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:
E^.
=^bR
b%,`;hy{ 一、实现方法
-vC?bumR% }'
t*BaU 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:
Djf,#&j!3 o,RLaS,BK' #pragma data_seg("shareddata")
lq!l{[Xp HHOOK hHook =NULL; //钩子句柄
yS-owtVCGF UINT nHookCount =0; //挂接的程序数目
`_v|O{DC{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
1%6}m`3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
VN8ao0^d;d static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
sxLq'3( static int KeyCount =0;
!P0Oq)q static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
?wx|n_3<: #pragma data_seg()
1cdM^k C,D~2G 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。
Z5o6RTi #yVY!+A 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:
izi=`;=D^ `W8dayZt BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ABp/uJI) cKey,UCHAR cMask)
5<ycF_ {
u|D_"q~+6 BOOL bAdded=FALSE;
A3N<;OOk for(int index=0;index<MAX_KEY;index++){
AHhck?M^ if(hCallWnd[index]==0){
9_GR\\ hCallWnd[index]=hWnd;
cv["Ps#;`W HotKey[index]=cKey;
YX_p3 HotKeyMask[index]=cMask;
wy$9QN bAdded=TRUE;
lH ^[b[ KeyCount++;
R@r"a&{/ break;
r#pC0Yj!3 }
_`zj^*% }
7>J8\= return bAdded;
#\$R^u]! }
5!G}*u. //删除热键
I%whM~M1+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3say&|kJ {
~$i36" BOOL bRemoved=FALSE;
70:a2m for(int index=0;index<MAX_KEY;index++){
BUcze\+ if(hCallWnd[index]==hWnd){
e;<=aa)}? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
K/jC>4/c/ hCallWnd[index]=NULL;
{@oYMO~ HotKey[index]=0;
kGMI
? HotKeyMask[index]=0;
i9oi}$;J bRemoved=TRUE;
/E@| KeyCount--;
$R7n1 break;
\5Jpr'mY5 }
DxT8;`I% }
gX34'<Z }
n-{G19? return bRemoved;
p/xxoU }
Nq)=E[$ s7<x~v+^ FHI`/ DLL中的钩子函数如下:
RI"A'/56 -lm\~VZT3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
0p_/eWww- {
nj~1y') BOOL bProcessed=FALSE;
C_Y^< if(HC_ACTION==nCode)
YzSUJ=0/ {
8|w_PP1oE if((lParam&0xc0000000)==0xc0000000){// 有键松开
iP;X8'< BC switch(wParam)
Qsc%qt-l {
FMuM:%&J] case VK_MENU:
{|6(_SM| MaskBits&=~ALTBIT;
l=ZhHON break;
EOjo>w> case VK_CONTROL:
k9.2*+vvg MaskBits&=~CTRLBIT;
}}v;V*_V break;
[|\~-6"7N| case VK_SHIFT:
8|`4D 'Ln MaskBits&=~SHIFTBIT;
jnX9] PkJ break;
)G0a72 default: //judge the key and send message
XFPWW , break;
DGTSk9iK( }
Dg4?,{c9W for(int index=0;index<MAX_KEY;index++){
rm NqS+t if(hCallWnd[index]==NULL)
pUWj,&t continue;
2`Xy}9N/Y if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z)r)w?A {
HP2]b?C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#m6 eG&a bProcessed=TRUE;
#n7uw }
"EQ-`b=I4 }
BM#cosV7%h }
"8aw=3A else if((lParam&0xc000ffff)==1){ //有键按下
j9sf~}D> switch(wParam)
[:
X {
?C6iJnm case VK_MENU:
o jzO?z MaskBits|=ALTBIT;
2![.Kbqa% break;
6yKr5t H4 case VK_CONTROL:
6e$(-ai MaskBits|=CTRLBIT;
lN)U8 break;
cejSGsW6q case VK_SHIFT:
T&I*8 R~ MaskBits|=SHIFTBIT;
!j6]k^ra break;
NWSBqL5v default: //judge the key and send message
.
Yg)|/ break;
>z1RCQWju }
RZ9vQ\X
U) for(int index=0;index<MAX_KEY;index++){
7E4=\vM if(hCallWnd[index]==NULL)
vAi
kd#C) continue;
T@uY6))>F if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<SUjz}_Oa: {
Iw8;",e2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
tB4- of3+ bProcessed=TRUE;
a5:Q%F<! }
k`6T% [D] }
Zg%U4m: }
iVzv/Lqm1 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
~oh=QakW for(int index=0;index<MAX_KEY;index++){
-@-cG\{ if(hCallWnd[index]==NULL)
dy;Ue5 continue;
C ".&m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ZJ@M}-4O1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p
mcy(< //lParam的意义可看MSDN中WM_KEYDOWN部分
J
(Yfup }
.G#S*L }
iV[g.sP- }
KD*,u{v; return CallNextHookEx( hHook, nCode, wParam, lParam );
!9DqW&8 }
' D+h_*H ~S15tZ $ 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:
.HF+JHIUu %p)6m2Sb BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
|j$&W;yC BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
@;M( oFS9 3Ln~"HwP 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:
g= k}6"F~ i2/:'
i LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
.{LFc|Z[ {
yv^j~ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
@dV'v{:, {
G eN('0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
v{^_3
] SaveBmp();
wP- pFc return FALSE;
8MGtJ'. }
~cVFCM …… //其它处理及默认处理
hWwh`Vw% }
1+v&SU C2Fklp6 Z!60n{T79c 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。
V|ax(tHv 2cr~/,YY 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。
^[Cpu_]D
;?1H& 二、编程步骤
UP}Ys* RyKsM. 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";
V03U"eI=" aErms-~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
wGD".CS0 q
[Rqy !, 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;
c_<m8b{AEF X"YH49? 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;
R:P'QM Wc ]BQn 5、 添加代码,编译运行程序。
\%z#|oV#< /Y:&307q 三、程序代码
2i*-ET mBSa*s) ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
W#E`h #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
*P_(hG&c #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
xGCW-YR9 #if _MSC_VER > 1000
!*ct3{m #pragma once
>
$DMVtE0 #endif // _MSC_VER > 1000
w d2GKq! #ifndef __AFXWIN_H__
3r!6Z5P7{' #error include 'stdafx.h' before including this file for PCH
/Pv
d[oF #endif
n]?Yv E #include "resource.h" // main symbols
AHc:6v^ class CHookApp : public CWinApp
:oYu+cQ {
i-w^pv' public:
q%%8oaEI CHookApp();
NypM+y // Overrides
@&t';"AE // ClassWizard generated virtual function overrides
hJ\IE?+ //{{AFX_VIRTUAL(CHookApp)
1r;]== public:
k'E3{8<! virtual BOOL InitInstance();
Mh"DPt9@J virtual int ExitInstance();
%yX?4T;b //}}AFX_VIRTUAL
2jV.\C k //{{AFX_MSG(CHookApp)
losm< // NOTE - the ClassWizard will add and remove member functions here.
[ Hw // DO NOT EDIT what you see in these blocks of generated code !
rXc-V},az8 //}}AFX_MSG
L|.q19b* DECLARE_MESSAGE_MAP()
5wYYYo= };
=/Pmi_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
v=e`e68U~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
mIgc)" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
+>h}Uz BOOL InitHotkey();
{I0b%>r= BOOL UnInit();
+?Vj}p; #endif
q&OF?z7H u+%Ca,6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/~[+' #include "stdafx.h"
$mOVo'2 #include "hook.h"
4^cDp!8 #include <windowsx.h>
g"aWt%
P #ifdef _DEBUG
^F2OTz4n #define new DEBUG_NEW
@TF^6)4f #undef THIS_FILE
Uyf<:8U\ static char THIS_FILE[] = __FILE__;
L[o;@+32 #endif
m}&cX Y #define MAX_KEY 100
vaN}M)W/ #define CTRLBIT 0x04
u U Xj #define ALTBIT 0x02
3fPd|F.kF #define SHIFTBIT 0x01
jN
9|q #pragma data_seg("shareddata")
"&;8U. HHOOK hHook =NULL;
n " ?It UINT nHookCount =0;
FeOo;|a static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
,PC'xrEo static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
IlQNo 1 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
ATx6YP@7~ static int KeyCount =0;
mOgsO
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&AM<H}> #pragma data_seg()
7R9.g6j HINSTANCE hins;
qNb|6/DG void VerifyWindow();
fd~a\5%e BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
+@*}_%^l" //{{AFX_MSG_MAP(CHookApp)
P7ktr?V0a // NOTE - the ClassWizard will add and remove mapping macros here.
9D@
$Y54 // DO NOT EDIT what you see in these blocks of generated code!
ML@-@BaN //}}AFX_MSG_MAP
0qP&hybL[( END_MESSAGE_MAP()
rP$vZ^/c RO.GD$ 3n CHookApp::CHookApp()
z\64Qpfm {
Axp#8 // TODO: add construction code here,
b{Srd3 // Place all significant initialization in InitInstance
.x\fPjB }
+6paM -+MGs]), CHookApp theApp;
v`& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
EC9D.afy& {
u\LG_/UJV1 BOOL bProcessed=FALSE;
:sO^b*e / if(HC_ACTION==nCode)
;VM',40 {
VGFWF3s if((lParam&0xc0000000)==0xc0000000){// Key up
8/q6vk>< switch(wParam)
j7r! N^ {
$p_FrN{ case VK_MENU:
">pW:apl% MaskBits&=~ALTBIT;
xW|^2k break;
&G63ReW7 @ case VK_CONTROL:
55lL aus MaskBits&=~CTRLBIT;
9gjI;*(z1 break;
[f`^+,U case VK_SHIFT:
9J>b6 MaskBits&=~SHIFTBIT;
u=j|']hp#& break;
p#-ov-znp default: //judge the key and send message
+Smt8O<N break;
H<tk/\C }
bOIVe for(int index=0;index<MAX_KEY;index++){
e| AA7 if(hCallWnd[index]==NULL)
dFdll3bC continue;
z9> yg_Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
MYVUOd, {
CR*9-Y93 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
nq'vq]] bProcessed=TRUE;
agQ5%t# }
7lP3\7wD@9 }
!AR$JUnX }
G'|Emu=4 else if((lParam&0xc000ffff)==1){ //Key down
*~p~IX{ switch(wParam)
:V)W?~Z7B {
e"jA#Y # case VK_MENU:
m~K[+P MaskBits|=ALTBIT;
$D,m o2I break;
#xWC(*Ggp case VK_CONTROL:
$Cu/!GA4.> MaskBits|=CTRLBIT;
*q5'~)W< break;
E)(`Z0 case VK_SHIFT:
1'|6IR1' MaskBits|=SHIFTBIT;
#=WDJT: break;
T7;)HFGeW default: //judge the key and send message
%iPu51+= break;
Xco$
yF% }
&`rV{%N" for(int index=0;index<MAX_KEY;index++)
^qpa[6D6x {
ArkFC if(hCallWnd[index]==NULL)
,5\:\e0H continue;
}?P~qJ|1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@LY 5]og {
D#%J|| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
3)f=Z2U> bProcessed=TRUE;
Q, E!Ew3 }
$ql-"BB }
*D1fSu! }
^_<>o[qE if(!bProcessed){
Q:+Y-&||" for(int index=0;index<MAX_KEY;index++){
hMJ \a if(hCallWnd[index]==NULL)
;U<)$5 continue;
RCt)qh+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
98C~%+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Fga9 }
3w )S=4lB }
~QdwoeaD }
+Z XGT return CallNextHookEx( hHook, nCode, wParam, lParam );
Fc}wuW }
rOY^w9! {s8''+Q#(- BOOL InitHotkey()
"!)8bTW {
{CH\TmSz if(hHook!=NULL){
9[N'HpQ3 nHookCount++;
^OG^%
x" return TRUE;
5*buRYck0 }
jTws0=F* else
IJ,,aCj4g hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
LWbWj ^ if(hHook!=NULL)
.WL507*"Ce nHookCount++;
mC~W/KReA return (hHook!=NULL);
(I.uQP~H }
`M>{43dj BOOL UnInit()
Lu:!vTRmw {
b&~uK"O'7d if(nHookCount>1){
B_cn[?M nHookCount--;
0'97af return TRUE;
*MagicA }
=X&h5;x' BOOL unhooked = UnhookWindowsHookEx(hHook);
QHs=Zh;" if(unhooked==TRUE){
2L<TqC{,- nHookCount=0;
`ss]\46> hHook=NULL;
`*oLEXYN }
66L*6O4 return unhooked;
<2cq 0*$ }
FeV=4tsy '&<-,1^L BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5 (H; x74 {
#gN{8Yk> BOOL bAdded=FALSE;
X<9DE!/) for(int index=0;index<MAX_KEY;index++){
]}v`#-Px( if(hCallWnd[index]==0){
RM<\bZPc hCallWnd[index]=hWnd;
wFqz.HoB HotKey[index]=cKey;
CKBi-q FH HotKeyMask[index]=cMask;
?tA-`\E bAdded=TRUE;
Y6N+,FAk+J KeyCount++;
0>e>G (4(8 break;
},Z-w_H }
dfJ7Dhn }
k6Tpaf^ return bAdded;
,}2j
Fb9z4 }
ONfJ"Rp3 'xi.. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#&8Opo( {
U_8I$v-~ BOOL bRemoved=FALSE;
S i>TG
for(int index=0;index<MAX_KEY;index++){
?=4t~\g? if(hCallWnd[index]==hWnd){
1b!l+ 8! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
blPC"3}3Vd hCallWnd[index]=NULL;
#&5\1Qu HotKey[index]=0;
O0{v`|w9+ HotKeyMask[index]=0;
g1{wxBFE bRemoved=TRUE;
RI*%\~6t? KeyCount--;
w6yeX<!ll break;
$7bmUQ| }
6?iP z?5 }
<A&R%5Vs }
e.kt]l return bRemoved;
X'F$K!o*,: }
:OZhEBL&b KWH void VerifyWindow()
|V7a26h {
.KLuGb3JJ for(int i=0;i<MAX_KEY;i++){
|S}*M<0 if(hCallWnd
!=NULL){ j w462h
if(!IsWindow(hCallWnd)){ K;ML'
hCallWnd=NULL; 18HHEW{
HotKey=0; fh3
6
HotKeyMask=0; '[E_7$d
KeyCount--; !58JK f
} LYFvzw>M
} n 3]y$wK
} =>J#_Pprn
} <KA@A}
<am7t[G."
BOOL CHookApp::InitInstance() <>oW f
{ Uwk|M?94
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2fk
hins=AfxGetInstanceHandle(); "8]170
InitHotkey(); ,m8*uCf
return CWinApp::InitInstance(); u5ygbCm
} E=QQZ\w
e-CW4x
int CHookApp::ExitInstance() [)pT{QA
{ |{K:.x#^
VerifyWindow(); 4{g|$@s(
UnInit(); *2MTx
return CWinApp::ExitInstance(); "LWuN>
} yw<xv-Q=i
UXJl;Mb
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file W|e>
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gEsR-A!m
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $ZO<8|bW
#if _MSC_VER > 1000 Se8y-AL6x>
#pragma once EYG E#C;
d
#endif // _MSC_VER > 1000 tW>R 16zq
E=NY{| >
class CCaptureDlg : public CDialog |Ze}bM=N
{ a6E"
// Construction uek3Y[n
public: [#Vr)\n
BOOL bTray; |plo65
BOOL bRegistered; f :5/y^M&
BOOL RegisterHotkey(); X~3P?O]kFv
UCHAR cKey; 4/WCs$
UCHAR cMask; /nFw
void DeleteIcon(); pNFIO
t:(
void AddIcon(); qEr[fC@x
UINT nCount; EIQy?ig86
void SaveBmp(); Yj\yO(o/
CCaptureDlg(CWnd* pParent = NULL); // standard constructor m4>oE|\
// Dialog Data h_yR$H&tX
//{{AFX_DATA(CCaptureDlg) S(h*\we
enum { IDD = IDD_CAPTURE_DIALOG }; J)|K/W9
CComboBox m_Key; Gx_e\fe-/
BOOL m_bControl; b.*4RL
BOOL m_bAlt; pw yl,A
BOOL m_bShift; wR4u}gb#q
CString m_Path; j]O[I^5
CString m_Number; ix @rq#
//}}AFX_DATA RgA4@J#
// ClassWizard generated virtual function overrides jgw'MpQm{
//{{AFX_VIRTUAL(CCaptureDlg) ]?$y}
public: Aq'E:/
virtual BOOL PreTranslateMessage(MSG* pMsg); E]?HCRa5R
protected: Sr 4 7u{n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
89=JC[c
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '|N4fbZd
//}}AFX_VIRTUAL IFofFXv_
// Implementation G3^]Wwu
protected: NOp=/
HICON m_hIcon; &(^u19TKl
// Generated message map functions X]"OW
//{{AFX_MSG(CCaptureDlg) 1>x@1Mo+K
virtual BOOL OnInitDialog(); Vzvw/17J
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g*r;( H>e
afx_msg void OnPaint(); =w$"wzc
afx_msg HCURSOR OnQueryDragIcon(); %E7.$Gj%
virtual void OnCancel(); z2V8NUn
afx_msg void OnAbout(); pY>-N
afx_msg void OnBrowse(); G0Tc}_o<Y
afx_msg void OnChange(); :vyf-K74M
//}}AFX_MSG b\m(0/x
DECLARE_MESSAGE_MAP() kdPm # $-
}; w!w _`7[
#endif 6FIoWG"x
Rbc2g"]
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FXEfD"
#include "stdafx.h" DK_v{R
#include "Capture.h" u!Nfoq&'u
#include "CaptureDlg.h" V?dK *8s
#include <windowsx.h> g]
C3lf-
#pragma comment(lib,"hook.lib") ^-*Tn
#ifdef _DEBUG ixHZX<6zYT
#define new DEBUG_NEW GiO#1gA
#undef THIS_FILE OrJlHMz
static char THIS_FILE[] = __FILE__; )TG0m= *
#endif LNxE-Dp
#define IDM_SHELL WM_USER+1 ]l7\Zq
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )u/
^aK53^
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NV(4wlh)y
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YGV#.
class CAboutDlg : public CDialog _JIUds5
{ 4yZ+,hqJ<9
public: l%U_iqL&
CAboutDlg(); KM(9&1/
// Dialog Data jP.b oj_u*
//{{AFX_DATA(CAboutDlg) @&xaaqQ-
enum { IDD = IDD_ABOUTBOX }; g74z]Uj.B
//}}AFX_DATA pW--^aHu
// ClassWizard generated virtual function overrides +y4AUU:Q
//{{AFX_VIRTUAL(CAboutDlg) ^pV>b(?qw
protected: bKMR7&e.Ep
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~TFYlV
//}}AFX_VIRTUAL jo3}]KC !
// Implementation H?(SSL
protected: KPd C9H
//{{AFX_MSG(CAboutDlg) "zIq)PY
//}}AFX_MSG D62
NU
DECLARE_MESSAGE_MAP() <6O_t,K]
}; >aC\_Mc
D<3V#Opw
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ie~fQ!rf
{ h k!,
//{{AFX_DATA_INIT(CAboutDlg) QT= ,En
//}}AFX_DATA_INIT .0fh>kQ
} 9}jq`xSL
;,vL
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <RPoQ'.^
{ b' oGt,
CDialog::DoDataExchange(pDX); /`O]etr`d
//{{AFX_DATA_MAP(CAboutDlg) 1H,tP|s
//}}AFX_DATA_MAP TFYT vUn
} G!VF*yW8
u!3]RGJ
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K7xWE,y
//{{AFX_MSG_MAP(CAboutDlg) $FusDdCv3
// No message handlers d
O46~
//}}AFX_MSG_MAP {29S`-|P
END_MESSAGE_MAP() #DK3p0d
waWKpk1Wo
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^g-t#O lD?
: CDialog(CCaptureDlg::IDD, pParent) zIm_7\e
{ J1]w*2
//{{AFX_DATA_INIT(CCaptureDlg) N>pmhskN?
m_bControl = FALSE; H1%[\X?=
m_bAlt = FALSE; g;!@DVF$
m_bShift = FALSE; ?X#/1X%u:
m_Path = _T("c:\\"); @6
;oN
m_Number = _T("0 picture captured."); r2GK_$vd
nCount=0; r -q3+c^+
bRegistered=FALSE; iA3>X-x
bTray=FALSE; ){
//}}AFX_DATA_INIT }uI7\\S
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #3Ej0"A@-B
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !H1tBg]5
} rx6-~0!eI=
A6NxM8ybn+
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ed^uA+D
{ {s8U7rmML
CDialog::DoDataExchange(pDX); << ;HY}s
//{{AFX_DATA_MAP(CCaptureDlg) 7{An@hNh
DDX_Control(pDX, IDC_KEY, m_Key); LZc$:<J<6
DDX_Check(pDX, IDC_CONTROL, m_bControl); lTr*'fX
DDX_Check(pDX, IDC_ALT, m_bAlt); a\{1UD
DDX_Check(pDX, IDC_SHIFT, m_bShift); PwB g
DDX_Text(pDX, IDC_PATH, m_Path); % nmY:}um
DDX_Text(pDX, IDC_NUMBER, m_Number); [l':G ]
//}}AFX_DATA_MAP M .)}e7
} ^6aS]t
*K,hrpYR
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)
$' (QTEM
//{{AFX_MSG_MAP(CCaptureDlg) ) Kc%8hBv
ON_WM_SYSCOMMAND() 6mu<&m@
ON_WM_PAINT() )W1(tEq59
ON_WM_QUERYDRAGICON() BU9J_rCIv
ON_BN_CLICKED(ID_ABOUT, OnAbout) S~k*r{?H})
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) q1f=&kGX~
ON_BN_CLICKED(ID_CHANGE, OnChange) .B'UQ|NR
//}}AFX_MSG_MAP !0ce kSesr
END_MESSAGE_MAP() Y8%0;!T
|/;U)M
BOOL CCaptureDlg::OnInitDialog() { eEC:[
{ \+iu@C
CDialog::OnInitDialog(); @GG(7r\/B
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7}?k^x,1
ASSERT(IDM_ABOUTBOX < 0xF000); ?Ml%$z@b?
CMenu* pSysMenu = GetSystemMenu(FALSE); Z6Nj<2u2
if (pSysMenu != NULL) zb5N,!%r
{ ,M)k7t:
CString strAboutMenu; tx0Go'{
strAboutMenu.LoadString(IDS_ABOUTBOX); 20UqJM8Ot
if (!strAboutMenu.IsEmpty()) mG831v?
{ [IX*sr
pSysMenu->AppendMenu(MF_SEPARATOR); v<;: 0
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gEv-> pc
} OE'K5oIM
} LY-lTr@A^
SetIcon(m_hIcon, TRUE); // Set big icon 2yN%~C?$
SetIcon(m_hIcon, FALSE); // Set small icon a`H\-G
m_Key.SetCurSel(0); _+twqi
RegisterHotkey(); `,wcQ
CMenu* pMenu=GetSystemMenu(FALSE); u12zRdn
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8RdP:*HY
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); y(bsCsV&
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); yjEI/9_
return TRUE; // return TRUE unless you set the focus to a control $ph0ag+
} [kbC'Eh*
$]@O/[
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gbm0H-A:*
{ }B y)y;~
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3{N\A5~
{ c 9rVgLqn!
CAboutDlg dlgAbout; F=XF]
dlgAbout.DoModal(); ]7a;jNQu
} [6D>f?z
else FU%~9NKX
{ GR,J0LT
CDialog::OnSysCommand(nID, lParam); ?75\>NiR
} dQ: ?<zZ
} K7IyCcdB
Kb}MF9?:e
void CCaptureDlg::OnPaint() C"w,('~@kW
{ NQ?x8h3
if (IsIconic()) I-xwJi9?,
{ Kw)KA^KF
CPaintDC dc(this); // device context for painting ~&1KrUu&
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *^'wFbaBO
// Center icon in client rectangle ~32Pjk~
int cxIcon = GetSystemMetrics(SM_CXICON); 6wPeb~{
int cyIcon = GetSystemMetrics(SM_CYICON); FbveI4
CRect rect; /H')~!Yz
GetClientRect(&rect); 2Ok?@ZdjA{
int x = (rect.Width() - cxIcon + 1) / 2; mc?';dEG
int y = (rect.Height() - cyIcon + 1) / 2; a`#S|'oatC
// Draw the icon MDk*j,5V
dc.DrawIcon(x, y, m_hIcon); +%P t_
} Vo%Yf9C
else *|mz_cKu
{ |U#DUqw
CDialog::OnPaint(); wG+=}1X
} o]A XT8
} ;Xqn-R
d7* CwY9"
HCURSOR CCaptureDlg::OnQueryDragIcon() Yi 6Nw+$
{ kl"
]Nw'C
return (HCURSOR) m_hIcon; -Q#o)o
} HOfF"QAR$
qNpu}\L
void CCaptureDlg::OnCancel() Vt'L1Wr0v
{ jZRh KT
if(bTray) KxY$PgcC
DeleteIcon(); e#.\^
CDialog::OnCancel(); E#8_hT]5
} gI)u}JX
+ 3h`UF
void CCaptureDlg::OnAbout() "%VbI P
{ [[w2p
CAboutDlg dlg; Km,*)X.-5
dlg.DoModal(); X(]Zr
} [B,'=,Hbs
%swR:Bv
void CCaptureDlg::OnBrowse() <s_=-"
il
{ ?4 qkDtm
CString str; =+<d1W`>0
BROWSEINFO bi; j&WL*XP&5
char name[MAX_PATH]; GMb(10T`
ZeroMemory(&bi,sizeof(BROWSEINFO)); &UL_bG}
bi.hwndOwner=GetSafeHwnd(); u_LY\'n
bi.pszDisplayName=name; $Z ]z
bi.lpszTitle="Select folder"; >B_n/v3P(M
bi.ulFlags=BIF_RETURNONLYFSDIRS; #|Oj]bd(=
LPITEMIDLIST idl=SHBrowseForFolder(&bi); A[`G^$
if(idl==NULL) aVwH
return; P/MM
UmO
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); sK&,):"]R
str.ReleaseBuffer(); X"j>=DEX
m_Path=str; kh3<V'k]
if(str.GetAt(str.GetLength()-1)!='\\') !2$ z *C2;
m_Path+="\\"; %k2FPmA6
UpdateData(FALSE); yxwW j>c
} /Wu |)tx
U'y,YtF@
void CCaptureDlg::SaveBmp() :I
\9YzSs@
{ @DuK#W"E u
CDC dc; 03([@d6<E
dc.CreateDC("DISPLAY",NULL,NULL,NULL); mRwT_(;t
CBitmap bm; ^P?vkO"pB?
int Width=GetSystemMetrics(SM_CXSCREEN); vZu~LW@1
int Height=GetSystemMetrics(SM_CYSCREEN); -f?A h
bm.CreateCompatibleBitmap(&dc,Width,Height); ^,TTwLy-t
CDC tdc; R-
tdc.CreateCompatibleDC(&dc); <'+ %\
CBitmap*pOld=tdc.SelectObject(&bm); +{$QAjW(/
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \3zp)J
tdc.SelectObject(pOld); rQJ"&CapT
BITMAP btm; K"\MU
bm.GetBitmap(&btm); 6):Xzx,
DWORD size=btm.bmWidthBytes*btm.bmHeight; wzh]97b
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); GX?*1
BITMAPINFOHEADER bih; Km!nM$=k
bih.biBitCount=btm.bmBitsPixel; R*9NR,C
bih.biClrImportant=0; wAFW*rO5o
bih.biClrUsed=0; v$Uhm</|19
bih.biCompression=0; Gf0,RH+
bih.biHeight=btm.bmHeight; u[")*\CP
bih.biPlanes=1; S@xXq{j
bih.biSize=sizeof(BITMAPINFOHEADER); pzhl*ss"6
bih.biSizeImage=size; nNaXp*J
bih.biWidth=btm.bmWidth; RV+E^pkp$
bih.biXPelsPerMeter=0; u1Ek y/e-
bih.biYPelsPerMeter=0; U>P|X=)
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \4{2eU
static int filecount=0; qaVy.
CString name; ;:mu}
name.Format("pict%04d.bmp",filecount++); DG[%Nhle
name=m_Path+name; {q3:Z{#>7
BITMAPFILEHEADER bfh; ~e">_;k6
bfh.bfReserved1=bfh.bfReserved2=0; +th%enRB
bfh.bfType=((WORD)('M'<< 8)|'B'); }gGkV]
bfh.bfSize=54+size; A\AT0th
bfh.bfOffBits=54; (UYF%MA}"
CFile bf; 0 [8=c&F
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?WpenUWk
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )R?;M
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]]BOk
bf.WriteHuge(lpData,size); {2
%aCCV
bf.Close(); F[Q!d6
nCount++; j U[
O
} a{'Z5ail
GlobalFreePtr(lpData); @I-Lv5
if(nCount==1) E4i0i!<z
m_Number.Format("%d picture captured.",nCount); QA;!caNp
else Tycq1i^
m_Number.Format("%d pictures captured.",nCount); &(blN.2
UpdateData(FALSE); bMKL1+y(
} + G;LX'B
>&S0#>wmyG
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ~AZWds(,N
{ z;Q<F
if(pMsg -> message == WM_KEYDOWN) 2i7e#
{ 8)yI<`q6
if(pMsg -> wParam == VK_ESCAPE) 5$rSEVg9
return TRUE; tX%`#hb?s
if(pMsg -> wParam == VK_RETURN) 7N=-Y>$X
return TRUE; z@Hp,|Vy[
} j_cs;G: "
return CDialog::PreTranslateMessage(pMsg); cz/Q/%j$/
} z[EFQ^*>
yT8=l"-[G
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +jP~s
{ WYrI |^[>
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'ZP)cI:+X
SaveBmp(); YB,t0%vTJw
return FALSE; Sw[{JB;y,
} ,Hn^z<f
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p'94SXO_
CMenu pop; RA O`i>@
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9GLb"6+PK
CMenu*pMenu=pop.GetSubMenu(0); [10zTU`
pMenu->SetDefaultItem(ID_EXITICON); en*d/>OVJ
CPoint pt; o0It82?RN
GetCursorPos(&pt); mXzrEI
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %Ym^{N
if(id==ID_EXITICON) ?rYT4vi
DeleteIcon(); b)#Oc,
else if(id==ID_EXIT) ;GGK`V
OnCancel(); 'gso'&Uaj
return FALSE; :dI\z]Y(
} CC^E_j T
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %^]?5a!
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) As&vFt P
AddIcon(); #Q"O4 b:8
return res; w
ej[+y-
} %A/_5;PZ/
1|r,dE2k9
void CCaptureDlg::AddIcon() sTRJ:fR
{ @Xp~2@I=ls
NOTIFYICONDATA data; 3AcD,,M>>
data.cbSize=sizeof(NOTIFYICONDATA); eqAW+Ptx
CString tip; q'Wr[A40j
tip.LoadString(IDS_ICONTIP); xdvh-%A4
data.hIcon=GetIcon(0); &>g'$a<[
data.hWnd=GetSafeHwnd(); 0k,-; j,
strcpy(data.szTip,tip); 790-)\:CY
data.uCallbackMessage=IDM_SHELL; 2";SJF'5\
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; a2 +~;{?g
data.uID=98; J% H;%ROx
Shell_NotifyIcon(NIM_ADD,&data); _+l1b"^s1
ShowWindow(SW_HIDE); p[AO'
xx
bTray=TRUE; rQ`i8GF
} l^MzN
.Dg*\ h
void CCaptureDlg::DeleteIcon() kzn[
=P
{ Hu3wdq
NOTIFYICONDATA data; [U, ?R
data.cbSize=sizeof(NOTIFYICONDATA); p>v U?eF
data.hWnd=GetSafeHwnd(); "KX=ow#z|
data.uID=98; IuF_M<d,
Shell_NotifyIcon(NIM_DELETE,&data); Nes=;%&]G
ShowWindow(SW_SHOW); cvd\/pG)
SetForegroundWindow(); mLV[uhq
ShowWindow(SW_SHOWNORMAL); 4QOEw-~w&s
bTray=FALSE; An*~-u9m
} `Z"Q^
*Lqg=9kzr
void CCaptureDlg::OnChange() 7JJ/D4uT
{ wIB`%V
RegisterHotkey(); "XgmuSQ!
} b89a)k>^g
$j}OB6^I
BOOL CCaptureDlg::RegisterHotkey() \%Ves@hG>
{ 6z0@I*
UpdateData(); XQ%4L-rhN
UCHAR mask=0; YKmsQ(q`N
UCHAR key=0; %WTEv?I{Ga
if(m_bControl) ev1 W6B-a
mask|=4; yXI >I
if(m_bAlt) 'H8(=9O1d
mask|=2; ",aTWQgN
if(m_bShift) tVrY3)c
mask|=1; YOr:sb
key=Key_Table[m_Key.GetCurSel()]; F!zP<A"
if(bRegistered){ >MK>gLg}!
DeleteHotkey(GetSafeHwnd(),cKey,cMask); =@2FX&&E_
bRegistered=FALSE; 7>XDNI
} c;0Vs,DUmG
cMask=mask; j>Iaq"
cKey=key; =OIw*L8C"I
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qy)_wM
return bRegistered; BrRL7xX
} K~=UUB
g_5Q A)4x
四、小结 yz8mP3"c:o
y[B>~m8$
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。