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:
)yv~wi
coc:$Sr% 一、实现方法
%967#XI[y 1s#GY<< 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
C<iOa)_@Q SCD;(I~4 #pragma data_seg("shareddata")
%J|xPp) HHOOK hHook =NULL; //钩子句柄
ZY> u4v. UINT nHookCount =0; //挂接的程序数目
[$%0[;jtS static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
2dBjc{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
)N]%cO(^ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
0Ewt
>~n static int KeyCount =0;
[r=U- static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
|#(g8ua7 #pragma data_seg()
L~L]MC& y O?52YO 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。
Zq"wq[GCN bR|1*< 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:
<fcw:Ae xT3l>9i BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
kX]p;C cKey,UCHAR cMask)
8]0?mV8iOE {
,DWC=:@X BOOL bAdded=FALSE;
|:d:uj/ for(int index=0;index<MAX_KEY;index++){
mi{ r7.e5I if(hCallWnd[index]==0){
jh.e&6 hCallWnd[index]=hWnd;
1"HSM=p HotKey[index]=cKey;
v`u>;S_ HotKeyMask[index]=cMask;
7)v`l1 bAdded=TRUE;
Zl`sY5{1 KeyCount++;
N`i`[ f break;
d`4@aoM }
&5;y&dh }
ffE>%M* return bAdded;
gT4H?
#UB }
O(f&0h
! //删除热键
cdsF<tpy BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
g4>1> .s {
U})Z4>[bvt BOOL bRemoved=FALSE;
[=I==?2`X for(int index=0;index<MAX_KEY;index++){
I~I$/j]e` if(hCallWnd[index]==hWnd){
]%/a'[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<\5Y~!) hCallWnd[index]=NULL;
\%:]o-+"I HotKey[index]=0;
>iB-gj}>X HotKeyMask[index]=0;
+S>}<OE bRemoved=TRUE;
yzmwNsu KeyCount--;
0_5j( break;
7u7 <"?v= }
>c:- ;( k }
H(Q|qckj }
*;C8g{ return bRemoved;
zE<G wVI~ }
2wG4" s|=.L&" B[Fuy y? DLL中的钩子函数如下:
eFeWjB'<7 O1K~]Nt LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#>byP?)n {
{^n\
r^5 BOOL bProcessed=FALSE;
.Qeml4(`3 if(HC_ACTION==nCode)
)|zna{g\ {
#5.L%F if((lParam&0xc0000000)==0xc0000000){// 有键松开
Z<0+<tt switch(wParam)
M.R]hI {
N%&D(_ case VK_MENU:
b/Z0{38 MaskBits&=~ALTBIT;
#ZRplA~C7] break;
?*8HZ1m# case VK_CONTROL:
ZM%z"hO9R MaskBits&=~CTRLBIT;
,0Y5O?pu\ break;
RDu'N case VK_SHIFT:
m}3POl/*j MaskBits&=~SHIFTBIT;
f@a@R$y break;
R9z^=QKcH default: //judge the key and send message
\3@A C7 break;
|+MV%QG; }
5=.EngG for(int index=0;index<MAX_KEY;index++){
q#~]Hp=W5 if(hCallWnd[index]==NULL)
|.Pl[y continue;
'qg q8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b(~
gQM {
Soa5TM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9v<Sng bProcessed=TRUE;
| <ZkJR3B }
:i6k6= }
;|LS$O1c }
?geEq' else if((lParam&0xc000ffff)==1){ //有键按下
,\K1cW~U5 switch(wParam)
mJ|7Jc {
8\^[@9g3\3 case VK_MENU:
=Gq
'sy:h MaskBits|=ALTBIT;
L){rv)?=" break;
_8'F I_E3 case VK_CONTROL:
k&1~yW MaskBits|=CTRLBIT;
'.wyfS H@ break;
AT{ewb case VK_SHIFT:
g{cHh(S MaskBits|=SHIFTBIT;
"kjjq~l break;
\k|ZbCWg default: //judge the key and send message
&n:F])`2 break;
SdfrLdi}Y }
o2ndnIL for(int index=0;index<MAX_KEY;index++){
-'|pt,) if(hCallWnd[index]==NULL)
!Fz9\| continue;
tU%-tlU9? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^m
{
EO;f`s)t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
D n?P~% bProcessed=TRUE;
$W8 }
"]nbM}> }
~qiSkG }
snBC +`- if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
<'4DMZ-G for(int index=0;index<MAX_KEY;index++){
M,Px.@tw. if(hCallWnd[index]==NULL)
*s6MF{Ds continue;
|^ml|cb if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
zSYWNmj& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
iD|"} }01 //lParam的意义可看MSDN中WM_KEYDOWN部分
"l&sDh%Lk< }
&0
VM <
}
<bf^'$l }
ud`.}H~aB return CallNextHookEx( hHook, nCode, wParam, lParam );
.O'gD.|^N }
J|Lk::Ri NDRk%_Eu( 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:
O329Bkg 4.3Bz1p BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
&Sc}3UI/F BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
c(bh i y= ILA 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:
@Ns^?#u~ m4nJ9<- LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
xnu|?;.}! {
+MQf2|-- if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
A;h0BQm/j {
XQk9 U //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
0X)'8N SaveBmp();
sf?D4UdIH return FALSE;
;1cX|N= }
`ge{KB;*n# …… //其它处理及默认处理
r! 5C3 }
/ vge@bsE 79a{Zwdd9j odquAqn 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。
0}Xkj)R, 1H@GwQ|<= 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。
5jg^12EP @)m+O#a 二、编程步骤
U$pHfNTH awXL}m[_! 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
{P(Z{9 u% -?!Z/#i4 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
/+J?Ep(_ F#iLMO&Q 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
ha'oLm# @yB!? x 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
gB<p tGD$cBE 5、 添加代码,编译运行程序。
;'pEzz?k" g?i_10Xlp 三、程序代码
.d9VV& {:Z# 8dGe ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
S]1+tj #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
[8SW0wsk #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
cCU'~ #if _MSC_VER > 1000
OR( )D~:n #pragma once
}<&g1x'pa #endif // _MSC_VER > 1000
Qkk~{OuC #ifndef __AFXWIN_H__
:H\6wJ #error include 'stdafx.h' before including this file for PCH
z0HCmj9T #endif
&.o}(e:] #include "resource.h" // main symbols
~@bCSOIy class CHookApp : public CWinApp
?i(Tc! {
pp#Kb 2* public:
w]) bQ7) CHookApp();
gA!-F}x$ // Overrides
&6MGPh7T // ClassWizard generated virtual function overrides
Ajq;\-: //{{AFX_VIRTUAL(CHookApp)
t22BO@gt74 public:
n`6 8<ybl5 virtual BOOL InitInstance();
kd'qYh virtual int ExitInstance();
.^djB
x //}}AFX_VIRTUAL
j>?H^fB //{{AFX_MSG(CHookApp)
_QBd3B% // NOTE - the ClassWizard will add and remove member functions here.
8+
B. x // DO NOT EDIT what you see in these blocks of generated code !
bg_Zf7{ //}}AFX_MSG
UY{
Uo@k9x DECLARE_MESSAGE_MAP()
uiE9#G };
1w+&Y;d| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
5]p>&|Ud BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
L|6c lGp BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JeUFCWm BOOL InitHotkey();
aiw~4ix BOOL UnInit();
F^T7u?^) #endif
J`} /+WN 7 68)z`JI|<) //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
KzeA+PI #include "stdafx.h"
(LRv c!`" #include "hook.h"
jfqWcX.X= #include <windowsx.h>
XT~JP #ifdef _DEBUG
;b
cy(Fp,\ #define new DEBUG_NEW
C+r--"Z #undef THIS_FILE
F.PD5%/$q static char THIS_FILE[] = __FILE__;
.XURI#b #endif
<pYGcVB9V #define MAX_KEY 100
U`:#+8h-} #define CTRLBIT 0x04
zi[bpa17W #define ALTBIT 0x02
>eAlz4 #define SHIFTBIT 0x01
LD_aJ^(d #pragma data_seg("shareddata")
V)Z*X88:Tv HHOOK hHook =NULL;
;-^WUf| UINT nHookCount =0;
Qh/yPOSm: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
in#qV static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
na
$z\C\ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
vT%rg r static int KeyCount =0;
)@1_Dm@0b static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
y
@Y@"y #pragma data_seg()
0gO2^m)W HINSTANCE hins;
kZ`60X%wE void VerifyWindow();
AZl|;
y BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}#EiL
!Pv //{{AFX_MSG_MAP(CHookApp)
c4L5"_#`x- // NOTE - the ClassWizard will add and remove mapping macros here.
X"iy.@7 // DO NOT EDIT what you see in these blocks of generated code!
X-oou'4< //}}AFX_MSG_MAP
3{d1Jk/S END_MESSAGE_MAP()
wzo-V^+q fRaVY`|wK CHookApp::CHookApp()
b%,5B {
A{9Hm:) // TODO: add construction code here,
|%&WYm6 // Place all significant initialization in InitInstance
B`RbXk68q }
1/gY]ghL WF *2^iWJ CHookApp theApp;
OYG8%L LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7gD$Q {
z>~`9Qiw' BOOL bProcessed=FALSE;
@U5+1Hjc if(HC_ACTION==nCode)
(M.Sl {
O+.V,`O if((lParam&0xc0000000)==0xc0000000){// Key up
4d0PW#97. switch(wParam)
wGnjuIR {
Sr2c'T" case VK_MENU:
rm3~] MaskBits&=~ALTBIT;
JsfbY^wz break;
u4z]6?,"e case VK_CONTROL:
K{M_ 4'\ MaskBits&=~CTRLBIT;
:Nc~rOC_ break;
&giJO-^
f case VK_SHIFT:
YDjQ&EH MaskBits&=~SHIFTBIT;
SGNi~o break;
&z1r$X.AW default: //judge the key and send message
_i}6zxqw break;
bhe|q`1,E }
v8 6ls[lzu for(int index=0;index<MAX_KEY;index++){
nV:.-JR if(hCallWnd[index]==NULL)
z<^HohT continue;
eg?vYW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C/!2q$ {
;EFs2-{K SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
_6=6 b!hD bProcessed=TRUE;
]7dm`XV
}
0qJ(3N }
2{+\\.4Evk }
l<7 b else if((lParam&0xc000ffff)==1){ //Key down
tTWYlbDFN switch(wParam)
&~$^a1D6 {
?F?!QrL case VK_MENU:
"=yaeEp MaskBits|=ALTBIT;
v,+2CVdW break;
,p$1n; case VK_CONTROL:
>K50 h MaskBits|=CTRLBIT;
!^l<jrM break;
>-y'N.l^ case VK_SHIFT:
)
I-8. MaskBits|=SHIFTBIT;
Gt6$@ji4u break;
V-7!)&q default: //judge the key and send message
oB_{xu$6| break;
Q6.},o }
U]e;=T:3 for(int index=0;index<MAX_KEY;index++)
l6l)M {
*<Qn)Az if(hCallWnd[index]==NULL)
(U$ F) 7 continue;
uERc\TZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]dk~C?H {
lW^RwNcd SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S1&6P)X.Za bProcessed=TRUE;
dLQ!hKD~ }
$stJ+uh }
J
tYnBg?[E }
#@y4/JS&2 if(!bProcessed){
^P&y9dC. for(int index=0;index<MAX_KEY;index++){
p(U'c}@2 if(hCallWnd[index]==NULL)
'Ur$jW continue;
)W*S6}A if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
8#7z5:_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
!\?? [1_e }
G'{4ec0<{ }
q ,}W. }
/A<L return CallNextHookEx( hHook, nCode, wParam, lParam );
2,NQ(c_c$ }
6PvV X*5T c(YNv4*X BOOL InitHotkey()
\!G&:<h {
@Cw<wrem if(hHook!=NULL){
,pf<"^li nHookCount++;
&:'Uh
W-t return TRUE;
\J9@p }
oEKLuy else
sbkWJy hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
&*MwKr<y if(hHook!=NULL)
M@8
<^CK nHookCount++;
ZIpL4y
=_ return (hHook!=NULL);
H$1R\rE` }
lm]4zs /A BOOL UnInit()
MK~viSgi {
/p X\)wi if(nHookCount>1){
e:!&y\'"9 nHookCount--;
Cd6^aFoK! return TRUE;
#Q$9Eq8"[ }
UKk~)Of BOOL unhooked = UnhookWindowsHookEx(hHook);
|*OS;FD5 if(unhooked==TRUE){
[",W TZ: nHookCount=0;
=wI,H@ hHook=NULL;
~{U~9v^v( }
JsVW:8QO~ return unhooked;
PN0:,.4 }
ic?6p lh8`.sWk4V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
mm:\a-8j {
Os?~U/ BOOL bAdded=FALSE;
8BLtTpu for(int index=0;index<MAX_KEY;index++){
x*bM C&Ea if(hCallWnd[index]==0){
>RF[0s'- hCallWnd[index]=hWnd;
A*MlK" HotKey[index]=cKey;
H.wp{m{ HotKeyMask[index]=cMask;
dO rgqz`e bAdded=TRUE;
[^~Fu9+" KeyCount++;
Ou8@7S break;
0I~xD9l9 }
x:@Ht TX }
F/&Z1G. return bAdded;
",`fGu ) }
y\r8_rBo jIAl7aoY BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ZqS'xN:k {
']A+wGR&r BOOL bRemoved=FALSE;
}& `# for(int index=0;index<MAX_KEY;index++){
{$O.@#' if(hCallWnd[index]==hWnd){
3EF|1B/5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
/`}C~ hCallWnd[index]=NULL;
'$q'Wl) HotKey[index]=0;
QfT&y & HotKeyMask[index]=0;
YG"P:d;s bRemoved=TRUE;
&xrm;pO KeyCount--;
'UW7zL5 break;
waO*CjxE: }
$>8+t>| }
dl(cYP8L }
O<."C=1~E return bRemoved;
QZt/Rm>W0 }
2/qfK+a ]}~*uT}> void VerifyWindow()
b!<?,S {
aL+k1v[m for(int i=0;i<MAX_KEY;i++){
cz&Qoyh{; if(hCallWnd
!=NULL){ mi%d([)%<
if(!IsWindow(hCallWnd)){ !-LPFy>
hCallWnd=NULL; ]%ikr&78u
HotKey=0; 4+' yJ9~,B
HotKeyMask=0; {u3^#kF
KeyCount--; :}e*3={4
} T~=NY,n
} 2vu"PeU9
} .2[>SI
} !)_80O1
6&$z!60
BOOL CHookApp::InitInstance() ^\{%(i9
{ /|`;|0/2
AFX_MANAGE_STATE(AfxGetStaticModuleState()); c i_XcG
hins=AfxGetInstanceHandle(); zZ
OoPE
InitHotkey(); V5qvH"^
return CWinApp::InitInstance(); 2EycFjO
} pkjL2U:
$2 ~A^#"0
int CHookApp::ExitInstance() 1LT)%_d@
{ tiI>iP`!
VerifyWindow(); DJ[U^dWRn
UnInit(); }bAd@a9>3
return CWinApp::ExitInstance(); vC&y:XMt,`
} nPR_:_^
<P(d%XEl
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kIP~XV~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b ]1SuL
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _I3j7f,V
#if _MSC_VER > 1000 9\R:J"X
#pragma once 2AzF@Pi^z
#endif // _MSC_VER > 1000 .LN&EfMenF
+, p
class CCaptureDlg : public CDialog #O\4XZ,Lv
{ DIkD6n?V
// Construction 'O
\YL(j_e
public: v9u/<w68!
BOOL bTray; ~EpMO]I
BOOL bRegistered; vn6/H8
BOOL RegisterHotkey(); 5i83(>p3]e
UCHAR cKey; 2W$c%~j$2
UCHAR cMask; -gv@
.# N
void DeleteIcon(); !94&Uk(O
void AddIcon(); D8paIp
UINT nCount; +mMn1&
void SaveBmp(); e7>)Z
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ()}O|JL:K
// Dialog Data ;)u}`4~L
//{{AFX_DATA(CCaptureDlg) UVxE~801Y
enum { IDD = IDD_CAPTURE_DIALOG }; Ajs<a(,6
CComboBox m_Key; -TjYQ
BOOL m_bControl; eLL>ThMyW
BOOL m_bAlt;
yL_-w/a
BOOL m_bShift; $ 6Nm`[V
CString m_Path; Bl3G_Ep
CString m_Number; =_D82`p
//}}AFX_DATA !|}J{
// ClassWizard generated virtual function overrides A5F< <
//{{AFX_VIRTUAL(CCaptureDlg) lWd)(9Kj
public: =}Bq"m
virtual BOOL PreTranslateMessage(MSG* pMsg); 7.hVbjy'-
protected: B#B$w_z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &s\$&%|
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #fzvK+
//}}AFX_VIRTUAL rRYP~
$c
// Implementation (GMKIw2
protected: ~AS2$
HICON m_hIcon; n<"?+bz"<
// Generated message map functions J=Ak+J
//{{AFX_MSG(CCaptureDlg) Yw\}'7
virtual BOOL OnInitDialog(); ?G*XZ0u~
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); I&q:w\\z8|
afx_msg void OnPaint(); *~lD;{2
afx_msg HCURSOR OnQueryDragIcon(); wU2y<?$\8
virtual void OnCancel(); ]Qkto4DQ5
afx_msg void OnAbout(); !5?#^q
afx_msg void OnBrowse(); nyw, Fu
afx_msg void OnChange(); Zo-E0[9
//}}AFX_MSG ^.nvX{H8~=
DECLARE_MESSAGE_MAP() 7$8z}2
}; ?*9U
d
#endif aVz<RS
w4:n(.;HK
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [I4K`>|Z
#include "stdafx.h" o!aKeM~|Es
#include "Capture.h" ~SUA.YuF
#include "CaptureDlg.h" GWM2l?zOP
#include <windowsx.h> 'R*xg2!i
#pragma comment(lib,"hook.lib") nAoGG0$5
#ifdef _DEBUG \&&kUpI
#define new DEBUG_NEW 23_<u]V
#undef THIS_FILE c^6v7wT5
static char THIS_FILE[] = __FILE__; a_`E'BkgU
#endif H{\tQ->(2
#define IDM_SHELL WM_USER+1 *O)_D
bj
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8v*>~E/0
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >#$(M5&}-
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t TA6 p
class CAboutDlg : public CDialog MPAZ%<gmD
{ ?\<2*sW [k
public: GH7{_@pv8
CAboutDlg(); P9B@2#
// Dialog Data 0u,=OvU
//{{AFX_DATA(CAboutDlg) PJAE~|a
enum { IDD = IDD_ABOUTBOX }; j<szQ%tJlI
//}}AFX_DATA _>dqz(8#
// ClassWizard generated virtual function overrides >tr_Ypfv,c
//{{AFX_VIRTUAL(CAboutDlg) x/[i &Gkv
protected: k{s#wJA
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Av.(i2
//}}AFX_VIRTUAL o!q9pt
// Implementation /JEH%)
protected: >m:.5][yu
//{{AFX_MSG(CAboutDlg) ^n@iCr9
//}}AFX_MSG YQ,IdWav
DECLARE_MESSAGE_MAP() p0qQ(
}; L}XEROTR
"<v_fF<Y
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $a15
8
{ 6x]|IWvW
//{{AFX_DATA_INIT(CAboutDlg) KjZ^\lq'
//}}AFX_DATA_INIT ~9kvC&/{[
} Uf4QQ`c#
?OZbns~
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S4qh8c
{ O .TFV.
CDialog::DoDataExchange(pDX); ]N!SG@X+
//{{AFX_DATA_MAP(CAboutDlg) c5;YKON
//}}AFX_DATA_MAP cuq7eMG6z
} Y@9L8XNP>
Tb IM{X
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) nd3]&occ
//{{AFX_MSG_MAP(CAboutDlg) x^+ C[%
// No message handlers L]K*Do
//}}AFX_MSG_MAP iJ?8)}
END_MESSAGE_MAP() Q,#M
0
'x+0
yd
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2}$Vi$
R
: CDialog(CCaptureDlg::IDD, pParent) iV'-j,-i
{ v0"|J3
//{{AFX_DATA_INIT(CCaptureDlg) I;P?P5H
m_bControl = FALSE; z9w@-])
m_bAlt = FALSE; yC+N18y?
m_bShift = FALSE; K ANE"M
m_Path = _T("c:\\"); .Z%7+[
m_Number = _T("0 picture captured."); px//q4U
nCount=0; n
'P:
bRegistered=FALSE; &0(2Z^Z>fw
bTray=FALSE; 7 aDI6G
//}}AFX_DATA_INIT _\@i&3hkx
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d2.n^Q"?3
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "{z9 L+
} `3pe\s
j@GMZz<
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m9#u.Q*
{ U|{WtuR
CDialog::DoDataExchange(pDX); v bDw2
//{{AFX_DATA_MAP(CCaptureDlg) o<Y|N
DDX_Control(pDX, IDC_KEY, m_Key); +bdkqdB9
DDX_Check(pDX, IDC_CONTROL, m_bControl); )Bb :tz+
DDX_Check(pDX, IDC_ALT, m_bAlt); &sS k~:
DDX_Check(pDX, IDC_SHIFT, m_bShift); _j%Rm:m;<
DDX_Text(pDX, IDC_PATH, m_Path); ,J}lyvkd
DDX_Text(pDX, IDC_NUMBER, m_Number); M8KfC!
//}}AFX_DATA_MAP /
s H*if
} jvu,W4
~{^AP
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ei\X/Z*q%P
//{{AFX_MSG_MAP(CCaptureDlg) Ql&P1|&
ON_WM_SYSCOMMAND() OQ+?nB
ON_WM_PAINT() 2i,Jnv=sR
ON_WM_QUERYDRAGICON() 'kH#QO\(e"
ON_BN_CLICKED(ID_ABOUT, OnAbout) {H])Fob
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) PDD` eK}Fj
ON_BN_CLICKED(ID_CHANGE, OnChange) *k+QX
//}}AFX_MSG_MAP A:
0]
n
END_MESSAGE_MAP() ]"/ *7NM
N..9N$+(
BOOL CCaptureDlg::OnInitDialog() ~Rv U+D
{ e% 5!
CDialog::OnInitDialog(); (a^F`#]
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6bHj<6>MX
ASSERT(IDM_ABOUTBOX < 0xF000); .*Hv^_
CMenu* pSysMenu = GetSystemMenu(FALSE); A]H+rxg
if (pSysMenu != NULL) ^<y$+HcH
{ V{d"cs>9
CString strAboutMenu; dcHkb,HsO
strAboutMenu.LoadString(IDS_ABOUTBOX); q8kt_&Ij
if (!strAboutMenu.IsEmpty()) (/@o7&>*50
{ )s6tjlf8
pSysMenu->AppendMenu(MF_SEPARATOR); ;P2~cQjD;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jt)<RMQ^R
} =602%ef\
} KJ9~"v
SetIcon(m_hIcon, TRUE); // Set big icon TS
UN(_XGW
SetIcon(m_hIcon, FALSE); // Set small icon >@oO7<WB
m_Key.SetCurSel(0); S?Eg
RegisterHotkey(); 8De
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CMenu* pMenu=GetSystemMenu(FALSE); o,aI<5"
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e;!<3b
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )$th${pd#v
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Uj!L:u2b
return TRUE; // return TRUE unless you set the focus to a control 4
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} @&EP&
$*
$7BD~U
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \[>Rt
{ A@DIq/^xM
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Qz$.t>@V=
{ UI8M<
CAboutDlg dlgAbout; uk\GAm@O
dlgAbout.DoModal(); b%)a5H(
} C
y&L,
else ,9A[o`b
{ PMrvUM62
CDialog::OnSysCommand(nID, lParam); Nm;ka&'
} Q2fa]*Z5
} MaMs(
C}00S{nAZ
void CCaptureDlg::OnPaint() 7XwFO0==
{ aX~iY ~?_
if (IsIconic()) ]\_4r)cN<n
{ .0a$E`V=D
CPaintDC dc(this); // device context for painting D2?7=5DgS
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WrG)&&d
// Center icon in client rectangle p1|@F^Q
int cxIcon = GetSystemMetrics(SM_CXICON); pkxW19h*0
int cyIcon = GetSystemMetrics(SM_CYICON); #D>8\#53V/
CRect rect; |J6CH87>
GetClientRect(&rect); T
7
hC]R
int x = (rect.Width() - cxIcon + 1) / 2; F`38sq
int y = (rect.Height() - cyIcon + 1) / 2; }NYsKu_cM
// Draw the icon M~"K@g=Wr
dc.DrawIcon(x, y, m_hIcon); `q5*VqIhs
} HX=`kkX
else _C*}14
"3
{ z!F?#L5
CDialog::OnPaint(); t;4{l`dk
} `[:f;2(@
}
Ng-3|N
Pd@?(WQ
HCURSOR CCaptureDlg::OnQueryDragIcon() ^$T>3@rDB
{ 1= <Qnmw
return (HCURSOR) m_hIcon; Y)a 7osML
} @|cas|U.r
r-!8in2
void CCaptureDlg::OnCancel() e8gD(T
{ f|<
*2Mk
if(bTray) t=yM}#r$
DeleteIcon(); qQ|v~^
CDialog::OnCancel(); ey Cg *
} F5*Xx g}N
Rq\.RR](
void CCaptureDlg::OnAbout() )fC^h=Qp
{ 4{J%`H`Q!
CAboutDlg dlg; SYC_=X
dlg.DoModal(); +1cK (Si
} $)\ocsO
-Ol/r=/&
void CCaptureDlg::OnBrowse() TSD7.t)^
{ $MP'j9-S?
CString str; 3N<FG.6
BROWSEINFO bi; xl<Cstr
char name[MAX_PATH]; "4ovMan
ZeroMemory(&bi,sizeof(BROWSEINFO)); N2x\O~7
bi.hwndOwner=GetSafeHwnd(); -ff*,b$Q/
bi.pszDisplayName=name; /O&j1g@
bi.lpszTitle="Select folder"; gN(8T_r
bi.ulFlags=BIF_RETURNONLYFSDIRS; K\;b3
LPITEMIDLIST idl=SHBrowseForFolder(&bi); IJs`3?
if(idl==NULL) 0_%u(?
return;
ft$/-;
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^(a %B
str.ReleaseBuffer(); //AS44^IS
m_Path=str; #5'9T:8
if(str.GetAt(str.GetLength()-1)!='\\') sYp@.?Tz
m_Path+="\\"; ya|7hz {
UpdateData(FALSE); e&wWlB![
} v_oNM5w
z?+N3p9
void CCaptureDlg::SaveBmp() A!hkofQ
{ DMf:u`<
CDC dc; :GO}G`jY
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^OYar(
CBitmap bm; \f%jN1z
int Width=GetSystemMetrics(SM_CXSCREEN); ~I!7]i]"*?
int Height=GetSystemMetrics(SM_CYSCREEN); IF@)L>-%
bm.CreateCompatibleBitmap(&dc,Width,Height); Rb\\6BU0
CDC tdc; (u RAK
tdc.CreateCompatibleDC(&dc); {HQ?
CBitmap*pOld=tdc.SelectObject(&bm); ]X{LZYk
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); S^~GI$
tdc.SelectObject(pOld); uZg Kex;c
BITMAP btm; NbfV6$jo
bm.GetBitmap(&btm); uE+]]ir
DWORD size=btm.bmWidthBytes*btm.bmHeight; up`!r;5-
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !7Ta Vx}`(
BITMAPINFOHEADER bih; Lymy/9
bih.biBitCount=btm.bmBitsPixel; Uln[UK
bih.biClrImportant=0; *qGxQ?/
bih.biClrUsed=0; M2mte#h
bih.biCompression=0; bf::bV?T
bih.biHeight=btm.bmHeight; aQw?r
bih.biPlanes=1; g)2}`}
bih.biSize=sizeof(BITMAPINFOHEADER); =3l%ZL/
bih.biSizeImage=size; "M1[@xog
bih.biWidth=btm.bmWidth; @/XA*9]l
bih.biXPelsPerMeter=0; 91e&-acA
bih.biYPelsPerMeter=0; l *.#g
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gHA"O@HgDI
static int filecount=0;
"ifYy>d
CString name; leX&py
name.Format("pict%04d.bmp",filecount++); *N<~"D
name=m_Path+name; hbzU?_}
BITMAPFILEHEADER bfh; a\aJw[d{
bfh.bfReserved1=bfh.bfReserved2=0; #(T
bfh.bfType=((WORD)('M'<< 8)|'B'); ti3T?_
bfh.bfSize=54+size; EO3?Dev
bfh.bfOffBits=54; 7k{C'\m
CFile bf; fD]}&xc
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ WFULQQ*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); j8L!miv6
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); eDgRYa9\
bf.WriteHuge(lpData,size); ?nCG:\&;'=
bf.Close(); mKQ!@$*
nCount++; >
QDmSy*&
} 6Jrh'6o@
GlobalFreePtr(lpData); gI<TfcC
if(nCount==1) Y6&w0~?!
m_Number.Format("%d picture captured.",nCount); oaM $<
else -6(C^X%
m_Number.Format("%d pictures captured.",nCount); W{Ine>
a'
UpdateData(FALSE); DHd9yP9-
} C/\)-^
iE!\)7y
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }RDGk+x7|
{ ^ [uA^
if(pMsg -> message == WM_KEYDOWN) bBn4m:
{ u-$(TyDEl|
if(pMsg -> wParam == VK_ESCAPE) vzd1:'^t
return TRUE; $&I##od
if(pMsg -> wParam == VK_RETURN) S{zi8Oc6
return TRUE; :4;ZO~eq!
} F/IXqj
return CDialog::PreTranslateMessage(pMsg); B{PI&a9~s%
} M6[&od
&2d^=fih
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K}L-$B*i
{ bb`GV
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {.K>9#^m
SaveBmp(); 'C)`j{CS
return FALSE; W
MU9tq[
} )xy1DA
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (:4N#p
CMenu pop; uK2MC?LP
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b*\K I
CMenu*pMenu=pop.GetSubMenu(0); ! av
B &Z
pMenu->SetDefaultItem(ID_EXITICON); ?k
CK$P
CPoint pt; D .oX>L#:
GetCursorPos(&pt); ^y]CHr
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c,:xm=&
if(id==ID_EXITICON) QX1QYwcm G
DeleteIcon(); ~k'KS
7c
else if(id==ID_EXIT) ]v{f!r=}
OnCancel(); ;!v2kVuS]
return FALSE; R'`q0MoN1
} UR>zL3
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $e)d!m.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J=JYf_=4bc
AddIcon(); ~Pq1@N>n
return res; FctqE/>}I
} J\^ZRu_K
<C`qJP-
void CCaptureDlg::AddIcon() CkKr@. dV
{ $vlq]6V8
NOTIFYICONDATA data; sKVN*8ia
data.cbSize=sizeof(NOTIFYICONDATA); $!)Sgb
CString tip; xDD3Y{K
tip.LoadString(IDS_ICONTIP); t;!vjac
data.hIcon=GetIcon(0); hy3j8?66
data.hWnd=GetSafeHwnd(); ;}"_hLX
strcpy(data.szTip,tip); ^V#9{)B
data.uCallbackMessage=IDM_SHELL; FAkjFgUJp
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ue^2H[zs-
data.uID=98; ~za=yZo7(
Shell_NotifyIcon(NIM_ADD,&data); ?mU
3foa
ShowWindow(SW_HIDE); OOA%NKV
bTray=TRUE; 7p}J]!Z
} CZe0kH^:{
RY3ANEu+
void CCaptureDlg::DeleteIcon() /Ut h#s:
{ Ab ,n^
NOTIFYICONDATA data; :vZ8n6J[
data.cbSize=sizeof(NOTIFYICONDATA); ? FGzw
data.hWnd=GetSafeHwnd(); ~w_4
nE
data.uID=98; 4wk-f7I(
Shell_NotifyIcon(NIM_DELETE,&data); GVhO}m
ShowWindow(SW_SHOW); h
U\)CM
SetForegroundWindow(); {>PN}fk2QP
ShowWindow(SW_SHOWNORMAL); 6A&e2K> A
bTray=FALSE; /`McKYIP
} K<TVp;N
$<cio
X
void CCaptureDlg::OnChange() G5a PjP
{ (ZH5/VKp
RegisterHotkey(); |:BKexjHL
} Fr_esx
&'4{/Gz
BOOL CCaptureDlg::RegisterHotkey() W/q-^Zkt,9
{ <+I^K 7
UpdateData(); qDHiyg^u
UCHAR mask=0; 03$-U0.;-
UCHAR key=0; (7/fsfsF
if(m_bControl) `B'*ln'r5
mask|=4; $8zsqd 4?
if(m_bAlt) K=T]@ix$
mask|=2; 8|*#r[x
if(m_bShift) Z^5j.d{e$
mask|=1; HxCq6Y_m<
key=Key_Table[m_Key.GetCurSel()]; G8b/eWtP
if(bRegistered){ A[)od
DeleteHotkey(GetSafeHwnd(),cKey,cMask); RP 'VEJ
bRegistered=FALSE; :ZG^`H/X1d
} &9X`tCnL
cMask=mask; -;9pZ'r
cKey=key; |`d,r.+P7
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ['~j1!/;6
return bRegistered; '?7th>pC
} j}$dYbf$
WwG +Xa
四、小结 jR-DH]@y
&S[tI$
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。