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:
YLNJ4nE
/s`8=+\9 一、实现方法
g/z7_Aq/ C1(0jUz 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
J+nUxF;EE Z2{G{]EV( #pragma data_seg("shareddata")
Ix+\oq,O HHOOK hHook =NULL; //钩子句柄
=(as{,j UINT nHookCount =0; //挂接的程序数目
c ^+{YH;k static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
}C{wGK+o[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
-]Q6Ril static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
:8Ql(I static int KeyCount =0;
I#:4H2H6 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-*0U&]T #pragma data_seg()
|s[k= /~" iFB {a?BE 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。
vt2A/9_Z% j
!rQa^ 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:
":Ll.=! kKNrCv@64d BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
0bI}
s`sr cKey,UCHAR cMask)
y[~w2a&+ {
ty)~]!tA BOOL bAdded=FALSE;
]n&Eb88 for(int index=0;index<MAX_KEY;index++){
%1PNP<3r0 if(hCallWnd[index]==0){
:J;*]o: hCallWnd[index]=hWnd;
{$qLMx'; HotKey[index]=cKey;
+m1y#|08 HotKeyMask[index]=cMask;
R(cM4T.a bAdded=TRUE;
MN. $a9m KeyCount++;
.hytn`+9 break;
F*/J`l }
]@mV9:n{ }
#BwkbOgr return bAdded;
0r'<aA`=I }
aiwKkf`\ //删除热键
~g|z7o BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\~@a/J {
De:| T8& BOOL bRemoved=FALSE;
~e<h2/Xc for(int index=0;index<MAX_KEY;index++){
}>~]q)] if(hCallWnd[index]==hWnd){
LRmH@-qP if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ZE0D= hCallWnd[index]=NULL;
V.kRV{43 HotKey[index]=0;
rh 7%<xb> HotKeyMask[index]=0;
&0%x6vea bRemoved=TRUE;
~{gV`nm=J KeyCount--;
^Y+P(o$HM break;
vvcA-k? }
85]3y%f9 }
j21nh >d }
Pa\"l'!>^ return bRemoved;
VF] ~J=>i }
u(g0Ob t73" d#+ =?gDM[t^ DLL中的钩子函数如下:
B|6_4ry0U Q\[2BJo/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
3!0~/8!f@ {
e?)ic\K BOOL bProcessed=FALSE;
vSG$2g= if(HC_ACTION==nCode)
)l"py9STF {
o[E|xw if((lParam&0xc0000000)==0xc0000000){// 有键松开
6,UW5389 switch(wParam)
};s8xGW:k3 {
7xy[; case VK_MENU:
1;N5@0%p MaskBits&=~ALTBIT;
`KUl
XS( break;
1|/]bffg!c case VK_CONTROL:
iF'qaqHWY4 MaskBits&=~CTRLBIT;
tw%z!u[a break;
tg'2v/ case VK_SHIFT:
a!Ht81gj MaskBits&=~SHIFTBIT;
7,&M6<~ break;
YVS~|4hu?i default: //judge the key and send message
SdQ"S-H break;
rq_0"A }
t*{BN>B for(int index=0;index<MAX_KEY;index++){
r*XEne if(hCallWnd[index]==NULL)
i*ErxWzu continue;
68-2EWq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g6~B|?! {
'n4$dv%q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
-"MB(` bProcessed=TRUE;
}0z]sYI }
t}q\. }
kKEs >a }
s2ixiv= else if((lParam&0xc000ffff)==1){ //有键按下
On4tK\l@ switch(wParam)
TIre,s)_ {
Tkf
JC|6 case VK_MENU:
k@/s-^ry3 MaskBits|=ALTBIT;
|ww@V<'/# break;
X6<%SJC case VK_CONTROL:
( ,!G$~Sy MaskBits|=CTRLBIT;
r\DA&b break;
RDWUy(iX case VK_SHIFT:
t1MK5B5jH MaskBits|=SHIFTBIT;
N#zh$0!8bJ break;
MiB}10 default: //judge the key and send message
~gJJ@j 0n break;
<b$.{&K }
Qvl3=[S for(int index=0;index<MAX_KEY;index++){
2{fPQQ;# if(hCallWnd[index]==NULL)
iX\]-_D continue;
T99\R% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b!3Y<D* {
{Jn*{5tZ> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
A4`3yy{0- bProcessed=TRUE;
\GEf,%U<K }
^7>k:|7-t }
IMtfi(Y%F }
"D1u2>( if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
?3|jB?:k for(int index=0;index<MAX_KEY;index++){
0; BX if(hCallWnd[index]==NULL)
X[r\ Qa continue;
'|^<|S_+K if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
i_M0P1 2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~rICPR //lParam的意义可看MSDN中WM_KEYDOWN部分
[+4/M3J% }
$:D-dUr1 }
rI.CCPY~s }
GB\1' return CallNextHookEx( hHook, nCode, wParam, lParam );
h#Q Sx@U6 }
>hsvRX\_` lZf=# 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:
1K&l}/zUl |\k,qVQ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u#r[JF9LP BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
+4]31d&3 h}knn3"S 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:
5w#7B T(2*P5%& LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
W_%@nm\y {
CPt62j8 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
1b4/ {
$zv&MD!&h //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
nTQ&nu! SaveBmp();
0AWOdd>. return FALSE;
v3]mZ}W$ }
wi$,Y.: …… //其它处理及默认处理
^DH*\ee }
*p Q'w Vnvfu!>( yirQ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
9w:9XziT bj$VYS"kY 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。
c|KN@)A ?4A$9H 二、编程步骤
z(g6$Y{ ~H1ZQ[ 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";
MR`lF-|a| hF;TX.Y6 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
49d02AU% Tw0GG8(c 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;
9XEP:}5, bji^b@us_ 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;
8PXjdHR $-ICTp 5、 添加代码,编译运行程序。
[JyhzYf\ [oS4WP 三、程序代码
v|
Yh]y odaCKhdk ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
L2<IG)oXU #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<2,NWn. #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
h5^qo ^;g7 #if _MSC_VER > 1000
FBGe s[, #pragma once
o7=#ye&P #endif // _MSC_VER > 1000
aTU[H~dTU #ifndef __AFXWIN_H__
R?L?6~/q #error include 'stdafx.h' before including this file for PCH
` 5lW #endif
@:%p#$V #include "resource.h" // main symbols
cf`g.9pjlx class CHookApp : public CWinApp
_ISaO
C{2- {
B57MzIZi] public:
#WqpU. CHookApp();
5R}K8"d // Overrides
'Tbdo >y // ClassWizard generated virtual function overrides
T;`2t; //{{AFX_VIRTUAL(CHookApp)
ScCA8JgY public:
u|{(m_"H virtual BOOL InitInstance();
S\"#E:A virtual int ExitInstance();
]21`x //}}AFX_VIRTUAL
x*7Q //{{AFX_MSG(CHookApp)
"
.<>(bE // NOTE - the ClassWizard will add and remove member functions here.
s=[T,:Z // DO NOT EDIT what you see in these blocks of generated code !
$LOwuvu> //}}AFX_MSG
AJ"a DECLARE_MESSAGE_MAP()
Lh;U2pA };
\h48]ZjC` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
tB)nQw7 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>O$JS, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
y)*W!]:7^> BOOL InitHotkey();
u0{R;) BOOL UnInit();
&w'1 #endif
e gdbv *VV#o/Qp //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
;6AanwR6 #include "stdafx.h"
\S]` { kY, #include "hook.h"
YU ,fx<c #include <windowsx.h>
Da-U@e! #ifdef _DEBUG
V ah&)&n #define new DEBUG_NEW
-,a@bF: #undef THIS_FILE
0i3Z7l] static char THIS_FILE[] = __FILE__;
{baG2Fe1`b #endif
,`,1s9\&t #define MAX_KEY 100
NE5H\ #define CTRLBIT 0x04
Z66h #define ALTBIT 0x02
"[
#. #define SHIFTBIT 0x01
cJLAP%.L #pragma data_seg("shareddata")
=Vat2'>+ HHOOK hHook =NULL;
/mG-g%gE UINT nHookCount =0;
%n@ ^$&,&; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Y?#aUQc static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
vTsMq>%,< static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ou7nk:I@ static int KeyCount =0;
J?"v;.K|hU static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
X+[h]A #pragma data_seg()
k3CHv =U{ HINSTANCE hins;
6;Sz^W void VerifyWindow();
JA2oy09G BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
7KJ%-&L^ //{{AFX_MSG_MAP(CHookApp)
^@HWw@GA // NOTE - the ClassWizard will add and remove mapping macros here.
31&;3?3> // DO NOT EDIT what you see in these blocks of generated code!
MN^d28^/ //}}AFX_MSG_MAP
m(KBg'kQ END_MESSAGE_MAP()
9}A\BhtiM K,5_{pj CHookApp::CHookApp()
^I:f4RWo {
~A03J:Yc7 // TODO: add construction code here,
/{>_'0 // Place all significant initialization in InitInstance
u9u'!hAGH }
V>(>wSR WX4f3Um CHookApp theApp;
k7kPeq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
}uiD8b{I {
3g87i r BOOL bProcessed=FALSE;
a[=;6! if(HC_ACTION==nCode)
}fZ~HqS2w {
5$ &',v( if((lParam&0xc0000000)==0xc0000000){// Key up
utU;M* switch(wParam)
5Zuk`%O {
h@CP case VK_MENU:
aIo%~w MaskBits&=~ALTBIT;
Xmw%f[Xl break;
Jp"[` m case VK_CONTROL:
Vy 7 )_D MaskBits&=~CTRLBIT;
p}p}!M| break;
}6"l`$=Ev case VK_SHIFT:
FBeo@ MaskBits&=~SHIFTBIT;
hdDL92JVg break;
)(+q~KA} default: //judge the key and send message
_sAcvKH break;
sL],@z8<k }
{RN-rF3w for(int index=0;index<MAX_KEY;index++){
sB0m^Y' if(hCallWnd[index]==NULL)
:"'*1S* continue;
O`Y@U?^N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
s0m k<>z {
KGrYF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*FFD G_YG? bProcessed=TRUE;
0@wXE\s }
/BwG\GhM }
1h3`y }
lUIh0%O else if((lParam&0xc000ffff)==1){ //Key down
sspGB>h8l switch(wParam)
y7vA[us {
L, 2;-b| case VK_MENU:
H"c2kno9 MaskBits|=ALTBIT;
nT9Hw~f<j break;
L KLLBrm: case VK_CONTROL:
A"/|h]. MaskBits|=CTRLBIT;
C6A!JegU break;
)Lg~2]'?j case VK_SHIFT:
?{%"v\w MaskBits|=SHIFTBIT;
'HJ<"< break;
0IyT(1hS default: //judge the key and send message
3QCCX$, break;
Ym?VF{e, }
0[p"8+x for(int index=0;index<MAX_KEY;index++)
f h:wmc' {
K=>j+a5$ if(hCallWnd[index]==NULL)
kGu{[Rh continue;
F_@?'#m if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
70{B/ ($ {
Fg0!2MKq* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
O-ppR7edh bProcessed=TRUE;
T%aM~dp }
U$WGe >, }
gF:|j( }
=7F?'&LC if(!bProcessed){
xy4P_ for(int index=0;index<MAX_KEY;index++){
B:ugEAo_ if(hCallWnd[index]==NULL)
7n*"9Ai( continue;
XB]>Z) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~-UO^$M- SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9\uBX.]x }
3|%058bF }
X|C=Q }
e.W <pI, return CallNextHookEx( hHook, nCode, wParam, lParam );
T^q^JOC4 }
[x'D+! izu_1X BOOL InitHotkey()
:q~5Xw/ {
BS%pS( if(hHook!=NULL){
Rm`P.;% nHookCount++;
_w2%!+' return TRUE;
S~)_=4Z }
YMVmpcz else
<sSH^J4QqX hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,y@WFRsx if(hHook!=NULL)
53>(2 _/[r nHookCount++;
7~);,#[ky return (hHook!=NULL);
Gd$!xN%O }
WWC&-Ni BOOL UnInit()
5n1`$T.WG {
\-sW>LIA if(nHookCount>1){
"{kE#`c6<n nHookCount--;
Gl"hn return TRUE;
7}e5a c }
y6Ez.$M BOOL unhooked = UnhookWindowsHookEx(hHook);
6n~)R if(unhooked==TRUE){
y}?PyPz nHookCount=0;
}2S)CL= hHook=NULL;
>v f-,B }
DK20}&RQ return unhooked;
"H=N>=g0E }
EMpq+LrN =R ZPDu BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{,1>( {
bjI3xAs~ BOOL bAdded=FALSE;
gYbcBb%z for(int index=0;index<MAX_KEY;index++){
%V#MUi1 if(hCallWnd[index]==0){
lM#,i\8Q hCallWnd[index]=hWnd;
P1)87P HotKey[index]=cKey;
Frz HotKeyMask[index]=cMask;
cc>b#&s bAdded=TRUE;
CIf@G>e- KeyCount++;
7{7Y[F0 break;
9E Y`j,{4 }
rz&'wCiOO }
;-BN~1Jg return bAdded;
\En"=)A }
BoOuN94 u~>G8y)k9O BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
gXU(0(Gq {
|Y?<58[!) BOOL bRemoved=FALSE;
5<Uh2c for(int index=0;index<MAX_KEY;index++){
Ep:hObWG) if(hCallWnd[index]==hWnd){
QcJC:sP\> if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
*e<}hmDr hCallWnd[index]=NULL;
m*YfbOhs# HotKey[index]=0;
k_uI&, HotKeyMask[index]=0;
U$3DIJVI bRemoved=TRUE;
bC98<if KeyCount--;
k+*pg4' break;
<Q"G
aqZ }
w%..*+P }
r=SCbv }
FP}I+Ys return bRemoved;
"K$c 9Z8 }
X6_
RlV]Sk ofw&?Sk0 void VerifyWindow()
}q'IY:r {
LI&E.(: for(int i=0;i<MAX_KEY;i++){
*SIYZE' if(hCallWnd
!=NULL){ 4:^MSgra
if(!IsWindow(hCallWnd)){ [\Nmm4
hCallWnd=NULL; 0rz1b6F5,
HotKey=0; R4P&r=?
HotKeyMask=0; uK`gveY
KeyCount--; #5kclu%L$
} 4;3Vc%
} kFY2VPP~
} </@5>hx/
} = :zPT;K
.'Q*_};W
BOOL CHookApp::InitInstance() qY'+@^<U;
{ 1]5k lJ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); <
W`gfpzO
hins=AfxGetInstanceHandle(); ;|Hpg_~%>
InitHotkey(); C.":2F;-e
return CWinApp::InitInstance(); a5saN5)H
} <DPRQhNW]
jkta]#O
int CHookApp::ExitInstance() 6<>1,wbq
{ }{j@q~w>$
VerifyWindow(); Mis B&Ok`k
UnInit(); i$$h6P#
return CWinApp::ExitInstance(); ,x!r^YO=
} oXqJypR 2
l4.ql1BX@y
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =$^90Q,Z;
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }* }F_Y+
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ::'Y07
#if _MSC_VER > 1000 ~piE$"]&
#pragma once HeO&p@
#endif // _MSC_VER > 1000 RticGQy&5
5h^BXX|Y*
class CCaptureDlg : public CDialog 1?^
P=^8
{ Ejr'Yzl3_
// Construction H!hd0.
public: BqHqS
BOOL bTray; | 4}Y:d
BOOL bRegistered; %4F\#" A
BOOL RegisterHotkey(); \`["IkSg7
UCHAR cKey; X>Q4 4FV!
UCHAR cMask; K(PSGlI f
void DeleteIcon(); ]!P8 {xmb@
void AddIcon(); S]|sKY
UINT nCount; rc<Ix
void SaveBmp(); d4ld-y
CCaptureDlg(CWnd* pParent = NULL); // standard constructor tKcC{
// Dialog Data G4P*U3&p
//{{AFX_DATA(CCaptureDlg) K1A<m=If
enum { IDD = IDD_CAPTURE_DIALOG }; tP*GYWI48
CComboBox m_Key; <2%9O;bV[
BOOL m_bControl; F[%k;aJ
BOOL m_bAlt; \P9ms?((A
BOOL m_bShift; `''y,{Fs
CString m_Path; }uC]o@/
CString m_Number; 3.hFYA w
//}}AFX_DATA ^BRqsVw9
// ClassWizard generated virtual function overrides mDZA\P_
//{{AFX_VIRTUAL(CCaptureDlg) r-xP6
public: lw}7kp4
2F
virtual BOOL PreTranslateMessage(MSG* pMsg); ER~RBzp
protected: k'N``.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S ~h*U2
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yocFdI
//}}AFX_VIRTUAL 4e
eh+T
// Implementation RXcN<Y&
protected: !G[%; d
HICON m_hIcon; \,X)!%6kZ
// Generated message map functions !9YCuHj!p
//{{AFX_MSG(CCaptureDlg) $ (xdF
virtual BOOL OnInitDialog(); 1 n&%L8]
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =Hn--DEMg
afx_msg void OnPaint(); /3^XJb$Sa
afx_msg HCURSOR OnQueryDragIcon(); iymN|KdpaZ
virtual void OnCancel(); :aaX Y:<
afx_msg void OnAbout(); |4
\2,M#
afx_msg void OnBrowse(); 4r~K`)/S'
afx_msg void OnChange(); yvzH}$!]
//}}AFX_MSG yp^k;G?_d
DECLARE_MESSAGE_MAP() Iy4%,8C]g
}; O $e"3^Pa
#endif EmrkaV-?k
LL
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////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .zt&HI.F
#include "stdafx.h" vk
X+{n
#include "Capture.h" ^xNzppz`]C
#include "CaptureDlg.h" 3h=kn@I
#include <windowsx.h> 6)?u8K5%r
#pragma comment(lib,"hook.lib") 7%? bl
#ifdef _DEBUG FvPWS!H
#define new DEBUG_NEW +swT MR
#undef THIS_FILE czu9a"M>X
static char THIS_FILE[] = __FILE__; SpU|Q1Q/h
#endif :Z2997@Y
#define IDM_SHELL WM_USER+1 @#N7M2/
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PWx%~U.8~j
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @MTv4eC}e
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @~|;/OY>"
class CAboutDlg : public CDialog X])iQyN
{ Nb
!i_@m%s
public: U?{oxy_[ 2
CAboutDlg(); Wu|MNB?M
// Dialog Data X"q[rsB
//{{AFX_DATA(CAboutDlg) /ILd|j(e
enum { IDD = IDD_ABOUTBOX }; 'NCqI
//}}AFX_DATA Gds(.]_
// ClassWizard generated virtual function overrides [?9 `x-Q
//{{AFX_VIRTUAL(CAboutDlg) }i^|.VZZ
protected: :2==7u7v?
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^t7u4w!
//}}AFX_VIRTUAL ]>Z9K@
// Implementation ||wi4TP
protected: BLaNS4e
//{{AFX_MSG(CAboutDlg) n-jPb064
//}}AFX_MSG ,vf#e=Z
DECLARE_MESSAGE_MAP() lkJxb~S
}; +jwk4BU
`|Di?4+6%
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #|Lsi`]+
{ *'A*!=5(
//{{AFX_DATA_INIT(CAboutDlg) c?_7e9}2
//}}AFX_DATA_INIT 1 /{~t[*.
} =Hd#"9-
sK+uwt
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6=$<R4B
{ vWESu4W`L
CDialog::DoDataExchange(pDX); Xy K,
//{{AFX_DATA_MAP(CAboutDlg) oNPvks dC;
//}}AFX_DATA_MAP F$
G)vskd
} %}zkmEY.e
hR7uAk_?
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l P=I0A-
//{{AFX_MSG_MAP(CAboutDlg) |T/OOIA=sI
// No message handlers c,;VnZ
9wC
//}}AFX_MSG_MAP +3-5\t`
END_MESSAGE_MAP() Wj|W B*B
jR[c3EA
;
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) uQdy
: CDialog(CCaptureDlg::IDD, pParent) ^ }5KM87
{ "PRHQW
//{{AFX_DATA_INIT(CCaptureDlg) %Y;^$%X%_
m_bControl = FALSE; Yu)GV7\2
m_bAlt = FALSE; @Z'i7Z
m_bShift = FALSE; A_U=`M=-
m_Path = _T("c:\\"); %regt{
m_Number = _T("0 picture captured."); WUz69o be
nCount=0; FqbGT(QB0
bRegistered=FALSE; srN7
bTray=FALSE; 8g_kZ^<[
//}}AFX_DATA_INIT g.`Ntsi$wI
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sBI/`dGZV
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); qQDe'f~
} 965 x_
%
svEe@Kt`
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?32~%?m
{ Myg;2 .
CDialog::DoDataExchange(pDX); g7hI9(8+
//{{AFX_DATA_MAP(CCaptureDlg) d{NMG)`x\
DDX_Control(pDX, IDC_KEY, m_Key); S
WTZ6(!oW
DDX_Check(pDX, IDC_CONTROL, m_bControl); %SIll
DDX_Check(pDX, IDC_ALT, m_bAlt); ?K2EK'-q
DDX_Check(pDX, IDC_SHIFT, m_bShift); t~K[`=G\ex
DDX_Text(pDX, IDC_PATH, m_Path); GEVDXx>@
DDX_Text(pDX, IDC_NUMBER, m_Number); 'do2n/
//}}AFX_DATA_MAP Uq'W<.v5
} S{e3aqT#N
9<3}zwJ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) dg#Pb@7a
//{{AFX_MSG_MAP(CCaptureDlg) C|Gk}
ON_WM_SYSCOMMAND() VV$#<D<)
ON_WM_PAINT() qvy*;
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ON_WM_QUERYDRAGICON() RiR],Sj
ON_BN_CLICKED(ID_ABOUT, OnAbout) Q~wS2f`)
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J`[jub
ON_BN_CLICKED(ID_CHANGE, OnChange)
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//}}AFX_MSG_MAP #P}n+w_@
END_MESSAGE_MAP() w$iPFZC'
:qj^RcmVPL
BOOL CCaptureDlg::OnInitDialog() ;Qt/(/
{ ](s5;ta
CDialog::OnInitDialog(); Wm"#"l4
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ALF21e*n
ASSERT(IDM_ABOUTBOX < 0xF000); '#=n>
CMenu* pSysMenu = GetSystemMenu(FALSE); EMr|#}]#s
if (pSysMenu != NULL) 1@'I eywg
{ {#?|&n<
CString strAboutMenu; a)r["*bTx
strAboutMenu.LoadString(IDS_ABOUTBOX); )XSHKPTQ1
if (!strAboutMenu.IsEmpty()) T&6>Eb0{
{ .Y7Kd+)s)L
pSysMenu->AppendMenu(MF_SEPARATOR); =BR+J9
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,!^c`_Q\>@
} I*>q7Hsu
} q~aj"GD
SetIcon(m_hIcon, TRUE); // Set big icon l}(HE+?
SetIcon(m_hIcon, FALSE); // Set small icon ; (}~m&p
m_Key.SetCurSel(0); lAo ~w
RegisterHotkey(); 7O|`\&RYR
CMenu* pMenu=GetSystemMenu(FALSE); F%lC%~-qh
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); f &NX~(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X)RgXl{
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5K?/-0yG
return TRUE; // return TRUE unless you set the focus to a control IOxtuR
} 5$:9nPAH
\5<Z [#{
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ->;2CcpHB
{ (AjgLNB
if ((nID & 0xFFF0) == IDM_ABOUTBOX) f0^s<:*
{ fsEQ4xN'
CAboutDlg dlgAbout; E6xdPjoWy
dlgAbout.DoModal(); p]y.N)a
} SfY 5Xgp
else G,<d;:
{ T3=h7a %=
CDialog::OnSysCommand(nID, lParam); !9r%d8!z
} H2[0@|<<
} fH9"sBiO
Ex]Ku
void CCaptureDlg::OnPaint() xuqG)HthRS
{ 4/*@cW
if (IsIconic()) |%XcI3@*
{ }JQy&V%
CPaintDC dc(this); // device context for painting %o\+R0K
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Mby4(M+&n
// Center icon in client rectangle uR2|> m
int cxIcon = GetSystemMetrics(SM_CXICON); ^uw]/H3?L
int cyIcon = GetSystemMetrics(SM_CYICON); eG2'W
CRect rect; s"$K2k;J
GetClientRect(&rect); 8"d??3ZXJ
int x = (rect.Width() - cxIcon + 1) / 2; kQ&Q_FSO
int y = (rect.Height() - cyIcon + 1) / 2; Z 369<
// Draw the icon G"(aoy,
co
dc.DrawIcon(x, y, m_hIcon); Hq>hnCT
} c]U+6JH
else YE*|KL^
{ 9o?\*{'KT
CDialog::OnPaint(); pQ^V<6z}
} ct,;V/Dx
} F}[!OYyg
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HCURSOR CCaptureDlg::OnQueryDragIcon() x_-V{
k
{ )@Y<
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return (HCURSOR) m_hIcon; \pI {b9
} nW\W<[O9
"|&3z/AUh
void CCaptureDlg::OnCancel() oXk6,b"
{ jvR(e"
if(bTray) UB8n,+R
DeleteIcon(); 8[AU`F8W
CDialog::OnCancel(); An?#B4:
} 2Rwd\e.z
`) ],FE*:
void CCaptureDlg::OnAbout() 2(\PsN w!
{ 6M_ W(
CAboutDlg dlg; 16@<G
dlg.DoModal(); &ZFHWI(P
} 6pC1C.
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void CCaptureDlg::OnBrowse() sL\ {.ad5
{ 2$t%2>1>@
CString str; @\oZ2sB
BROWSEINFO bi; <0~1
char name[MAX_PATH]; [%6)
ZeroMemory(&bi,sizeof(BROWSEINFO)); ?5};ONjN
bi.hwndOwner=GetSafeHwnd(); b-<@3N.9]
bi.pszDisplayName=name; a!u5}[{
bi.lpszTitle="Select folder"; T?Z^2.Pvc
bi.ulFlags=BIF_RETURNONLYFSDIRS; y|0/;SjV
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q*'OY~
if(idl==NULL) XMP4YWuVc
return; wm?%&V/#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));
- 3PLP$P
str.ReleaseBuffer(); {w"Cr0F,
m_Path=str; Tw*p^rU
if(str.GetAt(str.GetLength()-1)!='\\') t"J{qfNs
m_Path+="\\"; !:esdJH
UpdateData(FALSE); ~d\V>
} ",Mrdxn7
&0G9v
void CCaptureDlg::SaveBmp() 't*]6^
{ 8gt*`]I
CDC dc; [,ulz4"
dc.CreateDC("DISPLAY",NULL,NULL,NULL); glROT@
CBitmap bm; 8*B+@`
int Width=GetSystemMetrics(SM_CXSCREEN); *6=9 8C4I
int Height=GetSystemMetrics(SM_CYSCREEN); c(5XT[Tw
bm.CreateCompatibleBitmap(&dc,Width,Height); Fe:
~M?]
CDC tdc; p_JWklg^
tdc.CreateCompatibleDC(&dc); `*kl> }$
CBitmap*pOld=tdc.SelectObject(&bm); fshG ~L7S9
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [Ne'2z
tdc.SelectObject(pOld); 8s[1-l
BITMAP btm; bd27])n(
bm.GetBitmap(&btm); PVljb=8F
DWORD size=btm.bmWidthBytes*btm.bmHeight; BOy&3.h5?
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7D'D7=Z.
BITMAPINFOHEADER bih; *0V'rH)
bih.biBitCount=btm.bmBitsPixel; eq&QWxiD*
bih.biClrImportant=0; R(P(G;#j
bih.biClrUsed=0; MI:%Eq
bih.biCompression=0; ouFKqRs;
bih.biHeight=btm.bmHeight; Ix@B*Xz:`
bih.biPlanes=1; BYa#<jXtAT
bih.biSize=sizeof(BITMAPINFOHEADER); 4Xt`L"f
bih.biSizeImage=size; 6zNWDUf
bih.biWidth=btm.bmWidth; :kwDa
a
bih.biXPelsPerMeter=0; C"s-ttP
bih.biYPelsPerMeter=0; vo&h6'i>7
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); f:~$x
static int filecount=0; R1%J6wZq
CString name; !su773vo
name.Format("pict%04d.bmp",filecount++); t6\--lk_
name=m_Path+name; m9&%A0
BITMAPFILEHEADER bfh; mV4gw'.;7
bfh.bfReserved1=bfh.bfReserved2=0; P7/Xh3
bfh.bfType=((WORD)('M'<< 8)|'B'); E?BF8t_fTE
bfh.bfSize=54+size; E:PPb9Kd
bfh.bfOffBits=54; OP-{76vE&b
CFile bf; \6"=`H0}
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +bJ~S:[
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #,XZ @u+
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); a{rUk%x
bf.WriteHuge(lpData,size); J}#2Wy^{
bf.Close(); MpJ<. |h
nCount++; q6>}
} }? c%L8\
GlobalFreePtr(lpData); HPt\ BK
if(nCount==1) bs16G3-p
m_Number.Format("%d picture captured.",nCount); 'Yc^9;C(
else hH%fWB2(
m_Number.Format("%d pictures captured.",nCount); fZ;}_wR-H
UpdateData(FALSE); >dD$GD{
} n'JS-
8_S| 8RW(
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .j**>&7L
{ elpTak@
if(pMsg -> message == WM_KEYDOWN) +Kg }R5+
{ BD86t[${W
if(pMsg -> wParam == VK_ESCAPE) asLrXGGyT
return TRUE; `P*BW,P'T
if(pMsg -> wParam == VK_RETURN) |90X_6(
return TRUE; du#f_|xG
} [/ertB
return CDialog::PreTranslateMessage(pMsg); y}|E)
} owVks-/
$%
gz ,{
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) . n)R@&9
{ ue'dI
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Z'}%Mkm`i}
SaveBmp(); ozl!vf# kv
return FALSE; ;vX1U8
}
M}@>h
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .c__T{<)[
CMenu pop; d\JBjT1g
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S'NLj(
CMenu*pMenu=pop.GetSubMenu(0); ]IeLKcn
pMenu->SetDefaultItem(ID_EXITICON); gMkSl8[
CPoint pt; V
d]7v
GetCursorPos(&pt); |GsMLY:0
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M_2>b:#A*
if(id==ID_EXITICON) "Ehh9 m1&
DeleteIcon(); DBLM0*B
else if(id==ID_EXIT) zpeCT3Q5O
OnCancel(); d~h;|Bl[
return FALSE; pLV
%g#h
} gG}H5uN
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M7 kWJ
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a)Pr&9I
AddIcon(); ;Bzx}7A
return res; *rHz/& ,
} _9p79S<+
d"Wuu1tEY
void CCaptureDlg::AddIcon() NuUiW*|`7
{ z1^fG)
NOTIFYICONDATA data; Cg`lQYU
data.cbSize=sizeof(NOTIFYICONDATA); 7l~^KsX
CString tip; *,*O.#<6
tip.LoadString(IDS_ICONTIP); ~kSOYvK$'
data.hIcon=GetIcon(0); t*A[v
data.hWnd=GetSafeHwnd(); "bWx<
strcpy(data.szTip,tip); lQvgq
data.uCallbackMessage=IDM_SHELL; T:H~Y+qnt
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9&`";dg
data.uID=98; S7#dyAX8
Shell_NotifyIcon(NIM_ADD,&data); j|N<6GSke
ShowWindow(SW_HIDE); a l6y=;\jZ
bTray=TRUE; [C<K~
} M* Ej*#
"+wkruC
void CCaptureDlg::DeleteIcon() _2{_W9k
{ / #rH18
NOTIFYICONDATA data; h{$k%YJ?
data.cbSize=sizeof(NOTIFYICONDATA); 0( A ?&
data.hWnd=GetSafeHwnd(); TJZ~Rpq
data.uID=98; ]*lZFP~
Shell_NotifyIcon(NIM_DELETE,&data); [6_.Y*}N
ShowWindow(SW_SHOW); .P")S|
SetForegroundWindow(); YhfQpe
ShowWindow(SW_SHOWNORMAL); 4 dLnX3 v
bTray=FALSE; q5'G]j{,Z
} pPo(nH|<
llWY7u"
void CCaptureDlg::OnChange() 1EC;t1.7
{ HuU$x;~
RegisterHotkey(); z\"
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} tY!l}:E[
']+!i a
BOOL CCaptureDlg::RegisterHotkey() J[hmY= ,
{ 'g'RXC}D>
UpdateData(); c_M[>#`
UCHAR mask=0; jWi~Q o+
UCHAR key=0; gTOx|bx
if(m_bControl) m6$&yKQ-=h
mask|=4; "e8EA!Ipte
if(m_bAlt) :D-D+x
mask|=2; #W3H;'~/5
if(m_bShift) _od /)#
mask|=1; 5y\35kT'
key=Key_Table[m_Key.GetCurSel()]; 7Hgn/b[?b
if(bRegistered){ 7
@}`1>97
DeleteHotkey(GetSafeHwnd(),cKey,cMask); q9j~|GE|
bRegistered=FALSE; Dykh|"
} f5b|,JJ
cMask=mask; I9>vm]
cKey=key; &0%Zb~ts
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); dzAumWoh
return bRegistered; SG|AJ9
} \ERxr
F8{gJaP x
四、小结 ]sL.+.P
Y;huTZ
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。