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:
-O-qEQd
1Q ^YaHzuW 一、实现方法
uZ(j"y vQpR0IEf]e 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:
:D'#CoBA `Vqpo/ #pragma data_seg("shareddata")
Q}MS $[y HHOOK hHook =NULL; //钩子句柄
51k^?5cO UINT nHookCount =0; //挂接的程序数目
F!;0eS"xp static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
|Skk1# static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
5B'};AQ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
yprf
`D> static int KeyCount =0;
tj_+0J$sw: static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
`9
#pragma data_seg()
k~st;FO w3=Bj 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。
OO:^#Mvv5 v"6ijk&( 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:
eSgCS*}0$z .iB?: BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
.V?i 3 cKey,UCHAR cMask)
`% x6;Ha {
:+SpZ> BOOL bAdded=FALSE;
&T8prE? for(int index=0;index<MAX_KEY;index++){
\HB4ikl if(hCallWnd[index]==0){
1cyX9X hCallWnd[index]=hWnd;
/M-%]sayj HotKey[index]=cKey;
Jy x6{Oj HotKeyMask[index]=cMask;
4#z@B1Jx bAdded=TRUE;
nKJJ7 RL KeyCount++;
uYPdmrPB?l break;
bX:ARe
O }
y+XB }
.`OdnLGy return bAdded;
I
=t{ u; }
0~\Dd0W/:` //删除热键
9@-^!DBM BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|"Js iT {
&\$l%icuo BOOL bRemoved=FALSE;
=yfLqU for(int index=0;index<MAX_KEY;index++){
%jK-}0Tu if(hCallWnd[index]==hWnd){
i`^`^Ka if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
wPDA_ns~ hCallWnd[index]=NULL;
)hHkaI>eYv HotKey[index]=0;
(N U*PQY6 HotKeyMask[index]=0;
F(8>"(C bRemoved=TRUE;
L!7*U.+ KeyCount--;
lbv9 kk[ break;
Y)>GwFK$ }
a r#p7N }
xFpMn}CD }
;2vHdN return bRemoved;
;K:)R_H }
aZYa<28?L% dE*n!@ =>Vo|LBoe DLL中的钩子函数如下:
)POuH*j
`?Yh`P0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ldo7}<s {
iNR6BP
W BOOL bProcessed=FALSE;
bmEo5f~C! if(HC_ACTION==nCode)
{|%N {
%v\0Dm+A if((lParam&0xc0000000)==0xc0000000){// 有键松开
A-O@e
e switch(wParam)
U3 e3 {
*f:^6h case VK_MENU:
bmotR8d MaskBits&=~ALTBIT;
M$z.S0" break;
&j,rq?eh$ case VK_CONTROL:
F7`3,SzHp MaskBits&=~CTRLBIT;
Gw*n,*pz break;
:0.Z/s - case VK_SHIFT:
e g#.f` MaskBits&=~SHIFTBIT;
u0^:
XwZ! break;
|~bl%g8xP default: //judge the key and send message
#N%xr'H break;
[Z484dS`_ }
kScq#<Y& for(int index=0;index<MAX_KEY;index++){
#J]u3*Tn| if(hCallWnd[index]==NULL)
]&1Kz
2/ continue;
y88FT#hR|5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZD] ^Y} {
EZz Ox(g SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"_JGe#= bProcessed=TRUE;
aE6I|6W? }
V+X>t7.Q }
2JZf@x+} }
.N8AkQ(Ok else if((lParam&0xc000ffff)==1){ //有键按下
<jT6|2' switch(wParam)
K*Zf^g
m {
k7Fa+Y)K7 case VK_MENU:
~#dNGWwG MaskBits|=ALTBIT;
LQ"56PP< break;
*ta
``q case VK_CONTROL:
NIeT.! MaskBits|=CTRLBIT;
[rv"tz= break;
E)m{m$Hb case VK_SHIFT:
{[PoLOCI MaskBits|=SHIFTBIT;
D[m;rcl break;
Ns2M8 default: //judge the key and send message
>&tPIrz break;
V<AT"vU[ }
3qPj+@ for(int index=0;index<MAX_KEY;index++){
GFOd9=[ if(hCallWnd[index]==NULL)
!@!,7te continue;
0&Q-y&$7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Mf%0Cx ` {
v`MCV29!} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.oYUA} bProcessed=TRUE;
Fd-PjW/E8 }
v2:A 4Pd:+ }
Y@N}XH<4R }
(7q!Z!2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
}3F8[Td.~N for(int index=0;index<MAX_KEY;index++){
FyX\S= if(hCallWnd[index]==NULL)
4mJ4) continue;
~`c?&YixU if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+~\1Zgw SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
<<gk<_7` //lParam的意义可看MSDN中WM_KEYDOWN部分
YYHtd,0\+ }
;1&%Wj"d }
CN@bJo2 }
&Vfdq6Y] return CallNextHookEx( hHook, nCode, wParam, lParam );
4[|^78 }
~U#afGH$ AzVON#rj 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:
k DS G=!1P]M{ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Zf}]sW$H BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
6Yebc_, R C3Q[L}X\ 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:
*z;4.
OX W}bed],l LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Vo<V!G{ {
tvynl;Y/ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Juj"cjob {
-l<b|`s=w. //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
a:Jsi= SaveBmp();
PI(;t9]b return FALSE;
qz"di~ 7 }
e )l<D) …… //其它处理及默认处理
.w\AyXp }
+0\BI<aG ]7n+|@3x okJ+Yl.[?7 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。
XRCiv xtYX}u 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。
c1M/:*?% L5!aLv# 二、编程步骤
R9nW5f
Nf ik)T>rYg0 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";
ya3A^&: ^{nf0 )56c 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
0gw0 B)g7MG 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;
js)M
c*]& /)Bk
r/ 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;
DZ -5A S/)P&V% 5、 添加代码,编译运行程序。
|oPCmsO3R{ P:vAU8d> 三、程序代码
{/G~HoY1i yEyx.Mh.Af ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
4;'o`K~* #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<QFT>#@T #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
}.ZX.qYX #if _MSC_VER > 1000
%!I7tR#; #pragma once
Gs;wx_k^ #endif // _MSC_VER > 1000
.dX ^3 #ifndef __AFXWIN_H__
hAtf) #error include 'stdafx.h' before including this file for PCH
b?eIFI&w^l #endif
;QkUW<( #include "resource.h" // main symbols
"n3r, class CHookApp : public CWinApp
=B@+[b0Z {
3:Q5dr+1_ public:
:["iBrFp CHookApp();
OjTb2[Q // Overrides
|l)SX\Qf`@ // ClassWizard generated virtual function overrides
_SdO}AiG //{{AFX_VIRTUAL(CHookApp)
HZC^Q7]hy public:
~``oKiPg@ virtual BOOL InitInstance();
=V~pQbZ virtual int ExitInstance();
6U5L>sQ //}}AFX_VIRTUAL
7p*PDoM6` //{{AFX_MSG(CHookApp)
VA+
?xk // NOTE - the ClassWizard will add and remove member functions here.
V:HxRMF2X // DO NOT EDIT what you see in these blocks of generated code !
&7_xr.c7 //}}AFX_MSG
/ r6^]grg DECLARE_MESSAGE_MAP()
#&<>|m };
r:0F("},
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
wb~BY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
b>SG5EqU@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
TtTp,If BOOL InitHotkey();
5<ZE.'O BOOL UnInit();
&{E1w<uv #endif
koDIxj'%X x6Zhw9RV //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
v&Xsyb0CaM #include "stdafx.h"
8AL`<8$ #include "hook.h"
BUB$k7{z #include <windowsx.h>
Ug(;\*yg #ifdef _DEBUG
}2c)UQD8 #define new DEBUG_NEW
WjLy7& #undef THIS_FILE
MYNNeO static char THIS_FILE[] = __FILE__;
VwJ A #endif
DmzK* O{ #define MAX_KEY 100
mY6d+ #define CTRLBIT 0x04
SQ&nQzL #define ALTBIT 0x02
<&JK5$l<X #define SHIFTBIT 0x01
&%eWCe++ #pragma data_seg("shareddata")
@GTkS!86 HHOOK hHook =NULL;
+I~`Ob UINT nHookCount =0;
Lv;% z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
b)ytm=7ha static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
^#-d^ )f; static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
4z6i{n-k static int KeyCount =0;
_v=S4A#tF static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
k*XI/k5Vc #pragma data_seg()
9~3;upWu! HINSTANCE hins;
W^dk: void VerifyWindow();
24{Tl
q3 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
-DAkVFsN //{{AFX_MSG_MAP(CHookApp)
uBpnfIe // NOTE - the ClassWizard will add and remove mapping macros here.
@ ;T|`Y=7 // DO NOT EDIT what you see in these blocks of generated code!
b0X<)1O //}}AFX_MSG_MAP
b;Nm$`2 END_MESSAGE_MAP()
U-^qVlw vVvx g0 CHookApp::CHookApp()
_{Z!$q6, {
`Xs3^FJt // TODO: add construction code here,
a
]~Rp // Place all significant initialization in InitInstance
]'IZ bx: }
bsClw P ?^h CHookApp theApp;
SXqWq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
FR*CiaD1 {
&~4;HjS BOOL bProcessed=FALSE;
}+mIP:T if(HC_ACTION==nCode)
#BPJRNXd {
eR1SPS1+ if((lParam&0xc0000000)==0xc0000000){// Key up
,s ` y switch(wParam)
Z%&$_-yJ {
sF. oZ> case VK_MENU:
\NZ(Xk MaskBits&=~ALTBIT;
"Yp:{e break;
%<dvdIB case VK_CONTROL:
TEJn;D<1I, MaskBits&=~CTRLBIT;
2uSXC*Phz break;
c/Dk*.xy< case VK_SHIFT:
O$eNG$7 MaskBits&=~SHIFTBIT;
)wZ;}O break;
L<D<3g|4 default: //judge the key and send message
Ga<Uvr%+ break;
Ow"e3]}Mt }
}>93X0%r for(int index=0;index<MAX_KEY;index++){
d9=i{i3 if(hCallWnd[index]==NULL)
r~[Bzw"c continue;
nu(;yIRP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7!qO*r {
xdLMy#U2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
()}(3>O- bProcessed=TRUE;
pH9xyN[:a }
isBtJ7 \Sc }
*;ehSg9 }
xF8U )j! else if((lParam&0xc000ffff)==1){ //Key down
d/&W[jJ switch(wParam)
\=1$$EDS9 {
s!IX3rz case VK_MENU:
APgjT';P^ MaskBits|=ALTBIT;
B3^F
$6= break;
T0;8koj^_ case VK_CONTROL:
%~e+H| MaskBits|=CTRLBIT;
Q6 oM$qiM break;
0-P,zkK_v case VK_SHIFT:
g)Tr# MaskBits|=SHIFTBIT;
REg&[e+% break;
n[KL Y! default: //judge the key and send message
1G'D' break;
IgIM8"N }
tFEY8ut{ for(int index=0;index<MAX_KEY;index++)
OH
>#f6`[ {
A:$4cacu9 if(hCallWnd[index]==NULL)
V|{\8&2 continue;
P.y06^
X}A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4j1$1C{ {
Wa5B;X~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
eS: 8Pn bProcessed=TRUE;
\; voBU }
eae `#>XP }
$xU)t&Df }
\<aR^Sj. if(!bProcessed){
<rihi:4K for(int index=0;index<MAX_KEY;index++){
f&L3M)T if(hCallWnd[index]==NULL)
RW`j^q,c3 continue;
FoQy@GnM5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
h`n)
b SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
JT p+&NS }
,+4*\yI3l }
%y{'p: }
Q 2>o+G return CallNextHookEx( hHook, nCode, wParam, lParam );
Nov)'2g7G }
*t{^P*pc 5O%?J-Hp BOOL InitHotkey()
f6,?Yex8B {
29HyeLB@ if(hHook!=NULL){
F~$ay@g nHookCount++;
-Hh.8(!XoO return TRUE;
gy`WBg(7x }
GYt|[GC else
)61X,z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
/ q| o if(hHook!=NULL)
h'nXV{N0 nHookCount++;
8B`w!@hf return (hHook!=NULL);
<y=+Gh }
,p>@:C/M BOOL UnInit()
0z$::p$%u {
hHk9O? if(nHookCount>1){
ElA(1o|9I nHookCount--;
9i46u20 return TRUE;
5{xK&[wR* }
DJZ$M BOOL unhooked = UnhookWindowsHookEx(hHook);
R $@$ if(unhooked==TRUE){
"-Yj~ nHookCount=0;
QuIZpP= hHook=NULL;
[X 9zrGHt }
g/4ipcG;N return unhooked;
\ZtKaEXnx }
3wMnTT"At Mi} . BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
n%6ba77 {
4-?zW BOOL bAdded=FALSE;
^kK% 8 u for(int index=0;index<MAX_KEY;index++){
@\WeI"^F8 if(hCallWnd[index]==0){
||))gI`3a hCallWnd[index]=hWnd;
#}lWM%9Dy HotKey[index]=cKey;
|s,y/svp HotKeyMask[index]=cMask;
K: |-s4= bAdded=TRUE;
h])oo:u'/Q KeyCount++;
-%dBZW\u2 break;
DB+oCE<.# }
bao"iv~z }
FeNNzV= return bAdded;
qfX26<q }
"QvTn= N F,<^ u BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CiV^bYi {
^ib
=fLu BOOL bRemoved=FALSE;
mqtYny' for(int index=0;index<MAX_KEY;index++){
&3OV|ly] if(hCallWnd[index]==hWnd){
R;zf x/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
uO)vGzt3^x hCallWnd[index]=NULL;
2;K2|G7 HotKey[index]=0;
Jflm-Hhsf HotKeyMask[index]=0;
J|w%n5Y bRemoved=TRUE;
8O_yZ
~Z4 KeyCount--;
Us.k, break;
Ae%AG@L }
_\gCdNrD }
@*E=O | }
Sf*gAwnW return bRemoved;
Q
ZC\%X8j }
(^"2"[?a lPD&Doa void VerifyWindow()
y'!"GrbZ {
uvAJJIae' for(int i=0;i<MAX_KEY;i++){
DkSs^ym if(hCallWnd
!=NULL){ uu.}<VM.1
if(!IsWindow(hCallWnd)){ ?r{hrAx
hCallWnd=NULL; sDY+J(Z
HotKey=0; 4Y{;%;-i
HotKeyMask=0; [C\B2iU7_M
KeyCount--; g;Zy3
} kA> e*6
} LLKYc y
} ^H -a@QM
} gquvVj1oT
,pY:kQ
BOOL CHookApp::InitInstance() G^';9 UK
{ EywBT
AFX_MANAGE_STATE(AfxGetStaticModuleState()); '
&3,qT
hins=AfxGetInstanceHandle(); wD:2sri
InitHotkey(); :cf#Tpq"
return CWinApp::InitInstance(); r@}8TE*|P
} FU(2,Vl
Bg] %
int CHookApp::ExitInstance() Ylyk/
{ gZiwXb
VerifyWindow(); X:lStO#5
UnInit(); RL)~J4Y
return CWinApp::ExitInstance(); 8rjD1<
} tyWDa$u,u
d0i|^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file &KY!a0s
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) a;v4R[lQ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F+ 7*SImv6
#if _MSC_VER > 1000 $fBj}\o
#pragma once M~n./wyC
#endif // _MSC_VER > 1000 $wn0oIuW
[k0/ZfFwV
class CCaptureDlg : public CDialog vvu $8n
{ M ziOpraj
// Construction f-634KuP
public: &E1m{gB(
BOOL bTray; Y;'SD{On
BOOL bRegistered; $}'(%\7"
BOOL RegisterHotkey(); Zu<S<??Jf
UCHAR cKey; -w>ss&
UCHAR cMask; d"n"A?nXh
void DeleteIcon(); (tX)r4VU
void AddIcon(); 0yvp>{;p
UINT nCount; :wN!E{0j
void SaveBmp(); 1Vx5tOq
CCaptureDlg(CWnd* pParent = NULL); // standard constructor D1$ER>
// Dialog Data
Bnk'
//{{AFX_DATA(CCaptureDlg) >t<\zC|~w
enum { IDD = IDD_CAPTURE_DIALOG }; C,A/29R,s
CComboBox m_Key; w0+X;aId
BOOL m_bControl; E N CWOj
BOOL m_bAlt; T--%UZD]W
BOOL m_bShift; CUHT5J*sY
CString m_Path; "Zx<hL*
CString m_Number; `23][V
//}}AFX_DATA ~A1!!rJX
// ClassWizard generated virtual function overrides aj,o<J
//{{AFX_VIRTUAL(CCaptureDlg) 1;DRcVyS+
public: V#b=mp
virtual BOOL PreTranslateMessage(MSG* pMsg); B^]PKjLNZ
protected: ;TS%e[lFhQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #vhN$H :&q
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); N|Ag8/2A
//}}AFX_VIRTUAL Nd+1r|e'
// Implementation GKjtX?~1
protected: /%s:aO
HICON m_hIcon; r/HCWs|
// Generated message map functions x(xi%?G
//{{AFX_MSG(CCaptureDlg) `R>z{-@=
virtual BOOL OnInitDialog(); KQvSeH>r
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~**x_ v
afx_msg void OnPaint(); K[
[6A:
afx_msg HCURSOR OnQueryDragIcon(); C\aHr!
virtual void OnCancel(); vf$IF|
afx_msg void OnAbout(); +iFt)
afx_msg void OnBrowse(); |
oK9o6m4
afx_msg void OnChange(); Aq*?Q/pV
//}}AFX_MSG :e nR8MS
DECLARE_MESSAGE_MAP() @K+gh#
}; uo J0wG.
#endif f$6N
h6OQeZ.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file zA8@'`Id
#include "stdafx.h" wpN3-D
#include "Capture.h" fISK3t/=C
#include "CaptureDlg.h" _ilitwRN3
#include <windowsx.h> UAT\ .
#pragma comment(lib,"hook.lib") lgS7;
#ifdef _DEBUG 1Y J?Y
#define new DEBUG_NEW biU_ImJ>0
#undef THIS_FILE |Tc4a4 jS
static char THIS_FILE[] = __FILE__; zL9~gJ
#endif 9Li*L&B)
#define IDM_SHELL WM_USER+1 =>B"j`oR
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w$AR
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Eu:/U*j
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; mO]>]
class CAboutDlg : public CDialog ZJQFn
{ 1}c'UEr%)
public: gwQMy$
CAboutDlg(); iB"ji4[z
// Dialog Data abm 3q!a-
//{{AFX_DATA(CAboutDlg) Um6}h@>
enum { IDD = IDD_ABOUTBOX }; d1/9
A-{
//}}AFX_DATA @ci..::5
// ClassWizard generated virtual function overrides BWy-R6br
//{{AFX_VIRTUAL(CAboutDlg) X-_VuM_p
protected: l>b'b e9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ruvfp_:
//}}AFX_VIRTUAL R-9o3TPa
// Implementation m7g*zu2#
protected: GT)7VF rL
//{{AFX_MSG(CAboutDlg) N`,\1hHMT
//}}AFX_MSG ;Tp9)UP)
DECLARE_MESSAGE_MAP() `6J7c;:
}; (lVMy\
0bM_EC
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %" 7UYLX
{ }O
$]xB
//{{AFX_DATA_INIT(CAboutDlg) y|KQ`;
//}}AFX_DATA_INIT {yWL|:#K
} rMi\#[oB
v-d"dC`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) SFd_k9
{ c8"Qmy
CDialog::DoDataExchange(pDX); GT6i9*tb#
//{{AFX_DATA_MAP(CAboutDlg) -5+Yz9pv[
//}}AFX_DATA_MAP 1' U
} *2->>"kh
?L7DVwVa,I
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2=n`z)R
//{{AFX_MSG_MAP(CAboutDlg) 3PZ(Kn<
// No message handlers 1h?ve,$
//}}AFX_MSG_MAP U364'O8_
END_MESSAGE_MAP() m^!j)\sM5
ufIvvZ*
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Cj-&L<
: CDialog(CCaptureDlg::IDD, pParent) 1:](=%oM&k
{ x@Z{5w_a
//{{AFX_DATA_INIT(CCaptureDlg) g^(gT
m_bControl = FALSE; Q|h$D~
m_bAlt = FALSE; zpT^:Ag
m_bShift = FALSE; n19A>,m
m_Path = _T("c:\\"); GHd1?$
m_Number = _T("0 picture captured.");
^ExuIe
nCount=0; hE5?G;
bRegistered=FALSE; } SWp~3P
bTray=FALSE; 6,q_M(;c
//}}AFX_DATA_INIT 7;AK=;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 I V#8W
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UtTlJb{-j
} CU\gx*=E
{%u^O/M
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `x/i1^/_@
{ x>Q% hl
CDialog::DoDataExchange(pDX); 'Xj^cX
//{{AFX_DATA_MAP(CCaptureDlg) [;Lgbgt3f
DDX_Control(pDX, IDC_KEY, m_Key); V&:x+swt
DDX_Check(pDX, IDC_CONTROL, m_bControl); /qy6YF8;y
DDX_Check(pDX, IDC_ALT, m_bAlt); m\XsU?SuX
DDX_Check(pDX, IDC_SHIFT, m_bShift); ygIn6.p
DDX_Text(pDX, IDC_PATH, m_Path); .ZF%$H
DDX_Text(pDX, IDC_NUMBER, m_Number); M' z.d
//}}AFX_DATA_MAP g^+p7G
} LxhS
9
ajk}&`Wj"
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) B2Y.1mXq
//{{AFX_MSG_MAP(CCaptureDlg) NL$z4m0
ON_WM_SYSCOMMAND() }k-8PG =
ON_WM_PAINT() ^rO"U[To
ON_WM_QUERYDRAGICON() E#:!&{O
ON_BN_CLICKED(ID_ABOUT, OnAbout) = EFh*sp
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _MTZuhY
ON_BN_CLICKED(ID_CHANGE, OnChange) L7buY(F(
//}}AFX_MSG_MAP \]f+{d-&
END_MESSAGE_MAP() j AOy3c
dv\bkDF4A
BOOL CCaptureDlg::OnInitDialog() 1gkpK`u(B
{ 1m"WrTen
CDialog::OnInitDialog(); g{6jN
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (JlPe)Q5
ASSERT(IDM_ABOUTBOX < 0xF000); ]VKQm(,0
CMenu* pSysMenu = GetSystemMenu(FALSE); Ut\:jV=f
if (pSysMenu != NULL) A/I\MN|
{ 0l[52eZ/
CString strAboutMenu; 4vWiOcJF!O
strAboutMenu.LoadString(IDS_ABOUTBOX); PB$beQ
if (!strAboutMenu.IsEmpty()) !;,\HvEZYw
{ O)vGIp?f't
pSysMenu->AppendMenu(MF_SEPARATOR); 8bdO-LJ9
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R&.&x'<
} 02t({>`
} 4;Ucas6
SetIcon(m_hIcon, TRUE); // Set big icon _-y1>{]H
SetIcon(m_hIcon, FALSE); // Set small icon TYGI
f4z
m_Key.SetCurSel(0); SXqB<j$.;
RegisterHotkey(); /i>n1>~yn
CMenu* pMenu=GetSystemMenu(FALSE); V /2NIh
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); '[liZCg
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CdRJ@Lf
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?s$d("~
return TRUE; // return TRUE unless you set the focus to a control 6WZffB{-TK
} -V6caVlg
ca7Y+9<
;
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) EQ~<NzRp=
{ e`g+Jf`AT
if ((nID & 0xFFF0) == IDM_ABOUTBOX) y@~ VE5N
{ MZQDFuvDxZ
CAboutDlg dlgAbout; W.[!Q`
dlgAbout.DoModal(); g&y (-
} u*2?Gky
else zO"De~[9
{ S:j{R^$k
CDialog::OnSysCommand(nID, lParam); %P s.r{%{
} Vq]ixag2^
} i;9X_?QF
H%Gz"
void CCaptureDlg::OnPaint() cdL]s^z
{ /g+-{+sx
if (IsIconic()) |3e+ K.
{ l%_K$$C
CPaintDC dc(this); // device context for painting $aJ6i7C,j}
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L$_%T
// Center icon in client rectangle 3f^Pr
int cxIcon = GetSystemMetrics(SM_CXICON); \h=*pAf
int cyIcon = GetSystemMetrics(SM_CYICON); vq(#Ih2
CRect rect; L#K`F8Wi=
GetClientRect(&rect); vx($o9
int x = (rect.Width() - cxIcon + 1) / 2; XjL3Ar*
int y = (rect.Height() - cyIcon + 1) / 2; i%.NP;Qq]M
// Draw the icon =9ff983
dc.DrawIcon(x, y, m_hIcon); $?W2'Xm!V
} [G$ #jUt/O
else Rmmu#-{Y
{ 4t(/F`
CDialog::OnPaint(); hH5~T5?\
} f}2}Ta
} 7!cLTq
\_,p@r]Q
HCURSOR CCaptureDlg::OnQueryDragIcon() TSewq4`K
{ V5ZC2H
return (HCURSOR) m_hIcon; I9G^T' W
} tIDN~[1
:2nsi4
void CCaptureDlg::OnCancel() vwu/33
{ *V',@NH#Os
if(bTray) ni{'V4A
DeleteIcon(); V:y6NfL7i'
CDialog::OnCancel(); ,V!"4T,Z
} 7u&l]NC?y
f:+/=MW
void CCaptureDlg::OnAbout() uc+{<E3,%
{ q]OIP"yv
CAboutDlg dlg; }ZVond$y4
dlg.DoModal(); b)'CP Cu*
} eg/itty
].xSX0YQ%
void CCaptureDlg::OnBrowse() Hj
r'C?[
{ /jJD
{
CString str; 'k\j[fk/K
BROWSEINFO bi; ?&wrz
char name[MAX_PATH]; R&(OWF;~,
ZeroMemory(&bi,sizeof(BROWSEINFO)); WcqR; Nm
bi.hwndOwner=GetSafeHwnd(); $Ah
p4oiE
bi.pszDisplayName=name; \54B
bi.lpszTitle="Select folder"; &Iy5@8
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9pnOAM}
LPITEMIDLIST idl=SHBrowseForFolder(&bi); s9sl*1n1m`
if(idl==NULL) FtyT:=Kpc
return; |#o' =whTl
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VB*c1i
str.ReleaseBuffer(); }UsH#!9.
m_Path=str; %pq.fZI
if(str.GetAt(str.GetLength()-1)!='\\') G?$o+Y'F
m_Path+="\\"; ^L$`)Ja
UpdateData(FALSE); Ty&1R?
} YSGE@
hQx*#:ns
void CCaptureDlg::SaveBmp() +'gO%^{l
{ BkB_?^Nv8
CDC dc; M}[Q2v\
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Rs"=o>Qu
CBitmap bm; 6agG*x
int Width=GetSystemMetrics(SM_CXSCREEN); 8a8a:d
int Height=GetSystemMetrics(SM_CYSCREEN); k@lJ8(i^qU
bm.CreateCompatibleBitmap(&dc,Width,Height); SeXgBbGAne
CDC tdc; 9Zl4NV&B
tdc.CreateCompatibleDC(&dc); ;6PU
CBitmap*pOld=tdc.SelectObject(&bm); VI4mEq,V
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c>D~MCNxg
tdc.SelectObject(pOld); u=InE|SH
BITMAP btm; ;&J>a8B$
bm.GetBitmap(&btm); >xo<i8<Miv
DWORD size=btm.bmWidthBytes*btm.bmHeight; 1 jB0gNe
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dj(&"P
BITMAPINFOHEADER bih; VC/n}7p
bih.biBitCount=btm.bmBitsPixel; *Lrrl
bih.biClrImportant=0; 4dFr~ {
bih.biClrUsed=0; 79>x/jZka
bih.biCompression=0; ?aTH<
bih.biHeight=btm.bmHeight; nD/B:0'
bih.biPlanes=1; 5PeYQ-B|
bih.biSize=sizeof(BITMAPINFOHEADER); WMC^G2 n
bih.biSizeImage=size; 3_
J'+
bih.biWidth=btm.bmWidth; p3 5)K5V
bih.biXPelsPerMeter=0; _@>*]g
bih.biYPelsPerMeter=0; j}.gK6Yq*
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Uzvd*>mv
static int filecount=0; el5Pe{j'
CString name; ^V; r
name.Format("pict%04d.bmp",filecount++); %!Eh9C*
name=m_Path+name; d)uuA;n
BITMAPFILEHEADER bfh; a({Rb?b
bfh.bfReserved1=bfh.bfReserved2=0; wwdmz;0S
bfh.bfType=((WORD)('M'<< 8)|'B'); kIS )*_
bfh.bfSize=54+size; l=XZBe*[g'
bfh.bfOffBits=54; %%X/gvaJ
CFile bf; ,X_3#!y
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ d>F7i~W
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;/+< N
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [/hoNCH!
bf.WriteHuge(lpData,size); zu?112-v2
bf.Close(); -x6_HibbD
nCount++; LI}e_=E
} )2y [#Blo
GlobalFreePtr(lpData); !U@ETo
if(nCount==1) sT1OAK\^
m_Number.Format("%d picture captured.",nCount); U3Gg:onuE
else [\Wl~
a l
m_Number.Format("%d pictures captured.",nCount); moFrNcso
UpdateData(FALSE); Jk}3c>^D
} cG0)F%?X?
^NU_Tp:2^
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \,NT5>
{ ]p+KN>1e
if(pMsg -> message == WM_KEYDOWN) X_X7fRC0
{ gHp4q!SJ7
if(pMsg -> wParam == VK_ESCAPE) <fBJ@>
return TRUE; tBzE(vW
if(pMsg -> wParam == VK_RETURN) [K
#$W
return TRUE; XO?WxL9k]
} +?6]Vu&|f
return CDialog::PreTranslateMessage(pMsg); SPb`Q"
} g~21|Sa$[
pSQ2wjps
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qdk!.A{
{ c(Y~5A{TXO
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m
%+'St|qr
SaveBmp(); qh>An;:u
return FALSE; 4IZAJqw(*
} _s#J\!F
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @dK_w'W
CMenu pop; lW-G]V
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A
,0}bFK
CMenu*pMenu=pop.GetSubMenu(0); 'g<{l&u
pMenu->SetDefaultItem(ID_EXITICON); [r7Hcb
CPoint pt; n,2 p)#?
GetCursorPos(&pt); :f Rta[
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); nl2Lqu1
if(id==ID_EXITICON) t5l<Lm)
DeleteIcon(); DHn\ =M
else if(id==ID_EXIT) w ;$elXP|
OnCancel(); IW nG@!
return FALSE; \``w>Xy8
} tAjT-CXg
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ![{/V,V]~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \l0!si
AddIcon(); Fi+DG?zu
return res; G$*=9`
} jm&[8ApW
|;V-;e*
void CCaptureDlg::AddIcon() ,>(X}Q
{ zuMz6#aCC8
NOTIFYICONDATA data; ByoI+n* U
data.cbSize=sizeof(NOTIFYICONDATA); -[>J"l
CString tip; sDgo G
tip.LoadString(IDS_ICONTIP); .yTo)t
data.hIcon=GetIcon(0); y<IHZq`C3
data.hWnd=GetSafeHwnd(); L6qK3xa}
strcpy(data.szTip,tip); L1lDDS#
data.uCallbackMessage=IDM_SHELL; F_@`
<d!
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %eHr^j~w$
data.uID=98; Pt-mLINvG
Shell_NotifyIcon(NIM_ADD,&data); :k_)Bh?+
ShowWindow(SW_HIDE); N>L)2WKFT
bTray=TRUE; r.LO j6c
} CPsl/.$tC
nmL|v
void CCaptureDlg::DeleteIcon() -*&aE~Cs
{ &> .QDO
NOTIFYICONDATA data; ,lCFe0>k!=
data.cbSize=sizeof(NOTIFYICONDATA); +c]D2@ctG
data.hWnd=GetSafeHwnd(); V=1yg24B<
data.uID=98; Y -BZV |
Shell_NotifyIcon(NIM_DELETE,&data); K vPLA{
ShowWindow(SW_SHOW); U\{I09@E 0
SetForegroundWindow(); [4;_8-[Nv
ShowWindow(SW_SHOWNORMAL); B2BG*xa
bTray=FALSE; !:vQg+S
} b+AxTe("
gi:M=
void CCaptureDlg::OnChange() 5B1,,8P
{ e=jtF"&
RegisterHotkey(); qoph#\
} fk2Uxg=[
C_[
d
BOOL CCaptureDlg::RegisterHotkey() ?<0'h{z Ny
{ 3M^`6W[;
UpdateData(); ze+S_{
UCHAR mask=0; #\ ="^z6
UCHAR key=0; ]t17= Lr?
if(m_bControl) 1G(wESe
mask|=4; 2,|@a\H
if(m_bAlt) zuJ` 704
mask|=2; GXv2B%i8
if(m_bShift) h52+f
mask|=1; Pa; *%7
key=Key_Table[m_Key.GetCurSel()]; Cx) N;x
if(bRegistered){ `x L@%
DeleteHotkey(GetSafeHwnd(),cKey,cMask); yYaYuf
bRegistered=FALSE; sSiZG
} Z>NA 9:
cMask=mask; F')E)tV
cKey=key; \"yR[.Q?
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T sJ71
return bRegistered; O9N%dir
} S]&i<V1qX
f .h$jyp(
四、小结 BNJG-b|g^
"1P2`Ep;
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。