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:
N
,'GN[s
xjuN- 一、实现方法
n/;WxnnQ ]_mb7X> 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:
lk^Ol&6 ~:rl=o } #pragma data_seg("shareddata")
k$z_:X HHOOK hHook =NULL; //钩子句柄
(Y.k8";)` UINT nHookCount =0; //挂接的程序数目
1b `1{% static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
~ drS} V static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
zH?! static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
jH5
k static int KeyCount =0;
l[mWf static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Gv!2f #pragma data_seg()
6"LcJ%o EnKR%Ctw 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
_UMg[Um 8\@m
- E!{ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
:}L[sl\R ajbA\/\G; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
'%s.^kn cKey,UCHAR cMask)
acajHs {
[i21FX BOOL bAdded=FALSE;
`quw9j9`C\ for(int index=0;index<MAX_KEY;index++){
zsEc( if(hCallWnd[index]==0){
9|^2",V hCallWnd[index]=hWnd;
>a!/QMh HotKey[index]=cKey;
<$A HotKeyMask[index]=cMask;
q~b& bAdded=TRUE;
. oF
&Ff/[ KeyCount++;
|sJ[0z break;
*.ll<p+(- }
y2Q&s9$Do }
!_]Y~[ return bAdded;
d\&U*= }
[N-Di" //删除热键
e&|'I" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@wGPqg {
SB;&GHq"n BOOL bRemoved=FALSE;
G, }Yl for(int index=0;index<MAX_KEY;index++){
!fV+z%: if(hCallWnd[index]==hWnd){
Avge eJi if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
0#7>o^2 hCallWnd[index]=NULL;
n*R])=F@c HotKey[index]=0;
YquI $PV _ HotKeyMask[index]=0;
/QK6Rac- bRemoved=TRUE;
uanhr)Ys KeyCount--;
Q,,e+exbb5 break;
i^/T }
bQzZy5, }
xeg/A}yE }
)nC]5MXU return bRemoved;
lZd(emH@ }
7cuE7" WA<v9#m \#8D>i?m DLL中的钩子函数如下:
AVsDt2A JinUV6cr LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
s$zLiQF; {
$P > BOOL bProcessed=FALSE;
A6 if(HC_ACTION==nCode)
h/QXPdV {
!4ocZmj\ if((lParam&0xc0000000)==0xc0000000){// 有键松开
wm+};L&_ switch(wParam)
-mbt4w {
w1FcB$ case VK_MENU:
+r MaskBits&=~ALTBIT;
u4*BX& break;
3<e=g)F case VK_CONTROL:
Yj<a"
Gr4[ MaskBits&=~CTRLBIT;
k90YV( break;
bt@<
ut\ case VK_SHIFT:
vOH4# MaskBits&=~SHIFTBIT;
XnH05LQ break;
3p$?,0ELH default: //judge the key and send message
i7CX65&b break;
0.Q
Ujw }
%HhBt5w for(int index=0;index<MAX_KEY;index++){
pN,u`[ if(hCallWnd[index]==NULL)
+N]J5Ve-`t continue;
G~]Uk*M
q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
k`cfG\;r {
F0m-23[H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Gf%~{@7=u bProcessed=TRUE;
cRC6 s8 }
+X\FBvP& }
3xy<tqfr }
V%t.l else if((lParam&0xc000ffff)==1){ //有键按下
DcS+_>a\{l switch(wParam)
lwR<(u31e {
]]HNd7Vh case VK_MENU:
,=uD^n: MaskBits|=ALTBIT;
W Tcw4 break;
;_XFo&@ case VK_CONTROL:
h!,v/7= MaskBits|=CTRLBIT;
;gD})@ break;
%6t:(z case VK_SHIFT:
./XYd"p MaskBits|=SHIFTBIT;
Qry@
s5 break;
;'gWu default: //judge the key and send message
cQjv$$&6[ break;
nF}vw |r>x }
%J}xg^+f for(int index=0;index<MAX_KEY;index++){
*j|~$e}C if(hCallWnd[index]==NULL)
3h]g}&k continue;
mupT<_Y if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~EW(Gs!=C {
t"sBPLU\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
a6ekG YW bProcessed=TRUE;
}czrj%6 }
l&[O }
X hR4ru` }
gZVc 5u< if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&L3M] for(int index=0;index<MAX_KEY;index++){
"6A
`
q\ if(hCallWnd[index]==NULL)
{aZ0; continue;
RCJ|P~* if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
??5Q)Erm1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
g%o(+d //lParam的意义可看MSDN中WM_KEYDOWN部分
OUE(I3_ }
2y75 }
xexaQuK }
)',R[|< return CallNextHookEx( hHook, nCode, wParam, lParam );
Q;Ak4[ }
$Ph|e)p 2'l'8 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:
pR<`H' SV4E0c> BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
p;a,#IJu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
WpDSg*fk=Y aNsBcov3O 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:
7lTC{7C57 gE-tjoJ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
eNh39er {
EZgwF=lO if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
t6rRU~;} {
KA5v +~ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
_r#Z}HK SaveBmp();
qyb?49I return FALSE;
H;mSkRD3N }
%64)(z …… //其它处理及默认处理
`K"L /I9 }
v4<nI;Ux \Dm";Ay> @ 6\I~s( 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。
Q) #B0NA;T SZ7:u895E 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。
?9vuuIE m<G,[Yc 二、编程步骤
7jrt7[{ t
mntp 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";
wKh4|Ka j{ ]I]\=? 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
alJ)^OSIe 2F;y;l% 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==?g3 JBj]najN 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;
xh-o}8*n" z9f-.72"X 5、 添加代码,编译运行程序。
2g
`o ]2A^1Del 三、程序代码
;7*[Bcj. >fG3K` ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
{L971W_L #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
2YL?,uLS #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
+bxYGD #if _MSC_VER > 1000
KRbvj #pragma once
1y&\5kB #endif // _MSC_VER > 1000
@3i\%R)n; #ifndef __AFXWIN_H__
:9afg #error include 'stdafx.h' before including this file for PCH
(M|Dx\_ #endif
=HK!(C #include "resource.h" // main symbols
J`Q>3]wL class CHookApp : public CWinApp
$GV7o{"& {
3m[vXr? public:
6 3iUi9P CHookApp();
^S<Y>Nm] // Overrides
Y>z>11yEB0 // ClassWizard generated virtual function overrides
DPY}?dC //{{AFX_VIRTUAL(CHookApp)
YRk(u7:0 public:
D>r&}6< virtual BOOL InitInstance();
&A/]pi-\ virtual int ExitInstance();
0q //}}AFX_VIRTUAL
wSL}`C gU //{{AFX_MSG(CHookApp)
O^PKn_OJ // NOTE - the ClassWizard will add and remove member functions here.
G&SB- // DO NOT EDIT what you see in these blocks of generated code !
x^qVw5{n //}}AFX_MSG
OF>mF~ DECLARE_MESSAGE_MAP()
2>9C-VL2 };
.~db4d] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
X56q-| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wo}H'Q}Hj BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}v;V=%N+v BOOL InitHotkey();
'6`3(TK.a BOOL UnInit();
yf)%%& #endif
UXz<)RvB Mexk~zA^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
;a!S!%.h #include "stdafx.h"
P{`C^W$J^ #include "hook.h"
M7\szv\Zc= #include <windowsx.h>
^#-l
q) #ifdef _DEBUG
A|[?#S((] #define new DEBUG_NEW
N];NAMp #undef THIS_FILE
FZQP%]FX static char THIS_FILE[] = __FILE__;
r r %V.r;2 #endif
G>_*djUf #define MAX_KEY 100
2szPAuN+ #define CTRLBIT 0x04
lBE=(A`
#define ALTBIT 0x02
H'5)UX@LP #define SHIFTBIT 0x01
eIF5ZPSZi #pragma data_seg("shareddata")
"!P3R1;% HHOOK hHook =NULL;
%`r$g[<G UINT nHookCount =0;
5pG}Yk_(x static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
tFn)aa~L static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
n8 0?N}
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
JG.y,<xW static int KeyCount =0;
gaxsv[W>^ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
+^ac'Y)A #pragma data_seg()
P:S .~Jq HINSTANCE hins;
\w>y`\6mX void VerifyWindow();
@s&71a BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Q} JOU //{{AFX_MSG_MAP(CHookApp)
BVQqY$> // NOTE - the ClassWizard will add and remove mapping macros here.
m 0C@G5 // DO NOT EDIT what you see in these blocks of generated code!
X05/uX{ //}}AFX_MSG_MAP
/62!cp/F/D END_MESSAGE_MAP()
P5V}#;v 6wRd<]C CHookApp::CHookApp()
8nqG<!,q {
s[*rzoA // TODO: add construction code here,
#zy:a% // Place all significant initialization in InitInstance
ODN/G%l }
Wb_J(!da ~_)^X CHookApp theApp;
@;4zrzQi7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<}Vrl`?h {
7+cO_3AB BOOL bProcessed=FALSE;
C&f=
ywi0 if(HC_ACTION==nCode)
s^TZXCyF o {
Wi<m{.%\E if((lParam&0xc0000000)==0xc0000000){// Key up
'BxX0 switch(wParam)
AN m
d! {
>uB?rGcM case VK_MENU:
1\m[$Gs: MaskBits&=~ALTBIT;
]A`n(
"% break;
aKDKmHd case VK_CONTROL:
;1=1:S8 MaskBits&=~CTRLBIT;
xa*hi87L* break;
r<EY]f^`u case VK_SHIFT:
R^fPIv`q MaskBits&=~SHIFTBIT;
uMv,zO5 break;
bWS&Yk( default: //judge the key and send message
<dNOd0e break;
3`?7<YJ }
T<>,lQs(a for(int index=0;index<MAX_KEY;index++){
.43'HV if(hCallWnd[index]==NULL)
Y-z(zS^1 continue;
zI uJ-8T" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=%O6:YM
{
=I5>$}q_&, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(L:>\m&NO bProcessed=TRUE;
n&/
` }
DfD&)tsMQ }
N>1em!AS }
>|=ts else if((lParam&0xc000ffff)==1){ //Key down
H41?/U,{ switch(wParam)
ty!`T+3 {
Qel9G($= case VK_MENU:
E&w7GZNt MaskBits|=ALTBIT;
I
34>X`[o break;
a-tmq]]E case VK_CONTROL:
G.B2(' MaskBits|=CTRLBIT;
}>|s=uGW break;
y.k~Y0 case VK_SHIFT:
JR|ck=tq MaskBits|=SHIFTBIT;
1&OW4_ break;
q
i;1L
Kc default: //judge the key and send message
XT*sGM break;
v1JzP# }
~ Iuf}D; for(int index=0;index<MAX_KEY;index++)
h#*dI`>l- {
S hWJ72c if(hCallWnd[index]==NULL)
29b9`NXt continue;
e9tjw[+A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
WU`
rh^ {
cjY-y-vO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
gH vZVC[b bProcessed=TRUE;
@mBQ?;qlK }
>U>(`r* }
gD?l-RT> }
=qIp2c}Rx if(!bProcessed){
B$K=\6o for(int index=0;index<MAX_KEY;index++){
Q&;9x? e if(hCallWnd[index]==NULL)
?V=ZIGj continue;
JbbzV> if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
,0 sm SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
qDIZJh }
U)gH}0n& }
=WATyY:s }
_VN?#J)o return CallNextHookEx( hHook, nCode, wParam, lParam );
3"i-o$P }
]6`% O bS3
M BOOL InitHotkey()
!.gIHY {
ITBE|b if(hHook!=NULL){
p
l0\2e) nHookCount++;
3$R1ipb return TRUE;
e !Y~Qy }
!pW0qX\1n else
T^KKy0ZGM hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
59A}}.@?m if(hHook!=NULL)
SH$PwJ U nHookCount++;
~mxO7cy5Cg return (hHook!=NULL);
7}>E J }
ki!0^t:9 BOOL UnInit()
t*u:hex {
WT=;: j if(nHookCount>1){
~!L}yw nHookCount--;
4VSU8tK|N] return TRUE;
Sm|6 %3 }
AkV#J,
3LC BOOL unhooked = UnhookWindowsHookEx(hHook);
eMsd37J if(unhooked==TRUE){
u#.2w)!D nHookCount=0;
x;d6vBTUb hHook=NULL;
6{b>p+U }
IJ"q~r$ return unhooked;
pnOAs&QAm }
0e4{{zQx }Y\%RA BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
EQM{ {
T8g$uFo BOOL bAdded=FALSE;
i.m^/0! for(int index=0;index<MAX_KEY;index++){
5;EvNu if(hCallWnd[index]==0){
Q2gq}c~ hCallWnd[index]=hWnd;
TeM|:o HotKey[index]=cKey;
QWYJ* HotKeyMask[index]=cMask;
&QgR*,5eo bAdded=TRUE;
Rm( "=( KeyCount++;
}7Q% 6&IR break;
5b*C1HS@X }
8ib:FF(= u }
a~w$#fo"`f return bAdded;
L8B!u9% }
K|,
.C[ 1+s;FJ2} BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sgFEK[w.y {
k,*XG$2h BOOL bRemoved=FALSE;
*2l7f`K for(int index=0;index<MAX_KEY;index++){
!Vk^TFt` if(hCallWnd[index]==hWnd){
KWHY4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
7[)E>XRE hCallWnd[index]=NULL;
4WB0Pt{ HotKey[index]=0;
fJg+ Ryo HotKeyMask[index]=0;
xJe%f\UDu bRemoved=TRUE;
PW0LG^xp` KeyCount--;
oEv'dQ9 break;
Dd|VMW= }
yWSGi#)1 }
xqh }
<hyKu
return bRemoved;
GbI/4<)l} }
a7opCmL %N._w!N<5n void VerifyWindow()
'g\4O3&_ {
z$sT !QL~ for(int i=0;i<MAX_KEY;i++){
9 68Ez
if(hCallWnd
!=NULL){ Pq$n5fZC!
if(!IsWindow(hCallWnd)){ 1% ` Rs
hCallWnd=NULL; wCBplaojJ
HotKey=0; %|oym.-I6
HotKeyMask=0; }SZd
KeyCount--; 3v-~K)hl?
} Vurqt_nb
} %cn<ych
G
} dZuOrTplA
} UEL_uij
307I$*%W
BOOL CHookApp::InitInstance() KI.hy2?e
{ vY3h3o
AFX_MANAGE_STATE(AfxGetStaticModuleState()); n@3>6_^rwT
hins=AfxGetInstanceHandle(); Q>z8IlJ}
InitHotkey(); .}+}8[p4l
return CWinApp::InitInstance(); *-X[u:
} %BODkc Zh
PA*5Bk="q
int CHookApp::ExitInstance() "[N!m1i:{
{ ;tf=gdX;
VerifyWindow(); DY*N|OnqJ
UnInit(); EU#^7
return CWinApp::ExitInstance(); |7~<Is~*
} >$7B
wO
zH
r_!~
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Z\sDUJ
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]4e;RV-B
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %yC,^
#if _MSC_VER > 1000 v$9y,^p@e
#pragma once pgo$61
#endif // _MSC_VER > 1000 DmcZta8n]
8P`"M#fI
class CCaptureDlg : public CDialog eMzk3eOJ
{ K=&>t6s<
// Construction *qq+jsA6wH
public: XWw804ir
BOOL bTray; {;oPLr+Z
BOOL bRegistered; J}t%p(mb
BOOL RegisterHotkey(); :(%5:1W
UCHAR cKey; 6eCCmIdaM
UCHAR cMask; <UCl@5g&
void DeleteIcon(); dh\P4
void AddIcon(); =(^3}x
UINT nCount; +7}]E1Uf
void SaveBmp(); j<$2hiI/?&
CCaptureDlg(CWnd* pParent = NULL); // standard constructor G~m<;
// Dialog Data >Q*Wi
//{{AFX_DATA(CCaptureDlg) .+qpk*V\
enum { IDD = IDD_CAPTURE_DIALOG }; Bbc^FHip
CComboBox m_Key; d;>QhoiL
BOOL m_bControl; ~LC-[&$
BOOL m_bAlt; KPki}'GO
BOOL m_bShift; -\MG}5?!
CString m_Path; 7EJ+c${e.-
CString m_Number; Qb%J8juRf
//}}AFX_DATA I^]nqK
// ClassWizard generated virtual function overrides Vvo7C!$z
//{{AFX_VIRTUAL(CCaptureDlg) 6u%&<")4HP
public: 4M T 7 `sr
virtual BOOL PreTranslateMessage(MSG* pMsg); |j|rS5
protected: Gw` L"
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VEH>]-0K
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gGuO
//}}AFX_VIRTUAL 05R@7[GWq
// Implementation &,/S`ke=
protected: y`Z\N
HICON m_hIcon; Wn6Sn{8W{
// Generated message map functions 1;iUWU1@
//{{AFX_MSG(CCaptureDlg) ry]l.@o;
virtual BOOL OnInitDialog(); {8etv:y
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); HZOMlOZ
afx_msg void OnPaint(); ?]5qr?W%
afx_msg HCURSOR OnQueryDragIcon(); OrW
virtual void OnCancel(); u?EN
afx_msg void OnAbout();
:11
A
afx_msg void OnBrowse(); r_d!ikOT(
afx_msg void OnChange(); SX#&5Ka/
//}}AFX_MSG ^rz_f{c]-
DECLARE_MESSAGE_MAP() L},_.$I?
}; :'ptuY
#endif CN?gq^
{{1G`;|v9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =MWHJ'3-/
#include "stdafx.h" fV~~J2IK
#include "Capture.h" 3U}%2ARo_
#include "CaptureDlg.h" BLFdHB.$T
#include <windowsx.h> =|9!vzG4
#pragma comment(lib,"hook.lib") g{LP7D;6
#ifdef _DEBUG eH,or ,r
#define new DEBUG_NEW =lSNs
#undef THIS_FILE k{0o9,
static char THIS_FILE[] = __FILE__; <Z$J<]I
#endif ,//S`j$S
#define IDM_SHELL WM_USER+1 7:~_D7n
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q\)-BXw:
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T{'RV0%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0\$2X- c
class CAboutDlg : public CDialog 1x^GWtRp
{ D'4\*4is
public: #E]59_
CAboutDlg(); <N@Gu!N8
// Dialog Data *ui</+
//{{AFX_DATA(CAboutDlg) x^CS"v7
enum { IDD = IDD_ABOUTBOX }; Wl4%GB
//}}AFX_DATA $d4n"+7
// ClassWizard generated virtual function overrides AwN!;t_0+N
//{{AFX_VIRTUAL(CAboutDlg) ^@]3R QB
protected: `mqMLo*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \NC3'G:Ii
//}}AFX_VIRTUAL nFn5v'g
// Implementation N g,j#
protected: }7X%'Bg=M
//{{AFX_MSG(CAboutDlg) %)n=x
ne
//}}AFX_MSG Ho%CDz
z
DECLARE_MESSAGE_MAP() +[P{&\d4}
}; Zc2PepIg
0YHFvy)
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D{!IW!w
{ g&.=2uP
//{{AFX_DATA_INIT(CAboutDlg) I@3MO0V^
//}}AFX_DATA_INIT &{i{XcqH'
} NVs@S-rpX
|hQ;l|SWg
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _4f;<FL
{ aDCwI :Li(
CDialog::DoDataExchange(pDX); v>56~AJ
//{{AFX_DATA_MAP(CAboutDlg) 1eKT^bgM
//}}AFX_DATA_MAP "5
A!jq
} r
:dTz
/<3UQLMa
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1&2>LE/P
//{{AFX_MSG_MAP(CAboutDlg) fR|A(u#9
// No message handlers EQ ttoOO
//}}AFX_MSG_MAP Wjc'*QCPl
END_MESSAGE_MAP() e# bn#
g=rbPbu
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c`W,~[Q<O+
: CDialog(CCaptureDlg::IDD, pParent) y)*RV;^
{ H>C=zo,oiC
//{{AFX_DATA_INIT(CCaptureDlg) Cyp'?N
m_bControl = FALSE; olcDt&xv]
m_bAlt = FALSE; Y$zSQ_k;U
m_bShift = FALSE; Q.[0ct
m_Path = _T("c:\\"); P* o9a
m_Number = _T("0 picture captured."); ;=N#`l
nCount=0; 9B4&m|g
bRegistered=FALSE; *`U~?q}
bTray=FALSE; 0aAoV0fMDz
//}}AFX_DATA_INIT 2?x4vI
np;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H#&00 Q[
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); h$*!8=M
} Ls%MGs9PI
`2snz1>!j
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) u&NV,6Fj2[
{ y)pk6d
CDialog::DoDataExchange(pDX); n| ;Im&,
//{{AFX_DATA_MAP(CCaptureDlg) 6wxs1G
DDX_Control(pDX, IDC_KEY, m_Key); ;bG>ZqJCVA
DDX_Check(pDX, IDC_CONTROL, m_bControl); g5yJfRLxp
DDX_Check(pDX, IDC_ALT, m_bAlt); [vgtc.V
DDX_Check(pDX, IDC_SHIFT, m_bShift); wj+*E6o-n
DDX_Text(pDX, IDC_PATH, m_Path); $^P0F9~0
DDX_Text(pDX, IDC_NUMBER, m_Number); ZW}_DT0
//}}AFX_DATA_MAP 8_8l.!~
} =Uh$&m
xA/D'
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RpF&\x>
//{{AFX_MSG_MAP(CCaptureDlg) Ned."e
ON_WM_SYSCOMMAND() KSvE~h[#+
ON_WM_PAINT() ys~x$
ON_WM_QUERYDRAGICON() 6 r"<jh #
ON_BN_CLICKED(ID_ABOUT, OnAbout) HDLk>_N_s,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "fI6Cpc
ON_BN_CLICKED(ID_CHANGE, OnChange) :>*7=q=
//}}AFX_MSG_MAP _LPHPj^Pg
END_MESSAGE_MAP() xwr8`?]y
"8RSvT<W^5
BOOL CCaptureDlg::OnInitDialog() ! z**y}<T
{ P'2Qen*
CDialog::OnInitDialog(); E3i4=!Y
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6-I'>\U~
ASSERT(IDM_ABOUTBOX < 0xF000); !?XC1xe~R
CMenu* pSysMenu = GetSystemMenu(FALSE);
eIlva?
if (pSysMenu != NULL) FtZ?C@1/
{ >bxS3FCX
CString strAboutMenu; YN,A)w:]
strAboutMenu.LoadString(IDS_ABOUTBOX); M{\I8oOg
if (!strAboutMenu.IsEmpty()) q@&6#B
{ R@0R`Zs
pSysMenu->AppendMenu(MF_SEPARATOR); p[-O( 3Y
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jvi#)
} rZF*q2?
} y^k$Us
SetIcon(m_hIcon, TRUE); // Set big icon KP"+e:a%
SetIcon(m_hIcon, FALSE); // Set small icon Rv=YFo[B
m_Key.SetCurSel(0); Vj-h;rB0z
RegisterHotkey(); Th%zn2R B
CMenu* pMenu=GetSystemMenu(FALSE); <[phnU^
8
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yuVs
YV@"
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); GmG5[?)
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AdmC&!nH
return TRUE; // return TRUE unless you set the focus to a control :+Z%; Dc
} 6mE\OS-I
>Q/Dk7 #
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) VQs5"K"
{ [e
q&C_|D
if ((nID & 0xFFF0) == IDM_ABOUTBOX) GeqPRah
{ :Al!1BJQ
CAboutDlg dlgAbout; 5bIw?%dk(
dlgAbout.DoModal(); SKtr tm
} y9;Yivr)
else =vPj%oLp'a
{ lk!@?
CDialog::OnSysCommand(nID, lParam); =-T]3!
} fox6)Uot
} yX5\gO6G
FlQGgVN
void CCaptureDlg::OnPaint() @c#(.=
{ 7P
T{lT
if (IsIconic()) *I+Q~4
{ b'g )
CPaintDC dc(this); // device context for painting ,I9bNO,%JK
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); BWNi [^]
// Center icon in client rectangle >eaaaq9B-
int cxIcon = GetSystemMetrics(SM_CXICON); so;
]&
int cyIcon = GetSystemMetrics(SM_CYICON); bLL2
CRect rect; \^LFkp
GetClientRect(&rect); <$YlH@;)`a
int x = (rect.Width() - cxIcon + 1) / 2; $:6!H:ty
int y = (rect.Height() - cyIcon + 1) / 2; D=$)n_F
// Draw the icon #z(]xI)"
dc.DrawIcon(x, y, m_hIcon); 6LZCgdS{
} +mPx8P&%
else -/4P3SG/
{ Kq!3wb;
CDialog::OnPaint(); }b}m3i1
} yVfC-Z
} vX>)je5#
{I((p_
HCURSOR CCaptureDlg::OnQueryDragIcon() _GPe<H
{ <%^&2UMg
return (HCURSOR) m_hIcon; *i,%,O96Nz
} xLE)/}y_7H
,+VGSd
void CCaptureDlg::OnCancel() N mG#
{ K:M8h{Ua
if(bTray) N+|d3X!
DeleteIcon(); 0J|3kY-n>
CDialog::OnCancel(); cK@wsA^4
} "4Nt\WQ
+_!QSU,@
void CCaptureDlg::OnAbout() ~Ei<Z`3}7"
{ h;Kx!5)y
CAboutDlg dlg; qK+5NF|
dlg.DoModal(); }ZI7J
} V9vTsmo(
Iv *<La
void CCaptureDlg::OnBrowse() \['Cj*e k
{ nTas~~Q
CString str; # _1`)VS
BROWSEINFO bi; )BE1Q*=
n
char name[MAX_PATH]; '"^'MXa
ZeroMemory(&bi,sizeof(BROWSEINFO)); (:_$5&i7
bi.hwndOwner=GetSafeHwnd(); hp2t"t
bi.pszDisplayName=name; 965jtn
bi.lpszTitle="Select folder"; VVZ'i.*_3?
bi.ulFlags=BIF_RETURNONLYFSDIRS; hgmCRC
LPITEMIDLIST idl=SHBrowseForFolder(&bi); W^Yxny
if(idl==NULL) (Z*!#}z`
return; ~[ jQ!tz
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |pK!S
str.ReleaseBuffer(); I]575\bA
m_Path=str; ' QG?nu
if(str.GetAt(str.GetLength()-1)!='\\') R-:2HRaA
m_Path+="\\"; ?[AD=rUC
UpdateData(FALSE); wJ]d&::@h
} ^~dWU>
H|*m$|$,
void CCaptureDlg::SaveBmp() [
3Gf2_
{ \m,PA'nd/
CDC dc; s%S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y*^[P,+J*}
CBitmap bm; 0@(&eH=
int Width=GetSystemMetrics(SM_CXSCREEN); EPm/r
int Height=GetSystemMetrics(SM_CYSCREEN); ;jXgAAz7
bm.CreateCompatibleBitmap(&dc,Width,Height); *hx
CDC tdc; yfSmDPh
tdc.CreateCompatibleDC(&dc); d$RIS+V
CBitmap*pOld=tdc.SelectObject(&bm); `A >@]d
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +TJCLZ..
tdc.SelectObject(pOld); M{@(G5
BITMAP btm; =(Mch~
bm.GetBitmap(&btm); -~0^P,yQ
DWORD size=btm.bmWidthBytes*btm.bmHeight; hrn+UL:d
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P?\6@_ Z
BITMAPINFOHEADER bih; @- xjfC\d
bih.biBitCount=btm.bmBitsPixel; ^y::jK
bih.biClrImportant=0; G2D$aSh
bih.biClrUsed=0; ,hVli/
bih.biCompression=0; x4 yR8n(
bih.biHeight=btm.bmHeight; pb}*\/s
bih.biPlanes=1; \bcLiKE{
bih.biSize=sizeof(BITMAPINFOHEADER); KwS@D9bok
bih.biSizeImage=size; tc! #wd+u
bih.biWidth=btm.bmWidth; uYN`:b8
bih.biXPelsPerMeter=0; WLT"ji0w2
bih.biYPelsPerMeter=0; TxD#9]Q`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *p U x8yB
static int filecount=0; NOva'qk
CString name; %Zi} MPx
name.Format("pict%04d.bmp",filecount++); $I=~S[p
name=m_Path+name; N['.BN
BITMAPFILEHEADER bfh; tA;}h7/Lc~
bfh.bfReserved1=bfh.bfReserved2=0; 8=l%5r^cq
bfh.bfType=((WORD)('M'<< 8)|'B'); kj_c%T
]/
bfh.bfSize=54+size; ,prf;|e?
bfh.bfOffBits=54; XTyxr
CFile bf; t# i#(H
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k:;r2f
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \dVOwr
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v+XJ*N[W
bf.WriteHuge(lpData,size); (HVGlw'`
bf.Close(); X8|,
nCount++; DVA:Cmh\
} ;+%rw 2Z,B
GlobalFreePtr(lpData); r&CiSMS*
if(nCount==1) p+eh%2Jm
m_Number.Format("%d picture captured.",nCount); n S=W 1zf
else HfVZ~PP
m_Number.Format("%d pictures captured.",nCount); +%'(!A?*`
UpdateData(FALSE); Da|z"I
x
} )8AXm
@]j1:PN-
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) A"]YM'.
{ rp$'L7lrX
if(pMsg -> message == WM_KEYDOWN) ;pAK_>
{ >7|VR:U?B
if(pMsg -> wParam == VK_ESCAPE) Ac@VGT:9
return TRUE; s[jTP(d)8
if(pMsg -> wParam == VK_RETURN) uT"rq:N
return TRUE; G\i9:7 `
} 9w"*y#_
return CDialog::PreTranslateMessage(pMsg); OXA7w.^
} *wearCPeJ
dN q$}
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h{Y",7]!
{ *@5 @,=d
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qGo.WZ$
SaveBmp(); ]Ze1s02(
return FALSE; :;}P*T*PU
} %J(:ADu]
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W\3X=@|u)
CMenu pop; Y<OFsWYY
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); nlP;nl W
CMenu*pMenu=pop.GetSubMenu(0); ~ljXzD93Z
pMenu->SetDefaultItem(ID_EXITICON); 0J9x9j`&j
CPoint pt; lA]8&+,ZM
GetCursorPos(&pt); ?,mmYW6TjB
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kP:!/g
if(id==ID_EXITICON) iS^QTuk3%
DeleteIcon(); uRvP hkqm
else if(id==ID_EXIT) ';CNGv -
OnCancel(); [y(MCf19
return FALSE; @gblW*Zhk
} L!9 2P{ K
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %b$>qW\*&
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )A6<c%d =x
AddIcon(); q V=!ORuj
return res; 4?kcv59
} (.:e,l{U%
ah "o~Cbj
void CCaptureDlg::AddIcon() /uc>@!F
{ N~Jda
o
NOTIFYICONDATA data; <'u'#E@"sl
data.cbSize=sizeof(NOTIFYICONDATA); X'ag)|5ot
CString tip; #qki
tip.LoadString(IDS_ICONTIP); * 4'"2"
data.hIcon=GetIcon(0); @ArSC
data.hWnd=GetSafeHwnd(); Jy)/%p~
strcpy(data.szTip,tip); O.? JmE
data.uCallbackMessage=IDM_SHELL; Gc?a +T
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _BufO7`.
data.uID=98; K(4_a``05
Shell_NotifyIcon(NIM_ADD,&data); MgZ/(X E
ShowWindow(SW_HIDE); 4#D,?eA7
bTray=TRUE; dtDFoETz
} /ZX}Nc g
&>O+}>lr9
void CCaptureDlg::DeleteIcon() \bXa&Lq
{ =;L|gtH"
NOTIFYICONDATA data; 4W75T2q#
data.cbSize=sizeof(NOTIFYICONDATA); 2?C)&
data.hWnd=GetSafeHwnd(); j 7B!h|
data.uID=98; )%TmAaj9d
Shell_NotifyIcon(NIM_DELETE,&data); 8*X4\3:*N
ShowWindow(SW_SHOW); &=[WIG+rk
SetForegroundWindow(); Qs!5<)6
ShowWindow(SW_SHOWNORMAL); w0.
u\
bTray=FALSE; + {]j]OP
} WJi]t9 3
"+c-pO`Wg
void CCaptureDlg::OnChange() 4g/dP^
{ mpyt5#f
RegisterHotkey(); Wwo0%<2y
} 6BlXLQ,8q
JF]JOI6.e
BOOL CCaptureDlg::RegisterHotkey() sOY:e/_F
{ +@UV?"d
UpdateData(); t20K!}D_
UCHAR mask=0; TeQV?ZQ#}
UCHAR key=0; xdPx{"C
3
if(m_bControl) DU^loB+
mask|=4; P?<y%c<
if(m_bAlt) , gHDx
mask|=2; _1^'(5f$
if(m_bShift) crCJrN=
mask|=1; \8tsDG(1 '
key=Key_Table[m_Key.GetCurSel()]; #yen8SskB
if(bRegistered){ 4-w{BZuS
DeleteHotkey(GetSafeHwnd(),cKey,cMask); UiWg<_<t
bRegistered=FALSE; =4!mAo}
} $G>. \t
cMask=mask; ooGM$U
cKey=key; Gj*9~*xm(
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %O<BfIZ
return bRegistered; x-c"%Z|
} bt *k.=p
-j(6;9"7]|
四、小结 Bvj0^fSm
KoY F]
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。