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:
6x%h6<#xh*
70eb]\% 一、实现方法
'LE=6{# [rSR:V?"a 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:
<y?r!l=Am ;N0~;I #pragma data_seg("shareddata")
Jz2N HHOOK hHook =NULL; //钩子句柄
'coV^~qy UINT nHookCount =0; //挂接的程序数目
T-U}QM_e static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
_t^{a]/H static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
oyYR-4m\ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
rV T{90, static int KeyCount =0;
XBp? w static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-De9_0#R #pragma data_seg()
' <@3i[M 7G/1VeVjB 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。
k\NMy#]Zt =g|IG
[V 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:
Ht&:-F+dm 4X+ifZO BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
):b$xNn cKey,UCHAR cMask)
=5(>q5Z* {
1$p2}Bf{n BOOL bAdded=FALSE;
@Bf%s(Uj+ for(int index=0;index<MAX_KEY;index++){
v5QqS8u_C if(hCallWnd[index]==0){
K>DRJz hCallWnd[index]=hWnd;
ZHm7Isa1 HotKey[index]=cKey;
H\0~#(z?. HotKeyMask[index]=cMask;
4}eepJOn bAdded=TRUE;
B4i!/@0s KeyCount++;
TjwBv6h break;
i5CK*"$Q }
JNJ=e,O, }
f]\CD<g3|E return bAdded;
t3&LO~Ye }
&GB:|I'%7 //删除热键
L 8dc(Z%v BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
l@\#Ywz {
6 1F(<! BOOL bRemoved=FALSE;
V;:j ZpG for(int index=0;index<MAX_KEY;index++){
98uV6b~g if(hCallWnd[index]==hWnd){
\kU &^Hi if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
RF%KA[Dj hCallWnd[index]=NULL;
y&?6FY HotKey[index]=0;
NqDHCI HotKeyMask[index]=0;
(4dhuT bRemoved=TRUE;
}Du}c3 KeyCount--;
urMG*7i <c break;
lna}@]oR }
a*ushB }
A8oo@z68n> }
'~&9D:( return bRemoved;
LYaZ1* }
t\%HX.8[;% Ipq"E e= .njMqW5 DLL中的钩子函数如下:
Pl"Nus JAQb{KefdO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
MBhWMCN2 {
/.o^R6 BOOL bProcessed=FALSE;
P#XID 2; if(HC_ACTION==nCode)
b;cdIl!3 {
YYu6W@m] if((lParam&0xc0000000)==0xc0000000){// 有键松开
SVB \ switch(wParam)
s1h/} {
n3D;"a3 case VK_MENU:
7zSLAHW MaskBits&=~ALTBIT;
IbP#_Vt break;
~XWQhIAM4 case VK_CONTROL:
E~gyy]8& MaskBits&=~CTRLBIT;
] 0B2#
d break;
&'}/f5s| case VK_SHIFT:
cxr=k%~}J MaskBits&=~SHIFTBIT;
qCqFy#Ms\ break;
b7wvaRe. default: //judge the key and send message
fH> NJK; break;
'4|-9M3f }
h9Y%{v for(int index=0;index<MAX_KEY;index++){
}#Qc \eud if(hCallWnd[index]==NULL)
U~j
^I^ continue;
=yyp?WmC8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
s8rE$ {
m|:_]/*qE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
j&Wl0 bProcessed=TRUE;
7|[mz> "d }
)>`G }
P:aJ# }
:kf`?u else if((lParam&0xc000ffff)==1){ //有键按下
Wu_kx2h switch(wParam)
_G.>+!"2/
{
\8 h;K>=h case VK_MENU:
OSf}Q=BL MaskBits|=ALTBIT;
}t%!9hr5D break;
0Pe>Es|^A# case VK_CONTROL:
FcYFovS MaskBits|=CTRLBIT;
q11>f break;
nC}6B).el case VK_SHIFT:
[>1OJY.S}T MaskBits|=SHIFTBIT;
vOc 9ZE break;
D? 8rO" default: //judge the key and send message
T<w5vqFDu break;
g;8jK8Kh }
uJ5Eka for(int index=0;index<MAX_KEY;index++){
N0=ac5 if(hCallWnd[index]==NULL)
[zlN!.Z continue;
de;GrPLAi if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U9A~9"O {
3rcKzS7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)Ib<F7v bProcessed=TRUE;
:h&fbBH }
f/Hm{<BY
}
lobGj8uxq }
cnFI
&,FM if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
]):<ZsT for(int index=0;index<MAX_KEY;index++){
g)_e]& if(hCallWnd[index]==NULL)
L_+k12lm continue;
bV$)!]V if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
_;~,Cgfi SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
O Vko+X` //lParam的意义可看MSDN中WM_KEYDOWN部分
<Gt2(; }
jp"JafS/E }
8&3V#sn' }
MV\|e1B} return CallNextHookEx( hHook, nCode, wParam, lParam );
bBS,-vN }
%d>=+Ds[ K!'AkTW+- 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:
x7<\]94 'eJ+JM<0% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
j|/]#@Yr BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Lv'D^'I L\&<sy"H 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:
]"1`+q6i N\#MwLm LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1Lg-.-V
{
-t2+|J*
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
HKqwE=NZ {
e|p$d:#! //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
qd#sY.|1 SaveBmp();
;3kj2} return FALSE;
/u0'
6V }
rfgI$eu
…… //其它处理及默认处理
<oWB0% }
Tjl:|F8 q&Gz ] 8g:;)u4$P 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
;B?DfWX Gu'rUo3Do 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
n< ud> JIb GF>'\@Th 二、编程步骤
m^H21P"z #%D_Y33; 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
kH4Ai3#g .hba*dV 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Z7_ zMM 98WZ){+,m 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
wQiX<)O e][B7wZ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
qOUqs'7/] -,+q#F 5、 添加代码,编译运行程序。
h-m\% |D ~-dV^SO 三、程序代码
Nof3F/2 N& 66'?&Xx' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
GD:4"$)[o #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Uv?|G%cD- #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
FP>)&3>_ #if _MSC_VER > 1000
x#Q>J"g #pragma once
Vg>( Y, #endif // _MSC_VER > 1000
_^'I #ifndef __AFXWIN_H__
4lM8\Lr #error include 'stdafx.h' before including this file for PCH
>NKe'q<)3 #endif
PIWux{ #include "resource.h" // main symbols
Cz W:L&t class CHookApp : public CWinApp
GG0R}',0 {
*JaqTI,e public:
y8 KX<2s1 CHookApp();
N*`b%XGn3 // Overrides
Ga^Zb^y // ClassWizard generated virtual function overrides
V~hlq$jn<Y //{{AFX_VIRTUAL(CHookApp)
z9p05NFH public:
)6w}<W*1E virtual BOOL InitInstance();
*$"gaXI virtual int ExitInstance();
v\,N 5 //}}AFX_VIRTUAL
N,f4*PQ //{{AFX_MSG(CHookApp)
581e+iC~<H // NOTE - the ClassWizard will add and remove member functions here.
yY&3p1AxW] // DO NOT EDIT what you see in these blocks of generated code !
w~;I7: //}}AFX_MSG
3"kdjOB DECLARE_MESSAGE_MAP()
x+h~gckLb };
W?We6.%
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
[tH-D$V BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Kv rX{F= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JIFU;*PR1 BOOL InitHotkey();
uu/+.9 BOOL UnInit();
u1~9{"P* #endif
Zo}y(N1K} [J
C: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
78Aa|AJU #include "stdafx.h"
$&=p+ #include "hook.h"
'Vr$MaO #include <windowsx.h>
%',F #ifdef _DEBUG
R.s^o]vT #define new DEBUG_NEW
b:(- #undef THIS_FILE
p)=~% 7DV static char THIS_FILE[] = __FILE__;
g!`3{
/4 #endif
6AP~]e 8 #define MAX_KEY 100
8`]=C~G #define CTRLBIT 0x04
K9kUS #define ALTBIT 0x02
Y9=(zOqv #define SHIFTBIT 0x01
Y];Ycj; #pragma data_seg("shareddata")
rFZrYm HHOOK hHook =NULL;
k;EPpr-{ UINT nHookCount =0;
J j=; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
:qvI%1cP= static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
yE\wj static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
S/`%Q2za4 static int KeyCount =0;
{i*2R^5 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
bpkwn<7- #pragma data_seg()
}%-t+Tf, HINSTANCE hins;
7JDN{!jT void VerifyWindow();
S|zW^|YU BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
]O
TH"*j //{{AFX_MSG_MAP(CHookApp)
3^StIw{X // NOTE - the ClassWizard will add and remove mapping macros here.
PU {uE[ // DO NOT EDIT what you see in these blocks of generated code!
3:5DL!Sm8J //}}AFX_MSG_MAP
fRvAKz|rL END_MESSAGE_MAP()
L!'k !k M|[ZpM+ CHookApp::CHookApp()
k{AyD`'Q {
!$g+F(:(c // TODO: add construction code here,
f&x0@Q/eON // Place all significant initialization in InitInstance
I<=Df5M }
}4>JO"" e.o;eD}" CHookApp theApp;
aVe/
gE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{S<>&?XB {
?W0(|9 BOOL bProcessed=FALSE;
CodSJ, if(HC_ACTION==nCode)
e#/kNHl {
r,N[ )@ if((lParam&0xc0000000)==0xc0000000){// Key up
S :8OQI switch(wParam)
6S.~s6o, {
1#
t6`N]?V case VK_MENU:
~JuKV&&}K MaskBits&=~ALTBIT;
7@PIM5h break;
*]x*B@RF case VK_CONTROL:
]Y.deVw3i MaskBits&=~CTRLBIT;
DJQglt}~ break;
CiL94Nkd9 case VK_SHIFT:
vtMJ@!MN; MaskBits&=~SHIFTBIT;
}'=h4yI break;
fMeZ]rb default: //judge the key and send message
^+R:MBK break;
fj4^VXD }
{BO|u{C for(int index=0;index<MAX_KEY;index++){
1Qh`6Ya f if(hCallWnd[index]==NULL)
xq!IbVV/h continue;
&!y]:CC{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-U>7
H`5 {
{*/dD` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
d
`j?7Z bProcessed=TRUE;
^GYq#q9Q }
TRKgBK$, }
Z,WW]Y,$ }
?z"KnR+?Q else if((lParam&0xc000ffff)==1){ //Key down
1.R
kIB switch(wParam)
PM4>ThQ {
vZajT!h case VK_MENU:
|,}E0G. MaskBits|=ALTBIT;
g]`bnZ7 break;
(3md:r<- case VK_CONTROL:
4VIg>EL* MaskBits|=CTRLBIT;
=p&sl;PsLw break;
C>*n9l[M~ case VK_SHIFT:
xaL#MIR"u" MaskBits|=SHIFTBIT;
CtT~0Y| break;
B#tdLv"I default: //judge the key and send message
D&*LBQ/K break;
BDpF} }
4YJ=q% G for(int index=0;index<MAX_KEY;index++)
j;2<-{ {
C(]'&~}( if(hCallWnd[index]==NULL)
*=vlqpG continue;
WL\^F#: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fW~*6ln {
lEfBe)7+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
DuF7HTN[K bProcessed=TRUE;
O3!d(dY=_ }
u3Do~RyL[ }
yL"i
}
(^H5EeGV{ if(!bProcessed){
KzkgWMM for(int index=0;index<MAX_KEY;index++){
~tNY"{OV# if(hCallWnd[index]==NULL)
8U^D(jrz continue;
e d;"bb if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"2mFC! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ky&KF0 }
9bEM#Hj }
G&o64W;-s }
;i9>}]6 return CallNextHookEx( hHook, nCode, wParam, lParam );
6+8mV8{-8 }
b5Q8pWZg, ny`(f,)u* BOOL InitHotkey()
aRKv+{K {
l.7d$8'\ if(hHook!=NULL){
g9qC{xd nHookCount++;
Q>IH``1*e return TRUE;
6{7 3p@ }
h]P/KVqR. else
k6J\Kkk( hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
;\s~%~\ if(hHook!=NULL)
M]B3vPA/v nHookCount++;
[` 'd#pR return (hHook!=NULL);
x(vai1CrdH }
b8HE."*t BOOL UnInit()
+\U]p_Fo3 {
-,/3"}<^78 if(nHookCount>1){
L *{QjH nHookCount--;
"!a`ygqpT return TRUE;
HZuiVW8 }
Bhx<g&|j BOOL unhooked = UnhookWindowsHookEx(hHook);
<N5rv3
s if(unhooked==TRUE){
\=8=wQv nHookCount=0;
2C{/`N hHook=NULL;
q\U4n[Zk }
hpjUkGm5 return unhooked;
G)~MbesJ }
RnSm]}?
-? Tz.y& BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`+^sW#ki {
p6[#f96^u BOOL bAdded=FALSE;
T\cR2ZT~ for(int index=0;index<MAX_KEY;index++){
2R] XH
0 if(hCallWnd[index]==0){
Ym:{Mm=ud hCallWnd[index]=hWnd;
'&)D>@g HotKey[index]=cKey;
FbBX}n HotKeyMask[index]=cMask;
WCoF{* bAdded=TRUE;
r!~(R+,c KeyCount++;
,,}sK break;
u x#.:C| }
"SLvUzO>q }
_lNC<7+#h return bAdded;
+Tp%5+E }
v}f&q! qf)C%3gXI BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
&8wa ih(| {
Y!;gQeC BOOL bRemoved=FALSE;
?n&$m for(int index=0;index<MAX_KEY;index++){
r/^tzH's if(hCallWnd[index]==hWnd){
hMz&JJ&B if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=tNzGaWJ hCallWnd[index]=NULL;
^aT;aP^l HotKey[index]=0;
N-D(y HotKeyMask[index]=0;
Gxo#
! bRemoved=TRUE;
BL0|\&*1 KeyCount--;
.E#<fz break;
0FTRm2( }
Vj/fAHR`>' }
e/ WBgiLw }
T6,V return bRemoved;
@c0n2 Xcr }
a6k(9ZF ,7t3>9-M" void VerifyWindow()
T7^ulG1' {
b#Jo Xa9 for(int i=0;i<MAX_KEY;i++){
J
&{qppN if(hCallWnd
!=NULL){ #jhQBb4?,
if(!IsWindow(hCallWnd)){ v;Swo("
hCallWnd=NULL; .r7D)xNa@
HotKey=0; 0Y[*lM-
HotKeyMask=0; >1m)%zt
KeyCount--; c%jsu"
} 692Rw}/
} @l)\?IEF@f
} V;H
d)v(j
} *&(2`#C;
T=^jCH &
BOOL CHookApp::InitInstance() +g)_4fV0|
{ .4Iw=T_
AFX_MANAGE_STATE(AfxGetStaticModuleState()); `i=JjgG@
hins=AfxGetInstanceHandle(); Z+r%_|kZ
InitHotkey(); ^WmGo]<B_
return CWinApp::InitInstance(); nt drXg
} Xg,0 /P~
<%M\7NDWDA
int CHookApp::ExitInstance() $Z,i|K;
{ t8t}7XD
VerifyWindow(); .4H_Zt[2
UnInit(); KbXbT
return CWinApp::ExitInstance(); Po'-z<}wS
} Y||yzJdC
P/C&R-{')
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *~"zV`*Q
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gTqeJWX9wP
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i/5y^
#if _MSC_VER > 1000 ay=KfY5
#pragma once z\e>DdS
#endif // _MSC_VER > 1000 +fC#2%VnU
#.<*; rB
class CCaptureDlg : public CDialog wy,Jw3
{ gsLr=
// Construction |P^]@om
public: >]:N?[Y_~}
BOOL bTray; h9w@oRp`~
BOOL bRegistered; N8,EI^W8Z
BOOL RegisterHotkey(); S9$o
UCHAR cKey; Sg/:n,68
UCHAR cMask; QpdujtH`
void DeleteIcon(); t)\D
void AddIcon(); 6W)xj6<@
UINT nCount; 'q{PtYr
void SaveBmp(); %T`4!:vy
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6.7`0v?,n
// Dialog Data qgwv=5|
//{{AFX_DATA(CCaptureDlg) DkDw>Nx<rs
enum { IDD = IDD_CAPTURE_DIALOG }; jz{(q;
CComboBox m_Key; x?%rx}h
BOOL m_bControl; pi^^L@@d
BOOL m_bAlt; 3C>2x(]M
BOOL m_bShift; 5u'TmLuKT
CString m_Path; i0,%}{`
CString m_Number; g2+l@$W
//}}AFX_DATA RY\{=f
// ClassWizard generated virtual function overrides ExNj|*
//{{AFX_VIRTUAL(CCaptureDlg) RnMB Gxa
public: ~bQFk?ZN+
virtual BOOL PreTranslateMessage(MSG* pMsg); 2(c<U6#C'l
protected: a"`g"ZRx
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Vpug"aR&_
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4?9soc
//}}AFX_VIRTUAL &,W_#l{
// Implementation }ZEfT]
protected: k)H[XpM
HICON m_hIcon; YWt"|
// Generated message map functions el <<D
//{{AFX_MSG(CCaptureDlg) 1_Dn?G^H
virtual BOOL OnInitDialog(); i1b4 J
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S[W9G)KWp
afx_msg void OnPaint(); Eg@R[ ^T
afx_msg HCURSOR OnQueryDragIcon(); [47K7~9p
virtual void OnCancel(); J{nyo1A
afx_msg void OnAbout(); #JJp:S~`
afx_msg void OnBrowse(); A2g"=x[1@K
afx_msg void OnChange(); AIvL#12
//}}AFX_MSG ,omp F$%
DECLARE_MESSAGE_MAP() tz\+'6NpOb
}; w5dIk]T
#endif n:5O9,umZ
hRuo,FS#:
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f_i"/xC-/
#include "stdafx.h" xZ9}8*Q&:
#include "Capture.h" %\(y8QV
#include "CaptureDlg.h" 9B!im\]O
#include <windowsx.h> )8 "EI-/.
#pragma comment(lib,"hook.lib") ()@.;R.Z
#ifdef _DEBUG GL;x:2XA
#define new DEBUG_NEW <
"L){$
#undef THIS_FILE Sy+]SeF&
static char THIS_FILE[] = __FILE__; Dyouk+08x
#endif "Cyo<|
#define IDM_SHELL WM_USER+1 P`Hd*xh".j
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b2/N H1A
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #.\,y>`
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _e:5XQ
class CAboutDlg : public CDialog j,|1y5f
{ 6mI_Q2
public: Oi
kU$~|
CAboutDlg(); !
kOl$!X4
// Dialog Data zulf%aaL
//{{AFX_DATA(CAboutDlg) F653[[eQ
enum { IDD = IDD_ABOUTBOX }; hVT=j ?~
//}}AFX_DATA TzevC$m;z
// ClassWizard generated virtual function overrides T}w*K[z
$
//{{AFX_VIRTUAL(CAboutDlg) X>6~{3
protected: Y6;0khp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U2[3S\@
//}}AFX_VIRTUAL _M"$5
T
// Implementation ld!6|~0U
protected: ~P]HG;$?n
//{{AFX_MSG(CAboutDlg) 9p[W :)P4d
//}}AFX_MSG S0Bl?XsD_
DECLARE_MESSAGE_MAP() t'=~"?T/o
}; (1elF)
+}(B856+
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) uZ0 $s$
{ =qS^Wz.
//{{AFX_DATA_INIT(CAboutDlg) 3f:1D=f
//}}AFX_DATA_INIT .~A"Wyu\
} t7!>5e)C}
<SC|A|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Pv2nV!X6
{ 2ucF(^
CDialog::DoDataExchange(pDX); {Jw<<<G
//{{AFX_DATA_MAP(CAboutDlg) QzFv ;
//}}AFX_DATA_MAP uu@'02G8
} qh(-shZ4Du
/H;kYx
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]!tYrSM!
//{{AFX_MSG_MAP(CAboutDlg) Za:BJ:
// No message handlers "mP*}VF
//}}AFX_MSG_MAP ,[ J'!NC1
END_MESSAGE_MAP() B'gk/^6$eg
wh7a|
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @'<j!CqQ
o
: CDialog(CCaptureDlg::IDD, pParent) bZOy~F|
{ li_pM!dWU_
//{{AFX_DATA_INIT(CCaptureDlg) l LD)i J1
m_bControl = FALSE; SVs~,
m_bAlt = FALSE; VrGb;L'[
m_bShift = FALSE; 0Li'a{n 2
m_Path = _T("c:\\"); 5.K$
X$+7}
m_Number = _T("0 picture captured."); &v9PT!R~
nCount=0; Fx88R!
bRegistered=FALSE; 8apKp?~yW
bTray=FALSE; w6In{uO-Z
//}}AFX_DATA_INIT #<i><EG
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O->(9k <
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &CeF^
} MoR-8vnJ
! lN a`
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7F9g:r/^
{ R
EH&kcn
CDialog::DoDataExchange(pDX); `~+a=Q
//{{AFX_DATA_MAP(CCaptureDlg) ttq< )4
DDX_Control(pDX, IDC_KEY, m_Key); 6k=Wt7C
DDX_Check(pDX, IDC_CONTROL, m_bControl); ,N|R/Vk$+E
DDX_Check(pDX, IDC_ALT, m_bAlt); yb.|7U?/x
DDX_Check(pDX, IDC_SHIFT, m_bShift); [BR}4(7
DDX_Text(pDX, IDC_PATH, m_Path); b=
ec?n #7
DDX_Text(pDX, IDC_NUMBER, m_Number); ?NzeP?g
//}}AFX_DATA_MAP *2C79hi1
} `::'UfHc
j nA_!;b
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {2*l :'
//{{AFX_MSG_MAP(CCaptureDlg) Q2pboZ86
ON_WM_SYSCOMMAND() n6UU6t{
ON_WM_PAINT() V?z{UZkR
ON_WM_QUERYDRAGICON() -%gd')@SfD
ON_BN_CLICKED(ID_ABOUT, OnAbout) wOkJ:k
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M"l rwun^
ON_BN_CLICKED(ID_CHANGE, OnChange) ;Owu:}
//}}AFX_MSG_MAP wp GnS
END_MESSAGE_MAP()
M9jo<+
(?3\.tQ}}
BOOL CCaptureDlg::OnInitDialog() yy.:0:ema
{ {1U*:@j
CDialog::OnInitDialog(); |laKntv 2
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z2q5f:d8
ASSERT(IDM_ABOUTBOX < 0xF000); ~
2oP,
CMenu* pSysMenu = GetSystemMenu(FALSE); ]S aH/$
if (pSysMenu != NULL) G$`4.,g
{ ?BvI/H5d
CString strAboutMenu; e^_@^(||!6
strAboutMenu.LoadString(IDS_ABOUTBOX); =(5GU<}
if (!strAboutMenu.IsEmpty()) gWH9=%!
{ f\r4[gU@
pSysMenu->AppendMenu(MF_SEPARATOR); g E+OQWu
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %
j{pz
} dq/?&X
} RW^ v {'o
SetIcon(m_hIcon, TRUE); // Set big icon |(v=1#i
SetIcon(m_hIcon, FALSE); // Set small icon JwVC?m).
m_Key.SetCurSel(0); i*w-Q=
RegisterHotkey(); oYErG],
CMenu* pMenu=GetSystemMenu(FALSE); 2Wf qgR[3
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); at]Q4
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }v,P3
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2]*~1d
return TRUE; // return TRUE unless you set the focus to a control U (7P X`1
} 2e@\6l,!^
#%tL8/K*
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &'\+Z
{ 0-f-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ua-|4@YO
{ n(S-F g
CAboutDlg dlgAbout; Jc^ozw
dlgAbout.DoModal(); Vn;]''_
} F|{?GV%hF
else 08jQq#
{ j/|qge4
CDialog::OnSysCommand(nID, lParam); Lb 4!N`l
} Mg/2w
} ofCP>Z-
B*N 8:u
void CCaptureDlg::OnPaint() KL~sEli
{ {z_pL^S'52
if (IsIconic()) YU(x!<Z
{ ?=rh= #
CPaintDC dc(this); // device context for painting sH: &OaA
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %&(\dt&R1h
// Center icon in client rectangle 6I![5j
int cxIcon = GetSystemMetrics(SM_CXICON); t[,\TM^h}0
int cyIcon = GetSystemMetrics(SM_CYICON); GefgOlg5"
CRect rect; %*=FLtBjo
GetClientRect(&rect); )6WU&0>AU8
int x = (rect.Width() - cxIcon + 1) / 2; J?$uNlI
int y = (rect.Height() - cyIcon + 1) / 2; ,#Y".23G
// Draw the icon M
-TK
dc.DrawIcon(x, y, m_hIcon); J1t?Qj;f3
} &pl;U\dc*a
else c[q3O**
{ &>{L"{
CDialog::OnPaint(); HjD= .Q
} e(A&VIp
} t[~i})yS
2Y{9Df
HCURSOR CCaptureDlg::OnQueryDragIcon() Elx bHQj6
{ 0IuU4h5Fr
return (HCURSOR) m_hIcon; -tZb\4kh
} +.St"f/1
C%"@|01cO
void CCaptureDlg::OnCancel() me" <+6
{ P)
#rvTDRw
if(bTray) 5T`39[Fya
DeleteIcon(); L^}kwu#
CDialog::OnCancel(); b-XBs7OAx
} 9AaixI
i8F~$6C
void CCaptureDlg::OnAbout() UQy+&;#5
{ B}.ia_&DLR
CAboutDlg dlg; /hHD\+0({
dlg.DoModal(); EBm\rM8
} xi0&"?7la
'1aOdEZA*
void CCaptureDlg::OnBrowse() S5vJC-"
{ JaEyVe
CString str; )`a R?_
BROWSEINFO bi; yL1\V7GI{[
char name[MAX_PATH]; (RF6K6~
ZeroMemory(&bi,sizeof(BROWSEINFO)); ):\L#>:w
bi.hwndOwner=GetSafeHwnd(); eZHi6v)i
bi.pszDisplayName=name; F6Ixu_s
bi.lpszTitle="Select folder"; bbnAmZ
bi.ulFlags=BIF_RETURNONLYFSDIRS; &o(?
}W
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~ lS3+H
if(idl==NULL) TG($l2
return; 3ul
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));
aG!!z>
str.ReleaseBuffer(); pn)5neX{
m_Path=str; \AG,dMS
if(str.GetAt(str.GetLength()-1)!='\\') f7L |Jc
m_Path+="\\"; f3O3pIA
UpdateData(FALSE); zuOIos
} ITTC}
>2$M~to"1
void CCaptureDlg::SaveBmp() CUoMB r
{ ,}[,]-nVx
CDC dc; [}Nfs3IlBw
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ) ":~`Z*@
CBitmap bm; X~x]VKr/
int Width=GetSystemMetrics(SM_CXSCREEN); 'del|"h!M
int Height=GetSystemMetrics(SM_CYSCREEN); b]Jh0B~Y
bm.CreateCompatibleBitmap(&dc,Width,Height); I".r`$XZ
CDC tdc; yRAb
HG,c
tdc.CreateCompatibleDC(&dc); s)> ]'ii
CBitmap*pOld=tdc.SelectObject(&bm); jtA
Yp3M-$
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e3[N#ryt
tdc.SelectObject(pOld); 2'++G[z
BITMAP btm; C>LkU |[
bm.GetBitmap(&btm); om(#P5cSM;
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3Z`oI#-x
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *l|CrUa
BITMAPINFOHEADER bih; |_-FQ~Hf F
bih.biBitCount=btm.bmBitsPixel; yjr!8L:m
bih.biClrImportant=0; L3 &NGcd
bih.biClrUsed=0; !j- 7,
bih.biCompression=0; _M7AQ5
bih.biHeight=btm.bmHeight; K@hv[4
bih.biPlanes=1; B}:[~R'
bih.biSize=sizeof(BITMAPINFOHEADER); K }r%OOn0
bih.biSizeImage=size; mI l_
[
bih.biWidth=btm.bmWidth; -~jM=f$
bih.biXPelsPerMeter=0; J^u8d?>r
bih.biYPelsPerMeter=0; M6?* \9E
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _m@QeO'yh
static int filecount=0; f9!wO';P6
CString name; <^M`U>
name.Format("pict%04d.bmp",filecount++); z[vMO%
name=m_Path+name; ,]>Eg6B,u
BITMAPFILEHEADER bfh; Zl]\sJ1"
bfh.bfReserved1=bfh.bfReserved2=0; C8i}~x<
bfh.bfType=((WORD)('M'<< 8)|'B'); ,Xao{o(
bfh.bfSize=54+size; T*z >A
bfh.bfOffBits=54; Hl] 3F^{
CFile bf; 4e9mN~
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4"0`J
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !\CoJ.5=
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ppS,9e-
bf.WriteHuge(lpData,size); m39 `f,M
bf.Close(); T-eeYw?Yf
nCount++; ;A1pqHr
} \6*3&p
GlobalFreePtr(lpData); +
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if(nCount==1) |nB2X;K5~
m_Number.Format("%d picture captured.",nCount); EI]NOG 0
else |eJ4"OPC
m_Number.Format("%d pictures captured.",nCount); {3'z}q
UpdateData(FALSE); :FB#,AOa_
} ?> }bg
R9~%ORI#;
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Rm{S,
{ 2?#IwT'
if(pMsg -> message == WM_KEYDOWN) crUt8L-B4
{ ]k5l]JB
if(pMsg -> wParam == VK_ESCAPE) /`3<@{D
return TRUE; 0[jy
if(pMsg -> wParam == VK_RETURN) l$z\8]x
return TRUE; +U%
=
w8b
} s7#w5fe
return CDialog::PreTranslateMessage(pMsg); x)h5W+$
} XX#YiG4|J
+-1t]`9k4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q&rpW:^v
{ $xJVUV
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ J[du>1D
SaveBmp(); 5Z,^46J
return FALSE; /w$<0hH#'8
} }hv>LL
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e}D#vPaSY
CMenu pop; 9;NR
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); tgKmCI
CMenu*pMenu=pop.GetSubMenu(0); uAwT)km
{
pMenu->SetDefaultItem(ID_EXITICON); QG$LbuZ`
CPoint pt; |]w0ytL>(2
GetCursorPos(&pt); y4^6I$M7V
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xQT`sK+
if(id==ID_EXITICON) a39Kl_\
DeleteIcon(); <sE0426
{
else if(id==ID_EXIT) 8xW_N"P.>
OnCancel(); J*IC&jH:
return FALSE; -L}crQl.'c
} +pURF&Pr
LRESULT res= CDialog::WindowProc(message, wParam, lParam); X!Xl
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UEbRg =6
AddIcon(); g-q~0
return res;
QK)"-y}"g
} epqX2`!V
l_Mi'}j
void CCaptureDlg::AddIcon() =yJJq=!
{ ep* (
NOTIFYICONDATA data; n$i}r\
so
data.cbSize=sizeof(NOTIFYICONDATA); (sSMH6iCif
CString tip; )/A IfH
tip.LoadString(IDS_ICONTIP); apPn>\O
data.hIcon=GetIcon(0); $yS7u
data.hWnd=GetSafeHwnd(); EW7heIT$
strcpy(data.szTip,tip); l6IpyIex
data.uCallbackMessage=IDM_SHELL; 8pp^
w
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Q[O[,Rk
data.uID=98; `uo'w:Q
Shell_NotifyIcon(NIM_ADD,&data); #0V$KC*>
ShowWindow(SW_HIDE); B/hL
bTray=TRUE; *J&XM[t
} ~OO&%\$k
Au(zvgP
void CCaptureDlg::DeleteIcon() dP}=cZ~
{ r*'a-2Au
NOTIFYICONDATA data; !B_i~Rmg
data.cbSize=sizeof(NOTIFYICONDATA); PZmg7N
data.hWnd=GetSafeHwnd(); `&xo;Vnc
data.uID=98; ]"Z*Hq
z
Shell_NotifyIcon(NIM_DELETE,&data); cD5c&+,&I
ShowWindow(SW_SHOW); @5jJoy(mX@
SetForegroundWindow(); #
Un>g4>Rh
ShowWindow(SW_SHOWNORMAL); -F\xZ
bTray=FALSE; T5(]/v,UT
} 4
qMO@E_
OCIWQ/
P
void CCaptureDlg::OnChange() Gu?OyL
{ OW!cydA-
RegisterHotkey(); %v
0 I;t
} B@XnHh5y
UZ#Yd|'PD
BOOL CCaptureDlg::RegisterHotkey() z=C'qF`
{ S?_/Po|
UpdateData(); e%.Xya#\
UCHAR mask=0; ~u|k1
UCHAR key=0; [^sv.
if(m_bControl) v%N/mL+5L
mask|=4; Uv|z
c
if(m_bAlt) xDv5'IGBb
mask|=2; el
GP2x#:
if(m_bShift) M\\t)=q
mask|=1; ;{'{*g[
key=Key_Table[m_Key.GetCurSel()]; AfAg#75q
if(bRegistered){ =xzDpn>f
DeleteHotkey(GetSafeHwnd(),cKey,cMask); J?4aSssE
bRegistered=FALSE; ]r++YIg!j
} )Lt|]|1B{
cMask=mask; ^Qrezl&
cKey=key; IoUQ~JviA
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "o"ujQ(v
return bRegistered;
c
*<"&
} qIE e7;DO
R1$O )A}k
四、小结 :6R0=oz
2p'ujAK
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。