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:
N8(xz-6
xdp!'1n."g 一、实现方法
c38RE,4U }Q_IqI[7 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:
B1m@ \~:Kp
Kq #pragma data_seg("shareddata")
3:jKuOX HHOOK hHook =NULL; //钩子句柄
A<^IG+Q,B7 UINT nHookCount =0; //挂接的程序数目
Acr\2!)) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
dA>t static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
e:{v.C0ez static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
.$)'7 static int KeyCount =0;
#C,M8~Q7 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
4xhV
+Y #pragma data_seg()
)hj77~{+ 2D`@$)KL 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。
#*q`/O5n P,!si# 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:
I9N?zmH =Z_\8qc BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
L~A"%T,/h cKey,UCHAR cMask)
T[>h6d {
])}{GW BOOL bAdded=FALSE;
9'3%%o for(int index=0;index<MAX_KEY;index++){
w[\*\'Vm0 if(hCallWnd[index]==0){
wl^bvHG hCallWnd[index]=hWnd;
4XK*sR0-` HotKey[index]=cKey;
Cl[ '6Lk HotKeyMask[index]=cMask;
o!L1Qrh bAdded=TRUE;
`;WiTE)&) KeyCount++;
Z `O.JE break;
/%}+FMj }
3B/ GcltfM }
QE}S5#_" return bAdded;
/,$;xt-J35 }
gbwKT`N* //删除热键
DbJ:KQ!* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S%uH*&` {
%1SA!1>j BOOL bRemoved=FALSE;
G40,KCa for(int index=0;index<MAX_KEY;index++){
0F=UZf& if(hCallWnd[index]==hWnd){
Tn2Z{.q$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
l_iucN hCallWnd[index]=NULL;
#)q}Jw4]j HotKey[index]=0;
w{)*'8oCB HotKeyMask[index]=0;
f 7{E(, bRemoved=TRUE;
,0NVb7F;k KeyCount--;
rZ 9bz}K break;
Fwyv>U }
^Tc&?\3 }
6kGIO$xJ) }
5+rYk|*D+k return bRemoved;
5tHv'@ }
OP]=MZP| fJLlz$H -(~Tu>KaH DLL中的钩子函数如下:
&+6XdhX QKc3Q5)@j LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
6=A2Y:8 {
}M?GqA= BOOL bProcessed=FALSE;
sY7:Lzs., if(HC_ACTION==nCode)
ma@ws,H {
QR2J;Oj_ if((lParam&0xc0000000)==0xc0000000){// 有键松开
" jn@S- switch(wParam)
m'Z233Nt" {
^tsIgK^9H case VK_MENU:
)`F?{Sg MaskBits&=~ALTBIT;
#Bj{
4OeV break;
LdR}v%EH case VK_CONTROL:
*ntq;] MaskBits&=~CTRLBIT;
4Cke(G break;
-'BJhi\Y]~ case VK_SHIFT:
-en:81a# MaskBits&=~SHIFTBIT;
J)A1`(x&T break;
g2;JJ} default: //judge the key and send message
mA(K`"Bfh break;
tf|/_Y2 }
#!rng]p for(int index=0;index<MAX_KEY;index++){
8U0y86q>)E if(hCallWnd[index]==NULL)
iU9de continue;
OgyETSN8C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
d?WA}VFU {
dMw7Lp& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`B) ~ bProcessed=TRUE;
XD{U5.z>y }
1""9+4 }
!tCw)cou }
6xr$ else if((lParam&0xc000ffff)==1){ //有键按下
%/~6Qq switch(wParam)
Et(Q$/W {
-q&VV, case VK_MENU:
6AqHzeh MaskBits|=ALTBIT;
[|d:QFx break;
'?E^\\"* case VK_CONTROL:
PP/M-Jql) MaskBits|=CTRLBIT;
T=:O(R1*0 break;
V;L^q?v
! case VK_SHIFT:
!~04^( MaskBits|=SHIFTBIT;
p&B98c break;
&zlwV"W default: //judge the key and send message
UA>~xJp= break;
6/hY[a! }
i&-g 0
for(int index=0;index<MAX_KEY;index++){
n*CH,fih: if(hCallWnd[index]==NULL)
ylLQKdcL continue;
8/U=~*`_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'I($IM {
R3d>|`) + SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
yX$I<L<Suz bProcessed=TRUE;
%CfJ.;BDNE }
7]d396% }
Tc,Bv7: }
djS?$WBpU if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
( u@[}! for(int index=0;index<MAX_KEY;index++){
Fo3[KW)8I if(hCallWnd[index]==NULL)
.UakO,"z continue;
\U4O*lq if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
<>A:Oi3^ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
N)lzX X //lParam的意义可看MSDN中WM_KEYDOWN部分
jRm:9`.Q }
-. L)-%wIV }
Jn +[:s. }
7e/Uc!&* return CallNextHookEx( hHook, nCode, wParam, lParam );
>J[g)$, }
NO P~?p 4
`Z @^W 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
}$hxD9z K0@2>nR BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5UVQ48aT BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
p \; * : k.rP}76 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:
H?sl_3-# ta> g: LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
K%Mm'$fTw {
)@ZJ3l. if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Nb>|9nu
O {
:&mYz(1q //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
@X>k@M SaveBmp();
[y\ZnoB return FALSE;
5`{ +y] }
Cc0`Y lx~( …… //其它处理及默认处理
VQZ3&]o }
DIB Az s r42[pi]F 5@tpJ8E8$ 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。
F@kOj*5,[ Ms<^_\iPN 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。
q]0a8[]3 n!|K# 二、编程步骤
>MUwT$szs Y$--Hp4 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";
i)1E[jc{p! s24-X1d(9 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
5>t&)g q =b.!AZy 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;
b\7-u- V,<,;d fR 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;
^LfCLI9Z -DlKFN 5、 添加代码,编译运行程序。
"z69jxXo =jkC]0qx
三、程序代码
%/oOM\}++ ":"QsS#*"# ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
vPR1
TMi> #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
nUQcoSY# #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
X9/V;! #if _MSC_VER > 1000
Z9i,#/ #pragma once
-fj;9('YJ #endif // _MSC_VER > 1000
V3$!`T}g4 #ifndef __AFXWIN_H__
0Q;T
<%U #error include 'stdafx.h' before including this file for PCH
@@*-> #endif
:u'X
~ID[ #include "resource.h" // main symbols
(i|`PA class CHookApp : public CWinApp
gu/eC {
t+qLQY}= public:
C N"Vw CHookApp();
}Tu_?b`RUm // Overrides
k)[} 3oq // ClassWizard generated virtual function overrides
s Ce7ni //{{AFX_VIRTUAL(CHookApp)
8doT`rI1 public:
*<x]gV virtual BOOL InitInstance();
8q)2)p virtual int ExitInstance();
RoxzCFsI\ //}}AFX_VIRTUAL
e[ i&2mM //{{AFX_MSG(CHookApp)
9u1_L`+b // NOTE - the ClassWizard will add and remove member functions here.
xii*"n ~ // DO NOT EDIT what you see in these blocks of generated code !
J,;;`sf //}}AFX_MSG
&&ecq DECLARE_MESSAGE_MAP()
$P^=QN5Bb };
j~\\,fl= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
v%/8pmZw; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
$B~a*zZ7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{Xwin$C BOOL InitHotkey();
XZV)4=5iSO BOOL UnInit();
IQGIU3O #endif
r;y&Wa k5w+{iOh //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
KFAB #include "stdafx.h"
;)83tx
/ #include "hook.h"
ZA2y #include <windowsx.h>
n j;
KnZ #ifdef _DEBUG
8ji!FZf #define new DEBUG_NEW
D@[$?^H #undef THIS_FILE
>7vSN<w~m static char THIS_FILE[] = __FILE__;
9`{Mq9J #endif
=WyAOgy} #define MAX_KEY 100
qI<*Cze #define CTRLBIT 0x04
bTA<AoW9=" #define ALTBIT 0x02
T >g1!
-^ #define SHIFTBIT 0x01
MG8-1M #pragma data_seg("shareddata")
I}n"6'* HHOOK hHook =NULL;
[mw#a9 UINT nHookCount =0;
Vn];vN static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
++R-_oQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Kl(}s{YFn. static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
6C
r$R]5 static int KeyCount =0;
vIN6W static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
3`^]#Dh #pragma data_seg()
LMsbTF@E HINSTANCE hins;
-|J?- void VerifyWindow();
}9Y='+.%^ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
-/#3U{O //{{AFX_MSG_MAP(CHookApp)
FE M_7M // NOTE - the ClassWizard will add and remove mapping macros here.
1?7QS\`)fB // DO NOT EDIT what you see in these blocks of generated code!
?Z1pPd@ //}}AFX_MSG_MAP
_[0Ugfz( END_MESSAGE_MAP()
ynZ! 5Tn4iyg;B CHookApp::CHookApp()
j|lg&kN {
tHJ1MDw' // TODO: add construction code here,
YV!!bI // Place all significant initialization in InitInstance
@VxBURZ? }
G|3OB: o }Tv^>L CHookApp theApp;
_AVCh)Zb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
XKks j!'B {
E+E5`-V BOOL bProcessed=FALSE;
5wGyM10 if(HC_ACTION==nCode)
Kh$L~4l {
(O?z6g if((lParam&0xc0000000)==0xc0000000){// Key up
^$?8!WE switch(wParam)
tG%R_$* {
7yQ r case VK_MENU:
`kekc.*-[@ MaskBits&=~ALTBIT;
(&njZdcb* break;
N|[a<ut< case VK_CONTROL:
n>#h( MaskBits&=~CTRLBIT;
_r^&.'q break;
fC~WuG3 case VK_SHIFT:
+XY}- MaskBits&=~SHIFTBIT;
YRC`2)_'
break;
N3x}YHFF default: //judge the key and send message
3`, m=1[) break;
f oL`{fA }
vP,WV9Q1u for(int index=0;index<MAX_KEY;index++){
q!O~* if(hCallWnd[index]==NULL)
\[,7# continue;
rbP.N
?YU% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g2iSc {
gO$!_!@LM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
OW #pBeX99 bProcessed=TRUE;
@]2cL }
8,['q~z }
_a.Q@A4' }
#p_ ~L4iW else if((lParam&0xc000ffff)==1){ //Key down
i uN8gHx switch(wParam)
08.dV<P {
d6M
d~$R case VK_MENU:
'i`;Frmg MaskBits|=ALTBIT;
y<;#*wB break;
{ifYr(|p` case VK_CONTROL:
l@Ml8+ MaskBits|=CTRLBIT;
<m )@~s?D break;
:!r_dmJ case VK_SHIFT:
PDGh\Y[AK, MaskBits|=SHIFTBIT;
[9>1e break;
-MOf[f^ default: //judge the key and send message
,u\M7,a^ break;
K-#Rm%J+Wy }
.WtaU for(int index=0;index<MAX_KEY;index++)
&}P62& {
RS$:]hxd>_ if(hCallWnd[index]==NULL)
^KlMBKWyB continue;
wk-ziw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
e|{6^g<ru {
7v=Nh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
{ >4exyu6 bProcessed=TRUE;
pX2 Ki^)] }
5HJ6[.HO }
-4V1s;QUZ }
UUA7m$F1 if(!bProcessed){
? ZN8Ku for(int index=0;index<MAX_KEY;index++){
B04Br~hel* if(hCallWnd[index]==NULL)
5[;p<GqGN continue;
?)JW}3<. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
4}=]QQoE SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kOkgsQQ }
%,)[%>#{ }
~+4OG 0 }
Eb#0-I return CallNextHookEx( hHook, nCode, wParam, lParam );
\:O5, wf2 }
3+(Fq5I 9C`Fd S BOOL InitHotkey()
JQ0KXS Nr {
*<BasP if(hHook!=NULL){
tn:9 nHookCount++;
B_@>HZ\& return TRUE;
J *^|ojX }
}Z%*gfp else
[}+
MZ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
("IRv>} 0 if(hHook!=NULL)
L2Mcs nHookCount++;
R$cg\DD return (hHook!=NULL);
Cee?%NaTS }
<A!v'Y BOOL UnInit()
8l)^#"ySA {
kOJs;k if(nHookCount>1){
m"jqHGFV nHookCount--;
6%O" return TRUE;
2<|+h=
& }
']4sx_)S BOOL unhooked = UnhookWindowsHookEx(hHook);
"r.pU(uxt if(unhooked==TRUE){
&OWiA;e?f nHookCount=0;
1*(^<x+n hHook=NULL;
$t[`}I
} }
.4.zy]I return unhooked;
=>/aM7] }
|67<h5Q1 2hu;N BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zFwp$K>{QY {
EPdR-dC^wE BOOL bAdded=FALSE;
:`oYD for(int index=0;index<MAX_KEY;index++){
\
$z.x-U if(hCallWnd[index]==0){
kS3wa3bT hCallWnd[index]=hWnd;
Bd)Qz(>rw HotKey[index]=cKey;
S}ZM;M HotKeyMask[index]=cMask;
b pExYyt bAdded=TRUE;
c7P"1 KeyCount++;
Hg]Q.SeJ( break;
k}Ahvlq) }
9LzQp`In }
n%W~+ return bAdded;
}.MJVB3 }
M}3>5*!= 'Pr(7^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)!){4c/ {
V+cHL BOOL bRemoved=FALSE;
~vBmW_j for(int index=0;index<MAX_KEY;index++){
B,,f$h! if(hCallWnd[index]==hWnd){
h#'(UZ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Kh'/Ne? hCallWnd[index]=NULL;
.B_)w:oF HotKey[index]=0;
r9z/hm}E HotKeyMask[index]=0;
0KU,M+_ bRemoved=TRUE;
Gb~*[ KeyCount--;
\oLRNr[F break;
lMF j"x\ }
T6%*t#8r }
xSug- }
,8cw jS2E return bRemoved;
lrU}_` }
ID E3>D 0:Yz'k5 void VerifyWindow()
Xc"S"a^\% {
K{t7_i#tv for(int i=0;i<MAX_KEY;i++){
TOeJnk if(hCallWnd
!=NULL){ l7
j3;Ly
if(!IsWindow(hCallWnd)){ KYu3dC'/,&
hCallWnd=NULL; N9Y,%lQ|B8
HotKey=0; tB8XnO_c
HotKeyMask=0; Fpzps!(;=
KeyCount--; `.>2h}op
} n$F&gx'^
} |j#x}8[(
} 6Z\[{S];
} @;"HslU\Q
2_
<
BOOL CHookApp::InitInstance() /E@LnKe
{ v@&&5J|
AFX_MANAGE_STATE(AfxGetStaticModuleState()); qXn%c"
hins=AfxGetInstanceHandle(); zQV$!%qR
InitHotkey(); 3^xTZ*G
return CWinApp::InitInstance(); ICTl{|i ]
} IwiR2K
APsd^J
int CHookApp::ExitInstance() .fk!~8b[Q+
{ &D\~-fOGb
VerifyWindow(); S6*3."Sk
UnInit(); w[qWr@
return CWinApp::ExitInstance(); J'sVT{@GS
} XwOj`N{!H
KcF2}+iM
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7N+No.vR.
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) SuMK=^>%
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^PMP2\JQA
#if _MSC_VER > 1000 Jk!}z+X'A
#pragma once WJ9Jj69
#endif // _MSC_VER > 1000 O~.A}
-\:pbR
class CCaptureDlg : public CDialog %u-l6<w#R
{ Mf^ ;('~
// Construction 4Cr|]o'
public: iEux`CcJ.
BOOL bTray; $cHA_$ `
BOOL bRegistered; m2AA:u_*j
BOOL RegisterHotkey(); X!2/cgU7
UCHAR cKey; zHw[`"[
UCHAR cMask; k%?wNk>
void DeleteIcon(); d nWh}!
void AddIcon(); &]iX>m.
UINT nCount; [~,~ e
void SaveBmp(); ):E4qlB
CCaptureDlg(CWnd* pParent = NULL); // standard constructor / Li?;H
// Dialog Data *`YR-+0
//{{AFX_DATA(CCaptureDlg) ,kfUlv=
enum { IDD = IDD_CAPTURE_DIALOG }; P^#<h"Ht
CComboBox m_Key; "15mOW(!+
BOOL m_bControl; @5K/z<p%
BOOL m_bAlt; 5K|1Y#X
BOOL m_bShift; H.qp~-n
CString m_Path; a938l^@;s8
CString m_Number; T52A}vf4
//}}AFX_DATA QXqBb$AXi,
// ClassWizard generated virtual function overrides +FRXTku(
//{{AFX_VIRTUAL(CCaptureDlg) nKC$
KC
public: yxh8sAZ
virtual BOOL PreTranslateMessage(MSG* pMsg); TXD\i Dq
protected: Z6\OkD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 02q]^3
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D'2&'7-sm\
//}}AFX_VIRTUAL s|.V:%9e
// Implementation q|0Lu
protected: Eqj&SA
HICON m_hIcon; @JVax -N
// Generated message map functions ZNNgi@6>
//{{AFX_MSG(CCaptureDlg) N
'2Nv
virtual BOOL OnInitDialog(); ig3HPlC
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Vi[* a
afx_msg void OnPaint(); i9+(gX(t
afx_msg HCURSOR OnQueryDragIcon(); #G%[4.$n.
virtual void OnCancel(); p "EQ6_f
afx_msg void OnAbout(); '+LC.l M
afx_msg void OnBrowse(); 9#L0Q%,*
afx_msg void OnChange(); @eu4W^W
//}}AFX_MSG me"}1REa
DECLARE_MESSAGE_MAP() Cg^=&1|
};
$x# 0m
#endif t$m~O?I
0+p
<Jc!
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `Nmw
#include "stdafx.h" H5j6$y|I|N
#include "Capture.h" E
Mq P
#include "CaptureDlg.h" b"n0Yk1
#include <windowsx.h> H`|8x4
#pragma comment(lib,"hook.lib") kBg,U 8|S
#ifdef _DEBUG pLi_)(#z_
#define new DEBUG_NEW #e:cB' f
#undef THIS_FILE b:VCr ^vp
static char THIS_FILE[] = __FILE__; KfD=3h=
#endif 9bd $mp
#define IDM_SHELL WM_USER+1 'r3yFoP}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y@N-q
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sw
A^oU
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jz ;N&62|
class CAboutDlg : public CDialog 1{{z[w#
{ ZqH.$nXP
public: f*U3s N^y
CAboutDlg(); %>u(UmFO
// Dialog Data o|FjNL
//{{AFX_DATA(CAboutDlg) 3BHPD;U
enum { IDD = IDD_ABOUTBOX }; 5'=\$Ob
//}}AFX_DATA =E?kxf[X
// ClassWizard generated virtual function overrides ~~,] b
//{{AFX_VIRTUAL(CAboutDlg) ^ z!g3
protected: D>neY9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c&4EO|
//}}AFX_VIRTUAL C],"va
// Implementation =Ji+GJ<,9
protected: ! f!/~M"!
//{{AFX_MSG(CAboutDlg) 3fA.DK[4[
//}}AFX_MSG `F-<P%k
DECLARE_MESSAGE_MAP() eW%Cef
}; J?9K|4
)
mAO$gHQ
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5DB4 vh
{ &/)2P#u
//{{AFX_DATA_INIT(CAboutDlg) >G`Uc&=
//}}AFX_DATA_INIT ZYf0FC=-
} Mkc
rD^ b{]E3
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R]L$Ld< ij
{ =
cQK^$6(
CDialog::DoDataExchange(pDX); uW4)DT9[5
//{{AFX_DATA_MAP(CAboutDlg) ,i0Dw"/u
//}}AFX_DATA_MAP PX!$w*q
} gt]k#(S
ZbBz@1O
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SLI(;, s
//{{AFX_MSG_MAP(CAboutDlg) /Mq9~oC
// No message handlers }.`no
//}}AFX_MSG_MAP rLP:kP'b
END_MESSAGE_MAP() WTWONO>
b2rlj6d
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?fv5KdD
: CDialog(CCaptureDlg::IDD, pParent) VS.~gHx
{ C1/qiSHsh
//{{AFX_DATA_INIT(CCaptureDlg) %0-fn'
m_bControl = FALSE; \m Gx-g6
m_bAlt = FALSE; :'hc&wk`
m_bShift = FALSE; 7I\qEr57
m_Path = _T("c:\\"); {nQ?+o3
m_Number = _T("0 picture captured."); 5pC+*n.
nCount=0; zoh%^8?o
bRegistered=FALSE; w~+C.4=7
bTray=FALSE; mV~aZM0'
//}}AFX_DATA_INIT } J_"/bB
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4th*=ku
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >aw`kr
} 'c]Fhe fb
Ddu1>"p-x
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F"|OcKAA}h
{ 0[\sz>@
CDialog::DoDataExchange(pDX); >]/RlW[
//{{AFX_DATA_MAP(CCaptureDlg) w^BF.Nu
DDX_Control(pDX, IDC_KEY, m_Key); ML:Zm~A1U
DDX_Check(pDX, IDC_CONTROL, m_bControl); $G UCVxs
DDX_Check(pDX, IDC_ALT, m_bAlt); +)J;4B
DDX_Check(pDX, IDC_SHIFT, m_bShift);
19#s:nt9
DDX_Text(pDX, IDC_PATH, m_Path); 1:Sq?=&
DDX_Text(pDX, IDC_NUMBER, m_Number); Dt#( fuk#
//}}AFX_DATA_MAP *P:!lO\|
}
EU5^"\
4fR}+[~2
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5)@UpcjUA
//{{AFX_MSG_MAP(CCaptureDlg) #3~ #`&
ON_WM_SYSCOMMAND()
:r+BL@9
ON_WM_PAINT() o54/r#~fi
ON_WM_QUERYDRAGICON() Yee%
<<S
ON_BN_CLICKED(ID_ABOUT, OnAbout) )c6t`SBwi
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @XJzM]*w&
ON_BN_CLICKED(ID_CHANGE, OnChange) 0pfgE=9
//}}AFX_MSG_MAP z*oeho
END_MESSAGE_MAP() Xh5&J9pw
EOj.Jrs~
BOOL CCaptureDlg::OnInitDialog() v.Vdjs
{ )G+D6s23
CDialog::OnInitDialog(); dQ.:xu}~
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (=\))t8J
ASSERT(IDM_ABOUTBOX < 0xF000); ;L`NF"
CMenu* pSysMenu = GetSystemMenu(FALSE); GZq~Pl
if (pSysMenu != NULL) -f&m4J} E
{ r*F^8_YMK
CString strAboutMenu; /s~(? =qYH
strAboutMenu.LoadString(IDS_ABOUTBOX); uUIjntSF(
if (!strAboutMenu.IsEmpty()) Jn\@wF9xd
{ vB?(|
pSysMenu->AppendMenu(MF_SEPARATOR); .EfGL_
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (ah^</
} y$,j'B:;4m
} -J&
b~t@
SetIcon(m_hIcon, TRUE); // Set big icon W Te1E, M
SetIcon(m_hIcon, FALSE); // Set small icon lj US-6
m_Key.SetCurSel(0); \D5_g8m:
RegisterHotkey(); F?c:
).g
CMenu* pMenu=GetSystemMenu(FALSE); xoB "hNIX
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); w3>.d(Q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [G<SAWFg7
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FgnS+c3W(
return TRUE; // return TRUE unless you set the focus to a control F2^qf
} (~Hwq:=.
KvvG
H-]
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (?vKe5
{ hfL8]d-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Qd"R@+i
{ ^ZD0rp(l
CAboutDlg dlgAbout; 3?x}48
dlgAbout.DoModal(); $5r1Si)
} p!o+8Xz5
else !h.bD/?K
{ CBu$8]9=
CDialog::OnSysCommand(nID, lParam); ba"_!D1
} H1or,>GoO
} +ab#2~,)
4|INy=<"t
void CCaptureDlg::OnPaint() gk^`-`P
{ 3d;w\#?L;
if (IsIconic()) /4Sul*{hc
{ 08W^
CPaintDC dc(this); // device context for painting 5uAUi=XA>S
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^@-qnU lH
// Center icon in client rectangle Y-
tK
int cxIcon = GetSystemMetrics(SM_CXICON); 0ZJN<AzbA
int cyIcon = GetSystemMetrics(SM_CYICON); V }wh
CRect rect; p9Y`_g`
GetClientRect(&rect); `]$H\gNI[8
int x = (rect.Width() - cxIcon + 1) / 2; ,AuejMd
int y = (rect.Height() - cyIcon + 1) / 2; /8[T2Z!
// Draw the icon xN>+!&3%w
dc.DrawIcon(x, y, m_hIcon); |Qz"Z<sNYw
} ~|R/w%*C
else |QO)xEn~
{ r34 GO1d
CDialog::OnPaint(); J]gtgt^
} ZK?:w^Z
} ,/Yo1@U
)%Lgo${[;
HCURSOR CCaptureDlg::OnQueryDragIcon() HI!bq%TZ4
{ dx)v`.%V
return (HCURSOR) m_hIcon;
3F\UEpQ
} w@ $_2t
x)prI6YMv\
void CCaptureDlg::OnCancel() tK LAA+Z
{ 'U{6LSaCb
if(bTray) `\Hs{t]
DeleteIcon(); x-Fl|kwX.5
CDialog::OnCancel(); QV*W#K\7q
} qy,X#y'FuE
VK/i5yT5N
void CCaptureDlg::OnAbout() Y^ti;:
{ -FW'i10\2+
CAboutDlg dlg; />[~2d
kb
dlg.DoModal(); jKhj 7dR
} 3=Va0}#&
7p+uHm
void CCaptureDlg::OnBrowse() 5imqZw
{ ghVxcK
CString str; aj6{
BROWSEINFO bi; od`:w[2\
char name[MAX_PATH]; :}[[G2|9
ZeroMemory(&bi,sizeof(BROWSEINFO)); TM$Ek^fQ.
bi.hwndOwner=GetSafeHwnd(); mqv!"rk'w
bi.pszDisplayName=name; F/chE c
V
bi.lpszTitle="Select folder"; QP[`*X
bi.ulFlags=BIF_RETURNONLYFSDIRS; DOGg=`XK1
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]qNPOnlp
if(idl==NULL) F<^93a9
return; %
ovk}}%;
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h|
]BA}D
str.ReleaseBuffer(); Jm{~H%
m_Path=str; K$Yc!4M
if(str.GetAt(str.GetLength()-1)!='\\') &xjeZh4-
m_Path+="\\"; u9^R
?y
UpdateData(FALSE); _.ELN/$-
} G8ksm2 }
wA>bL PTw
void CCaptureDlg::SaveBmp() a FrVP
{ xrky5[XoD
CDC dc; 2z=GKV
dc.CreateDC("DISPLAY",NULL,NULL,NULL); zFk@Y
CBitmap bm; hR3Pa'/i
int Width=GetSystemMetrics(SM_CXSCREEN); "K*+8IO2
int Height=GetSystemMetrics(SM_CYSCREEN); WX9pJ9d
bm.CreateCompatibleBitmap(&dc,Width,Height); ^_^rI+cTX1
CDC tdc; "yV)&4)
tdc.CreateCompatibleDC(&dc); $N`uM
CBitmap*pOld=tdc.SelectObject(&bm); ?FRQ!R
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); OJ\rT.{
tdc.SelectObject(pOld); TAn.5
wH9t
BITMAP btm; w=H4#a?fc
bm.GetBitmap(&btm); dk9nhS+faJ
DWORD size=btm.bmWidthBytes*btm.bmHeight; Ch9A6?=Hj8
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q{t"=@lX01
BITMAPINFOHEADER bih; #pz{,
bih.biBitCount=btm.bmBitsPixel; ofA6EmQ37
bih.biClrImportant=0; r]vD]
bih.biClrUsed=0; &5u[q
bih.biCompression=0; m%?b"kxL[
bih.biHeight=btm.bmHeight; |Zo_x}0
bih.biPlanes=1; R(sa.Q\D4
bih.biSize=sizeof(BITMAPINFOHEADER); r
,,A%
bih.biSizeImage=size; b1{XGK'
bih.biWidth=btm.bmWidth; fMFlY%@t
bih.biXPelsPerMeter=0; yYvv;E
bih.biYPelsPerMeter=0; sP NAG
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >
AV
R3b
static int filecount=0; (B zf~#]~
CString name;
YErn50L
name.Format("pict%04d.bmp",filecount++); 7F{=bL
name=m_Path+name; @tLoU%
BITMAPFILEHEADER bfh; 4)3!n*I
bfh.bfReserved1=bfh.bfReserved2=0; y[!4M+jj
bfh.bfType=((WORD)('M'<< 8)|'B'); v1j]&3O
bfh.bfSize=54+size; xR,;^R|C
bfh.bfOffBits=54; x{|n>3l`b9
CFile bf; K!9rH>`\
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |V|)cPQ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9/k?Lv
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (d C<N3
bf.WriteHuge(lpData,size); &sx|sLw)
bf.Close(); f-tV8
nCount++; 6)eU &5z1?
} }PY?
ZG
GlobalFreePtr(lpData); aUy=D:\
if(nCount==1) OQh36BM
m_Number.Format("%d picture captured.",nCount); '#.:%4
else rS
4'@a
m_Number.Format("%d pictures captured.",nCount);
ka&-tGg
UpdateData(FALSE); uXNf)?MpA
} VM3H&$d(h
=;3|?J0=
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) CFh&z^]PR
{ u0J+Nj9
if(pMsg -> message == WM_KEYDOWN) o /fq
{ DOWUnJ;5
if(pMsg -> wParam == VK_ESCAPE) CW=-@W7
return TRUE; EtH)E)
if(pMsg -> wParam == VK_RETURN) "A:wWb<m
return TRUE; I$`Vw >
} /j'We-C
return CDialog::PreTranslateMessage(pMsg); ZtEHP`Iin
} HC8{);
V_(?mC
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Iq\sf-1E
{ 9&W\BQ
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7OOB6[.fu
SaveBmp(); S@7A)
return FALSE; cQv*lvG9>
} `4&\ %9
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ i
c]f o
CMenu pop; *qG=p`
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m[{*an\
CMenu*pMenu=pop.GetSubMenu(0); qgca4VV|z
pMenu->SetDefaultItem(ID_EXITICON); C({L4O#?o
CPoint pt; kkrQ;i)Z
GetCursorPos(&pt); _ }!Q4K
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {F
k]X#j
if(id==ID_EXITICON) 2uWzcy ?F
DeleteIcon(); (cYc03"
else if(id==ID_EXIT) :7Vm]xd}do
OnCancel(); 4:<0i0)5
return FALSE; z PV/{)S
} oUw-l_ M]
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |<ke>j/6n
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)
W{;!JI7;z
AddIcon(); HXdPKS4q
return res; O|j5ulO}&"
} 8XJ%Yuu
@;<w"j`r
void CCaptureDlg::AddIcon() J7QlGm,=
{ Y=3Y~
NOTIFYICONDATA data; 1}8e@`G0.]
data.cbSize=sizeof(NOTIFYICONDATA); NE9e brK
CString tip; I/WnF"yP
tip.LoadString(IDS_ICONTIP); r 'jVF'w
data.hIcon=GetIcon(0); _n}!1(xYa`
data.hWnd=GetSafeHwnd(); b9y
E
strcpy(data.szTip,tip); K?T)9
data.uCallbackMessage=IDM_SHELL; V7401@F
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; iMp)g%Ng
data.uID=98; 2
yP#:T/z
Shell_NotifyIcon(NIM_ADD,&data); 5[gkGKkf_
ShowWindow(SW_HIDE); $;;?'!%.
bTray=TRUE; jQ`"Op 3
} %q*U[vv
nLtP^
1~9H
void CCaptureDlg::DeleteIcon() 6xFZv
t
{ K.z}%a
NOTIFYICONDATA data; e('c9 Y
data.cbSize=sizeof(NOTIFYICONDATA); Tz*5;y%4
data.hWnd=GetSafeHwnd();
FxZ\)Y
data.uID=98; uEi!P2zN
Shell_NotifyIcon(NIM_DELETE,&data); Uero!+_
ShowWindow(SW_SHOW); Ew;<iY[
SetForegroundWindow(); )%tf,3
ShowWindow(SW_SHOWNORMAL); s*l_O*$'
bTray=FALSE; 2s{yg%U(
} R9CAw>s
CYrL|{M]
void CCaptureDlg::OnChange() _~cmR<
{ OC>" +
RegisterHotkey(); Jx>P%>+<j
} <m(nZ'Zqz2
r\3In-(AT
BOOL CCaptureDlg::RegisterHotkey() F}01ikXDb'
{ lHGv:TN
UpdateData(); Xj-3C[8@
UCHAR mask=0; \:=Phbn
UCHAR key=0; &e rNVD5o
if(m_bControl) 5;^8wh(
mask|=4; 84knoC
if(m_bAlt) .M!
(|KE4
mask|=2; i5n'f6C
if(m_bShift) QHM39Eu]
mask|=1; ./g0T{&
key=Key_Table[m_Key.GetCurSel()]; kv5Qxj}
if(bRegistered){ ?APzx@$D.
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Qp=uiXs
bRegistered=FALSE; cn\_;TYiJ
} %eah=e
cMask=mask; lT:<ZQyjT
cKey=key; rzTyHK[
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3?geJlD4
return bRegistered; ?B}>[
} u51/B:+
h NoN=J
四、小结 ^Ue.9#9T&g
Ci*5E$+\
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。