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:
v4`"1Ss,K
:OhHb#D 一、实现方法
@ hiCI.?X pz\
+U7 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:
j7$e28|_n {GK;63`1 #pragma data_seg("shareddata")
[B#R94 HHOOK hHook =NULL; //钩子句柄
wsZF;8u t UINT nHookCount =0; //挂接的程序数目
hKLCJ#T static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Dwr)0nk static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Zw5Ni Xj static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
V3Q+s8OIF static int KeyCount =0;
-D static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Xqg@ e:g #pragma data_seg()
\r^qL^ }Jy8.<Gd^ 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=T
~x 9kN}c<o 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:
A&.WH?p 42{Ew8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
0QXVW}`hz cKey,UCHAR cMask)
5[k/s}g {
z&#SPH* BOOL bAdded=FALSE;
nBjqTud
for(int index=0;index<MAX_KEY;index++){
W>Y@^U&x` if(hCallWnd[index]==0){
+7D|4 hCallWnd[index]=hWnd;
fi-WZ HotKey[index]=cKey;
LSa,1{ HotKeyMask[index]=cMask;
Q]Y*K bAdded=TRUE;
A-Sv;/yD_ KeyCount++;
xu/cq9 break;
D.B.7-_8 }
H[s(e56z }
sT 3^hY7 return bAdded;
V+*
P2| }
8n#HFJ~ //删除热键
c]x1HvPE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
FcR=v0), {
[-65PC4aN BOOL bRemoved=FALSE;
~P*6ozSYpY for(int index=0;index<MAX_KEY;index++){
~("5yG if(hCallWnd[index]==hWnd){
lP[w?O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.*@;@06? hCallWnd[index]=NULL;
8{wwd:6 HotKey[index]=0;
9_# >aOqL HotKeyMask[index]=0;
Tzt8h\Q^z bRemoved=TRUE;
%+@O#P KeyCount--;
m'Amli@[ break;
5L+>ewl }
$?
m9") }
3QV *% }
y?[ v=j*U return bRemoved;
7]U"Z* }
"Q}#^h]F ,0~^>K bZnuNYty75 DLL中的钩子函数如下:
aXQnZ+2e^R 09X01X[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
oz,np@f)J {
l7XUXbYp&= BOOL bProcessed=FALSE;
?x$"+, if(HC_ACTION==nCode)
6CV*
Z\b {
n&{Dq}q if((lParam&0xc0000000)==0xc0000000){// 有键松开
gy,ht3 switch(wParam)
;+e}aER&9 {
NTdixfR case VK_MENU:
Upc+Ukw MaskBits&=~ALTBIT;
49rf7NT-g break;
NaPt"G case VK_CONTROL:
HKU~UTRnZ MaskBits&=~CTRLBIT;
ujDd1Bxf? break;
@KWb+?_H{< case VK_SHIFT:
RTvqCp MaskBits&=~SHIFTBIT;
-(~.6WnhS break;
S/}2; \Xm default: //judge the key and send message
txJr; break;
d:ARf }
|*oZ_gI for(int index=0;index<MAX_KEY;index++){
OglEt[ " if(hCallWnd[index]==NULL)
I(]}XZq continue;
cQ/5qg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`e(c^ z# {
t#Z-mv:( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~8~aJ^[ bProcessed=TRUE;
y[`l3;u:' }
w:%o?pKet1 }
NgADKrDU }
I
CZ4A{I else if((lParam&0xc000ffff)==1){ //有键按下
hLI`If/+K switch(wParam)
UM!ENI| {
NiWa7 /Hr case VK_MENU:
]Uw<$!$-]s MaskBits|=ALTBIT;
!Nu<xq@! break;
<A[E:*`* case VK_CONTROL:
&)8:h+&Z MaskBits|=CTRLBIT;
L;
T8?+ x break;
:j5n7s?&=y case VK_SHIFT:
2VF%@p MaskBits|=SHIFTBIT;
qd9c I& break;
bBu,#Mc default: //judge the key and send message
{G|,\O1 break;
9:fOYT$8 }
Q~814P8] for(int index=0;index<MAX_KEY;index++){
oeKHqP wg if(hCallWnd[index]==NULL)
N8!cO[3Oh continue;
3 j!3E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
x9$` W {
@|Fg,N<Y] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
IYqBQnX}oM bProcessed=TRUE;
B||*.`3gN }
Scp7X7{N }
BS /G("oZ[ }
\[BK1JP if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
tna .52*/ for(int index=0;index<MAX_KEY;index++){
_6_IP0; if(hCallWnd[index]==NULL)
~1cnE:x;V continue;
3Dg,GaRk if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
FjK3
.>' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
F
;{n"3< //lParam的意义可看MSDN中WM_KEYDOWN部分
&yGaCq;0 }
rE iKi }
@L>q(Kg }
@*}D$}aR'V return CallNextHookEx( hHook, nCode, wParam, lParam );
d1T,eJ} }
vK 7^*qr;j /rg*p 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
SLO%7%>p EzDk}uKY0R BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
e@c0WlWa BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F4It/ L~_9_9c 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
6726ac{xz zEs>b(5u LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"vXxv'0\f {
xG}(5Tt if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
0zo?eI {
7+]=- //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
pF&(7u SaveBmp();
0.dgoq3u return FALSE;
m6n?bEl6I }
Sczc5FG …… //其它处理及默认处理
;epV<{e$q4 }
p+l !6 EPS={w$'s cj+ FRG~u 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。
sW)Zi f&}k^>N#3 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。
T;@;R% I([!]z 二、编程步骤
RMd[Yr2e SfgU`eF%B 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
^[]}R: fNb`X 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
9UKp?SIF g) p,5BADm 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;
qP{/[uj[K ktj]:rCkF 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;
,stN NLS%S q 5、 添加代码,编译运行程序。
/V8}eZ97 ':gUOra|I 三、程序代码
T?:glp[4I JAAI_gSR3 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Q>/C*@ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Ynp{u`? #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Jj,U RD&0R #if _MSC_VER > 1000
._8KsuJG #pragma once
Vnx,5E& #endif // _MSC_VER > 1000
gN24M3{C #ifndef __AFXWIN_H__
6:q"l\n> #error include 'stdafx.h' before including this file for PCH
Z-E`> #endif
5O~HWBX. #include "resource.h" // main symbols
}| J79s2M class CHookApp : public CWinApp
T^T[$26 {
N-I5X2 public:
nA
P.^_K CHookApp();
A;/-u<f // Overrides
@fs`=lL/ // ClassWizard generated virtual function overrides
B*4}GPQ //{{AFX_VIRTUAL(CHookApp)
ta`N8vnf public:
N5]0/,I} virtual BOOL InitInstance();
>=UF-xk; virtual int ExitInstance();
1WY/6[ //}}AFX_VIRTUAL
dDm):Z*`b //{{AFX_MSG(CHookApp)
][W_[0v // NOTE - the ClassWizard will add and remove member functions here.
f>piHh? // DO NOT EDIT what you see in these blocks of generated code !
Jrg2/ee,* //}}AFX_MSG
w QNxL5B DECLARE_MESSAGE_MAP()
@;<ht c };
M9y<t' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
(T!9SU BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
TJ:]SB BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
krsYog(^z BOOL InitHotkey();
]Ar\c[" BOOL UnInit();
dxZu2&gi #endif
({JHZ6uZ ?[)}l9 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
io#&o;M< #include "stdafx.h"
yY[<0|o u #include "hook.h"
x9x E& #include <windowsx.h>
H^.IY_I`U* #ifdef _DEBUG
tZ `z #define new DEBUG_NEW
Q$:![}[( #undef THIS_FILE
X{we/'> static char THIS_FILE[] = __FILE__;
U Z|HJ8_ #endif
h$.:Uj8/ #define MAX_KEY 100
'ihhoW8 #define CTRLBIT 0x04
tID%}Z v #define ALTBIT 0x02
NzU,va N #define SHIFTBIT 0x01
qTAc[Ko #pragma data_seg("shareddata")
V5GW:QT HHOOK hHook =NULL;
~=KJzOS,S UINT nHookCount =0;
?p(/_@ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
n>A98NQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)$`wIp static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
(y?ITz9 static int KeyCount =0;
}|5VRJA static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
GrTulN? #pragma data_seg()
=e gW HINSTANCE hins;
c%[#~;E void VerifyWindow();
Ux#x#N BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
a)S+8uU //{{AFX_MSG_MAP(CHookApp)
"=6v&G]U4 // NOTE - the ClassWizard will add and remove mapping macros here.
B Ce|is0 // DO NOT EDIT what you see in these blocks of generated code!
K-f1{ 0 //}}AFX_MSG_MAP
UN%Vg:= END_MESSAGE_MAP()
F29va \mw(cM#: CHookApp::CHookApp()
1~l
I8 {
^':!1 // TODO: add construction code here,
c\ia6[3sX // Place all significant initialization in InitInstance
?Q-h n:F) }
E[O<S B
I 52b*[tZ CHookApp theApp;
*J+_|_0nlW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Vpr/ {
p/2jh& BOOL bProcessed=FALSE;
"H&"(= if(HC_ACTION==nCode)
(u]N {
Iw<j T|y) if((lParam&0xc0000000)==0xc0000000){// Key up
*dvDap|8W switch(wParam)
Q 2A7mGN {
@ JvPx 0 case VK_MENU:
&AlJ "N| MaskBits&=~ALTBIT;
2_ :n break;
t=*@yQ
nB case VK_CONTROL:
$t5V=}m> MaskBits&=~CTRLBIT;
mo1oyQg8 break;
`Pw*_2 case VK_SHIFT:
7T"XPV|W6 MaskBits&=~SHIFTBIT;
MwfOy@|N break;
y$3;$ R^ default: //judge the key and send message
L:(1ZS break;
'S2bp4G }
xl"HotsX-x for(int index=0;index<MAX_KEY;index++){
? tfT8$ if(hCallWnd[index]==NULL)
]uspx[UIc continue;
kGL1!=> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
XxDaz1 {
\o\nr!=k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
pGSai& bProcessed=TRUE;
Y=` }
~V/?H!r'{} }
nuo Pg3Nl }
DfV~!bY else if((lParam&0xc000ffff)==1){ //Key down
$!5\E>y# switch(wParam)
*xE,sj+( {
~+<olss_ case VK_MENU:
G60R9y47c MaskBits|=ALTBIT;
peJKNX.!q break;
rCS#{x case VK_CONTROL:
8vuCc= MaskBits|=CTRLBIT;
a=XW[TY1 break;
BS&;n case VK_SHIFT:
^'p|!`: MaskBits|=SHIFTBIT;
.[u>V break;
15$4&=O default: //judge the key and send message
?<Y+peu break;
kD) $2I? }
#q3l!3\mW for(int index=0;index<MAX_KEY;index++)
l;sy0S"DO] {
-`f04_@>d if(hCallWnd[index]==NULL)
n6(i`{i continue;
x f4{r+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]I/Vb s {
&TG5rUUg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`VQb-V bProcessed=TRUE;
BZb]SoAL }
[TF8'jI0 }
rdnRBFt }
8F)G7
H, if(!bProcessed){
y fSM for(int index=0;index<MAX_KEY;index++){
?R-9W+U%f if(hCallWnd[index]==NULL)
]O{u tm continue;
W>M~Sk$v if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
\V2,pi8'v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
y<XlRTy[} }
MHL("v(@B }
L:M0pk{T }
1Uf*^WW4 return CallNextHookEx( hHook, nCode, wParam, lParam );
x90jw$\%7 }
_ nP;Fx 'SLE;_TD BOOL InitHotkey()
7n)&FXK` {
0Q5 93F if(hHook!=NULL){
bXYA5wG nHookCount++;
ha;l(U> return TRUE;
_,6f#t }
D\^WXY5e%y else
aFY_:.o2k` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
69kJC/1+l if(hHook!=NULL)
6AN)vs} nHookCount++;
^D@b;EyK return (hHook!=NULL);
gM>=%/. }
BO.dz06(Rw BOOL UnInit()
v&g0ta@ {
'mdM q=VI if(nHookCount>1){
'f/Lv@]a nHookCount--;
PiLJZBUv return TRUE;
IGFGa@C }
OlxX.wP BOOL unhooked = UnhookWindowsHookEx(hHook);
Wv!<bT8r if(unhooked==TRUE){
SW(q$i nHookCount=0;
nY `2uN~9 hHook=NULL;
GR'Ti*Qi }
0;~yZ?6_F return unhooked;
}tST)=M` }
,6<" *! :QdWLq BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H L<s@kEZ {
S"snB/ BOOL bAdded=FALSE;
<
/p8r for(int index=0;index<MAX_KEY;index++){
P\~{3U if(hCallWnd[index]==0){
BOf1J1 hCallWnd[index]=hWnd;
N~=A HotKey[index]=cKey;
NWmtwS+@ HotKeyMask[index]=cMask;
KA]*ox6j; bAdded=TRUE;
j?(!^ _!m KeyCount++;
[JTto!Ih$ break;
TbE:||r?^ }
XOb}<y)r~ }
$*~Iu%Az return bAdded;
~hN~>0O }
H*e'Cs/ Y'"N"$n'_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V*jsq[q= {
+6W(z3($ BOOL bRemoved=FALSE;
v%{0 Tyk for(int index=0;index<MAX_KEY;index++){
!FG%2L4?,5 if(hCallWnd[index]==hWnd){
es.CLkuD7Y if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"/x_>ui1F hCallWnd[index]=NULL;
;q#]-^ HotKey[index]=0;
B0mLI%B HotKeyMask[index]=0;
(wt+`_6 bRemoved=TRUE;
6p<`h^ KeyCount--;
M^SuV break;
p6 xPheD }
Iz\1~ }
zjM/M }
4L:>4X[T return bRemoved;
`6w#8} }
P2k7M(I_& k
'zat3#f void VerifyWindow()
RtF8A5ys {
ZCiY,;c for(int i=0;i<MAX_KEY;i++){
K84&sSi if(hCallWnd
!=NULL){ ,ECAan/@
if(!IsWindow(hCallWnd)){ Z[IM<S9lz
hCallWnd=NULL; xks?y.wA
HotKey=0; f]_mzF=&
HotKeyMask=0; >BiRk%x
KeyCount--; e@
oWwhpE
} :1<~}*B@{
} ju{%'D!d9
} wGXwzU
} E$S`6+x`:a
eqFvrESN~=
BOOL CHookApp::InitInstance() __)qw#
{ F'BdQk3o
AFX_MANAGE_STATE(AfxGetStaticModuleState()); %x2b0L\g
hins=AfxGetInstanceHandle(); %,? vyY
InitHotkey(); L+R>%d
s
return CWinApp::InitInstance(); XS/n>C
} nPf'ee
8eX8IR!K9
int CHookApp::ExitInstance() ~I$}#
{ BI/y<6#rR
VerifyWindow(); W8*
2;F]
UnInit(); qY}Cg0[@g
return CWinApp::ExitInstance(); _;G=G5r
} aL)Hv k:
U"x~Jb3]O
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Wm>b3:
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d pn3 (
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oc;VIK)g]c
#if _MSC_VER > 1000 1f;or_f#k?
#pragma once FNJ!IkuR
#endif // _MSC_VER > 1000 B/_6Ieb+
3Uo]>BG
class CCaptureDlg : public CDialog )Pa*+ew7
{ Q?]w{f(
// Construction y< ud('D
public: 7vNtv9
BOOL bTray; s!`H
BOOL bRegistered; T/Q==Q{W:
BOOL RegisterHotkey(); u\w 2S4c
UCHAR cKey; *[
#*n n
UCHAR cMask; AA.Ys89V
void DeleteIcon(); a
8-;
void AddIcon(); ;_p fwa4
UINT nCount; kxy]vH6m
void SaveBmp(); "uS7PplyO
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4@/z
// Dialog Data x
Ty7lfSe
//{{AFX_DATA(CCaptureDlg) &q L<C
enum { IDD = IDD_CAPTURE_DIALOG }; 8 >dq=0:
CComboBox m_Key; Vku#;:yUb^
BOOL m_bControl; ?q6Z's[
BOOL m_bAlt; S|) J{~QH
BOOL m_bShift; t.L4%1OF
CString m_Path; :@;6
CString m_Number; ? KF=W
//}}AFX_DATA zM\IKo_"
// ClassWizard generated virtual function overrides {70Ou}*
//{{AFX_VIRTUAL(CCaptureDlg) 3FuCW
public: a>?p.!BM
virtual BOOL PreTranslateMessage(MSG* pMsg); _r[r8MB
protected: H8sK}1.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]qMH=>pOsj
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lh~<s2[R2
//}}AFX_VIRTUAL b.@H1L
// Implementation IQ=CNby:
protected: Pwg/Vhfh
HICON m_hIcon; D| [/>x
// Generated message map functions _Ws#UL+Nq
//{{AFX_MSG(CCaptureDlg) NQg'|Pt(%
virtual BOOL OnInitDialog(); K:uQ#W.&
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2*Va9HP!q
afx_msg void OnPaint(); nZ541o@t9
afx_msg HCURSOR OnQueryDragIcon(); t z"5+uuu
virtual void OnCancel(); K_Z+]]$#
afx_msg void OnAbout(); gu^_iU
afx_msg void OnBrowse(); 8F\~Wz 7K
afx_msg void OnChange(); {[my"n2
//}}AFX_MSG 87+.pM|t%
DECLARE_MESSAGE_MAP() "-28[a3q
}; +{S Maq
#endif prqyoCfq
FoQ?U=er
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O(WEgz
#include "stdafx.h" Ko4)0&
#include "Capture.h" N/(ofy
#include "CaptureDlg.h" =!(S<];
#include <windowsx.h> 8?A@/
#pragma comment(lib,"hook.lib") >).@Nb;e
#ifdef _DEBUG YGfA qI
y
#define new DEBUG_NEW D7EXqo
#undef THIS_FILE =7F E/S
static char THIS_FILE[] = __FILE__; FK-}i|di
#endif M\9at\$
#define IDM_SHELL WM_USER+1 <zfO1~^
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8y-e+
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +GRxHuW,
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h_AJI\{"
class CAboutDlg : public CDialog 9cl{hdP{
{ 9 )ACgz&(
public: bta0?O
#
CAboutDlg(); H<v c\r
// Dialog Data @QvfN>T
//{{AFX_DATA(CAboutDlg) :yd=No@
enum { IDD = IDD_ABOUTBOX }; (r.$%[,.<
//}}AFX_DATA s'R~r
// ClassWizard generated virtual function overrides qPp1:a"
//{{AFX_VIRTUAL(CAboutDlg)
*K]>}
protected: cjCE3V9X
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^nG1/}
//}}AFX_VIRTUAL e@='Q H
// Implementation THrc
H
protected: B)(p9]q
//{{AFX_MSG(CAboutDlg) 6 lB{Ao?|
//}}AFX_MSG zyIza @V(
DECLARE_MESSAGE_MAP() 0SAG6k~x
}; N{?Tm`""
i n[n Aa
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~Da
>{zHt
{ m~Lf^gbG?
//{{AFX_DATA_INIT(CAboutDlg) X7'h@>R
//}}AFX_DATA_INIT Hj}g1"RA
} [V!^\g\6
TKj/6Jz|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @t{{Q1
{ WyKUvVi
CDialog::DoDataExchange(pDX); P^'>dOI0w
//{{AFX_DATA_MAP(CAboutDlg) O+CF/ipX/
//}}AFX_DATA_MAP KUl
Zk^a
} ~$ cm9>
fS;m+ D!j@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) d +*T@k]>M
//{{AFX_MSG_MAP(CAboutDlg) ?M*C*/R
// No message handlers `<]P"G
//}}AFX_MSG_MAP mI{CM:
:
END_MESSAGE_MAP() @LwVmR |{
7v4-hfN
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B1 jH.(
: CDialog(CCaptureDlg::IDD, pParent) *g/I&'^
{ $G^H7|PzdC
//{{AFX_DATA_INIT(CCaptureDlg) ];YglHH
m_bControl = FALSE; A;/Xt
m_bAlt = FALSE; !VJT"Ds_
m_bShift = FALSE; bUipp\[aV
m_Path = _T("c:\\"); V!yp@%D
m_Number = _T("0 picture captured."); 3RTB~K8:{
nCount=0; W2X+NacD
bRegistered=FALSE; LiHXWi{s
bTray=FALSE; g:@Cg.q8
//}}AFX_DATA_INIT l:k E^ =6
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h:US]ZC^Z
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x r+E
} $AL|d[[T[
N8/Au=De_
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6w .iEb
{ B4M'Er{v
CDialog::DoDataExchange(pDX); XH_qA[=c]
//{{AFX_DATA_MAP(CCaptureDlg) $)i"[
DDX_Control(pDX, IDC_KEY, m_Key); $yxIE}
DDX_Check(pDX, IDC_CONTROL, m_bControl); e-T9HM&%P
DDX_Check(pDX, IDC_ALT, m_bAlt); f R{WS:Pv
DDX_Check(pDX, IDC_SHIFT, m_bShift); #q^>qX
y
DDX_Text(pDX, IDC_PATH, m_Path); *SAcH_I2$>
DDX_Text(pDX, IDC_NUMBER, m_Number); ua. 6?W)
//}}AFX_DATA_MAP |~T+f&
} (t]R#2{
PHB\)/
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]>]H:NEq
//{{AFX_MSG_MAP(CCaptureDlg) 3 `C3+
ON_WM_SYSCOMMAND() 0 ^-b}
ON_WM_PAINT() rnt$BB[g
ON_WM_QUERYDRAGICON() m SvTnd8
ON_BN_CLICKED(ID_ABOUT, OnAbout) r:S5x. P2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8)Bn?6.
ON_BN_CLICKED(ID_CHANGE, OnChange) E rRMiT
//}}AFX_MSG_MAP RAXJsF^5o
END_MESSAGE_MAP() [$ Xu
5E!|on
BOOL CCaptureDlg::OnInitDialog() fe]T9EDA
{ )F9V=PJE
CDialog::OnInitDialog(); n*]x02:LjZ
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oU{-B$w
ASSERT(IDM_ABOUTBOX < 0xF000); jind!@}!
CMenu* pSysMenu = GetSystemMenu(FALSE); J jL0/&
if (pSysMenu != NULL) s9)8{z
{ ;:K?7wfXn
CString strAboutMenu; F^[Rwzv>c
strAboutMenu.LoadString(IDS_ABOUTBOX); DyV[+P
if (!strAboutMenu.IsEmpty()) A_dYN?^?|
{ d`rDEa
pSysMenu->AppendMenu(MF_SEPARATOR); =?QQb>
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i_Q4bhVj
} ]&%X(jWyn
} l'X?S(fiV
SetIcon(m_hIcon, TRUE); // Set big icon 8CHf. SXh
SetIcon(m_hIcon, FALSE); // Set small icon l[OQo|_
m_Key.SetCurSel(0); iS^^Z ZyR
RegisterHotkey(); .m
% x-i
CMenu* pMenu=GetSystemMenu(FALSE); 3jQ$72_
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Nl>b'G96
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d(cYtM,P
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _O'rZ5}&
return TRUE; // return TRUE unless you set the focus to a control $2Tty 7
} SF}L3/C&h
u K &_IE}
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) XwqfWd_
{ ;{#M
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4rCqN.J
{ tw^.(m5d
CAboutDlg dlgAbout; \y+F!;IxL
dlgAbout.DoModal(); Vam8NnZ|r
} E~U|v'GCd
else TEy.zzt
{ o]k]pNO
CDialog::OnSysCommand(nID, lParam); 6O?S r,
} %.}
} i7E7%~S
I.0Usa"z
void CCaptureDlg::OnPaint() HGMH
g
{ {.[,ee-)9
if (IsIconic()) yru}f;1
{ FKTP0e7=9
CPaintDC dc(this); // device context for painting 04LVa|Y@U
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
oEf^o*5(
// Center icon in client rectangle g0U\AN
int cxIcon = GetSystemMetrics(SM_CXICON); Wam?(!{mOf
int cyIcon = GetSystemMetrics(SM_CYICON); Jywz27j
CRect rect; :re(khZq#
GetClientRect(&rect); @g` ,'r
int x = (rect.Width() - cxIcon + 1) / 2; eyp\h8!u_
int y = (rect.Height() - cyIcon + 1) / 2; JH,fg K+[
// Draw the icon PW\FcT
dc.DrawIcon(x, y, m_hIcon); :l[Q
} P_Ja?)GT
else `Y$5g~3.
{ "+C\f)
CDialog::OnPaint(); $CV'p/^En
} DFH6.0UW
} \Xp"I5
tAn6pGp
HCURSOR CCaptureDlg::OnQueryDragIcon() "+Yn;9
{ ;'+cT.cmH
return (HCURSOR) m_hIcon; pIjVJ9+j
} jCa;g{#@
)4C6+63OD&
void CCaptureDlg::OnCancel() "C|l3X'
{ b,sc
if(bTray) DN_C7\CoA
DeleteIcon(); }J
lW\#
CDialog::OnCancel(); 1Ac1CsK*
} P.P>@@+d
S,>n'r[
void CCaptureDlg::OnAbout() XOFaS '.
{ -JQg{A
CAboutDlg dlg; q{(&:~M
dlg.DoModal(); m^+~pC5
} v%Xe)D
xb;mm9H
void CCaptureDlg::OnBrowse() e@By@r&nql
{ e8v=n@0
CString str; aC`
c^'5
BROWSEINFO bi; hdb4E|'A
char name[MAX_PATH]; Puh&F< B
ZeroMemory(&bi,sizeof(BROWSEINFO)); 4Fq}*QJ-
bi.hwndOwner=GetSafeHwnd(); x~^nlnKVf
bi.pszDisplayName=name; ?8/h3xV;
bi.lpszTitle="Select folder"; B.jYU
bi.ulFlags=BIF_RETURNONLYFSDIRS; B/}>UHM
LPITEMIDLIST idl=SHBrowseForFolder(&bi); {D#`+uw
if(idl==NULL) ARo5 Ss{
return; z`SkKn0f
Y
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >AJ|F)
str.ReleaseBuffer(); 7L"/4w
m_Path=str; r0>T7yPAK
if(str.GetAt(str.GetLength()-1)!='\\') 4r&~=up]
m_Path+="\\"; W
aU_Z/{0
UpdateData(FALSE); \eCdGx?
} !NjE5USi
RwWQ$Eb_s
void CCaptureDlg::SaveBmp() b.&YUg[#
{ <ZEA&:p
CDC dc; 7(Kc9sJC%%
dc.CreateDC("DISPLAY",NULL,NULL,NULL); W{d/m;<@N
CBitmap bm; ;*p}~#2
int Width=GetSystemMetrics(SM_CXSCREEN); Viw3 /K
int Height=GetSystemMetrics(SM_CYSCREEN); =UY@,*q:c
bm.CreateCompatibleBitmap(&dc,Width,Height); `<q5RuU
CDC tdc; yk/XfwQ5
tdc.CreateCompatibleDC(&dc); K#@FKv|("
CBitmap*pOld=tdc.SelectObject(&bm); {'%=tJ[YX
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); clNP9{
tdc.SelectObject(pOld); v#xF;@G
BITMAP btm; /_\4(vvf
bm.GetBitmap(&btm); 2_Z60]
DWORD size=btm.bmWidthBytes*btm.bmHeight; oLoa71Q}
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +8M{y D9#
BITMAPINFOHEADER bih; &7LfNN`
bih.biBitCount=btm.bmBitsPixel; vNIQc "\-
bih.biClrImportant=0; _1ins;c52
bih.biClrUsed=0; {YFru6$
bih.biCompression=0; Qw:j2g2H7
bih.biHeight=btm.bmHeight; Er)b( Kk
bih.biPlanes=1; x&
S >Mr
bih.biSize=sizeof(BITMAPINFOHEADER); G`jhzG
bih.biSizeImage=size; .@'Vz;&mQ
bih.biWidth=btm.bmWidth; ~gN'";1i
bih.biXPelsPerMeter=0; 5>
UgBA
bih.biYPelsPerMeter=0; 6c :$[owC
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Dts:$PlCk
static int filecount=0; eR
CGr?e4
CString name; 43Q&<r$[T
name.Format("pict%04d.bmp",filecount++); s6I]H
name=m_Path+name; ]+AI:
BITMAPFILEHEADER bfh; ctGjqHo
bfh.bfReserved1=bfh.bfReserved2=0; B}W^s;h
bfh.bfType=((WORD)('M'<< 8)|'B'); })B)-8
bfh.bfSize=54+size; \iFE,z
bfh.bfOffBits=54; n2E2V<#
CFile bf; =LR UasF
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +] #>6/2q
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m<E7cY3mX
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); er53?z7zP.
bf.WriteHuge(lpData,size); _Qv4;a
bf.Close(); B7#;tCf
nCount++; 8)i\d`
} 7Qo*u;fr
GlobalFreePtr(lpData); ^C(AMT
if(nCount==1) 4ngiad6bR
m_Number.Format("%d picture captured.",nCount); M?,;TJ7Gd
else IflpM ]
m_Number.Format("%d pictures captured.",nCount); 0xC!d-VIJ
UpdateData(FALSE); eA!aUu
} VR'w$mp
<Sz9: hg-
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) toF@@%
{ PgVM>_nHk
if(pMsg -> message == WM_KEYDOWN) `q F:rQ
{ kr3ZqMfeI
if(pMsg -> wParam == VK_ESCAPE) >6@UjGj54
return TRUE; }%VHBkuc
if(pMsg -> wParam == VK_RETURN) 9Vp$A$7M
return TRUE; 4-m}W;igu
} hVd63_OO
return CDialog::PreTranslateMessage(pMsg); m8FKr/Z-
} 'HOt?lpu!
&R 0BuFL8
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aUd633
{ Lg'z%pi
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ le*pd+> j
SaveBmp(); A>X#[qx
return FALSE; k(T/ydrw
} RlpW)\{j?
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ OrzDr
CMenu pop; C3D1rS/I
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^.k}YSWut
CMenu*pMenu=pop.GetSubMenu(0); P*\.dAi
pMenu->SetDefaultItem(ID_EXITICON); J H6\;G6
CPoint pt; v=|ahsYC
GetCursorPos(&pt); .rwZ`MP
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /H}83 C
if(id==ID_EXITICON) p`Ax)L\f
DeleteIcon(); H=B8'N
else if(id==ID_EXIT) RF qbwPX
OnCancel(); SC'fT!
return FALSE; ~~>D=~B0'
} ^ng?+X>mP
LRESULT res= CDialog::WindowProc(message, wParam, lParam); q4Q1Ib-<2
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) yY8q{\G
AddIcon(); nd-y`@z
return res; I:[3x2H
} R\)pW9)
NCBS=L:
void CCaptureDlg::AddIcon() kAU[lPt*R
{ 5v8_ji#l[
NOTIFYICONDATA data; W,}C*8{+
data.cbSize=sizeof(NOTIFYICONDATA); k/cQJz
CString tip; *uNa(yd
tip.LoadString(IDS_ICONTIP); )V} t(>V
data.hIcon=GetIcon(0); 8IbHDDS
data.hWnd=GetSafeHwnd(); }~yhkt5K
strcpy(data.szTip,tip); A@+pvC&
data.uCallbackMessage=IDM_SHELL; ,SH))%Cyt
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;i> |5tEy
data.uID=98; an=8['X
Shell_NotifyIcon(NIM_ADD,&data); 2{% U\^-
ShowWindow(SW_HIDE); o{lR_
bTray=TRUE; &+Xj%x.]
} *#w+*ywVZH
*C Me:a
void CCaptureDlg::DeleteIcon() H9F\<5n]-l
{
I4,C-D
NOTIFYICONDATA data; +g>)Bur
data.cbSize=sizeof(NOTIFYICONDATA); :iP2e+j
data.hWnd=GetSafeHwnd(); h%9#~gJ})
data.uID=98; *xI0hFJIM
Shell_NotifyIcon(NIM_DELETE,&data); S2'./!3yv
ShowWindow(SW_SHOW); ?vp'
/l"
SetForegroundWindow(); ^giseWR(
ShowWindow(SW_SHOWNORMAL); sFuB[
JJ}
bTray=FALSE; &;DK^ta*P
} CI{? Kb
1/:WA:]1,
void CCaptureDlg::OnChange() [< Bk% B5
{ Y92wL}
RegisterHotkey(); ~7IXJeon
} 2x<,R/}
q' fZA;
BOOL CCaptureDlg::RegisterHotkey()
p"\Z@c
{ a<*q+a(*W
UpdateData(); "N>~]
UCHAR mask=0; ZF^$?;'3
UCHAR key=0; 4i|yEf
if(m_bControl) 3|x*lmit
mask|=4; +"Flu.+['
if(m_bAlt) F!(Vg
mask|=2; yyB;'4Af
if(m_bShift) R~
n[g
mask|=1; 7uQiP&v
key=Key_Table[m_Key.GetCurSel()]; f9ux+XQk9
if(bRegistered){ j1D 1tn
DeleteHotkey(GetSafeHwnd(),cKey,cMask); /vO8s??
bRegistered=FALSE; !Lkk1zo
} 3Z/_}5%"
cMask=mask; 7vZtEwC)n
cKey=key; [}:;B$,
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); HueGARS
return bRegistered; AH-B/c5
} GWd71ZtFO
2[}
O:
四、小结 j}u b
0+S ;0
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。