CWnd* pParent = NULL); // standard constructor (3#Cl
1]f
// Dialog Data 4W)B'+ZK8
//{{AFX_DATA(CCaptureDlg) ^n"OL*ipG
enum { IDD = IDD_CAPTURE_DIALOG }; Bxfc}vC.
CComboBox m_Key; %ve:hym*
BOOL m_bControl; :9_L6
BOOL m_bAlt; $[/&74#0HX
BOOL m_bShift; 'Ub
g0"F(
CString m_Path; HsHB!mQV
CString m_Number; j.L-{6_s>~
//}}AFX_DATA Ffv`kn@
// ClassWizard generated virtual function overrides !H irhDN
//{{AFX_VIRTUAL(CCaptureDlg) 0 rXx RQ
public: [5MJwRM^!;
virtual BOOL PreTranslateMessage(MSG* pMsg); Ie`13 L2
protected: <B6&I$Wc+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L.1_(3NG
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )p~BQ~eip;
//}}AFX_VIRTUAL /`6ZAom9
// Implementation "gne_Ye.
protected: g)_e]&
HICON m_hIcon; |*'cF-lp6v
// Generated message map functions MF'$~gxo
//{{AFX_MSG(CCaptureDlg) t$xY #:
virtual BOOL OnInitDialog(); v%s`~~u%^
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); krC{ed
afx_msg void OnPaint(); Y<Xz
wro0
afx_msg HCURSOR OnQueryDragIcon(); r]l!WRn
virtual void OnCancel(); aP8H`^DFX>
afx_msg void OnAbout(); pSr{>;bN
afx_msg void OnBrowse(); l#H#+*F
afx_msg void OnChange(); ])
rrG/3
//}}AFX_MSG l-s!A(l
DECLARE_MESSAGE_MAP() %_{tzXim
}; *IY*yR6
#endif *WIj4G.d
"(3BvMA&!9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file bX*Hi#J~A
#include "stdafx.h" _`_%Y(Xat
#include "Capture.h" w -
Pk7I
#include "CaptureDlg.h" 3&[>u;Bp
#include <windowsx.h> DiEluA&w9
#pragma comment(lib,"hook.lib") M5*{
#ifdef _DEBUG I{lT> go
#define new DEBUG_NEW ,>:;#2+og
#undef THIS_FILE #L{OV)a<
static char THIS_FILE[] = __FILE__; 3'c0#h@VD
#endif N\#MwLm
#define IDM_SHELL WM_USER+1 k7>|q"0C
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *hQTO=WF
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 20iq2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :w<V
class CAboutDlg : public CDialog )YX 'N<[
{ q*7zx_ o
public: yI ld75S`
CAboutDlg(); eXKo.JL
// Dialog Data B|4X}*@SX
//{{AFX_DATA(CAboutDlg) hlJq-*6'
enum { IDD = IDD_ABOUTBOX }; tvu!< dxZ
//}}AFX_DATA E7CH^]x
// ClassWizard generated virtual function overrides Wo7F
//{{AFX_VIRTUAL(CAboutDlg) >OG:vw)E
protected: phn9:{TI
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &s$(g~ 4gC
//}}AFX_VIRTUAL P4F3Dc
// Implementation C!R1})_^
protected: dd\n8f
//{{AFX_MSG(CAboutDlg) EvWzq%z
l
//}}AFX_MSG n< ud> JIb
DECLARE_MESSAGE_MAP() ~<k,#^"}X
}; <%Ostqj
i%g#+Gw
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) L dm?JrU
{ '^Ql]% _
//{{AFX_DATA_INIT(CAboutDlg) ` bdZ/*E
//}}AFX_DATA_INIT .hba*dV
} z%e8K(
X83 w@-$}
void CAboutDlg::DoDataExchange(CDataExchange* pDX) UQ +?\wi*
{ VH(S=G5Yb
CDialog::DoDataExchange(pDX); -Y
H<
//{{AFX_DATA_MAP(CAboutDlg) B7]C]=${m
//}}AFX_DATA_MAP qOUqs'7/]
} aAA9$
3nu^l'WQ
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +=mkCU
//{{AFX_MSG_MAP(CAboutDlg) Y;e,Gq`
// No message handlers sz)oZPu|
//}}AFX_MSG_MAP ']>Mp#j
END_MESSAGE_MAP() _x?uU
ObE,$_ k
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;+tpvnV;]
: CDialog(CCaptureDlg::IDD, pParent) GD:4"$)[o
{ >9f%@uSM$3
//{{AFX_DATA_INIT(CCaptureDlg) 3Ezy %7
m_bControl = FALSE; jWY$5Vq<H
m_bAlt = FALSE; ?APeR,"V
m_bShift = FALSE; {fEwA8Ir
m_Path = _T("c:\\"); lr{?"tl_
m_Number = _T("0 picture captured."); '/$d0`3B>
nCount=0; ,N
e;kI
bRegistered=FALSE; ^RP)>d9Xp{
bTray=FALSE; 7yz4'L
//}}AFX_DATA_INIT Vm df8[5
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "d$m@c
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >^Yq|~[
} sk
2-5S
IhBp%^H0-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N*`b%XGn3
{ +Ag!?T
CDialog::DoDataExchange(pDX); b
L]erYm
//{{AFX_DATA_MAP(CCaptureDlg) MzP7Py
8.
DDX_Control(pDX, IDC_KEY, m_Key); OZIW_'Wm/
DDX_Check(pDX, IDC_CONTROL, m_bControl); 24/XNSE,-
DDX_Check(pDX, IDC_ALT, m_bAlt); Rt{B(L.?<
DDX_Check(pDX, IDC_SHIFT, m_bShift); oh
KCdT~
DDX_Text(pDX, IDC_PATH, m_Path); &E40*
(C
DDX_Text(pDX, IDC_NUMBER, m_Number); 8> .J1C
//}}AFX_DATA_MAP P{5-Mx!{&
} 6}(J6T46M[
p<&Xd}]"^W
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @0eHS+
//{{AFX_MSG_MAP(CCaptureDlg) 4WN3=B
ON_WM_SYSCOMMAND() dTL5-@
ON_WM_PAINT() z OSs[[
ON_WM_QUERYDRAGICON() rC7``#5
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3"kdjOB
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9Li%KOY
ON_BN_CLICKED(ID_CHANGE, OnChange) `iJhG^w9M
//}}AFX_MSG_MAP fsEzpUY:{W
END_MESSAGE_MAP() =;3fq-
HoLv`JA
BOOL CCaptureDlg::OnInitDialog() Sje wuIi1
{ 3 AHY|
CDialog::OnInitDialog(); |hO~X~P
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c(/VYMJZ&
ASSERT(IDM_ABOUTBOX < 0xF000); shH~4<15
CMenu* pSysMenu = GetSystemMenu(FALSE); Khe!g1=&X
if (pSysMenu != NULL) iajX ~kv
{ L3p`
CString strAboutMenu; NziZTU}
strAboutMenu.LoadString(IDS_ABOUTBOX); $Y9jrR'w
if (!strAboutMenu.IsEmpty()) /\w)>0
{ R'dSbn
pSysMenu->AppendMenu(MF_SEPARATOR); o d7]tOK9
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); xESjM1A)
} _6k*'aT~FK
} 2~*Ez!.3
SetIcon(m_hIcon, TRUE); // Set big icon X<MO7I
SetIcon(m_hIcon, FALSE); // Set small icon 7nVRn9Hn
m_Key.SetCurSel(0); WH$e2[+Y
RegisterHotkey(); F*Z=<]<+
CMenu* pMenu=GetSystemMenu(FALSE); x%<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "iM~Hy
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K9kUS
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NB7Y{)
w
return TRUE; // return TRUE unless you set the focus to a control .,i(2^
} *1'`"D~
jV/CQM5a+
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >?]_<:
{ \NGC$p n
if ((nID & 0xFFF0) == IDM_ABOUTBOX) J j=;
{ WA$>pG5s
CAboutDlg dlgAbout; `Rdm-[&
dlgAbout.DoModal(); CAU0)=M
} 0vGyI>
else ;oxAe<VIj
{ ^Q{Bq
CDialog::OnSysCommand(nID, lParam); H3H_u4_?SE
} lg}HGG
} +xXH2b$wWC
e8EfQ1 Ar
void CCaptureDlg::OnPaint() gUAxyV
{ v`c$!L5
if (IsIconic()) v6GsoQmA
{ 3^StIw{X
CPaintDC dc(this); // device context for painting $3d}"D
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PU {uE[
// Center icon in client rectangle 1
Vy,&[c~"
int cxIcon = GetSystemMetrics(SM_CXICON); &5%dhc4&!&
int cyIcon = GetSystemMetrics(SM_CYICON); c DrebU
CRect rect; 2T)sXB u
GetClientRect(&rect); /_\#zC[
int x = (rect.Width() - cxIcon + 1) / 2; #n
int y = (rect.Height() - cyIcon + 1) / 2; L!'k !k
// Draw the icon A;J MV+2N
dc.DrawIcon(x, y, m_hIcon); >m'x8xB=
} 7$k8%lI;>
else Pz_NDI
{ tQ~W EC
CDialog::OnPaint(); 3SBZ>
} m7%C#+67
} #g5^SR|qE
o\`>c:.
HCURSOR CCaptureDlg::OnQueryDragIcon() +zkm(
{ gr-x|wK
return (HCURSOR) m_hIcon; q+a.G2S
} Qpt&3_
zTD@
void CCaptureDlg::OnCancel() <8#ObdY!
{ r,N[ )@
if(bTray) [`Cq\mI-W
DeleteIcon(); up%Z$"Y
CDialog::OnCancel(); l+y}4k=/
} }E}8_8T6
Y& ] 8 {
void CCaptureDlg::OnAbout() ?G08[aNR
{ 7@PIM5h
CAboutDlg dlg; [<wbbvXR
dlg.DoModal(); R[1BfZ 6s
} O {k:yVb
"%@uO)A /
void CCaptureDlg::OnBrowse() pl V7+?G
{ \;]kYO}
CString str; 15zrrU~D
BROWSEINFO bi; y_}SK6{
char name[MAX_PATH]; o0pT6N)
ZeroMemory(&bi,sizeof(BROWSEINFO)); *o' 4,+=am
bi.hwndOwner=GetSafeHwnd(); ecX/K.8l
bi.pszDisplayName=name; !]S=z^"<
bi.lpszTitle="Select folder"; -qe bQv
bi.ulFlags=BIF_RETURNONLYFSDIRS; l
SkEuN
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3^.8.q(6
if(idl==NULL) \NX Q
return; M0-,M/]l
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); QMk+RM8U
str.ReleaseBuffer(); yu
,h\
m_Path=str; &!y]:CC{
if(str.GetAt(str.GetLength()-1)!='\\') mEQ!-p
m_Path+="\\"; {$^SP7qV#>
UpdateData(FALSE); !Zbesp KZ
} >sj
bK%
U&y`-@A4
void CCaptureDlg::SaveBmp() "L3Xd][
{ :+,st&(E
CDC dc; d<@Mdo<;?g
dc.CreateDC("DISPLAY",NULL,NULL,NULL); T+RZ
CBitmap bm; 3SARr>HRyI
int Width=GetSystemMetrics(SM_CXSCREEN); T 4|jz<iK]
int Height=GetSystemMetrics(SM_CYSCREEN); agd)ag4"[u
bm.CreateCompatibleBitmap(&dc,Width,Height); F*
#h9
Y
CDC tdc; PM4>ThQ
tdc.CreateCompatibleDC(&dc); ^p_u.P
CBitmap*pOld=tdc.SelectObject(&bm); 135vZ:S
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zH'2s-.bi
tdc.SelectObject(pOld); jxy1
BITMAP btm; 3ViM ?p
bm.GetBitmap(&btm); 5#_tE<uM
DWORD size=btm.bmWidthBytes*btm.bmHeight; k|O,1
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); H2Eb\v`#
BITMAPINFOHEADER bih; G^Xd- 7 GQ
bih.biBitCount=btm.bmBitsPixel; P Tnac
bih.biClrImportant=0; +zRh
fIJHH
bih.biClrUsed=0; %{STz
bih.biCompression=0; C=VIT*=
bih.biHeight=btm.bmHeight; 00M`%c/
bih.biPlanes=1; p\U*;'hv
bih.biSize=sizeof(BITMAPINFOHEADER); Sue
6+p
bih.biSizeImage=size; {TL +7kiX/
bih.biWidth=btm.bmWidth; Z~3u:[x";
bih.biXPelsPerMeter=0; (L|}`
bih.biYPelsPerMeter=0; B4O6>'
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
C(]'&~}(
static int filecount=0; ):bu;3E
CString name; , deUsc
name.Format("pict%04d.bmp",filecount++); 3#Y3Dz`
name=m_Path+name; Q-R}qy5y
BITMAPFILEHEADER bfh; lIuXo3
bfh.bfReserved1=bfh.bfReserved2=0; %yaG,;>U
bfh.bfType=((WORD)('M'<< 8)|'B'); DuF7HTN[K
bfh.bfSize=54+size; M^ 5e~y
bfh.bfOffBits=54; w3#`1T`N
CFile bf; V:\]cGA{
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U1Yo7nVf
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0yHjrxc$
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5
R*lVUix
bf.WriteHuge(lpData,size); h#{T}[
bf.Close(); 93I'cWN
nCount++; 55hyV{L%
} GOW"o"S
GlobalFreePtr(lpData); +{6`F1MO
if(nCount==1) /Dw@d,&[
m_Number.Format("%d picture captured.",nCount); 9bEM#Hj
else VD#!ztcY'
m_Number.Format("%d pictures captured.",nCount); +t>XxYScx
UpdateData(FALSE); T_~KxQ
} M5Wl3tZL
5T/J%
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y[:q"BB3
{ ny`(f,)u*
if(pMsg -> message == WM_KEYDOWN) &r:m&?!|VQ
{ /p$=Cg[K
if(pMsg -> wParam == VK_ESCAPE) l<2oklo5
return TRUE; aFG3tuaKrQ
if(pMsg -> wParam == VK_RETURN) $WNG07]tU
return TRUE; m;h<"]<
} 6{7 3p@
return CDialog::PreTranslateMessage(pMsg); ycjJbL(.
} B+Q+0tw*i
XTj73 MWY
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !~d'{sy6
{ Yzd2G,kZ=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Y*\6o7
SaveBmp(); =yh3Nd:u
return FALSE; ( 2zeG`
} &A"e,h(^
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p1
4d,}4W
CMenu pop; b8HE."*t
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); tzNaw %\
CMenu*pMenu=pop.GetSubMenu(0); t {=i=K3
pMenu->SetDefaultItem(ID_EXITICON); M@~o6 ^
CPoint pt; V5Xi '=
GetCursorPos(&pt); =z-5
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);
0dh#/
if(id==ID_EXITICON) A|C_np^z2
DeleteIcon(); M*H<
n*
else if(id==ID_EXIT) E&9!1!B
OnCancel(); /=trj5h
return FALSE; 1uC;$Aj6:
} ^5>du~d
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "<*nZ~nE)
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8;8YA1@w
AddIcon(); K>LpN')d
return res; gr\@sx?b
} <p)Z/
:;_#5
void CCaptureDlg::AddIcon() u0'i!@795
{ /4H[4m]I
NOTIFYICONDATA data; 6s5b$x
data.cbSize=sizeof(NOTIFYICONDATA); Q!x`M4
CString tip; tO4):i1
tip.LoadString(IDS_ICONTIP); T\cR2ZT~
data.hIcon=GetIcon(0); j Ii[
data.hWnd=GetSafeHwnd(); vu ?3$
strcpy(data.szTip,tip); QxA0I+i
data.uCallbackMessage=IDM_SHELL; S" {GlRpd
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \2Xx%SX
data.uID=98; vQy$[D*
Shell_NotifyIcon(NIM_ADD,&data); !Z-9tYO
ShowWindow(SW_HIDE); u/#&0_
P
bTray=TRUE; Uf^RLdoDn
} 7 7^
"xsa
jjX%$Hr
void CCaptureDlg::DeleteIcon() ,{pGP#
{ "SLvUzO>q
NOTIFYICONDATA data; `1$y( w]
data.cbSize=sizeof(NOTIFYICONDATA); k%^<}s@
data.hWnd=GetSafeHwnd(); ~z>BfL
data.uID=98; k}-]W@UCa?
Shell_NotifyIcon(NIM_DELETE,&data); ]xI?,('_m
ShowWindow(SW_SHOW); PC[cHgSYU
SetForegroundWindow(); gjQ=8&i
ShowWindow(SW_SHOWNORMAL); @?Fx
bTray=FALSE; ^ePsIl1E
} Fj,(_^
/_HwifRQ
void CCaptureDlg::OnChange() y]J3hKs
{ hMz&JJ&B
RegisterHotkey(); ) (+)Q'*
} }R`Irxv4
=Iy/cHK
BOOL CCaptureDlg::RegisterHotkey() Dw*Arc+3V
{ -}< d(c
UpdateData(); :;q>31:h
UCHAR mask=0;
A<2I!
UCHAR key=0; R|$[U
if(m_bControl) xHm/^C&px
mask|=4; 0FTRm2(
if(m_bAlt) 2q/nAQ+
mask|=2; XN4oL[pO
if(m_bShift) Et)920
mask|=1; .B6`OX&k
key=Key_Table[m_Key.GetCurSel()]; 8i[".9}G\
if(bRegistered){ 6GY32\Ac
DeleteHotkey(GetSafeHwnd(),cKey,cMask); z;ULQ
bRegistered=FALSE; kAY@^vi
} b#Jo Xa9
cMask=mask; Ew>~a8!Fq
cKey=key; Oq[i &
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \Oz,Qzr|
return bRegistered; m';#R9\Fz
}
!8we8)7
L#`7 FaM?
四、小结 >kt~vJI
{ip=iiW2
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。