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:
z1K}] z%
=6sA49~M 一、实现方法
M1Frn n lc:dKGF6 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:
(plsL
E43Gk!/|( #pragma data_seg("shareddata")
\*wQ%_N5 HHOOK hHook =NULL; //钩子句柄
~ z< &vQ= UINT nHookCount =0; //挂接的程序数目
#`g..3ey static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
E$4_.Z8sRw static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
EgYM][:UU static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
M0B6v}^H static int KeyCount =0;
^(Y}j8sj static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
\68x]q[ #pragma data_seg()
@nh*H{ O BCH%\;g 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
<P%<EgOE FX->_}kL= DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
9=l6NNe)| i"B q*b@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
wU"0@^k]< cKey,UCHAR cMask)
k2-:!IE {
o 94]:$=~ BOOL bAdded=FALSE;
brdfjE8 for(int index=0;index<MAX_KEY;index++){
,GU|3 if(hCallWnd[index]==0){
un&Z'
.
hCallWnd[index]=hWnd;
(
!THd HotKey[index]=cKey;
'XbrO|% HotKeyMask[index]=cMask;
E7CeE6U bAdded=TRUE;
I6.!0.G KeyCount++;
bV3az/U break;
I7S#vIMXR. }
.5tE, (<? }
@W|N1,sp
return bAdded;
!5wuBJ0 }
yF _@^V //删除热键
C.#\Pz0 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
u2FD@Xq? {
0afDqvrC6 BOOL bRemoved=FALSE;
z_ 01*O for(int index=0;index<MAX_KEY;index++){
YF4?3K0F:k if(hCallWnd[index]==hWnd){
#s}cK if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
./KXElvQ% hCallWnd[index]=NULL;
e7$ZA#A_5v HotKey[index]=0;
cu@i;Hb@ HotKeyMask[index]=0;
4/Mi-ls_ bRemoved=TRUE;
IAlX^6s* KeyCount--;
2omKP,9,2 break;
AB:JXMyK }
gZg5On }
iC.k8r+~ }
MjNq8'$" return bRemoved;
@[=K`n:n_ }
(v@)nv]U ,$,c<M 9_4bw9A DLL中的钩子函数如下:
2VZdtz JO&~mio LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xh90qm {
>QcIrq%= BOOL bProcessed=FALSE;
Vzmw%f)_+ if(HC_ACTION==nCode)
7<Yf {
L3@upb if((lParam&0xc0000000)==0xc0000000){// 有键松开
%77X/%.Y switch(wParam)
z2
m(<zb {
l_MF9.z& case VK_MENU:
</jzM?i MaskBits&=~ALTBIT;
zZhA]J break;
c97?+Y^ case VK_CONTROL:
Hd8 O3_5 MaskBits&=~CTRLBIT;
eF06B'uL break;
70MSP;^ case VK_SHIFT:
rZi\ MaskBits&=~SHIFTBIT;
rYP72< break;
;UnJrP-if default: //judge the key and send message
j}.,|7X break;
}}Kjb }
P\nz;}nv for(int index=0;index<MAX_KEY;index++){
h;lg^zlTb if(hCallWnd[index]==NULL)
"{@Q..hxC continue;
)
u(Gf*t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5L!cS+QNU {
:ot^bAyt| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!4 =]@eFk bProcessed=TRUE;
pVa9g)+z} }
,SQ`, C
_5 }
Nj^:8]D)0 }
3$yOv"` else if((lParam&0xc000ffff)==1){ //有键按下
w{$X
:Z switch(wParam)
';>A=m9(4% {
Bokpvd-c7 case VK_MENU:
?B5934X MaskBits|=ALTBIT;
<j<V{Wc break;
V:Lq>rs#
case VK_CONTROL:
8=T[Y`;x MaskBits|=CTRLBIT;
#sRkKl| break;
IHs^t/;Iv case VK_SHIFT:
F^/b!)4X MaskBits|=SHIFTBIT;
!Y95e'f.x break;
@L/p default: //judge the key and send message
b rpsZU break;
{pR4+g }
~ 7^#. for(int index=0;index<MAX_KEY;index++){
pFW^ if(hCallWnd[index]==NULL)
! !we4tWq continue;
-H+<81"B# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~0T;T {
tF&g3)D:NV SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%%c1@2G< bProcessed=TRUE;
q[
-YXO }
Jjr&+Q^3Tu }
,'%wadOo }
m,X8Cy|vQ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
KccI Yn~ for(int index=0;index<MAX_KEY;index++){
e,cSB!7 if(hCallWnd[index]==NULL)
4Y/kf%]]A continue;
AW')*{/(Ii if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
= 9K5f#;e SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`v"p""_H //lParam的意义可看MSDN中WM_KEYDOWN部分
5IJm_oy }
*]#(?W.$w }
}Tz<fd/ }
>DSD1i+N return CallNextHookEx( hHook, nCode, wParam, lParam );
d&x #9ka }
5?=haGn a^xt9o` 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:
Gtm|aR{OS %={[e`,
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{n'+P3\T: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z:p;Wm 'lIj89h<E 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:
)&F]j HVLj(_
A LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
9V0@!M8S {
5B)z}g^h if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
3X>x` {
O>tz;RU //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
,"xr^@W SaveBmp();
\|f3\4;! return FALSE;
,l )7]p*X }
(l_/ HQ32 …… //其它处理及默认处理
[zsUboCkc }
dZ6P)R 6Qw5_V^0o VsjE*AJpe 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-zhT?v sn.0`Stt 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。
lq_(au. (M;jnQ0 二、编程步骤
Zjq( ]y SF.Is=b 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";
vP @\" =6Q\78b 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?igA+(. p*5QV 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;
1{Kv Muay6b? 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;
WXmR{za d$}!x[g$Z 5、 添加代码,编译运行程序。
@ i*It Hk pW,)yo4 三、程序代码
7
/7,55 7]F@g}8 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
[yn\O=%5 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
?K!^[aO}= #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
/t|Lu@&:Xo #if _MSC_VER > 1000
{Q~HMe`, #pragma once
c_ Dg0 #endif // _MSC_VER > 1000
,>Yl(=& #ifndef __AFXWIN_H__
4^3lG1^YY #error include 'stdafx.h' before including this file for PCH
Y=$PsDh! #endif
DOB#PI[/ #include "resource.h" // main symbols
uN*Ynf(:- class CHookApp : public CWinApp
<_ruVy0] {
{^*K@c public:
;^f ;< CHookApp();
CB KLct> // Overrides
);!IGcgF // ClassWizard generated virtual function overrides
4Je[!X@C //{{AFX_VIRTUAL(CHookApp)
8_=MP[(H public:
rInZd`\ virtual BOOL InitInstance();
VtYrU>q virtual int ExitInstance();
$i9</Es
P //}}AFX_VIRTUAL
A?+cdbxJw //{{AFX_MSG(CHookApp)
w^Atd|~gi // NOTE - the ClassWizard will add and remove member functions here.
ESyb34T` // DO NOT EDIT what you see in these blocks of generated code !
e$l*s/"0t //}}AFX_MSG
8$~^-_>n/ DECLARE_MESSAGE_MAP()
1a]QNl_x };
UNF@%O4_T LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
DcRvZH BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
WvN{f* BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$,
vXyZ BOOL InitHotkey();
{g7~e{2 BOOL UnInit();
OSY.$$IO #endif
M"s+k :x[SV^fw[ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
ep)O|_= #include "stdafx.h"
H~<w*[uT #include "hook.h"
mhW*rH*m #include <windowsx.h>
}Hy4^2B #ifdef _DEBUG
/*1p|c ^ #define new DEBUG_NEW
#t< #undef THIS_FILE
r0/aw
static char THIS_FILE[] = __FILE__;
}'WEqNuE #endif
9,cMb)=0 #define MAX_KEY 100
n%K^G4k^ #define CTRLBIT 0x04
*&doI%q #define ALTBIT 0x02
rr^?9M*{V #define SHIFTBIT 0x01
_~.S~;o!b #pragma data_seg("shareddata")
]Ei*I} HHOOK hHook =NULL;
<^(>o UINT nHookCount =0;
T8NDS7&? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
aL^
58M y& static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
.r~M7 I static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
xU;/LJ6 static int KeyCount =0;
(Tv~$\= static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
d=eIsP'h #pragma data_seg()
:x3"Cj HINSTANCE hins;
^^T
xx void VerifyWindow();
[9d4 0>e BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
`Rx\wfr} //{{AFX_MSG_MAP(CHookApp)
%V|n2/O
Y // NOTE - the ClassWizard will add and remove mapping macros here.
\\P*w$c // DO NOT EDIT what you see in these blocks of generated code!
cq"#[y$r //}}AFX_MSG_MAP
~s2la~gu END_MESSAGE_MAP()
BFswqp: a\B'Qe+ CHookApp::CHookApp()
8 -YC#& {
!rTkH4!_ // TODO: add construction code here,
ZtGtJV"H // Place all significant initialization in InitInstance
Vb,'VN% }
x(7Q5Uk\ iI Dun Ih CHookApp theApp;
ows3% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xQDWnpFc {
fL~@v-l#~ BOOL bProcessed=FALSE;
r!;wKO if(HC_ACTION==nCode)
V*gh"gZ< {
>4&0j'z"
if((lParam&0xc0000000)==0xc0000000){// Key up
88On{Kk.v switch(wParam)
o&MOcy D {
bKt4 case VK_MENU:
B &e'n< MaskBits&=~ALTBIT;
x7!gmbMfK' break;
c Rv#aV case VK_CONTROL:
y' RQ_Gi MaskBits&=~CTRLBIT;
bD`h/jYv break;
+1nzyD_E case VK_SHIFT:
.oqe0$I MaskBits&=~SHIFTBIT;
l#TE$d^ym break;
0M!GoqaA default: //judge the key and send message
1ZY~qP+n+ break;
`r]C%Y4? }
=Q #d0Q for(int index=0;index<MAX_KEY;index++){
2H/{OQ$ if(hCallWnd[index]==NULL)
mo"1|Q& continue;
elz0t<V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,</Kn~b {
&l0,q=T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
et=i@PB) bProcessed=TRUE;
`(M0I!t }
0i(c XB }
Sq]QRI/ }
-tA_"q'^ else if((lParam&0xc000ffff)==1){ //Key down
Mc{-2 switch(wParam)
*uoO#4g~ {
"KgNMNep case VK_MENU:
;KgDVq5 MaskBits|=ALTBIT;
Sym}#F\s break;
]]P@*4! case VK_CONTROL:
4"veq rC MaskBits|=CTRLBIT;
0ax;Q[z2 break;
?\$6"c<G case VK_SHIFT:
M9Xq0BBu MaskBits|=SHIFTBIT;
Hu+GN3`sx^ break;
$f=6>Kn|^] default: //judge the key and send message
sGx3O i break;
9XhcA }
3_"tds <L for(int index=0;index<MAX_KEY;index++)
o,RiAtdk {
w+$~ds if(hCallWnd[index]==NULL)
W3jwc{lj continue;
c7D{^$L9v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7^<6|>j4 {
3mhjwgP<nn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
i,wZNX bProcessed=TRUE;
" c+$GS }
}#S1!TU }
iN_P25Z<r }
/[!<rhY if(!bProcessed){
QCO,f for(int index=0;index<MAX_KEY;index++){
{E0\mZ2 if(hCallWnd[index]==NULL)
w?Pex]i{ continue;
:!JQ<kV if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
mbns%%GJU SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Tj+U:#!!~ }
4v`G/w }
CSY-{ }
<H$!OPV return CallNextHookEx( hHook, nCode, wParam, lParam );
LtUvFe }
Pn l}<i x[xRqC
vL BOOL InitHotkey()
aYM~Ub:x{ {
R'8S)'l if(hHook!=NULL){
7CH.BY nHookCount++;
Zv(6VVj return TRUE;
Bru] ;%Qg% }
^^F 8M0k3 else
]Y@_ 2` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
jVh:Bw if(hHook!=NULL)
WF:4p]0~) nHookCount++;
_l2_) ~ return (hHook!=NULL);
[^D>xD3B2 }
hkdF BOOL UnInit()
YFDOp* {
eAStpG"* if(nHookCount>1){
.osG"cS nHookCount--;
_-rC]iQJ55 return TRUE;
DF
UTQ:N }
YRMe<upo BOOL unhooked = UnhookWindowsHookEx(hHook);
jib pZ) if(unhooked==TRUE){
&xZSM, nHookCount=0;
`z$P,^g` hHook=NULL;
a l9(
9) }
_%Yi^^ return unhooked;
?#Y:2LqP C }
Xppv Uf
MQ?(, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CM%;/[WBxy {
?J-\}X BOOL bAdded=FALSE;
yL),G*[p\} for(int index=0;index<MAX_KEY;index++){
QN|=/c<U if(hCallWnd[index]==0){
mX!*|$bs hCallWnd[index]=hWnd;
sWB@'P:x HotKey[index]=cKey;
([^#.x)hz HotKeyMask[index]=cMask;
I@\D
tQZ bAdded=TRUE;
w=3
j'y{f KeyCount++;
y0-UO+; break;
}Q@~_3,UJ }
RAnF=1[v }
1;'-$K`} return bAdded;
}h1eB~6M }
bYZU}Kl;( _#MKp H BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
><S(n#EB {
o
0T1pGs' BOOL bRemoved=FALSE;
gf?N(, for(int index=0;index<MAX_KEY;index++){
i+pQ 7wx if(hCallWnd[index]==hWnd){
c&,q`_t if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
A\W)uwyN hCallWnd[index]=NULL;
tCm]1ZgRW HotKey[index]=0;
f/s" 2r HotKeyMask[index]=0;
UR9\g( bRemoved=TRUE;
,7k-LAA KeyCount--;
zG8g}FrzG; break;
NqGSoOjIO2 }
8!HB$vdw7 }
cx ("F/Jm }
h&n1}W+ return bRemoved;
s~bi#U;dF }
~I9o* cq "RM\<)IF void VerifyWindow()
7=5eLc^ {
0igB pHS for(int i=0;i<MAX_KEY;i++){
@rAV;D% if(hCallWnd
!=NULL){ W/b)OlG"2
if(!IsWindow(hCallWnd)){ La3rX
hCallWnd=NULL; k{=dV
HotKey=0; +S[3HX7H
HotKeyMask=0; Z[ &d2'
KeyCount--; 0w0{@\9
} $zU%?[J
} $d!Vx m
} H5 &._
} co1aG,>"q
rZcSG(d`53
BOOL CHookApp::InitInstance() tbiM>qxB
{ mQR9Pn}H
AFX_MANAGE_STATE(AfxGetStaticModuleState()); }S3 oX$
hins=AfxGetInstanceHandle(); F#M(#!)Y"
InitHotkey(); RgL>0s
return CWinApp::InitInstance(); +
d 3
} pT3icy!A=
$45.*>,
int CHookApp::ExitInstance() V0#Ocq,
{ (>f`>6 V
VerifyWindow(); , ,ng]&%i
UnInit(); eV/oY1B]<
return CWinApp::ExitInstance(); Dte5g),R
} HyOrAv
<
UqyW8TCf?
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q mv0 LU
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $COjC!M
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \v5;t9uBZ
#if _MSC_VER > 1000 c#"t.j<E}
#pragma once zH6@v+gb
#endif // _MSC_VER > 1000 2%6 >)|
{7c'%e
class CCaptureDlg : public CDialog #^Pab^Y3r-
{ x#N_h0[i
// Construction ;gSRpTS:
public: y+w,j]
BOOL bTray; {j;` wN
BOOL bRegistered; |2@*?o"ll
BOOL RegisterHotkey(); ; :q
UCHAR cKey; m4m|?
UCHAR cMask; a'/i/@h
void DeleteIcon(); u%+k\/Scp.
void AddIcon(); hjM?D`5x
UINT nCount; Hh*?[-&r~
void SaveBmp(); xE]y*\
CCaptureDlg(CWnd* pParent = NULL); // standard constructor yz=X{p1
// Dialog Data 5oSp/M
//{{AFX_DATA(CCaptureDlg) 7gZ}Qy
enum { IDD = IDD_CAPTURE_DIALOG }; Mqvo
j7
CComboBox m_Key; dFDf/tH
BOOL m_bControl; i}P{{kMJ
BOOL m_bAlt; ;RX u}pd
BOOL m_bShift; Cl9 nmyf
CString m_Path; 3Jlap=]68S
CString m_Number; 4oueLT(zc
//}}AFX_DATA O!{YwE8x9
// ClassWizard generated virtual function overrides V+y"L>K
//{{AFX_VIRTUAL(CCaptureDlg) Up'#OkTx
public: {7@*cBqN
virtual BOOL PreTranslateMessage(MSG* pMsg); s</qT6@
protected: 6h,!;`8O
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M<n'ZDK`W
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {srxc4R`
//}}AFX_VIRTUAL `&7tADFB
// Implementation -fmJkI
protected: 7>BfHb
HICON m_hIcon; w4Df?)Z
// Generated message map functions G$MEVfd"
//{{AFX_MSG(CCaptureDlg) `o295eiY(b
virtual BOOL OnInitDialog(); D\9-/p
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UO@K:n
afx_msg void OnPaint(); VZI!rFac
afx_msg HCURSOR OnQueryDragIcon(); 3B
'j?+A
virtual void OnCancel(); fz :(mZ%
afx_msg void OnAbout(); p^k0Rad
afx_msg void OnBrowse(); )"6-7ii7(f
afx_msg void OnChange(); $HsNV6
//}}AFX_MSG ~'KqiUY
DECLARE_MESSAGE_MAP() 0]iaNR
%
}; #Gg^QJ*
#endif ,NS*`F[O
O^row1D_
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lV%1I@[M
#include "stdafx.h" _W_< bI34
#include "Capture.h" SeDk/}/~e
#include "CaptureDlg.h" ;%^=V#
#include <windowsx.h> ->{-yh]jv
#pragma comment(lib,"hook.lib") U4\v~n\
#ifdef _DEBUG J;8d-R5
#define new DEBUG_NEW nWY^?e'S
#undef THIS_FILE 9g5h~Ma
static char THIS_FILE[] = __FILE__; =
a60Xv
#endif *|dK1'Xr
#define IDM_SHELL WM_USER+1
Pap6JR{7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2a48(~<_
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z9+fTT
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H4AT>}ri
class CAboutDlg : public CDialog ?`rAO#1
{ |oXd4
public: ZDbe]9#Xh
CAboutDlg(); @|c])
// Dialog Data QR'# ]k;>%
//{{AFX_DATA(CAboutDlg) w"s@q$}]8M
enum { IDD = IDD_ABOUTBOX }; FZj>N(
//}}AFX_DATA k-=LD
// ClassWizard generated virtual function overrides aW&)3C2-x
//{{AFX_VIRTUAL(CAboutDlg) p ZTrh&I]
protected: >a<1J(c
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +|,4g_(j
//}}AFX_VIRTUAL I"vkfi#=
// Implementation X]D,kKasG
protected: DI{*E
//{{AFX_MSG(CAboutDlg) ; s/<wx-C
//}}AFX_MSG 4$pV;xV
DECLARE_MESSAGE_MAP() +)"Rv%.
}; U\tx{CsSz
zZ8 *a\
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {XmCG%%L
{ 4F6aPo2
//{{AFX_DATA_INIT(CAboutDlg) tj[E!
//}}AFX_DATA_INIT :1>?:3,`
} ZDW=>}~_y
p|ink):
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Pa{
{ f(Of+>
CDialog::DoDataExchange(pDX); h7UNmwj
//{{AFX_DATA_MAP(CAboutDlg) ~EPVu
//}}AFX_DATA_MAP x~!|F5JbM
} %ERcFI]G
;: 2U}p^-
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1d<Uwb>
//{{AFX_MSG_MAP(CAboutDlg) aY>v
// No message handlers R;c9)>8L
//}}AFX_MSG_MAP kygw}|, N
END_MESSAGE_MAP() g=56|G7n
i#`q<+/q
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LD}~]
: CDialog(CCaptureDlg::IDD, pParent)
-9i7Ja
{ sE6>JaH
//{{AFX_DATA_INIT(CCaptureDlg) *c94'T cl
m_bControl = FALSE; *kl :/#
m_bAlt = FALSE; $}gMJG
m_bShift = FALSE; Km8aHc]O~
m_Path = _T("c:\\"); D![v{0 er
m_Number = _T("0 picture captured."); :]m.&r S,
nCount=0; + '_t)k^
bRegistered=FALSE; LnI
bTray=FALSE; rQVX^
//}}AFX_DATA_INIT k6;bUOo
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 M}V!;o<t^
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Ic0Y
} WQ.0} n}d
1*TbgxS~W
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) WK>|IgK
{ ^Fco'nlM
CDialog::DoDataExchange(pDX); 0- )K_JV
//{{AFX_DATA_MAP(CCaptureDlg) {7OHEArv
DDX_Control(pDX, IDC_KEY, m_Key); %'=*utOxy
DDX_Check(pDX, IDC_CONTROL, m_bControl); zXn-E
DDX_Check(pDX, IDC_ALT, m_bAlt); PC#^L$cg}
DDX_Check(pDX, IDC_SHIFT, m_bShift); #_wq#rF
DDX_Text(pDX, IDC_PATH, m_Path); $ s/E}X
DDX_Text(pDX, IDC_NUMBER, m_Number); >5t%_/yeB
//}}AFX_DATA_MAP 9qB0F_xl
} q*l4h u%3
tg/UtE`V
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) TJO$r6&
//{{AFX_MSG_MAP(CCaptureDlg) %M@K(Qu
ON_WM_SYSCOMMAND() U%nkPIFm
ON_WM_PAINT() l}))vf=i
ON_WM_QUERYDRAGICON() 27e!KG[&
ON_BN_CLICKED(ID_ABOUT, OnAbout) YB5"i9T2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g"evnp
ON_BN_CLICKED(ID_CHANGE, OnChange) _s=H|#l
//}}AFX_MSG_MAP lD/9:@q\V
END_MESSAGE_MAP() J+u}uN@
v _MQ]X
BOOL CCaptureDlg::OnInitDialog() l<`>
{ (90/,@66l
CDialog::OnInitDialog(); _fHml
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lT^su'+bk
ASSERT(IDM_ABOUTBOX < 0xF000); 8s0+6{vW
CMenu* pSysMenu = GetSystemMenu(FALSE); <W"W13*j!
if (pSysMenu != NULL) O,Q.-
{ hJ}i+[~be
CString strAboutMenu; j<B9$8x&
strAboutMenu.LoadString(IDS_ABOUTBOX); vwU1}H
if (!strAboutMenu.IsEmpty()) >.iF,[.[F<
{ f~`=I NrU
pSysMenu->AppendMenu(MF_SEPARATOR); bO=|utpk
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h+FM?ct6}
} -b(DPte
} { qNPhi
SetIcon(m_hIcon, TRUE); // Set big icon m+TAaK
SetIcon(m_hIcon, FALSE); // Set small icon 1UP=(8j/
m_Key.SetCurSel(0); tJ\
$%
RegisterHotkey(); a#YK1n[!
CMenu* pMenu=GetSystemMenu(FALSE); Lnr9*dm6q
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Iux3f+H
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @Jzk2,rI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); K3yQ0k
|
return TRUE; // return TRUE unless you set the focus to a control !GqFX+!Ju
} ,@`?I6nKy
Ttluh
*
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8D='N`cN+
{ Jj"{C]
if ((nID & 0xFFF0) == IDM_ABOUTBOX) {>f"&I<xw
{ nI\6aG?`
CAboutDlg dlgAbout; Y}:~6`-jj
dlgAbout.DoModal(); 9P?0D
} m\L`$=eO8
else b2m={q(s
{ Zse&{
CDialog::OnSysCommand(nID, lParam); $9)os7H7
} }aZuCe_
} >HP
`B2Q
H
b(iF0U>&
void CCaptureDlg::OnPaint() \i%'M%
{ HN7CcE+l
if (IsIconic()) +[7~:e}DZ
{ :GXF=Df
CPaintDC dc(this); // device context for painting vrnvv?HPrR
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _%w680b'
// Center icon in client rectangle j9p6rD
int cxIcon = GetSystemMetrics(SM_CXICON); #De>EQ%
int cyIcon = GetSystemMetrics(SM_CYICON); #,%bW[L<N
CRect rect; `2mddx8
GetClientRect(&rect); p}1i[//S
int x = (rect.Width() - cxIcon + 1) / 2; p['RV
int y = (rect.Height() - cyIcon + 1) / 2; RY , <*
// Draw the icon .H" ?&Mf
dc.DrawIcon(x, y, m_hIcon); AUnfhk@$
} xE/?ncTK^
else 3gA %Q`"
{ 2c `m=
CDialog::OnPaint(); wPlM=
.Hq?
} jm}CrqU
} QJ|@Y(KV0
2HE@!*z9H
HCURSOR CCaptureDlg::OnQueryDragIcon() H+v&4} f
{ &."$kfA+
return (HCURSOR) m_hIcon; sh<Q2X
} IPQRdBQ
a>wCBkD
void CCaptureDlg::OnCancel() Ep7MU&O0iK
{ 6 d-\+t8
if(bTray) 4&iQo'
DeleteIcon(); m2(>KMbi
CDialog::OnCancel(); S,#1^S
} .ZTvOm'mB^
Ez3fL&*
void CCaptureDlg::OnAbout() {w@qFE'b
{ o`bch?]
CAboutDlg dlg; 7EJ2 On
dlg.DoModal(); PTQ#8(_,
} Ds9)e&yYrb
` 2lS@
void CCaptureDlg::OnBrowse() n6/Ous
{ WyN
;lId
CString str; 0dchOUj
BROWSEINFO bi; Z(mUU]
char name[MAX_PATH]; >Bt82ibN
ZeroMemory(&bi,sizeof(BROWSEINFO)); XkaREE
bi.hwndOwner=GetSafeHwnd(); 1[FN: hm
bi.pszDisplayName=name; 5^B79A"}
bi.lpszTitle="Select folder"; nV'1 $L#
bi.ulFlags=BIF_RETURNONLYFSDIRS; V=O52?8
LPITEMIDLIST idl=SHBrowseForFolder(&bi); spEdq}
if(idl==NULL) e;]tO-Nu
return; =rjU=3!&(
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "#Rh\DQ
str.ReleaseBuffer(); %w;qu1j
m_Path=str; &V].,12x
if(str.GetAt(str.GetLength()-1)!='\\') yW_yHSx;
m_Path+="\\"; $J[( 3
UpdateData(FALSE); iC"iR\Qu
} vsY?q8+P
WtT;y|W
void CCaptureDlg::SaveBmp() 8=8hbdy;
{ lx)^wAO4
CDC dc; @DN/]P
dc.CreateDC("DISPLAY",NULL,NULL,NULL); q+ax]=w
CBitmap bm; :U6`n
int Width=GetSystemMetrics(SM_CXSCREEN); e4z`:%vy
int Height=GetSystemMetrics(SM_CYSCREEN); Q6h+.
bm.CreateCompatibleBitmap(&dc,Width,Height); PL/g| ;
CDC tdc; -F 5BJk
tdc.CreateCompatibleDC(&dc); honh'j
CBitmap*pOld=tdc.SelectObject(&bm); $0])%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6u[fCGi%
tdc.SelectObject(pOld); Rh>B#
\
BITMAP btm; $7x2TiAL
bm.GetBitmap(&btm); s8h*nZ)v
DWORD size=btm.bmWidthBytes*btm.bmHeight; <b 5DX
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Aoe\\'O|V
BITMAPINFOHEADER bih; 8z=#
0+0
bih.biBitCount=btm.bmBitsPixel; tsXKhS;/w
bih.biClrImportant=0; ^Q/*on;A,/
bih.biClrUsed=0; f ULt4
bih.biCompression=0; #<{v~sVp&
bih.biHeight=btm.bmHeight; 2t= =<x
bih.biPlanes=1; X\^nV
bih.biSize=sizeof(BITMAPINFOHEADER); @N*|w
Kc+
bih.biSizeImage=size; dlu*s(O"
bih.biWidth=btm.bmWidth; A5<t> 6Y
bih.biXPelsPerMeter=0; ,9&cIUH
bih.biYPelsPerMeter=0; 9&+]YYCS-
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Jf YgZ\#
static int filecount=0; K;F1'5+=D
CString name;
a_?sJ
name.Format("pict%04d.bmp",filecount++); /%@;t@BK4
name=m_Path+name; Qqm?%7A1
BITMAPFILEHEADER bfh; 5EYGA\
bfh.bfReserved1=bfh.bfReserved2=0; *+M#D^qo
bfh.bfType=((WORD)('M'<< 8)|'B'); {j2V k)\[i
bfh.bfSize=54+size; mLCDN1UO{
bfh.bfOffBits=54; }b_Ob
CFile bf; #QNN;&L]R
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ AA\a#\#Z3
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'l*X?ccKy
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H& |/|\8F
bf.WriteHuge(lpData,size); \ .xS
bf.Close(); v~$V
nCount++; wQxI({k@
} 1@]&iZ]
GlobalFreePtr(lpData); c1YDln
if(nCount==1) '$ei3
m_Number.Format("%d picture captured.",nCount); YxF@1_g
else sd%j&Su#4
m_Number.Format("%d pictures captured.",nCount); (7 I|lf
e
UpdateData(FALSE); xSY"Ru
} 0 R6:3fV6R
?sN{U\
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DDE-$)lf>
{ %>+uEjbT
if(pMsg -> message == WM_KEYDOWN) zPt<b!q
{ b3A0o*
if(pMsg -> wParam == VK_ESCAPE) R1];P*>%gZ
return TRUE; BT7{]2?&V
if(pMsg -> wParam == VK_RETURN) gInh+XZs
return TRUE; *EWWN?d
} "\|P6H
return CDialog::PreTranslateMessage(pMsg); <4}m:
} Exb64n-_=
R%UTYRLUn
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0jTReY-W
{ O}M-6!%<,
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +,e#uuj$p
SaveBmp(); 4@9Pd &I
return FALSE; +x]/W|5
} t3<MoDe7`r
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sz9W}&(j
CMenu pop; bzr2Zj{4
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]$smFF
CMenu*pMenu=pop.GetSubMenu(0); 'ZbWr*bo
pMenu->SetDefaultItem(ID_EXITICON); *HoRYCL
CPoint pt; t2[/eM.G
GetCursorPos(&pt); \VpEUU6^U
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gAAC>{Wh
if(id==ID_EXITICON) -S$F\%
DeleteIcon(); 4H{t6t@-:
else if(id==ID_EXIT) 7^dr[.Q[*
OnCancel(); tZ_'>7)
return FALSE; ale'-V)5
} Fp\;j\pfw
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #Oka7.yz
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) VN`.*B|9[
AddIcon(); 2KLMFI.F
return res; ibkB>n{(
} @KQ>DBWQM
EI_-5Tt RD
void CCaptureDlg::AddIcon() 1 Pk+zBJ$
{ ~P3b5 -
NOTIFYICONDATA data; A`7(i'i5]
data.cbSize=sizeof(NOTIFYICONDATA); hRf
l\Q[
CString tip; 8$IKQNS
tip.LoadString(IDS_ICONTIP); eF+F"|1h
data.hIcon=GetIcon(0); 64B.7S88
data.hWnd=GetSafeHwnd(); s~M$Wo8
strcpy(data.szTip,tip); x^ `/&+m
data.uCallbackMessage=IDM_SHELL; VYG@_fd!x
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <6UXk[y
data.uID=98; PUR,r%K`
Shell_NotifyIcon(NIM_ADD,&data); 63l3WvoK
ShowWindow(SW_HIDE); NLy4Z:&{
bTray=TRUE; }UPC~kC+Z
} t^01@ejM+
3](hMk,}
void CCaptureDlg::DeleteIcon() /.]u%;%r[
{
2%@tnk|@
NOTIFYICONDATA data; &5W;E+Pub
data.cbSize=sizeof(NOTIFYICONDATA); T}fo
data.hWnd=GetSafeHwnd(); &gCGc?/R#
data.uID=98; y3~`qq
Shell_NotifyIcon(NIM_DELETE,&data); f@i#Znkf*?
ShowWindow(SW_SHOW); n0KpKH<&
SetForegroundWindow(); qPDNDkjDD
ShowWindow(SW_SHOWNORMAL); Xb"i/gfxt
bTray=FALSE; eoiz]L
} 5,Fq:j)MxW
Skr(C5T
void CCaptureDlg::OnChange() (L(7)WbH
{ OxHcoNrz
RegisterHotkey(); nM[yBA
} I=!kPuw
@2E52$zu
BOOL CCaptureDlg::RegisterHotkey() ?I+{S
{ hF'VqJS
UpdateData(); u@Hz7Q}
P
UCHAR mask=0; 5}%R
UCHAR key=0; 5zK,(cF0-
if(m_bControl) 6kAAdy}ck
mask|=4; . 1kB8&}
if(m_bAlt) OBWb0t5H?
mask|=2; 'I,a 29
if(m_bShift) +La2-I
mask|=1; ,`f]mv l
key=Key_Table[m_Key.GetCurSel()]; in>+D|q
c
if(bRegistered){ ,
>7PG2
a
DeleteHotkey(GetSafeHwnd(),cKey,cMask); L3b0e_8>R
bRegistered=FALSE; (OiV IH
} }u8(7
cMask=mask; uWJJ\
cKey=key; [/a
AH<9b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TtkHMPlm_
return bRegistered; kL DpZ{
} d88A.Z3w
9~hW8{#
四、小结 8&JB_%Gb
y i$+rPF1
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。