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:
1wU=WE(kKZ
}Olr 一、实现方法
qYDj*wqf hq]xmM?& 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:
EK:Y2WZ 4*YOFU}l #pragma data_seg("shareddata")
'?z9,oW{ HHOOK hHook =NULL; //钩子句柄
= ]WW'~ UINT nHookCount =0; //挂接的程序数目
e2qpJ4i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
,uKs>T^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
- a static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Ny]'RS- static int KeyCount =0;
J.*[gt%O| static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
3^j~~"2,w #pragma data_seg()
%GNUnr$ 'E@2I9Kj 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。
/0Rt +` 8x!+tw7 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:
:h^O{"au^ d'x<-l9 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
uDpf2(>s cKey,UCHAR cMask)
xI-=tib {
Xs{:[vRW BOOL bAdded=FALSE;
kQqBHA for(int index=0;index<MAX_KEY;index++){
MT;SRAmUr if(hCallWnd[index]==0){
y21)~ hCallWnd[index]=hWnd;
*(@L+D0N HotKey[index]=cKey;
Qx9>,e6+ HotKeyMask[index]=cMask;
N8Rm}) bAdded=TRUE;
|LX rGyk^ KeyCount++;
oV%(
37W9= break;
Y\+(rC27 }
:;" aUHU' }
'*o7_Ez-{ return bAdded;
I
rtF4ia. }
/%N31 //删除热键
EX+={U|ua$ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|V5 $'/Y {
[[";1l BOOL bRemoved=FALSE;
d ,h~u{ for(int index=0;index<MAX_KEY;index++){
2LhfXBWf if(hCallWnd[index]==hWnd){
5`1(} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Verbmeg&n hCallWnd[index]=NULL;
[ u`17hyX HotKey[index]=0;
FYx `o\ HotKeyMask[index]=0;
hLDch5J5~ bRemoved=TRUE;
7yq7a[Ra KeyCount--;
&=+cov(3 break;
WHpUjyBP }
)OW(T^>_'I }
4yJ*85e] }
v^0*{7N' return bRemoved;
NpPuh9e{ }
I,8f{T!O@" Bz+zEXBC @'AjEl:&-_ DLL中的钩子函数如下:
=Ts5\1sc> ko-,l6E LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
4it^-M {
[aS<u`/g| BOOL bProcessed=FALSE;
KHO@"+ if(HC_ACTION==nCode)
z?3t^UPW {
D\H;_k8 if((lParam&0xc0000000)==0xc0000000){// 有键松开
Y?'Krw ` switch(wParam)
x$L(!ZDh {
-s6k't case VK_MENU:
>.=v*\P MaskBits&=~ALTBIT;
p[^a4E_v break;
UFSbu5 j case VK_CONTROL:
h<0&|s*a) MaskBits&=~CTRLBIT;
<
M o break;
ABaK60.O[O case VK_SHIFT:
A||,|He~ MaskBits&=~SHIFTBIT;
'#eY4d<i]n break;
QWQJSz5 default: //judge the key and send message
V1-URC24vd break;
'>:c:Tewy }
V] 0T P# for(int index=0;index<MAX_KEY;index++){
JYw_Z*L=m if(hCallWnd[index]==NULL)
E#zLm continue;
nRHxbE}:: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<y2HzBC {
Fm#`}K_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
YwizA}a# bProcessed=TRUE;
dTrz7ayH }
e2_p7
}
MXa(Oi2Gg }
ss0`9:z else if((lParam&0xc000ffff)==1){ //有键按下
\=&F\EV switch(wParam)
|>zYUT[V {
IQ\5!e case VK_MENU:
or
qL0i MaskBits|=ALTBIT;
w.o>G2u break;
>[0t@Tu,D case VK_CONTROL:
5HC5 MaskBits|=CTRLBIT;
s1>d)2lX break;
[[7=rn}@< case VK_SHIFT:
-T=sY/O MaskBits|=SHIFTBIT;
^61;0 break;
Whl^~$+f default: //judge the key and send message
-{z<+(K!$ break;
%7hf6Xo= }
],-(YPiAD for(int index=0;index<MAX_KEY;index++){
>&YUV.mLY if(hCallWnd[index]==NULL)
gp<XTLJ@> continue;
Tf40lv+{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QAzwNXE+ {
EC/=JlL`5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
uGpLh0 bProcessed=TRUE;
:*eJ*(M }
,y gDNF }
];\XA;aOl} }
GB}!7W" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
-V=,x3Zew for(int index=0;index<MAX_KEY;index++){
6yd?xeD if(hCallWnd[index]==NULL)
afd.v$63 continue;
;nKhmcQ4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
uLrZl0%HT~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U+:Mu]97 //lParam的意义可看MSDN中WM_KEYDOWN部分
t""d^a#Dp }
[@/s! i @ }
lF~!F<^9 }
rs,:pU return CallNextHookEx( hHook, nCode, wParam, lParam );
7E;`1lh7 }
:"`1}Q C;oO=R3r 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
n7hjYNJ jRhRw; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
`:
9n
]xP BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Gk!CU"`sP &_,.*tha 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
5EL&?\e 3 ]w a8| LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
/@0 {
<=@6UPsn2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
HjZf3VwI {
w$jq2?l //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Wt!8.d}= SaveBmp();
v-}B
T+ return FALSE;
6o~g3{Ow }
g|5cO3m0' …… //其它处理及默认处理
~{q;
-& }
U[6
~ad
a yH]w(z5Z .B{:<;sa 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。
##'uekSJ UDV6 ##$ 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。
)zu m.6pT +HoCG;C{ 二、编程步骤
DiSU\?N2' 4q\gFFV4 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";
nk2H^RM^ nBzju?X)I 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
'S6JpWG1 #ib?6=sPC 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;
oPrK{flm G<`6S5J>hr 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;
_A6e|(.ll {r:5\ 5、 添加代码,编译运行程序。
S&MF; E6 T.q7~ba* 三、程序代码
EgTj
lD,;xuQ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
p`}G"DM #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
E<77Tj #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
YeB)]$'?u` #if _MSC_VER > 1000
ZP&iy$<L #pragma once
'?fGI3b~/ #endif // _MSC_VER > 1000
'WBhW5@ #ifndef __AFXWIN_H__
RzFxO #error include 'stdafx.h' before including this file for PCH
+^J;ic #endif
,OP\^ #include "resource.h" // main symbols
5~(nHCf> class CHookApp : public CWinApp
$(08!U
{
F[0~{*/|G public:
/^I!)|At CHookApp();
bxBndxl // Overrides
HqV4!o9' // ClassWizard generated virtual function overrides
H`Zg-j` //{{AFX_VIRTUAL(CHookApp)
xo n^=Wo; public:
No+BS%F5 virtual BOOL InitInstance();
qzLD virtual int ExitInstance();
*A")A.R //}}AFX_VIRTUAL
De>,i%`Q,D //{{AFX_MSG(CHookApp)
r?^L/HGc // NOTE - the ClassWizard will add and remove member functions here.
ymnK `/J!Q // DO NOT EDIT what you see in these blocks of generated code !
9y} J|z //}}AFX_MSG
*KU:D Y{ DECLARE_MESSAGE_MAP()
osLEH?iKW };
CDr0QM4k:. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
eu$"GbqY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Nd@/U
c BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{!wd5C@ BOOL InitHotkey();
1:./f|m BOOL UnInit();
-*-"kzgd #endif
u09D`QPP] 62G%.'7 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Q7UQwAN' #include "stdafx.h"
Gf9O\wrs #include "hook.h"
-$@'@U #include <windowsx.h>
ou]jm=4[ #ifdef _DEBUG
&Wk:>9]Jrb #define new DEBUG_NEW
ORXH<;^0y #undef THIS_FILE
pE0@m-p static char THIS_FILE[] = __FILE__;
}/IP\1bG #endif
~*~aFf5 #define MAX_KEY 100
sqRvnCD! #define CTRLBIT 0x04
^?A>)?Sq #define ALTBIT 0x02
hQvI} #define SHIFTBIT 0x01
ltkA7dUbu #pragma data_seg("shareddata")
.R@XstQ
HHOOK hHook =NULL;
i~5'bSqc UINT nHookCount =0;
GW7+# static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
qzSm]l?z static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
hVJ}EF0 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
(&_^1 static int KeyCount =0;
B&EUvY ' static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
UjyrmQf #pragma data_seg()
@B ?'Mu* HINSTANCE hins;
fN9uSnu
void VerifyWindow();
Fa{[kJ8z BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
0a,B&o1 //{{AFX_MSG_MAP(CHookApp)
yD0DPtti // NOTE - the ClassWizard will add and remove mapping macros here.
y`7b3*P // DO NOT EDIT what you see in these blocks of generated code!
x4(8
=&Z //}}AFX_MSG_MAP
B3pjli END_MESSAGE_MAP()
CI-1>= "OE %'X~9Pvi CHookApp::CHookApp()
~FQHT?DAo {
mkhWbzD'S // TODO: add construction code here,
q!W=U8` // Place all significant initialization in InitInstance
-2(?O`tZ }
'1(6@5tyWk JPHM+3v CHookApp theApp;
L|L|liWd LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
z~==7:Os {
SUv'cld BOOL bProcessed=FALSE;
C"$~w3A k if(HC_ACTION==nCode)
BzS\p3& {
$7W5smW/ if((lParam&0xc0000000)==0xc0000000){// Key up
uE<8L(*B switch(wParam)
cGR) $: {
"LJV}L case VK_MENU:
{bR2S&=OmK MaskBits&=~ALTBIT;
KVr9kcs break;
^*.+4iHx case VK_CONTROL:
~#i2reG5 MaskBits&=~CTRLBIT;
:U *8S\$ break;
\I-e{'h case VK_SHIFT:
a+\<2NXYD MaskBits&=~SHIFTBIT;
R\XS5HOE( break;
m Rm}7p default: //judge the key and send message
e&*b{>1* break;
7qZC+x6_L }
^<;CIXo for(int index=0;index<MAX_KEY;index++){
xm1' if(hCallWnd[index]==NULL)
$(+xhn(O continue;
#oFyi @U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
93:oXyFjD {
D[?;+g/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
lM}-'8tt? bProcessed=TRUE;
v|\#wrCT? }
)Tp"l"(G }
l qwy5# }
bJ2>@|3* else if((lParam&0xc000ffff)==1){ //Key down
%p$XK(6 switch(wParam)
sW'_K.z {
>j3':>\U case VK_MENU:
9<&M~(dwT4 MaskBits|=ALTBIT;
K;WQV, break;
iETUBZ case VK_CONTROL:
cm_5,wB(w MaskBits|=CTRLBIT;
4L ]4WVc break;
F[SZwMf29 case VK_SHIFT:
c*. MaskBits|=SHIFTBIT;
Y]KHCY break;
>
Xh=P% default: //judge the key and send message
`2LmLFkb break;
'*65j }
s~2o<# for(int index=0;index<MAX_KEY;index++)
/RMtCa~ {
.r{t&HO;Y if(hCallWnd[index]==NULL)
&fW;;> continue;
`P'{HT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
nwz}&nR {
'c#ZW|A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
F*WWv&\X bProcessed=TRUE;
l\8l.xP }
ye U4,Ko }
!Xt=+aKN }
+nKxSjqI if(!bProcessed){
NJ-cP m for(int index=0;index<MAX_KEY;index++){
fT.5@RR7^ if(hCallWnd[index]==NULL)
=dbLA ,z9 continue;
rn1FCJ<;H if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
-0| '{ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
m{gK<T }
'Mjbvh4 }
:SSlUl4sU$ }
:xd&V%u` return CallNextHookEx( hHook, nCode, wParam, lParam );
>gDsjHQ6; }
x@bZ((w zk]6|i$!I BOOL InitHotkey()
~..h= {
Z2B59,I if(hHook!=NULL){
.a:Oj3=0 nHookCount++;
<wTkPErUG return TRUE;
,)+O.Lf7&. }
7<{Zq8) else
&Qghm o hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
hD\C[C, if(hHook!=NULL)
nM8aC&Rd\ nHookCount++;
GpF, =: return (hHook!=NULL);
NW=j>7 }
;D]TPBE BOOL UnInit()
Bd m<<< {
]\P if(nHookCount>1){
`A80""y:M nHookCount--;
K@*m6) return TRUE;
_*Vq1D ]C }
-tx)7KV- BOOL unhooked = UnhookWindowsHookEx(hHook);
fE)+9! if(unhooked==TRUE){
UR-e'Z&] nHookCount=0;
#.}Su+XF hHook=NULL;
I}Q3B3Byg }
c#9 zw[y-L return unhooked;
KnZm(c9+ }
!0`ZK-nA6 ak7kb7 5o BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2]1u0-M5L {
#l ZK_N|1x BOOL bAdded=FALSE;
V(_1q for(int index=0;index<MAX_KEY;index++){
>!6|yk`GJ if(hCallWnd[index]==0){
[% C,&h5 hCallWnd[index]=hWnd;
<
Hkq HotKey[index]=cKey;
N ai5!_' HotKeyMask[index]=cMask;
tLBtE!J$[ bAdded=TRUE;
HcgvlFb KeyCount++;
XEgJ7h_ break;
MfP)Pk5 }
z@yTkH_ }
`PC9t)%.pV return bAdded;
*!%lBt{2 }
|@vkQ
_p^"l2%D/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Zge(UhZ {
H/c
(m|KK BOOL bRemoved=FALSE;
X_]rtG for(int index=0;index<MAX_KEY;index++){
yd).}@ if(hCallWnd[index]==hWnd){
nN\H'{Wzd if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
D7;9D*o\ hCallWnd[index]=NULL;
<7M-?g:vj HotKey[index]=0;
<eoie6@3 HotKeyMask[index]=0;
aYWWln bRemoved=TRUE;
[ QiG0D_'= KeyCount--;
z3Q&O$5\ break;
)h8}{* }
}d<R
5 }
)S
caT1I }
]mTBD<3\ return bRemoved;
0f^{Rp6 }
fSkDD>& =V[uXm void VerifyWindow()
[={mCGU {
rO'DT{Yt for(int i=0;i<MAX_KEY;i++){
!sb r!Qt if(hCallWnd
!=NULL){ \84t\jKR
if(!IsWindow(hCallWnd)){
<kak9
6A
hCallWnd=NULL; kAki9a(=!
HotKey=0; 1~5DIU^
HotKeyMask=0; n0xGIq
KeyCount--; qCV<-o
} ,`@pi@<"#
} 'X^auyL
} 04X/(74
} SrdCLT8
9-=kVmT&g
BOOL CHookApp::InitInstance() C91'dM
{ +q432ZG
AFX_MANAGE_STATE(AfxGetStaticModuleState()); rUB67ok*
hins=AfxGetInstanceHandle(); >I/~)B`jhE
InitHotkey(); #zn`)n
return CWinApp::InitInstance(); Y$hLsM\%
} <HW2W"Go\
=p8iYtI
int CHookApp::ExitInstance() cn_KHz=
{ YMwL(m1
VerifyWindow(); #@M'*X_%}K
UnInit();
Es:oXA
return CWinApp::ExitInstance(); |JUAR{
} G>2: WQ/
SzjylUYV
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,f~8:LHq
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cbx(
L8
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fdKTj
=4
#if _MSC_VER > 1000 eGrxS;NY
#pragma once p!LaR.8]
#endif // _MSC_VER > 1000 bXWodOSN
7TGLt z
class CCaptureDlg : public CDialog ]bb`6 \h
{ -D30(g{O
// Construction !T8h+3I
public: D4CiB"g3*
BOOL bTray; "':u#UdS
BOOL bRegistered; 9"mcN3x:\e
BOOL RegisterHotkey(); "G
@(AE(
UCHAR cKey; Lr`G. e
UCHAR cMask; \ HZ]=B#0
void DeleteIcon(); h;8^vB y
void AddIcon(); JRl`evTS
UINT nCount; 75t5:>"[
void SaveBmp(); ZAcW@xfb
CCaptureDlg(CWnd* pParent = NULL); // standard constructor X`FFI6pb
// Dialog Data ")ZsY9-P
//{{AFX_DATA(CCaptureDlg) 00)=3@D
enum { IDD = IDD_CAPTURE_DIALOG }; F`\7&'I
CComboBox m_Key; aI0}E O
BOOL m_bControl; D%k]D/
BOOL m_bAlt; wst)O{ 4
BOOL m_bShift; 9&uWj'%ia
CString m_Path; 6S2v3
CString m_Number; .TTXg,8#D
//}}AFX_DATA AmmUoS\
// ClassWizard generated virtual function overrides 27!9LU
//{{AFX_VIRTUAL(CCaptureDlg) O*7Gl G
public: L=wg"$
virtual BOOL PreTranslateMessage(MSG* pMsg); ?3
l4U
protected: 5+[`x']l
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GGR hM1II
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tu6Q7CjW8
//}}AFX_VIRTUAL 'YcoF;&[C
// Implementation +u:Q+PkM
protected: {|~22UkF[V
HICON m_hIcon; <U ?_-0
// Generated message map functions i;
3^vhbQ
//{{AFX_MSG(CCaptureDlg) g
:me:M
virtual BOOL OnInitDialog(); -gpF%g`H
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?u9JRXj%
afx_msg void OnPaint(); naT;K0T=
afx_msg HCURSOR OnQueryDragIcon(); W 6m
oFn
virtual void OnCancel(); Ux Yb[Nbc
afx_msg void OnAbout(); u~9gR @e2{
afx_msg void OnBrowse(); ag$mc8-p[
afx_msg void OnChange(); 7EKQE>xj
//}}AFX_MSG ~#b&UR
DECLARE_MESSAGE_MAP() P'4jz&4
}; )NwIEk>Tf
#endif J \@yP
'}D$"2I*
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~fE6g3
#include "stdafx.h"
j'V# =vH
#include "Capture.h" V.RG=TVS
#include "CaptureDlg.h" C>vp
oCA
#include <windowsx.h> + W ?
/A]
#pragma comment(lib,"hook.lib") JZ5NQ)sX
#ifdef _DEBUG _[,oP s:+
#define new DEBUG_NEW 8yH*
#undef THIS_FILE ' ju{j`b
static char THIS_FILE[] = __FILE__; S;vE%
#endif :Qg3B ';
#define IDM_SHELL WM_USER+1 5ap~;t
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /(?s\}O
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nFWiS~(#sW
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; IyM:9=}5
class CAboutDlg : public CDialog 2XEE/]^
{ qj4jM7
public: Ug384RzHN
CAboutDlg(); `2]TPaWGh
// Dialog Data R7KV
@n
//{{AFX_DATA(CAboutDlg) ]]e>Jym
enum { IDD = IDD_ABOUTBOX }; skU
}BUK6
//}}AFX_DATA 4dm0:,
G
// ClassWizard generated virtual function overrides [KCR@__
//{{AFX_VIRTUAL(CAboutDlg) ^Pah\p4bj
protected: m/;fY>}3
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V(g5Gn?
//}}AFX_VIRTUAL 3E0C$vKM
// Implementation nB0KDt_
protected: l%p,m[
//{{AFX_MSG(CAboutDlg) H7k@Br
//}}AFX_MSG RS#C4NG
DECLARE_MESSAGE_MAP() >
6=3y4tP
}; 0{XT#H
6 !N2B[9
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sXNb
{ =LgMG^@mu
//{{AFX_DATA_INIT(CAboutDlg) mD|Q+~=|e
//}}AFX_DATA_INIT OJh MM-
} ;]bW
BR_fOIDc
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <_]W1V:0
{ $My~sN8
CDialog::DoDataExchange(pDX); n&DBMU
//{{AFX_DATA_MAP(CAboutDlg) 6L)7Q0Z
//}}AFX_DATA_MAP E}THG=6
} YK5(o KFN
jc\y{ I\
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g++-v HD
//{{AFX_MSG_MAP(CAboutDlg) {wgq>cb
// No message handlers VvT7v]
//}}AFX_MSG_MAP IYHNN
END_MESSAGE_MAP() Z[B:6\oQ
>_ G'o
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) a*:GCGe
: CDialog(CCaptureDlg::IDD, pParent) e,Y<$kPV
{ ?RW1%+[
//{{AFX_DATA_INIT(CCaptureDlg) C\vOxBAB
m_bControl = FALSE; u^#e7u
m_bAlt = FALSE; T LF'7ufq
m_bShift = FALSE; B(5>H2
m_Path = _T("c:\\"); z-:>[Sn
m_Number = _T("0 picture captured."); 2@@evQ
nCount=0; FjLMN{eH/
bRegistered=FALSE; BjA$^ i|8
bTray=FALSE; wh2E$b(-
//}}AFX_DATA_INIT |`s:&<W+kp
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4tx6h<L#s
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z.?slYe[
} 2 )3oX
1kR. .p<"
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '?g&);4)k-
{ uh \Tf5
CDialog::DoDataExchange(pDX); iyXd"O
//{{AFX_DATA_MAP(CCaptureDlg) ^7Z;=]8J
DDX_Control(pDX, IDC_KEY, m_Key); w0vsdM;G
DDX_Check(pDX, IDC_CONTROL, m_bControl); o[i*i<jv-
DDX_Check(pDX, IDC_ALT, m_bAlt); L
4Z+8*
DDX_Check(pDX, IDC_SHIFT, m_bShift); 5UG9&:zu'V
DDX_Text(pDX, IDC_PATH, m_Path); ,KU%"{6
DDX_Text(pDX, IDC_NUMBER, m_Number); 'GiN^Y9dcc
//}}AFX_DATA_MAP jzBW'8
} t1yOAbI
KWAd~8,mk
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lnm@DWhf
//{{AFX_MSG_MAP(CCaptureDlg) }^j8<
ON_WM_SYSCOMMAND() 99CK [G
ON_WM_PAINT() 'cQ,;y
ON_WM_QUERYDRAGICON() ?mSZQF:d@
ON_BN_CLICKED(ID_ABOUT, OnAbout) foL4s;2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }pnp._j
ON_BN_CLICKED(ID_CHANGE, OnChange) _VTpfeL@n
//}}AFX_MSG_MAP } # L_R
END_MESSAGE_MAP() 5X>~39(r
kqxq'Aq)d
BOOL CCaptureDlg::OnInitDialog() B& R?{y*
{ UUb0[oy
CDialog::OnInitDialog(); CDsl)
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I,HtW ),
ASSERT(IDM_ABOUTBOX < 0xF000); !$>b}w'
CMenu* pSysMenu = GetSystemMenu(FALSE); @!O(%0
=
if (pSysMenu != NULL) X(rXRP#
{ * fj`+J
CString strAboutMenu; ~TeOl|!lE+
strAboutMenu.LoadString(IDS_ABOUTBOX); 5MD'AP:
if (!strAboutMenu.IsEmpty()) -.ZP<,?@F
{ b18f=<#
pSysMenu->AppendMenu(MF_SEPARATOR); /!A"[Tyt
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); r<Cr)%z!
} 4cM0f,nc+
} a?8)47)
SetIcon(m_hIcon, TRUE); // Set big icon l^B4.1rT
SetIcon(m_hIcon, FALSE); // Set small icon z,7;+6*=L
m_Key.SetCurSel(0); 0Q?%B6g$m[
RegisterHotkey(); ZH8 w^}
CMenu* pMenu=GetSystemMenu(FALSE); zUZET'Bm9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b4bd^nrqV
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b6sf1E
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _~ei1
G.R
return TRUE; // return TRUE unless you set the focus to a control W*#5Sk
} ~gGkw#
q(^iT~}
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o$Nhx_F
{ 9p3~WA/M@
if ((nID & 0xFFF0) == IDM_ABOUTBOX) VwZ~ntk
{ K[0z$T\
CAboutDlg dlgAbout; U;t1 K
dlgAbout.DoModal(); -lm)xpp1
} rG3?Z^&R+
else vL8Rg} Jh4
{ 3?
F~H
CDialog::OnSysCommand(nID, lParam); DcN!u6sJ
} c/E'GG%Q%
} k5)a|
yX/{eX5dr
void CCaptureDlg::OnPaint() 3!vnSX(iv
{ *auT_*
if (IsIconic()) fGoJP[ae
{ 0[E\h
CPaintDC dc(this); // device context for painting Q hdG(`PY~
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {@hJPK8
// Center icon in client rectangle m"!Q5[
int cxIcon = GetSystemMetrics(SM_CXICON); h.q9p!
int cyIcon = GetSystemMetrics(SM_CYICON); aNP\Q23D
CRect rect; l2ie\4dK@
GetClientRect(&rect); /}9)ZYMx
int x = (rect.Width() - cxIcon + 1) / 2; D>0(*O
int y = (rect.Height() - cyIcon + 1) / 2; tXcZl!3x
// Draw the icon AkCy
C1
dc.DrawIcon(x, y, m_hIcon); AG><5 }
} 6sG5n7E-A
else 5+yy:#J]
{ pog
CDialog::OnPaint(); WtO@Kf:3GH
} ~O|~M_Z
} #x`K4f)
kU,g=+2J
HCURSOR CCaptureDlg::OnQueryDragIcon() vo(:g6$
{ _}F_Q5)
return (HCURSOR) m_hIcon; f3S 8~!
} bo1J'pU
-[}Aka,f!
void CCaptureDlg::OnCancel() ESUO I
{ 31UxYBY
if(bTray) yzZzaYv "/
DeleteIcon(); hV:++g
CDialog::OnCancel(); AN3oh1xe:
} R+z'6&/ =I
O p1TsRm5L
void CCaptureDlg::OnAbout() m#[9F']Z`
{ P^!g0K
CAboutDlg dlg; ~!=Am:-wr
dlg.DoModal(); ~f"3Wa*\B
} r+h%a~A#>
N;,zPW a
void CCaptureDlg::OnBrowse() EIfqRRTA
{ N"1o>
!
CString str; PTrKnuM\J_
BROWSEINFO bi; ZxLd h8v.
char name[MAX_PATH]; Z:9xf:g*
ZeroMemory(&bi,sizeof(BROWSEINFO)); >zFk}/
bi.hwndOwner=GetSafeHwnd(); u0 myB/`
bi.pszDisplayName=name; .\XFhOsa
bi.lpszTitle="Select folder"; m/@ ;N,K
bi.ulFlags=BIF_RETURNONLYFSDIRS; jYDpJ##Zb
LPITEMIDLIST idl=SHBrowseForFolder(&bi); $p:RnH\H1
if(idl==NULL) "159Q
return; L/\s~*:M
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4eH:eCZze
str.ReleaseBuffer(); .8Eh[yiln
m_Path=str; vZMb/}-o
if(str.GetAt(str.GetLength()-1)!='\\') pGz 5!d
m_Path+="\\"; {Tx"G9
UpdateData(FALSE); prtNfwJz1j
} #&0G$~
NULew]:5
void CCaptureDlg::SaveBmp() 1eHU!{<fqm
{ kjAARW
CDC dc; uCkXzb9_z
dc.CreateDC("DISPLAY",NULL,NULL,NULL); s0r::yO
CBitmap bm; DO*rVs3'p[
int Width=GetSystemMetrics(SM_CXSCREEN); %Q,6 sH#
int Height=GetSystemMetrics(SM_CYSCREEN); `C pfQP&^
bm.CreateCompatibleBitmap(&dc,Width,Height); atr0hmQ
CDC tdc; 7v'aw"~
tdc.CreateCompatibleDC(&dc); #aI(fQZe
CBitmap*pOld=tdc.SelectObject(&bm); 7R5m|h`M
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X~UrAG}_
tdc.SelectObject(pOld); ~mBY_[_s=
BITMAP btm; X$r5KJU
bm.GetBitmap(&btm); ~jz!jF~I
DWORD size=btm.bmWidthBytes*btm.bmHeight; R+sv? 4k
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,9,cN-/a
BITMAPINFOHEADER bih; z
}3 `9
bih.biBitCount=btm.bmBitsPixel; <JUumrEo
bih.biClrImportant=0; ;Mw<{X-
bih.biClrUsed=0; %CoO-1@C
bih.biCompression=0; ._%8H
bih.biHeight=btm.bmHeight; +{~cX]|
bih.biPlanes=1; "+XF'ZO
bih.biSize=sizeof(BITMAPINFOHEADER); w{8O$4
w
bih.biSizeImage=size; y^0
mf|
bih.biWidth=btm.bmWidth; ^O0trM>h-
bih.biXPelsPerMeter=0; ?,}:)oA_
bih.biYPelsPerMeter=0; [n]C
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8u%rh[g'
static int filecount=0; P*|qbY
CString name; t
$m:
name.Format("pict%04d.bmp",filecount++); q}PUwN6
name=m_Path+name; w`GjQIA
BITMAPFILEHEADER bfh; *epK17i=
bfh.bfReserved1=bfh.bfReserved2=0; Tuz~T
_M
bfh.bfType=((WORD)('M'<< 8)|'B'); Y sDai<
bfh.bfSize=54+size; %9!,PeRe
bfh.bfOffBits=54; L:ox$RU
CFile bf; R>iRnrn:-
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |KHaL?
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -<[MM2Y
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M[^
bf.WriteHuge(lpData,size); ,u1Yn}
bf.Close(); ;p!|E3o.
nCount++; J.r^"K\
} gxIGL-1M
GlobalFreePtr(lpData); bV5 {
if(nCount==1) LK}Ih@f
m_Number.Format("%d picture captured.",nCount); XvU^DEfW
else Stkyz:,(
m_Number.Format("%d pictures captured.",nCount); K\7\
UpdateData(FALSE); .K=r.tf~
} L"|~,SVF
&p)]Cl/`
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =r3 %jWH6
{ a5/6DK>
if(pMsg -> message == WM_KEYDOWN) OO Hw-MW
{ mIK-a{?G
if(pMsg -> wParam == VK_ESCAPE) F%t_9S,)O
return TRUE; Df\~ ZWs!
if(pMsg -> wParam == VK_RETURN) J|9kWjOf+i
return TRUE; }9k/Y/.
} M7O5uW`
return CDialog::PreTranslateMessage(pMsg); eF[CiO8F2
} yMU>vr
rqp]{?33
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 21Dc.t{
{ w-R.)
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _OjZ>j<B.
SaveBmp(); nhMxw@ Z\
return FALSE; co\Il]`R/
} '
=5B
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !&b|
[b
CMenu pop; 8!.V`|@lt
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); djnES,^%9
CMenu*pMenu=pop.GetSubMenu(0); #C.
pMenu->SetDefaultItem(ID_EXITICON); .hG*mXw>
CPoint pt; sG_/E-%5'
GetCursorPos(&pt); XC;Icr)
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {Ak
4G L
if(id==ID_EXITICON) 'oY#a9~Z{
DeleteIcon(); KiI+ V;o
else if(id==ID_EXIT) ORF:~5[YS`
OnCancel(); @.i#uMWF`
return FALSE; vR!g1gI23
} 45wtl/^9
LRESULT res= CDialog::WindowProc(message, wParam, lParam); L~;(M6Jp
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) h/|p`MP\1
AddIcon(); Z|x|8 !D
return res; z7AWWr=H
} eZU9L/w:
>O24#!9XW
void CCaptureDlg::AddIcon() /; Bmh=
{ D@68_sn
NOTIFYICONDATA data; h
':ZF
data.cbSize=sizeof(NOTIFYICONDATA); |]@Pq[Hn|
CString tip; 4L8hn4F
tip.LoadString(IDS_ICONTIP); r)}U
'iv*%
data.hIcon=GetIcon(0); HBOyiIm Q
data.hWnd=GetSafeHwnd(); xIa7F$R 0
strcpy(data.szTip,tip); kO3\v)B;
data.uCallbackMessage=IDM_SHELL; lcm[l
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PgK7CG7G
data.uID=98; W +ER'lX
Shell_NotifyIcon(NIM_ADD,&data); ; iia?f1
ShowWindow(SW_HIDE); }}tbOD)t
bTray=TRUE; 7LVG0A2>7
} xH*X5?
lh"*$.j-
void CCaptureDlg::DeleteIcon() \_8wU'7
{ I6f/+;E
NOTIFYICONDATA data; 2NMs-Zs
data.cbSize=sizeof(NOTIFYICONDATA); iI IXv
data.hWnd=GetSafeHwnd(); 6ABK)m-y
data.uID=98; _#:/ ~Jp
Shell_NotifyIcon(NIM_DELETE,&data); MHK|\Z&e7
ShowWindow(SW_SHOW); XhM!pSl\
SetForegroundWindow(); ,?|$D Y+=
ShowWindow(SW_SHOWNORMAL); -<6?ISF2
bTray=FALSE; <R /\nY Xz
} ;cI*"-I:F
[ncK+rGAc
void CCaptureDlg::OnChange() , [|aWT%9
{ be,Rj,-
RegisterHotkey(); O[C4xq
} >SK:b/i
9dhEQ=K{3
BOOL CCaptureDlg::RegisterHotkey() Q# B0JT1
{ rKrHd
UpdateData(); e(?w h
UCHAR mask=0; 8#7qHT;cx
UCHAR key=0; ",$_\l
if(m_bControl) :D) (3U5
mask|=4; V]p{jLG
if(m_bAlt) fgdR:@]-
mask|=2; aaR& -M@
if(m_bShift)
-BSdrP|
mask|=1; =n5'~1?X?
key=Key_Table[m_Key.GetCurSel()]; pUXoSnIq:
if(bRegistered){ Cd}^&z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); RXWdqaENx
bRegistered=FALSE; E9.1~
)
} 0|\JbM
cMask=mask; a[=B?Bd
cKey=key; >FFp"%%
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |c$*Fa"A
return bRegistered; z`J-J*R>d
} )C$Ij9<A
&`"uKO]
四、小结 Y}\3PaUa
>
JTf0/
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。