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:
H:q )^$s
z29qARiX 一、实现方法
X!7VyE+n ] Wx>)LT 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
IP30y>\ mFqSD #pragma data_seg("shareddata")
" K 8&{= HHOOK hHook =NULL; //钩子句柄
e}'#Xv UINT nHookCount =0; //挂接的程序数目
^])e[RN7?n static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
zd*3R+>U'> static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
ocIt@#20K static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
#cj\~T.,, static int KeyCount =0;
.1.J5>/n static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
O;X(pE/G #pragma data_seg()
9TVB<}0G Qy=HrL]x 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
\Y!T>nWn)I lX98"} DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
Y{k>*: Ax_ HY jMNj0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
s;fVnaqG: cKey,UCHAR cMask)
eeW' [ {
uFwU-LCe BOOL bAdded=FALSE;
)\T@W for(int index=0;index<MAX_KEY;index++){
~Na=+}.q_ if(hCallWnd[index]==0){
XYqpI/s hCallWnd[index]=hWnd;
XJx,9trH HotKey[index]=cKey;
2qZa9^} HotKeyMask[index]=cMask;
3[0w+{(Q bAdded=TRUE;
4GG1E. z} KeyCount++;
SXRdNPXFO break;
K<@[_W+ }
zVM4BT( }
La"o)L +m_ return bAdded;
gd337jw }
\8;Qv //删除热键
V19e> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Qw24/DJK {
.UM<a
Ik BOOL bRemoved=FALSE;
N#(jK1`y for(int index=0;index<MAX_KEY;index++){
8{R_6BS if(hCallWnd[index]==hWnd){
rQ9*J if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)!'n&UxPo$ hCallWnd[index]=NULL;
D4< -8 HotKey[index]=0;
ss?] HotKeyMask[index]=0;
S5i+vUI8C bRemoved=TRUE;
nK+lE0 KeyCount--;
%&^Q(f break;
R<f#r0 3@| }
rr |"r }
j~M#Ss-H8 }
I3Lg?bZ return bRemoved;
%mY| }
CJzm}'NY }qc#lz `S"W8_m DLL中的钩子函数如下:
M[ x_#m| \'n$&PFe LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
X'cf&>h {
u-m %=2 BOOL bProcessed=FALSE;
Q`H#
fS~ if(HC_ACTION==nCode)
B|cA[ {
^9&b+u=X if((lParam&0xc0000000)==0xc0000000){// 有键松开
Da"yZ\4 switch(wParam)
PC*m%
?+ {
CN$I:o04C case VK_MENU:
; D1FAz MaskBits&=~ALTBIT;
5a'yXB} break;
yh S#&)O case VK_CONTROL:
H76E+AY MaskBits&=~CTRLBIT;
}<vvxi break;
:/+>e
IE case VK_SHIFT:
2
9q?$V( MaskBits&=~SHIFTBIT;
+0VG[c\8 break;
Rr%tbt.sE default: //judge the key and send message
$bk>kbl P break;
\X&]FZ(* }
@u,+F0Yd for(int index=0;index<MAX_KEY;index++){
x+4vss if(hCallWnd[index]==NULL)
iJ}2"i7M continue;
(nGkZ}p if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
F[5S(7M
7 {
)))2fskZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#nKRTb+{ bProcessed=TRUE;
/:U1!9.y }
AlO,o[0 }
S|HY+Z6n' }
Ba<ngG
! else if((lParam&0xc000ffff)==1){ //有键按下
SU/G)&Mi switch(wParam)
;t}'X[U {
aC`Li^ case VK_MENU:
}/20%fP MaskBits|=ALTBIT;
Bb~5& @M|N break;
d+tj%7 case VK_CONTROL:
0f1H8zV MaskBits|=CTRLBIT;
ASR-a't6 break;
wTTRoeJ} case VK_SHIFT:
djUihcqA` MaskBits|=SHIFTBIT;
lqF>=15 break;
^%;" [r default: //judge the key and send message
[q'eENG break;
o~= iy }
s3seK6x' for(int index=0;index<MAX_KEY;index++){
*%X.ym' if(hCallWnd[index]==NULL)
Mq@}snp"S continue;
?1CJf>B > if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`|Ey)@w {
!nwbj21% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
SZ/(\kQ6 bProcessed=TRUE;
\*uugw,\y }
@l{I[pp }
)S2iIi;Bq }
G;NB\3~X if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
AP0|z for(int index=0;index<MAX_KEY;index++){
I] jX7.fx if(hCallWnd[index]==NULL)
"J& (:(: continue;
/l^y}o %? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
usy,V"{ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fWj@e"G //lParam的意义可看MSDN中WM_KEYDOWN部分
G]-%AO{K }
MI\]IQU }
Ir/:d]N* }
PK+ x6]x return CallNextHookEx( hHook, nCode, wParam, lParam );
&U&Zo@ot"x }
(xL
:; ailG./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:
+#~O'r]%GG j{)~QD ? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
jB!W2~Z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Y''6NGf eQ<xp A 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:
OF8WDo` 12lEs3 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"R23Pi {
i
j/o;_ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Aq"PG}Ic {
3za`>bUN //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
j7}lF?cJ2 SaveBmp();
MKC$;>i return FALSE;
V\AK6U@r^ }
Y%g "Y …… //其它处理及默认处理
V9T
4+ }
N<liS3> K_>/lirE? y@A6$[%(E| 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。
Ff<)4`J B'p5M.6d#: 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。
b66R}=P l |'<vrn 二、编程步骤
xl8#=qmCD 5mavcle{4r 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";
sLi*SR ?L\z}0# 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
@Dj:4 VhvTBo<cw 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;
@8zT'/$ dF
e4K" 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;
/PqUXF :G 5C ]'t 5、 添加代码,编译运行程序。
6R2uWv C8.W5P[U 三、程序代码
e!Br>^8l %K zbO0 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
x>
\Bxa8 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
&Mj1CvCv #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
BFh$.+D #if _MSC_VER > 1000
/cfHYvnz #pragma once
BI.V0@qZ #endif // _MSC_VER > 1000
A$@o'Q;he #ifndef __AFXWIN_H__
Lm|al.Z #error include 'stdafx.h' before including this file for PCH
Vv4H:BK$ #endif
K_#UZA< Y #include "resource.h" // main symbols
uNbIX:L, class CHookApp : public CWinApp
{y6C0A* {
-!TcQzHUs public:
D0 ruTS CHookApp();
TsD;Kl1 // Overrides
A"4@L*QV // ClassWizard generated virtual function overrides
3ji:O T //{{AFX_VIRTUAL(CHookApp)
<KLg0L<W public:
.S_QQM}Q virtual BOOL InitInstance();
U5<@<j(@ virtual int ExitInstance();
o/1JO_41 //}}AFX_VIRTUAL
G9Qe121m //{{AFX_MSG(CHookApp)
(6R4 \8z2 // NOTE - the ClassWizard will add and remove member functions here.
d}-'<Z#G // DO NOT EDIT what you see in these blocks of generated code !
xNX'~B^4d //}}AFX_MSG
j"hASBTgp DECLARE_MESSAGE_MAP()
TQJF+;% };
t',BI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
2ykCtRe BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
9p`r7: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JIxiklk BOOL InitHotkey();
%[Zz0|A BOOL UnInit();
lzDdD3Ouc #endif
k[9A,N^lZB x=Mm6}/ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Wc|z7P~',% #include "stdafx.h"
z0Xa_w= #include "hook.h"
m*oc)x7' #include <windowsx.h>
CH;;V3 #ifdef _DEBUG
tpYa?ZCM
#define new DEBUG_NEW
DYRE1! #undef THIS_FILE
A1-qtAO] static char THIS_FILE[] = __FILE__;
_z8;lt #endif
0d4cE10 #define MAX_KEY 100
%v4ZGtKC@ #define CTRLBIT 0x04
M#a&\cqC #define ALTBIT 0x02
wmYvD< #define SHIFTBIT 0x01
31}W6l88c #pragma data_seg("shareddata")
Qra> }e%* HHOOK hHook =NULL;
&{W^W8,% UINT nHookCount =0;
4seciz0? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
f#P_xn&et static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
-H\,2FO static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
O2 v. static int KeyCount =0;
FH*RU1Z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]XUSqai #pragma data_seg()
l1<?ONB.# HINSTANCE hins;
V@Wcb$mgk void VerifyWindow();
A5XR3$5P BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
r1Z<:}ZwK //{{AFX_MSG_MAP(CHookApp)
r)b<{u=] // NOTE - the ClassWizard will add and remove mapping macros here.
K@r*;T // DO NOT EDIT what you see in these blocks of generated code!
O<GF> //}}AFX_MSG_MAP
hhmGv9P END_MESSAGE_MAP()
2-v\3voN @^?XaU CHookApp::CHookApp()
YwAnqAg {
kon=il<@ // TODO: add construction code here,
p)/
p!d[T/ // Place all significant initialization in InitInstance
' qy#)F }
7lU.Nit o.^y1mH' CHookApp theApp;
2U9&l1P= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
`o
si"o9 {
8i:[:Z BOOL bProcessed=FALSE;
a)9rs\Is{ if(HC_ACTION==nCode)
16$y`~c-z {
V`k8j-*s if((lParam&0xc0000000)==0xc0000000){// Key up
r7I
B{}>- switch(wParam)
JD~a UB% {
&71e5<(dG case VK_MENU:
If'2rE7J MaskBits&=~ALTBIT;
n93zD*;5 break;
)(bxpW case VK_CONTROL:
j} RzXJ~t MaskBits&=~CTRLBIT;
T~s}N x# break;
yVS\Q,:J9 case VK_SHIFT:
FT/amCRyT MaskBits&=~SHIFTBIT;
HC7JMj break;
U8O(;+ default: //judge the key and send message
zj%cQkZ break;
]W)
jmw'mo }
\+Y!ILOI for(int index=0;index<MAX_KEY;index++){
m;/i<:` if(hCallWnd[index]==NULL)
FFe)e>bH continue;
SLoo:) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\FifzKA {
DJP6TFT&G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Fe$/t( bProcessed=TRUE;
@ls.&BHUP }
jO)&KEh }
'[Gm8K5
}
;[6&0!N\ else if((lParam&0xc000ffff)==1){ //Key down
($WE=biZ& switch(wParam)
f\K#>u*
Q {
2F?kjg, case VK_MENU:
n`L,]dco MaskBits|=ALTBIT;
h0VzIuV break;
nGrVw& case VK_CONTROL:
;nB2o-% MaskBits|=CTRLBIT;
bPd-D-R break;
v8@eW.I1 case VK_SHIFT:
@Fx@5e MaskBits|=SHIFTBIT;
8D~x\!(p\ break;
rt b* n~ default: //judge the key and send message
k
dU!
kj break;
D,rZ0?R }
Z+idLbIs for(int index=0;index<MAX_KEY;index++)
+LzovC@^ {
`6Hf&u< if(hCallWnd[index]==NULL)
97!5Q~I continue;
c> G@+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-G b-^G {
?~F. / SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
gyus8#s T bProcessed=TRUE;
fp&Got!pB }
7+XM3 }
gfo}I2" }
p|VcMxT9- if(!bProcessed){
)5yj/0oT for(int index=0;index<MAX_KEY;index++){
-M61Mw1 if(hCallWnd[index]==NULL)
LprM ;Q_ continue;
=!
mJG if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S,vu]?-8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kRot7-7I| }
+d39f-[ }
:vQM>9l7 }
0Nr\2| return CallNextHookEx( hHook, nCode, wParam, lParam );
WE.Tuo5L }
5$Kf]ZP T*P+Fh" BOOL InitHotkey()
_ #'9kx|) {
oR %agvc^^ if(hHook!=NULL){
JTUNb'#RZ nHookCount++;
lrys3 return TRUE;
xm^95}80yh }
h%1Y6$ else
+ld;k/ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
'_o@VO if(hHook!=NULL)
*not.2+ nHookCount++;
;<-7*}Dj return (hHook!=NULL);
rn" pKUd }
0.DQO; BOOL UnInit()
K]"Kf{bx {
Tf-CEHWD if(nHookCount>1){
<abKiXA" nHookCount--;
-p8e return TRUE;
~A >oO-0K }
bK=c@GXS BOOL unhooked = UnhookWindowsHookEx(hHook);
PDC]wZd/ if(unhooked==TRUE){
!_^g8^>2( nHookCount=0;
Y4To@TrN#\ hHook=NULL;
Z"tQpJg }
qrDcL>Hrn return unhooked;
/`+7_=- }
*K)0UKBr ~:2K#q5C BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8:{q8xZ=k {
\A(5;ZnuD BOOL bAdded=FALSE;
3k{ @.V?] for(int index=0;index<MAX_KEY;index++){
_^T}_ if(hCallWnd[index]==0){
yGEb7I$h hCallWnd[index]=hWnd;
9X]f [^ HotKey[index]=cKey;
Q!$IQJ]|Y HotKeyMask[index]=cMask;
D 'L{wm bAdded=TRUE;
;Qa;@ KeyCount++;
ZvH{wt
break;
t)I0lnbs }
\"d?=uFe }
=Ahw%`/&}] return bAdded;
Z[}
$n-V }
oVkr3KZ p>p'.#M BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
OCW+?B; {
Qp!J:YV BOOL bRemoved=FALSE;
{A3m+_8 for(int index=0;index<MAX_KEY;index++){
#:{6b*} if(hCallWnd[index]==hWnd){
@ER1zKK? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
x/ I;nMY hCallWnd[index]=NULL;
0<&M?^ HotKey[index]=0;
w3bIb$12 HotKeyMask[index]=0;
u^=@DO' bRemoved=TRUE;
K-4tdC3 KeyCount--;
0QoLS|voA/ break;
5Y-2
# }
PU+1=%'V }
%F5 =n" }
,so4Lb(vG return bRemoved;
!}q."%%J_% }
rzV"Dm$' 7bT
/KLU void VerifyWindow()
J@`
8(\( {
DHzkRCM for(int i=0;i<MAX_KEY;i++){
7;xKy'B\ if(hCallWnd
!=NULL){ q\H7&w
if(!IsWindow(hCallWnd)){ 1+^n!$
hCallWnd=NULL; F+*Q <a4
HotKey=0; %6 ]\^
HotKeyMask=0; 4oJ$dN
KeyCount--; U**)H_S/~
} yW>R RE;
} J3&Sj{ o
} JS7dsO0;
} F< |c4
*?N<S$m
BOOL CHookApp::InitInstance() <E}N=J'uJ
{ )ddsyFGW
AFX_MANAGE_STATE(AfxGetStaticModuleState()); P6we(I`"2
hins=AfxGetInstanceHandle(); +*a7GttU
InitHotkey(); IJIQ"
s
return CWinApp::InitInstance(); ~:Ixmqi}R
} q^6N+ ^}QN
Wp4K6x
int CHookApp::ExitInstance() *w 21U!
{ |EeBSRAfe
VerifyWindow(); o7arxo\
UnInit(); @dV9Dpu
return CWinApp::ExitInstance(); T6=-hA^A
} ;eh/_hPM
]xrD<
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CB({Rn
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (}0S1)7t
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cY~M4:vgT
#if _MSC_VER > 1000 4\1;A`2%0
#pragma once YFqZe6g0$
#endif // _MSC_VER > 1000 K;C_Z/<%
8[HZ@@
class CCaptureDlg : public CDialog 9K$]h2
{ 8^T2^gs
// Construction UoRDeYQ`E
public: -<d(
BOOL bTray; !x_t`78T
BOOL bRegistered; {Zwf..,
BOOL RegisterHotkey(); 8KKz5\kn7
UCHAR cKey; k_O-5{
UCHAR cMask; 1p=&WM
void DeleteIcon(); yjd(UWE
void AddIcon(); Y Z\@)D;
UINT nCount; GBr,LN
void SaveBmp(); -t>Z
9
CCaptureDlg(CWnd* pParent = NULL); // standard constructor M8_ R
// Dialog Data G"C;A`6
//{{AFX_DATA(CCaptureDlg) .q inR6=
enum { IDD = IDD_CAPTURE_DIALOG }; 9A<0zt
CComboBox m_Key; mt^`1ekoY
BOOL m_bControl; \!4|tBKVY
BOOL m_bAlt; cD8Ea(
BOOL m_bShift; @T/q d>T o
CString m_Path; GEfY^!F+
CString m_Number; U2UyN9:6F
//}}AFX_DATA - p^'XL*Z
// ClassWizard generated virtual function overrides P'F~\**5
//{{AFX_VIRTUAL(CCaptureDlg) g8v[)o(qd
public: P4[]qbfd,
virtual BOOL PreTranslateMessage(MSG* pMsg); @it/$>R^)
protected: e&ts\0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +9_ ,w bF
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @E(P9zQ/zy
//}}AFX_VIRTUAL V" }*"P-%
// Implementation 6lZGcRO
protected: WP!il(Gr
HICON m_hIcon; z \^
// Generated message map functions Se/ss!If
//{{AFX_MSG(CCaptureDlg) N-Z^G<[q.
virtual BOOL OnInitDialog(); ,P~QS
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !U[:5@s06
afx_msg void OnPaint(); Pv[ykrm/
afx_msg HCURSOR OnQueryDragIcon(); Tplg2p%k
virtual void OnCancel(); H\d;QN9Q;
afx_msg void OnAbout(); aPt{C3<
afx_msg void OnBrowse(); N5ci};?
afx_msg void OnChange(); :fW.-^"VP
//}}AFX_MSG <k5`&X!+
DECLARE_MESSAGE_MAP() My],6va^
}; EO"6Dq(
#endif w-M7opkq
J7Sx!PQ
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file u9,=po=+7f
#include "stdafx.h" aC}p^Nkr"k
#include "Capture.h" s" N\82z)
#include "CaptureDlg.h" -`g J
#include <windowsx.h> 2;h+;G
#pragma comment(lib,"hook.lib") MU*It"@}2
#ifdef _DEBUG cPSti
#define new DEBUG_NEW :-U53}Iy
#undef THIS_FILE tStJ2-5*t
static char THIS_FILE[] = __FILE__; ]6q*)q:`
#endif St_Sl:m$
#define IDM_SHELL WM_USER+1 1[px`%DR~
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >-eS&rma
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s*eyTm
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }9
?y'6l
class CAboutDlg : public CDialog ]An_5J
{ xjE7DCmA
public: ] .`_,
IO
CAboutDlg(); k3#wLJ
// Dialog Data ZLuPz#
//{{AFX_DATA(CAboutDlg) qNy-o\;XN
enum { IDD = IDD_ABOUTBOX }; 8,H~4Ce3
//}}AFX_DATA w7r'SCVh3+
// ClassWizard generated virtual function overrides 1Lc8fP$
//{{AFX_VIRTUAL(CAboutDlg) @H6%G>K,
protected: m$)YYpX
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1NW>wo
//}}AFX_VIRTUAL 8ZFH}v@V1'
// Implementation shD+eHo$
protected: PH[4y:^DN
//{{AFX_MSG(CAboutDlg) Agz=8=S%
//}}AFX_MSG Pm~,Ky&Hl
DECLARE_MESSAGE_MAP() 9V.+U7\w
}; /K[]B]1NE
$.;iu2iyo
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K('
9l& A
{ k 5t{
//{{AFX_DATA_INIT(CAboutDlg) 'Z y{mq\
//}}AFX_DATA_INIT ~RAzFLt6x
} fs7~NY
pRb<wt7v
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }&C dsCM>2
{ ?S8$5gA
CDialog::DoDataExchange(pDX); A_aO}oBX
//{{AFX_DATA_MAP(CAboutDlg) fG3wc
l~
//}}AFX_DATA_MAP PMQb\%iE"
} G%Y*q(VrEu
sFCf\y
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K[n<+e;G
//{{AFX_MSG_MAP(CAboutDlg) \Ec
X!aC
// No message handlers ~R)1nN|
//}}AFX_MSG_MAP =1eV
END_MESSAGE_MAP() vu44 !c@
UC.8DaIPN
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DhHtz.6
: CDialog(CCaptureDlg::IDD, pParent) z"9aAytd
{ r.?qEe8VV
//{{AFX_DATA_INIT(CCaptureDlg) GsI[N%
m_bControl = FALSE; 6<#Slw[
m_bAlt = FALSE; LMt0'Ml9
m_bShift = FALSE; rYD']%2
m_Path = _T("c:\\"); 4a#B!xW
m_Number = _T("0 picture captured."); A (PE
nCount=0; ybC-f'0
bRegistered=FALSE; ,#=eu85'
bTray=FALSE; SCqu,
//}}AFX_DATA_INIT n<=y"*
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 x, }ez
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w' .'Yu6
} y(V&z"wk[
hjw4Xzju
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) t2~"B&7My
{ /nwxuy
CDialog::DoDataExchange(pDX); uwmoM>I W^
//{{AFX_DATA_MAP(CCaptureDlg) <1TlW
~q<
DDX_Control(pDX, IDC_KEY, m_Key); !,I7 ?O
DDX_Check(pDX, IDC_CONTROL, m_bControl); u<x[5xH+
DDX_Check(pDX, IDC_ALT, m_bAlt); j)<;g(
DDX_Check(pDX, IDC_SHIFT, m_bShift); b!0'Qidh0
DDX_Text(pDX, IDC_PATH, m_Path); }#1UD
DDX_Text(pDX, IDC_NUMBER, m_Number); er#8D6*
//}}AFX_DATA_MAP K3j_C`Se
} "4KkKi
X>3iYDe
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &~z+ R="=
//{{AFX_MSG_MAP(CCaptureDlg) tX+0 GLz
ON_WM_SYSCOMMAND() cAYa=}~<
ON_WM_PAINT() ;O Q#@|D
ON_WM_QUERYDRAGICON() <Sz>ZIISd
ON_BN_CLICKED(ID_ABOUT, OnAbout) )r-T=
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zw}@nqp
ON_BN_CLICKED(ID_CHANGE, OnChange) cb\jrbj6
//}}AFX_MSG_MAP 0~Um^q*'3
END_MESSAGE_MAP() +oE7~64LL
Q]yV:7
BOOL CCaptureDlg::OnInitDialog() L[`R8n1C
{ '#;,oX~5
CDialog::OnInitDialog(); [Od>NO,n+]
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 38Bnf
ASSERT(IDM_ABOUTBOX < 0xF000); 4x=V|"
CMenu* pSysMenu = GetSystemMenu(FALSE); Pn~pej5'K
if (pSysMenu != NULL) 8XLxT(YFIs
{ nh _DEPMq
CString strAboutMenu; Ry3+/]
strAboutMenu.LoadString(IDS_ABOUTBOX); ORUWslMt
if (!strAboutMenu.IsEmpty()) F<6KaZ|
{ #|)JD@;Q
pSysMenu->AppendMenu(MF_SEPARATOR); t-3v1cv"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3?a0
+]
} @m*&c* r
} 0sq=5 BnO
SetIcon(m_hIcon, TRUE); // Set big icon )pkhir06t
SetIcon(m_hIcon, FALSE); // Set small icon rD:gN%B=
m_Key.SetCurSel(0); x.j Yip
RegisterHotkey(); Ukk-(gjX
CMenu* pMenu=GetSystemMenu(FALSE); UchALR^5
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <B|n<R<?
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K,`).YK
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AAIyr703cQ
return TRUE; // return TRUE unless you set the focus to a control ]>]#zu$=c
} o=mq$Z:}
hNu>s
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dSA
[3V
{ .WN;TjEg!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) I!C(K^
{ WLg6-@kxXs
CAboutDlg dlgAbout; -o=P85V
dlgAbout.DoModal(); eXskwV+7
} r6gt9u:
else @m !9"QhC
{ @&nx;K6h
CDialog::OnSysCommand(nID, lParam); ^.pE`l%1}
} m'G?0^Ft
} N7RG5?
&0;{lS[N:L
void CCaptureDlg::OnPaint() P#vv+]/
{ 3B!&ow<rt
if (IsIconic()) N}.Q%&6:
{ l<0[ K(
CPaintDC dc(this); // device context for painting C,sD?PcSi+
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2n-Tpay0
// Center icon in client rectangle ,H#qgnp
int cxIcon = GetSystemMetrics(SM_CXICON); SK2J`*
int cyIcon = GetSystemMetrics(SM_CYICON); F^ %{
;
CRect rect; ihpz}g
GetClientRect(&rect); Z~-T0Ab-
int x = (rect.Width() - cxIcon + 1) / 2; f)u*Q!BDD
int y = (rect.Height() - cyIcon + 1) / 2; %x cM_|AyR
// Draw the icon <3],C)Zwc
dc.DrawIcon(x, y, m_hIcon); =F^->e0N
} }iiG$?|.
else ne!j%9Ar
{ z[0LU]b<
CDialog::OnPaint(); q/ d5P
} 1pYmtr
} 0`g}(}'L
`JY>v io
HCURSOR CCaptureDlg::OnQueryDragIcon() |p=.Gg=2
{ $v?! 6:
return (HCURSOR) m_hIcon; ,J`lr
U0
}
Rsa\V6N>
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void CCaptureDlg::OnCancel() ulz\x2[Pf
{ Oo3qiw
if(bTray) _.Z&<.lJ
DeleteIcon(); <'o 'H
CDialog::OnCancel(); %z!d4J75
} {"gyXDE1
MQbNWUi
void CCaptureDlg::OnAbout() ..Uw8u/
{ @^XkU(m
CAboutDlg dlg; &bS"N)je
dlg.DoModal(); @kCD.
} Yt O@n@1
u75)>^:I
void CCaptureDlg::OnBrowse() {'=Nb
5F
{ pdcwq~4~%
CString str; CL<KBmW7
BROWSEINFO bi; ,XBV }y
char name[MAX_PATH]; Dbkuh!R
ZeroMemory(&bi,sizeof(BROWSEINFO)); c9ov;Bw6S
bi.hwndOwner=GetSafeHwnd(); Q'Q72Fg
bi.pszDisplayName=name; q.,p6D
bi.lpszTitle="Select folder"; \/x)BE,
bi.ulFlags=BIF_RETURNONLYFSDIRS; &[W3e3Asra
LPITEMIDLIST idl=SHBrowseForFolder(&bi); *k@0:a(>
if(idl==NULL) 0]2B-o"kI
return; NZ%~n:/V#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?V\9,BTb)
str.ReleaseBuffer(); KHc/x8^9
m_Path=str; gqJEJ~
if(str.GetAt(str.GetLength()-1)!='\\') Cr
V2 V)|G
m_Path+="\\"; ~\@<8@N2a6
UpdateData(FALSE); :}3qZX
} iuU3*yyn
wE8a4.
void CCaptureDlg::SaveBmp() /F8\%l+
{ xJF6l!`
CDC dc; J.1ln
=Y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); S\{^LVXTMd
CBitmap bm; ~d#;r5>
int Width=GetSystemMetrics(SM_CXSCREEN); Y+"hu2aPkY
int Height=GetSystemMetrics(SM_CYSCREEN); )o'U0rAx|a
bm.CreateCompatibleBitmap(&dc,Width,Height); &"H<+>`
CDC tdc; x9o^9QJh
tdc.CreateCompatibleDC(&dc); xJH9qc ME
CBitmap*pOld=tdc.SelectObject(&bm); -Y jv&5
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0@mX4.!
tdc.SelectObject(pOld); 8)q]^
BITMAP btm; yZ(Nv $[5
bm.GetBitmap(&btm); yK>0[6l
DWORD size=btm.bmWidthBytes*btm.bmHeight; i6g[E4nk
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3Ld ;zW
BITMAPINFOHEADER bih; +{Vwz
bih.biBitCount=btm.bmBitsPixel; sKB-7
bih.biClrImportant=0; a m k42
bih.biClrUsed=0; ,TfI
bih.biCompression=0; SU#P.y18%
bih.biHeight=btm.bmHeight; <
jocfTBk
bih.biPlanes=1; .^`a6>EQ)|
bih.biSize=sizeof(BITMAPINFOHEADER); ,d [b"]Zy
bih.biSizeImage=size; /YugQ.>| l
bih.biWidth=btm.bmWidth; Uc4L|:
bih.biXPelsPerMeter=0; }2!5#/^~
bih.biYPelsPerMeter=0; d;jJe0pH
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zhvk%Y:
static int filecount=0; TLL[F;uZ
CString name; 6t mNfI34
name.Format("pict%04d.bmp",filecount++); Eztz~oFo
name=m_Path+name; E_gDwWot
BITMAPFILEHEADER bfh; LN3dp?;_{
bfh.bfReserved1=bfh.bfReserved2=0; divZJc
bfh.bfType=((WORD)('M'<< 8)|'B'); #u2&8-Gh
bfh.bfSize=54+size; z:Zn.e*$b
bfh.bfOffBits=54; * /Ry6Yu
CFile bf; 9bcyPN
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E[Ws} n.
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); fF-\TW
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j+B5m:ExfI
bf.WriteHuge(lpData,size); 6quWO2x
bf.Close(); D@b<}J>0'
nCount++; T~~$=vP9
} `Py=
?[cD
GlobalFreePtr(lpData); 3_eml\CY
if(nCount==1) Mb2 L32
m_Number.Format("%d picture captured.",nCount); )}it,<
else ;R|#ae@
m_Number.Format("%d pictures captured.",nCount); sr($Bw
UpdateData(FALSE); \`%Y-!H+v
} <iprPk
D15u1A
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _d=&9d#=\
{ ://#
%SE
if(pMsg -> message == WM_KEYDOWN) \A\yuJ=
{ (R*jt,x
if(pMsg -> wParam == VK_ESCAPE) zQj%ds:
return TRUE; :iNAXy
if(pMsg -> wParam == VK_RETURN) 5iI3u 7Mn1
return TRUE; .bBQhf.&"
} ]pP2c[;
return CDialog::PreTranslateMessage(pMsg); 16> >4U:Y
} =&b$W/l)0
-S3+
h$Y8
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UV8r&O
{ 8W<)c
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &'ETx"
SaveBmp(); QKaj4?p$|S
return FALSE; ut5!2t$c
} \/4%[Q2QDm
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ S{)n0/_
CMenu pop; >]Yha}6h
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ZO0]+Ko
CMenu*pMenu=pop.GetSubMenu(0); E+c3KqM
pMenu->SetDefaultItem(ID_EXITICON); z&vms
CPoint pt; Qu>zO !x
GetCursorPos(&pt); rn5g+%jX*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);
UoS;!}l
if(id==ID_EXITICON) ]XafFr6pe
DeleteIcon(); 0V,MDX}#_
else if(id==ID_EXIT) HXV73rDA
OnCancel(); Di"9 M(6vf
return FALSE; +2fJ
} @[kM1:G-F{
LRESULT res= CDialog::WindowProc(message, wParam, lParam); NlEWm8u
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "PScM9) \
AddIcon(); F*].
return res; 4Hpu EV8Q
} utl=O
GGL4<P7
void CCaptureDlg::AddIcon() wfTv<WG,.E
{ ?uX6X'-
NOTIFYICONDATA data; U9[A(
data.cbSize=sizeof(NOTIFYICONDATA); ec[[OIO
CString tip; /\$|D&e
tip.LoadString(IDS_ICONTIP); KeHE\Fq^V
data.hIcon=GetIcon(0); KB *#t
data.hWnd=GetSafeHwnd(); xPJJ
!mY
strcpy(data.szTip,tip);
nK'8Mo
data.uCallbackMessage=IDM_SHELL; %+B-Z/1}
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; r~fl=2>yQ
data.uID=98; 9}0Jc(B/x
Shell_NotifyIcon(NIM_ADD,&data); "/Q(UV<d
ShowWindow(SW_HIDE); mS&\m#s<
bTray=TRUE; xA'#JN<*
} [,$mpJCI
K}/`YDu
void CCaptureDlg::DeleteIcon() WJ8vHPSM
{ +Y]*>afG
NOTIFYICONDATA data; *`pBQZn05O
data.cbSize=sizeof(NOTIFYICONDATA); la{uJ9Iw@}
data.hWnd=GetSafeHwnd(); +siNU#!
data.uID=98; 8Y~T$Yj^
Shell_NotifyIcon(NIM_DELETE,&data); >upUY(3&
ShowWindow(SW_SHOW); RkP|_Bf8)
SetForegroundWindow(); $5CY<,f
ShowWindow(SW_SHOWNORMAL); 9x^
/kAB
bTray=FALSE; m:Cx~
}
'L59\y8H
"v(]"L
void CCaptureDlg::OnChange() `/ReJj&~
{ uWtS83i
RegisterHotkey(); 2pNJWYW"
} "_@+/Iy.
fvMhq:Bu
BOOL CCaptureDlg::RegisterHotkey() $<%
nt
{ -t'oW*kdL
UpdateData(); vk+%#w
UCHAR mask=0; ZjW| qb
UCHAR key=0; !enz05VW6.
if(m_bControl) EjE`S_i=
mask|=4; XTaWd0Y
if(m_bAlt) !;C(pnE
mask|=2; R{A/+7!
if(m_bShift) H08YMP>dc
mask|=1; 7.rZ%1N
key=Key_Table[m_Key.GetCurSel()]; &0Zk3D4
if(bRegistered){ ^K8a#-
DeleteHotkey(GetSafeHwnd(),cKey,cMask); U9sub6w 6
bRegistered=FALSE; '?GZ"C2
} @5V Z
cMask=mask; uOqDJM'RM
cKey=key; vS__*}^
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |F{E4mg(o
return bRegistered; rPvX8*)tV
} ,;pX.Ob U
V*uu:
四、小结 t
U=b~
}eFUw
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。