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:
$L"h|>b\o
i)th] 1K% 一、实现方法
E_-QGE/1 7r o&Q% 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:
J^y?nE(j Ge1b_?L_ #pragma data_seg("shareddata")
d3"QCl HHOOK hHook =NULL; //钩子句柄
o1Nfn'!3/> UINT nHookCount =0; //挂接的程序数目
&M{;[O{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
L%;[tu(* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
;LqpX!Pi
f static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
mnL+@mm static int KeyCount =0;
nZ %%{#T7 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
5jAS1XG #pragma data_seg()
RmRPR<vGW $0XR<D 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
wDDNB1_E YF)k0bu&; DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
d<Dm( / }Pj^^6A< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
z)Lw\H^/ cKey,UCHAR cMask)
lKG' KR. {
)fQ1U BOOL bAdded=FALSE;
7j8lhrM}^ for(int index=0;index<MAX_KEY;index++){
53WCF[ if(hCallWnd[index]==0){
__Zex5Y#- hCallWnd[index]=hWnd;
mx5#K\ HotKey[index]=cKey;
qPBOt;N HotKeyMask[index]=cMask;
)kD B*(? bAdded=TRUE;
nrg$V>pD KeyCount++;
2p~}<B break;
V{UY_
e8W }
x;{Hd;<YF }
K5!OvqzG return bAdded;
dngG= }
M $f6.j //删除热键
h43py8v BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
L7]o^p{g}Q {
'0w</g BOOL bRemoved=FALSE;
i>O8q%BnJ for(int index=0;index<MAX_KEY;index++){
Xo$SQ0K if(hCallWnd[index]==hWnd){
mDx=n.lIz if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]=ADX} hCallWnd[index]=NULL;
RT|1M"?$ HotKey[index]=0;
{krBAz& HotKeyMask[index]=0;
"
v<O)1QT bRemoved=TRUE;
@FZbp KeyCount--;
^.9DfA0 break;
?j&ZzK'#^ }
2Z>8ROv^X }
Eq|5PE^7 }
}N&?8s= return bRemoved;
lffw
" }
0S96x}]J B }U ' hn~btu9h DLL中的钩子函数如下:
WLA&K] UA|\D]xe LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Z~F*$jn {
H:S<O%f BOOL bProcessed=FALSE;
]
n\]ao if(HC_ACTION==nCode)
3N5@<:2` {
P=PeWX*L<Z if((lParam&0xc0000000)==0xc0000000){// 有键松开
v*OV\h. switch(wParam)
!_FTy^@c2 {
cyo[HI?WM case VK_MENU:
XFYa+]B2q MaskBits&=~ALTBIT;
C^;>HAK|F break;
H+Aidsn case VK_CONTROL:
=X9fn MaskBits&=~CTRLBIT;
m/"([Y_ break;
-y>~ :. case VK_SHIFT:
<<b]v I MaskBits&=~SHIFTBIT;
+#\7
#Y break;
ex
BLj
*] default: //judge the key and send message
?GlXxx=eV break;
Si@6'sw }
N\];{pe> for(int index=0;index<MAX_KEY;index++){
AOJ[/YpM if(hCallWnd[index]==NULL)
!C h1q continue;
{,u})U2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*nYg-) {
"7'P Lo3O SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
xZ6x`BET- bProcessed=TRUE;
uq;yR[w" }
RL$%Vy0 }
&Q#*Nnb3 }
li,rPUCt else if((lParam&0xc000ffff)==1){ //有键按下
$s4.Aj switch(wParam)
@meT8S9t {
2W2T case VK_MENU:
TMo DN%{ MaskBits|=ALTBIT;
T@*'}* break;
y$9! rbL case VK_CONTROL:
3H0B+F2XQ MaskBits|=CTRLBIT;
PfyJJAQ[ break;
`lQ;M?D case VK_SHIFT:
\Z,{De% MaskBits|=SHIFTBIT;
<MX break;
k'k}/Hxub default: //judge the key and send message
C
fM[<w
break;
KyyVO" }
([
-i5 for(int index=0;index<MAX_KEY;index++){
U1HG{u,"y if(hCallWnd[index]==NULL)
D6H?*4f] continue;
$8xb|S[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
p_(En4QSH {
rlGv6)vb SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-7]j[{?w bProcessed=TRUE;
e#,(a }
V[uSo$k+> }
nmts% u }
%<x!mE x if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
%1$#fxR for(int index=0;index<MAX_KEY;index++){
P%H Dz if(hCallWnd[index]==NULL)
Fe4>G8uuwn continue;
ca,W:9#.xn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
IRwtM'%0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.izq}q*P //lParam的意义可看MSDN中WM_KEYDOWN部分
#\`kg#& }
ZX64kk+ }
)UM^#<- }
Mn/@?K?y return CallNextHookEx( hHook, nCode, wParam, lParam );
'A^q)hpax }
[61*/=gWe K,I 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
k@un}}0r w#[cGaIB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3fp&iz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
n=bdV(?4 7KX27.~F 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
,`k&9o7 Dsp$Nr%* LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
fggs
;Le {
D[ #V if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Y)DX {
=u ?aP}zc //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
o.Rv<a5.L SaveBmp();
6[4VbIBSI return FALSE;
4l%1D.3-O }
w3ni@'X8 …… //其它处理及默认处理
?h&?`WO( }
Hcwfe=K&/ J-Tiwl Zi.' V 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。
ON){d!]uJ @qan &?-Y 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。
~^V&n`*7D DrkTM< 二、编程步骤
L"%SU eu9*3'@A 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";
4$[o; t> CDRbYO 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
vM6W64S gWGDm~+ 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;
$q)YC.5$ 4minzrKM\ 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;
5N;'CAk Mh4MaLw
5、 添加代码,编译运行程序。
D,ZLo~ |DJ8
"T]E 三、程序代码
Leb|YX #YYJ4^":k ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
~cCMLK em #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
@)uV Fw"\ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
twq~.:<o #if _MSC_VER > 1000
jh)@3c #pragma once
(+epRC #endif // _MSC_VER > 1000
7!pKlmQ #ifndef __AFXWIN_H__
ZQ_6I}i") #error include 'stdafx.h' before including this file for PCH
~}}<+ JEEO #endif
:86:U 0^ #include "resource.h" // main symbols
nYjrEy)Q class CHookApp : public CWinApp
e))L&s {
3@Mh* \;\b public:
{9U!0h-2" CHookApp();
hj9TiH/+ // Overrides
Td|u@l4B // ClassWizard generated virtual function overrides
GQn:lu3j: //{{AFX_VIRTUAL(CHookApp)
oNyYx6q:Q public:
WC`h+SC`. virtual BOOL InitInstance();
?gl&q+mv virtual int ExitInstance();
G/<zd) //}}AFX_VIRTUAL
#BUq;5 //{{AFX_MSG(CHookApp)
7TMq#Pb // NOTE - the ClassWizard will add and remove member functions here.
gCb+hQq\ // DO NOT EDIT what you see in these blocks of generated code !
2URGd#{VQ //}}AFX_MSG
&Mk!qE<:N DECLARE_MESSAGE_MAP()
]=qauf>3 };
_TOWqV^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
J8alqs7 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
+ U5Q/g BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
wW@e#: BOOL InitHotkey();
)N&SrzqTK BOOL UnInit();
LJGpa )( #endif
9kH~=`: ? u^tQ2&?O!P //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Ig`q[o #include "stdafx.h"
-[L\:'Gp5 #include "hook.h"
tF`L]1r> #include <windowsx.h>
F,wB6Cw #ifdef _DEBUG
'F/oR/4, #define new DEBUG_NEW
h#hr'3bI1 #undef THIS_FILE
_xaum static char THIS_FILE[] = __FILE__;
{r&mNbz #endif
6:#o0OeBP #define MAX_KEY 100
K=[7<b,:3 #define CTRLBIT 0x04
\5r^D|Rp} #define ALTBIT 0x02
9:USxFM #define SHIFTBIT 0x01
't5ufAT #pragma data_seg("shareddata")
#cfiN b}GX HHOOK hHook =NULL;
;\mX=S|a UINT nHookCount =0;
$v;WmYTJ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
#c^]p/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
x|rc[e%k static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
lmzHE8MUNu static int KeyCount =0;
Q"XDxa'7" static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
gu(:'5cX #pragma data_seg()
Sv n7.Ivep HINSTANCE hins;
|q*yuK/ void VerifyWindow();
L1SKOM$ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
.KA-=$~J1 //{{AFX_MSG_MAP(CHookApp)
[`\VgKeu // NOTE - the ClassWizard will add and remove mapping macros here.
AOR?2u // DO NOT EDIT what you see in these blocks of generated code!
i<^X z //}}AFX_MSG_MAP
Y\]ZIvTSb END_MESSAGE_MAP()
)}@D\(/@ ~v;I>ij CHookApp::CHookApp()
nHdQe {
kw#X,hP // TODO: add construction code here,
(u@:PiU/eP // Place all significant initialization in InitInstance
aj&L
Z DD6 }
oRWje#4O fs'SCwx CHookApp theApp;
OX7=g$S 1 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
hu}$ \ {
e"S?qpJK BOOL bProcessed=FALSE;
P51M?3&=l if(HC_ACTION==nCode)
I`V<Sh^Qd {
ccag8LC if((lParam&0xc0000000)==0xc0000000){// Key up
%;'~TtW5 switch(wParam)
j&d5tgLB {
%GhI0F # case VK_MENU:
1Toiqb/ MaskBits&=~ALTBIT;
>3uNh:|>/ break;
,eyh%k*hz case VK_CONTROL:
8_('[89m MaskBits&=~CTRLBIT;
O
k`}\NZL break;
yJ $6vmQ case VK_SHIFT:
_re# b? MaskBits&=~SHIFTBIT;
Jl~ *@0( break;
( eTrqI` default: //judge the key and send message
zC2:c"E
I break;
BPO5=]W 7 }
%F 2h C
x for(int index=0;index<MAX_KEY;index++){
}(nT(9| if(hCallWnd[index]==NULL)
h3?>jE=H continue;
fN&\8SPE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/+Z*)q+SbT {
WO qDW~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
a2Ak?W1 bProcessed=TRUE;
-l= 4{^pK }
Z =+Z96 }
xe!bfzU }
8fXiadP# else if((lParam&0xc000ffff)==1){ //Key down
MGR:IOTa switch(wParam)
Dkz/hg:q {
YRu@;
` case VK_MENU:
yvYMk(LSF MaskBits|=ALTBIT;
f% pT-# break;
*dw.=a9 case VK_CONTROL:
e|]e\Or> MaskBits|=CTRLBIT;
XGl2rX& break;
W+ S~__K case VK_SHIFT:
p) 8S]p] MaskBits|=SHIFTBIT;
s;VW
%e break;
1h$?, default: //judge the key and send message
;'7(gAE break;
<mn[- }
Np" p*O for(int index=0;index<MAX_KEY;index++)
xb;{<~`71 {
YYe G9yR if(hCallWnd[index]==NULL)
P.]h`4 continue;
=^4Z]d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;st0Ekni) {
oYqHl1cs SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
;,f\Wf"BW bProcessed=TRUE;
XY"b 90 }
*ub2dH4/ }
m+(Cl#+ }
y :;.r: if(!bProcessed){
9;@p2t*v for(int index=0;index<MAX_KEY;index++){
~lj[> |\Oj if(hCallWnd[index]==NULL)
Q~,Mzt"}W continue;
P<PZ4hNx if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
sA2-3V<t8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(4YLUN&1O$ }
xp^RAVXq` }
N"70P/ }
F3|^b{'zO return CallNextHookEx( hHook, nCode, wParam, lParam );
42dv3bE" }
_**Nlp*% 8
lggGt BOOL InitHotkey()
}S> 4.8 {
[H h-F#|R if(hHook!=NULL){
b>-DX nHookCount++;
n~^SwOt~;5 return TRUE;
nR_Zrm }
:G _ else
W==~9 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
2R/|/>T v if(hHook!=NULL)
9!( 8o nHookCount++;
T\l`Y-vu return (hHook!=NULL);
*tXyd<_Hd }
d(q1?{zr4 BOOL UnInit()
p@tg pFt {
*[si!e% if(nHookCount>1){
\L Q+
n+ nHookCount--;
2K}49* return TRUE;
5$9$R(KU }
*&_*G~>D BOOL unhooked = UnhookWindowsHookEx(hHook);
0 +=sBk ( if(unhooked==TRUE){
NqD]p{>Y nHookCount=0;
(nqry[g& hHook=NULL;
*ID=X!v }
94tfR$W;- return unhooked;
kdNo<x1o }
9j2t|D4uT @c|=onx5 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2) X#&IE {
.6wPpL G?{ BOOL bAdded=FALSE;
\g}]u(zg% for(int index=0;index<MAX_KEY;index++){
U6.aoqb% if(hCallWnd[index]==0){
&4?&tGi hCallWnd[index]=hWnd;
iWCYK7c@.- HotKey[index]=cKey;
xC)bW,% HotKeyMask[index]=cMask;
6GxLaI bAdded=TRUE;
&S >{9y% KeyCount++;
3TwjC:Yhv2 break;
VF?H0}YSHb }
'/>Mr!H# }
Wiis<^) return bAdded;
+CSpL2@ }
o~LJ+m6-) ]_s3<&R BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
J^7m?mA {
Dz }i-tw+ BOOL bRemoved=FALSE;
[ws
_ g,/ for(int index=0;index<MAX_KEY;index++){
&N}"4 if(hCallWnd[index]==hWnd){
e9LX0= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~`
tuPk~l hCallWnd[index]=NULL;
0Ui.nz j HotKey[index]=0;
Hv;xaT<}V
HotKeyMask[index]=0;
u
BEwYQB bRemoved=TRUE;
qDdO-fPev KeyCount--;
F-,gj{s break;
khy'Y&\F; }
U)(R4Y6 v }
jq~`rE
h9 }
Rta}* return bRemoved;
/v!yI$xc }
*)K
5<}V Sz0PZtJ void VerifyWindow()
_o~ pVBl/ {
ktyplo#F for(int i=0;i<MAX_KEY;i++){
i~u4v3r= if(hCallWnd
!=NULL){ 0%f}Q7*R
if(!IsWindow(hCallWnd)){ u({^8: AYu
hCallWnd=NULL; .<m]j;|6
HotKey=0; Zl>SeTjB-
HotKeyMask=0; Z
'5itN^
KeyCount--; YSnh2 Bq
} J9T2 p\5
} 7@c!4hmrU
} Myc-lCE
} P+CV4;Xz
rNN>tpZ}
BOOL CHookApp::InitInstance() 8Ths"zwn
{ 5:@bNNX'j
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?mH=3
:~
hins=AfxGetInstanceHandle(); :C5w5
Vnj
InitHotkey(); !Rv ;~f/2
return CWinApp::InitInstance(); 5IU!BQU
} =4_}.
R_EU|a
int CHookApp::ExitInstance()
j^jC|
{ S`-I-VS=L
VerifyWindow(); #BRIp(65-6
UnInit(); O=Su
E/q
return CWinApp::ExitInstance(); kQ+y9@=/g
} u&~Xgq5[
J^+w]2`S
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F,_L}
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) f`qy~M&
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -zK>{)Z=q
#if _MSC_VER > 1000 D.Ke
#pragma once ~n
'A1
#endif // _MSC_VER > 1000 I0
t#{i
HI5NWdfRl
class CCaptureDlg : public CDialog t'_EcYNS
{ 2}^=NUM\NX
// Construction _ZRmD\_t
public: J^8j|%h%e
BOOL bTray; Dl>tF?=
BOOL bRegistered; J4qk^1m.
BOOL RegisterHotkey(); 5o6IpF0V
UCHAR cKey; hb3n-
rO
UCHAR cMask; Xqf\}p n
void DeleteIcon(); 2Bt/co-~4
void AddIcon(); yi8vD~aA[
UINT nCount; i#:To
|\u
void SaveBmp(); b!H1|7>
CCaptureDlg(CWnd* pParent = NULL); // standard constructor SQ)BS/8A
// Dialog Data ;lmg0dtJ
//{{AFX_DATA(CCaptureDlg) m=}h7&5 p
enum { IDD = IDD_CAPTURE_DIALOG }; 19fa7E<
CComboBox m_Key; EZ!! V~
BOOL m_bControl; =1[_#Moc6
BOOL m_bAlt; Zfs-M)
BOOL m_bShift; GgxPpS<ne
CString m_Path; Z=%
j|xE_
CString m_Number; ~~yng-3)1
//}}AFX_DATA s9C^Cy^su
// ClassWizard generated virtual function overrides 0H_Ai=G
//{{AFX_VIRTUAL(CCaptureDlg) qT?{}I
public: W* LC3B^
virtual BOOL PreTranslateMessage(MSG* pMsg); JE O$v|X
protected: (aYu[ML
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?e9tnk3
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 89d%P
J0
//}}AFX_VIRTUAL u(zgKoF9A
// Implementation CVO_F=;
protected: xa`xHh{0
HICON m_hIcon; jtoS{B,
// Generated message map functions [P}Bq6;p
//{{AFX_MSG(CCaptureDlg) APl]EV"l
virtual BOOL OnInitDialog(); QN8+Uj/zx
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %Z6Q/+#fn
afx_msg void OnPaint(); 7nPg2K&
afx_msg HCURSOR OnQueryDragIcon(); 59nRk}^$se
virtual void OnCancel(); k _t|)
J
afx_msg void OnAbout(); aQoB1qd8
afx_msg void OnBrowse(); Q7x[08TI
afx_msg void OnChange(); D:k< , {
//}}AFX_MSG K qJE?caw
DECLARE_MESSAGE_MAP() kw59`z Es
}; ,X/j6\VBO
#endif :}_hz )
?q6#M&|j/I
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C-edQWbcP
#include "stdafx.h" ~2*LWH*@
#include "Capture.h" r
(m3"Xu6O
#include "CaptureDlg.h" mX|M]^_,z
#include <windowsx.h> P 0\`4Cr!
#pragma comment(lib,"hook.lib") !$n@:W/
#ifdef _DEBUG bofI0f}5.
#define new DEBUG_NEW TqJ @l
#undef THIS_FILE r QzdHA
static char THIS_FILE[] = __FILE__; !v2/sq$G
#endif `GE8?UO-
#define IDM_SHELL WM_USER+1 [w}- )&c
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sd4eG
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A^}#
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ql9n`?Q
class CAboutDlg : public CDialog ~Jf(M^E
{ /BgXY}JC.
public: 6EC',=)6R
CAboutDlg(); n]6'!Eo
// Dialog Data OK4r)
//{{AFX_DATA(CAboutDlg) ,LZA\XC
enum { IDD = IDD_ABOUTBOX }; 8`S1E0s
//}}AFX_DATA ksq4t
// ClassWizard generated virtual function overrides n\;;T1rM
//{{AFX_VIRTUAL(CAboutDlg) pYcs4f!?p
protected: #j7&2L
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zf>:h
//}}AFX_VIRTUAL ]6(%tU
// Implementation yoGG[l2k>s
protected: & *tL)qKDc
//{{AFX_MSG(CAboutDlg) 8i$|j~M a
//}}AFX_MSG l!gX-U%-
DECLARE_MESSAGE_MAP() (P E.v1T
}; a;5clonB
`BZ|[
q3
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *& w/*h$!
{ pk u\)
//{{AFX_DATA_INIT(CAboutDlg) xjBY6Ylz
//}}AFX_DATA_INIT KsGW@Ho:
} 9'(^Coq
j![1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~5Fx[q
{ wYe;xk`>
CDialog::DoDataExchange(pDX); }alq~jY
//{{AFX_DATA_MAP(CAboutDlg) M2V`|19Q
//}}AFX_DATA_MAP gIO_mJ3 u
} !>'A2V~F
p+Q 9?9
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ##By!FTP
//{{AFX_MSG_MAP(CAboutDlg) Qu#[PDhb
// No message handlers WS6Qp`c)e
//}}AFX_MSG_MAP 0]f/5jvLj
END_MESSAGE_MAP() ,fiV xn Q
&@xm< A\S
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?Xpk"N7
: CDialog(CCaptureDlg::IDD, pParent) j#3IF *"
{ q-^{2.ftcx
//{{AFX_DATA_INIT(CCaptureDlg) !]?kvf-3e
m_bControl = FALSE; !'!\>x$
m_bAlt = FALSE; %>/&&(BE
m_bShift = FALSE; xjD$i'V+
m_Path = _T("c:\\"); K:e[#b8:R
m_Number = _T("0 picture captured."); S*n5d >;
nCount=0; 5(2 C
bRegistered=FALSE; Tcv/EST
bTray=FALSE; x
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//}}AFX_DATA_INIT
n?c[ E+i;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #"oLz"{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); i<$?rB!i<1
} 3w>1R>7
k]AL\)
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Zk~Pq%u
{ 6W:]'L4!
CDialog::DoDataExchange(pDX); Hxy=J
//{{AFX_DATA_MAP(CCaptureDlg) tSni[,4Kq
DDX_Control(pDX, IDC_KEY, m_Key); [c;0eFSi2
DDX_Check(pDX, IDC_CONTROL, m_bControl); 63'%+
DDX_Check(pDX, IDC_ALT, m_bAlt); rR^o
DDX_Check(pDX, IDC_SHIFT, m_bShift); 4lCbUk[l
DDX_Text(pDX, IDC_PATH, m_Path); `
>>]$ZJ
DDX_Text(pDX, IDC_NUMBER, m_Number); PDH|=meXM
//}}AFX_DATA_MAP 4h?@D_{k
} CXGMc)#>f
A|PZ<WAY
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) N`d%4)|{
//{{AFX_MSG_MAP(CCaptureDlg) _s<BXj
ON_WM_SYSCOMMAND() 'A3*[e|OS
ON_WM_PAINT() ]N\D^`iQ
ON_WM_QUERYDRAGICON() pub?%
ON_BN_CLICKED(ID_ABOUT, OnAbout) +BM[@?"hrh
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) b7+(g[O
ON_BN_CLICKED(ID_CHANGE, OnChange) S.>fB7'(?=
//}}AFX_MSG_MAP uMm`j?Y23q
END_MESSAGE_MAP() (I6Q"&h]
%p7onwKq0
BOOL CCaptureDlg::OnInitDialog() Ik,N/[
{ 9W-"mD;
CDialog::OnInitDialog(); yzl}!& E
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )b%zYD9p
ASSERT(IDM_ABOUTBOX < 0xF000); QxbG-B^)=
CMenu* pSysMenu = GetSystemMenu(FALSE); x8c>2w;6x^
if (pSysMenu != NULL) PYNY1|3
{ vo:h"ti
CString strAboutMenu; *6][[)(
strAboutMenu.LoadString(IDS_ABOUTBOX); h'GOO(
if (!strAboutMenu.IsEmpty()) uwi.Sg11
{ 4Q1R:Ra
pSysMenu->AppendMenu(MF_SEPARATOR); ,ExY.'%1
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
0,&] 2YJ
} yW*,Llb5
} vV=rBO0a?
SetIcon(m_hIcon, TRUE); // Set big icon [5!{>L`
SetIcon(m_hIcon, FALSE); // Set small icon pKLNBR|
m_Key.SetCurSel(0); N_FjEZpX
RegisterHotkey(); =b"{*Heuw
CMenu* pMenu=GetSystemMenu(FALSE); J0f!+]~G3
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =eS?`|
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0dsL%G~/N
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Kv:.bHN}
return TRUE; // return TRUE unless you set the focus to a control pI.8Ip_r
} u^i3 @JuX
![4_K':=
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) OaT]2o
{ }fef* >>}
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5zZQt+Ip
{ BhjDyB
CAboutDlg dlgAbout; ttB>PTg#
dlgAbout.DoModal(); *2.h*y'u
} ]R!YRu
else <EE^ KR96
{ Gf+X<a
CDialog::OnSysCommand(nID, lParam); 9GT}_
^fb
} Gr}NgyT<!D
} B+jh|@-
A@Zqh<,Ud
void CCaptureDlg::OnPaint() eHIcfp@&
{ r}(m jC"o
if (IsIconic()) e%)MIAS0
{ 6#qt%t%?D
CPaintDC dc(this); // device context for painting 1A*
"v
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b5.]}>]t
// Center icon in client rectangle UxF9Ko( ]d
int cxIcon = GetSystemMetrics(SM_CXICON); sV0NDM0
int cyIcon = GetSystemMetrics(SM_CYICON); GJU9[
CRect rect; q<^MC/]
GetClientRect(&rect); 7hLh}
int x = (rect.Width() - cxIcon + 1) / 2; >o3R~ [
int y = (rect.Height() - cyIcon + 1) / 2; 4MzPm~Ct
// Draw the icon }}rp/16
dc.DrawIcon(x, y, m_hIcon); j0Cj&x%qF}
} zN)) .a
else Ek_<2!%X
{ 9@mvG^
CDialog::OnPaint(); +!:=Mm
} ^qVBg BPb
} /C<p^#g9.
&U`ug"/k
HCURSOR CCaptureDlg::OnQueryDragIcon() OZz!8-|wE
{ ^B}q@/KV
return (HCURSOR) m_hIcon; %<p/s;eu
} 5eyB\>k,
QUZ+#*:s
void CCaptureDlg::OnCancel() DvLwX1(l
{ +7AH|v8
if(bTray) CY*GCkH
DeleteIcon(); i{:iRUC#
CDialog::OnCancel(); cF EO}
} H4T~Kv
#,1)@[
void CCaptureDlg::OnAbout() <u],R.S)
{ Bva2f:)K|
CAboutDlg dlg; .A_R6~::
dlg.DoModal(); ]O~$|Wk
} [~G1Rz\h
vl+bc[ i~
void CCaptureDlg::OnBrowse() L(k`1E
{
=}I=s@
CString str; Aeo=m}C;
BROWSEINFO bi; 9x8Vsd
char name[MAX_PATH]; %BT]h3dcSS
ZeroMemory(&bi,sizeof(BROWSEINFO)); u~JR]T
bi.hwndOwner=GetSafeHwnd(); a({N}ZDo
bi.pszDisplayName=name; Ro `Xs.X
bi.lpszTitle="Select folder"; Nz*,m'-1e
bi.ulFlags=BIF_RETURNONLYFSDIRS; -II03 S1
LPITEMIDLIST idl=SHBrowseForFolder(&bi); l[%=S!
if(idl==NULL) L`wr~E2u
return; q"S,<I<f
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4M6[5RAW{
str.ReleaseBuffer(); w-NTw2x,&
m_Path=str; >pJ#b=
if(str.GetAt(str.GetLength()-1)!='\\') ;kR=vv
m_Path+="\\"; 3J/l>1[
UpdateData(FALSE); )iK:BL*Nw
} GZn=Hgv8
K_:2sDCaN
void CCaptureDlg::SaveBmp() hd(TKFL^y
{ !h<O c!9
CDC dc; Gxxz4
dc.CreateDC("DISPLAY",NULL,NULL,NULL); B(} 'yY@%u
CBitmap bm; vM$hCV~N
int Width=GetSystemMetrics(SM_CXSCREEN); >,_0Mem2Rr
int Height=GetSystemMetrics(SM_CYSCREEN); 8$Zwk7 w8A
bm.CreateCompatibleBitmap(&dc,Width,Height); m~P30)
CDC tdc; [gZR}E
tdc.CreateCompatibleDC(&dc); gh
:5
CBitmap*pOld=tdc.SelectObject(&bm); JR&yaOws
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5v`lCu]
tdc.SelectObject(pOld); :)T*:51{#
BITMAP btm; 7xux%:BN
bm.GetBitmap(&btm); A;&YPHB
DWORD size=btm.bmWidthBytes*btm.bmHeight; /EegP@[
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _Y}cK|3
BITMAPINFOHEADER bih; ro3%VA=V
bih.biBitCount=btm.bmBitsPixel; -xN/H,xok
bih.biClrImportant=0; ukc
7Z
OQ
bih.biClrUsed=0; Tow! 5VAM
bih.biCompression=0; hn/yX|4c(
bih.biHeight=btm.bmHeight; &@BAVc z
bih.biPlanes=1; Ai^0{kF6
bih.biSize=sizeof(BITMAPINFOHEADER); \d]Y#j<
bih.biSizeImage=size; 4PkKL/E
bih.biWidth=btm.bmWidth; Q
8;JvCz
bih.biXPelsPerMeter=0; Dfc%
jWbA
bih.biYPelsPerMeter=0; ~t$ng l$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {{>,c}O /
static int filecount=0; /eXiWa sQ
CString name; WSv%Rxr8L
name.Format("pict%04d.bmp",filecount++); ,`k6@4
name=m_Path+name; /(u? k%Q
BITMAPFILEHEADER bfh; VZ">vIRyi|
bfh.bfReserved1=bfh.bfReserved2=0; 'iOaj0f
bfh.bfType=((WORD)('M'<< 8)|'B'); PBFpV8P,
bfh.bfSize=54+size; s1#A0%gx
bfh.bfOffBits=54; bKzG5|Qu
CFile bf; D&G?Klq
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HD2C^V2@M
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2Qh)/=8lM
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '$'a .q1q9
bf.WriteHuge(lpData,size); Zs-lN*u7.
bf.Close(); (\r^0>H
nCount++; /0fHkj/J=B
} L%<]gJtrO
GlobalFreePtr(lpData); ZJF+./vN
if(nCount==1) 4i}nk
T
m_Number.Format("%d picture captured.",nCount); q4G$I?4
else X Z3fWcw[
m_Number.Format("%d pictures captured.",nCount); 6%:~.ZfN
UpdateData(FALSE); ?$uF(>LD
} aSxDfYN=R
R?/xH=u>
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?~.:C'
{ cR,'aX
if(pMsg -> message == WM_KEYDOWN) 2+S+Y%~
{ 7'Hh^0<
if(pMsg -> wParam == VK_ESCAPE) #b:YY^{g_
return TRUE; gu~R4@3
if(pMsg -> wParam == VK_RETURN) B.;@i;7L
return TRUE; }aI>dHL
} P/^@t+KC
return CDialog::PreTranslateMessage(pMsg); 6BEpnw>p(
} R$A%Zh6
bmi",UZ:F
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yHlQKI
{ 11Qi
_T\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ pzUr9
SaveBmp(); (NDC9Lls
return FALSE; v6[VdWOx5
} fo`R=|L[
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ , /jHhKW
CMenu pop; 5JK'2J&
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %g89eaEZ
CMenu*pMenu=pop.GetSubMenu(0); ],~[ ^0
pMenu->SetDefaultItem(ID_EXITICON); -1NR]#P'
CPoint pt; @g+v2(f2v
GetCursorPos(&pt); 0=t2|,}
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .J&89I]U
if(id==ID_EXITICON) S'w}Ir
DeleteIcon(); <sM_zoprc
else if(id==ID_EXIT) U>bIQk"4
OnCancel(); 'irwecd8
return FALSE; `
"-P g5
} GM1.pVb
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n9k
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Nh/i'q/
AddIcon(); *qAG0EM|
return res; vWrTB
} ?EPHq,
E
WS(m#WFQr
void CCaptureDlg::AddIcon() f8=qnY2j
{ d#$Pf=}
NOTIFYICONDATA data; 5L~lF8
data.cbSize=sizeof(NOTIFYICONDATA); IMMsOl
CString tip;
Soe2Gq
tip.LoadString(IDS_ICONTIP); f7!48,(fB
data.hIcon=GetIcon(0); % WXl*
data.hWnd=GetSafeHwnd(); )Y'g;
strcpy(data.szTip,tip); ZNk[Jn
[.
data.uCallbackMessage=IDM_SHELL; ,/TmTX--d
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NZADHO@0
data.uID=98; .f. tPm
Shell_NotifyIcon(NIM_ADD,&data); nN@
Ch
ShowWindow(SW_HIDE); "xHK*
bTray=TRUE; U 0~BcFpD
} {D(l#;,iX2
Qt_KUtD
void CCaptureDlg::DeleteIcon() "lC>_A
{ "Ms{c=XPK
NOTIFYICONDATA data; ? u".*!%
data.cbSize=sizeof(NOTIFYICONDATA); iC^91!<
data.hWnd=GetSafeHwnd(); w`+-xT%
data.uID=98; Hg8
4\fA
Shell_NotifyIcon(NIM_DELETE,&data); bj 8pqw|;
ShowWindow(SW_SHOW); z7L+wNYwg
SetForegroundWindow(); !wfUD2K1
ShowWindow(SW_SHOWNORMAL); uTPAf^|
bTray=FALSE; i O? f&u
} `,/5skeJ
f\q5{#"z
void CCaptureDlg::OnChange() I8B0@ZtV
{ G|-RscPe
RegisterHotkey();
< .e4
} f#!nj]}#
1q5S"=+W[
BOOL CCaptureDlg::RegisterHotkey() Q8QB{*4
{ vdB2T2F
UpdateData(); i^Jw`eAmT
UCHAR mask=0; F^%\AA]8
UCHAR key=0; PO0Od z
if(m_bControl) m$(OQ,E
mask|=4; Mw-L?j0o[k
if(m_bAlt) W?P4oKsql*
mask|=2; 4${3e
Sg_
if(m_bShift) _5(p=Zc
mask|=1; wL>*WLfR
key=Key_Table[m_Key.GetCurSel()]; #2:?N8vz*
if(bRegistered){ Lp@Al#X55
DeleteHotkey(GetSafeHwnd(),cKey,cMask); !TY0;is
bRegistered=FALSE; *b0z/6
} z
j#<X
cMask=mask; S
Te8*=w
cKey=key; F0zaA
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); YPq:z"`-y4
return bRegistered; M2d&7>N
} @(E6P;+{
;V?(j3b[
四、小结 0.nkh6?
"iX\U'`
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。