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:
>4Fdxa
*GB$sXF 一、实现方法
8cequAD g8B&u u # 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:
i$2MjFC- HM;4=% #pragma data_seg("shareddata")
k0R,!F HHOOK hHook =NULL; //钩子句柄
[ )B@ UINT nHookCount =0; //挂接的程序数目
puk4D static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
agGgJ@ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
I-j(e)P(o_ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
C5d/)aC static int KeyCount =0;
4t"* )xy static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
an #jZ[ #pragma data_seg()
t/_\U=i$ ei(|5h 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。
R#rh \Gv- sA 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:
`\6 +z 4ZSfz#<[z BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
K4BTk! cKey,UCHAR cMask)
i]V
F'tG {
1/F<T BOOL bAdded=FALSE;
* ,|)~$=> for(int index=0;index<MAX_KEY;index++){
QLxXp if(hCallWnd[index]==0){
BNF++<s hCallWnd[index]=hWnd;
s2kGU^]y HotKey[index]=cKey;
#p;4:IT HotKeyMask[index]=cMask;
vWZ>Hf]`L bAdded=TRUE;
_
+u sn. KeyCount++;
|8b$x| B break;
|Sy}d[VKsZ }
+<vqkc }
)@?Qt2 return bAdded;
fLf#2EA }
jauc*347 //删除热键
&^"s=g. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+A;n*DF2 {
+;{rU& BOOL bRemoved=FALSE;
,=x.aX
Spz for(int index=0;index<MAX_KEY;index++){
ixoMccU0 if(hCallWnd[index]==hWnd){
$L $j
KNwf if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
S+4I[|T]Y hCallWnd[index]=NULL;
YLr%vnO*NS HotKey[index]=0;
>&4I.nA HotKeyMask[index]=0;
(Qw`%B bRemoved=TRUE;
Y,p2eAss KeyCount--;
exGhkt~ break;
UeIqAG 8 }
mCZF5r }
CYY
X\^hA }
j X^&4f return bRemoved;
!c3Qcva }
2\kC_o97 VhJyWH%( @Wlwt+;fT DLL中的钩子函数如下:
i:NJ>b aH~x7N6! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Z &ua,:5 {
0D W'(#` BOOL bProcessed=FALSE;
e%5'(V-y, if(HC_ACTION==nCode)
\ZmFH8=|f {
98<bF{#0WM if((lParam&0xc0000000)==0xc0000000){// 有键松开
h[M6. switch(wParam)
AOq9v~)z- {
tOp:e KN case VK_MENU:
ZKiL-^dob MaskBits&=~ALTBIT;
N69eIdl break;
Q*oA{eZY case VK_CONTROL:
g6k&c"%IQ( MaskBits&=~CTRLBIT;
JCQx8;V%I break;
.T
N`p* case VK_SHIFT:
bHlD m~5 MaskBits&=~SHIFTBIT;
.jrR4@ break;
9, sCJ5bb" default: //judge the key and send message
V8| q"UX break;
%s&E-*X }
&,6y(- for(int index=0;index<MAX_KEY;index++){
e{#a{`?Uez if(hCallWnd[index]==NULL)
%^)Ja EUC continue;
nOL 25 Y: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fTi{oY,zTg {
ft.}$8vIT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Y ~\`0?ST bProcessed=TRUE;
VAG+y/q }
zN8&M<mTl }
^`B##9g~ }
dcc%G7w else if((lParam&0xc000ffff)==1){ //有键按下
>(1_Dn\ switch(wParam)
^~*[~ {
OL6xMToP case VK_MENU:
Xk$l-Zfse MaskBits|=ALTBIT;
g}s-v?+ break;
%o_0M^3W case VK_CONTROL:
g)|++? MaskBits|=CTRLBIT;
3
MI ) E break;
:w&)XI34 case VK_SHIFT:
~*Sbn~U MaskBits|=SHIFTBIT;
%I2xK.8= break;
2 |kH% default: //judge the key and send message
DRFuvU+e break;
X?k V1 }
4q2=:"z4 for(int index=0;index<MAX_KEY;index++){
O'yjB$j if(hCallWnd[index]==NULL)
")[Q4H;V continue;
8bKWIN g_n if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{"@b` {
r&l*.C* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`__?7"p
)\ bProcessed=TRUE;
E?c{02fu }
^:rNoo }
GJl@ag5h]! }
+8@`lDnr if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&l!{!f4 for(int index=0;index<MAX_KEY;index++){
po](6V if(hCallWnd[index]==NULL)
{ ves@p>? continue;
35]G_\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>cr_^(UW& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
> Qbc(}w //lParam的意义可看MSDN中WM_KEYDOWN部分
?U9d3] W }
p9] 7g% }
2ZzD^:V[} }
+h vIJv ? return CallNextHookEx( hHook, nCode, wParam, lParam );
l!2Z`D_MD }
U(&nh? '|A5a+[ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
xvz5\s|b ;
K
6Fe) BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Z!=Pc$? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
D A)0Y_ bCx1g/
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:
cTIwA:)D CTrs\G LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
BQJ`vIa {
D``NQ`>A if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
H6 f; BS {
_2Xu1q.6~5 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
_=^hnv SaveBmp();
m-KK
{{ return FALSE;
elHarey`f }
LXfeXWw?, …… //其它处理及默认处理
';CuJXAj }
[+cnx21{ 'LLQ[JJ=O -$MC 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。
"i<3}6/* MHT,rqG 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。
w5/X{ `zOAltfd 二、编程步骤
<B{VL8IA> Wv*BwiQ 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";
$^D(% (>5VS 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
yLIj4bf :AcNb 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
VOK$;s'9} %oL&~6l$ 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;
SoGLsO+R f]6`GsE 5、 添加代码,编译运行程序。
[W|7r
n,q sluZ-,zE 三、程序代码
j[ZniD xW;[}t-QS ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
>@89k^#Vc #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
8\V>6^3CD$ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
,4T$ #if _MSC_VER > 1000
'e)ze^Jq #pragma once
yc4f\0B/ #endif // _MSC_VER > 1000
y#Sw>-zRq #ifndef __AFXWIN_H__
0B:{4Lsn& #error include 'stdafx.h' before including this file for PCH
r~!%w(N|M #endif
pmD-]0 #include "resource.h" // main symbols
gx9sBkoq5D class CHookApp : public CWinApp
*]| JX& {
GvtI-\h] public:
V5@[7ncVf CHookApp();
ue:P#] tx // Overrides
>W]"a3E // ClassWizard generated virtual function overrides
-:p1gg& //{{AFX_VIRTUAL(CHookApp)
+PXfr~ 4 public:
Dt'e<d Is virtual BOOL InitInstance();
CZ%"Pqy&1L virtual int ExitInstance();
whZ],R*u //}}AFX_VIRTUAL
#2'&=?J1r //{{AFX_MSG(CHookApp)
N4(VRA // NOTE - the ClassWizard will add and remove member functions here.
)n[Mh!mn // DO NOT EDIT what you see in these blocks of generated code !
<mgTWv //}}AFX_MSG
WuZn|j' DECLARE_MESSAGE_MAP()
iZUz6 };
\bl,_{z? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
@' :um BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
^^Q32XC, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
8jGoU9 BOOL InitHotkey();
`ip69 IF2* BOOL UnInit();
%f(.OR)6{ #endif
R.'Gg _p2<7x i
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
2Xs < 1rF #include "stdafx.h"
$"n)C #include "hook.h"
<=2*UD | #include <windowsx.h>
k*6eZ 7 #ifdef _DEBUG
/2V',0 #define new DEBUG_NEW
Wv/5#_ #undef THIS_FILE
qa`(,iN static char THIS_FILE[] = __FILE__;
A-!qO|E[- #endif
R$m?&1K #define MAX_KEY 100
fTtSx_}3H #define CTRLBIT 0x04
vjRD?kF #define ALTBIT 0x02
6}lEeMRW #define SHIFTBIT 0x01
959jp85 #pragma data_seg("shareddata")
H0NyxG< HHOOK hHook =NULL;
dY`J,s UINT nHookCount =0;
R:m=HS_ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
QD VA*6F static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
DJjDKVO5t static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
>mSl~.I2 static int KeyCount =0;
#@"rp]1xv static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
_\[JMhd} #pragma data_seg()
neH"ks5 HINSTANCE hins;
+Z(VWu6 void VerifyWindow();
#X_ M BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
uQ+$Hzx X //{{AFX_MSG_MAP(CHookApp)
V)jhyCL // NOTE - the ClassWizard will add and remove mapping macros here.
YVp0}m // DO NOT EDIT what you see in these blocks of generated code!
' *C)S //}}AFX_MSG_MAP
(\Zo"x;( END_MESSAGE_MAP()
cU[pneY Px&Mi:4tG CHookApp::CHookApp()
boB{Y 7gO4 {
*0ntx$M-w // TODO: add construction code here,
;| ,Y2?
// Place all significant initialization in InitInstance
3H%WB| }
LB+=?Mz V %b4(wn?n:B CHookApp theApp;
<q=B(J' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
EPnB%'l\c {
t^;Fq{> BOOL bProcessed=FALSE;
SntYi0,` if(HC_ACTION==nCode)
*heQ@ww {
O~]G(TMs8W if((lParam&0xc0000000)==0xc0000000){// Key up
&}=,8Gt1G switch(wParam)
Ap9wH[H {
hrt-<7U case VK_MENU:
:e vc MaskBits&=~ALTBIT;
/! G0 g%k break;
ee` =B case VK_CONTROL:
Vo8"/]_h MaskBits&=~CTRLBIT;
?+L6o C.; break;
*j :5 case VK_SHIFT:
"evV/Fg( MaskBits&=~SHIFTBIT;
K%Ml2V
break;
g<3>7&^ default: //judge the key and send message
9DKB+K.1 break;
>;?97'M }
D8XXm lo for(int index=0;index<MAX_KEY;index++){
a,9GSKXo1 if(hCallWnd[index]==NULL)
sxa
( continue;
VH65=9z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
KphEw[4/ {
}epN<DL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
_%!hkc( bProcessed=TRUE;
/omVMu }
Sp:de,9@ }
.?:~s8kB }
}1 ^.A84a else if((lParam&0xc000ffff)==1){ //Key down
M/;g|J
jM switch(wParam)
^Tmmx_Xw {
6nhB1Aei case VK_MENU:
OPjh"Hv MaskBits|=ALTBIT;
3W0:0I break;
)}5rs case VK_CONTROL:
b=EZtk6> MaskBits|=CTRLBIT;
9Ua@- break;
}$U6lh/Ep case VK_SHIFT:
1t'\! MaskBits|=SHIFTBIT;
"rJL ^ \r break;
')<$AMy1 default: //judge the key and send message
5o#8DIal break;
_;W|iUreb }
}qPo%T for(int index=0;index<MAX_KEY;index++)
8^T$6A[b {
{eV_+@dT if(hCallWnd[index]==NULL)
u1<kdTxA
N continue;
[%:NR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Pp!W$C: {
`BY`ltW SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
eD0@n
: bProcessed=TRUE;
N%yFL }
en)DN3 }
b
L~<~gA }
eyV904<F if(!bProcessed){
.jw)e!<\N for(int index=0;index<MAX_KEY;index++){
=Y0m;-1M if(hCallWnd[index]==NULL)
MvFXVCT# continue;
RR|Eqm3) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.EQFHStr SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
ln7.>.F }
/2 N%Z }
eKOTxv{ }
mH"`46 return CallNextHookEx( hHook, nCode, wParam, lParam );
Q<qIlNE }
@hPbD?)M Ja1*a,],L BOOL InitHotkey()
mHy]$Z {
2BY:qz%: if(hHook!=NULL){
!$HWUxM;p nHookCount++;
jL<.?HE return TRUE;
X(9Ff=0.~ }
KNhH4K2iP8 else
DGnswN%n1 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
lLv0lf if(hHook!=NULL)
{[+gM? nHookCount++;
cAS5&T< return (hHook!=NULL);
HS7!O }
EC0auB7G BOOL UnInit()
r{_'2Z_i {
<[bDNe["? if(nHookCount>1){
I\_ R&
v nHookCount--;
;z#9>99rH return TRUE;
{JJ`|*H$_ }
*(rE< BOOL unhooked = UnhookWindowsHookEx(hHook);
l{4\Wn Va if(unhooked==TRUE){
|%} ?*|- nHookCount=0;
4=Zlsp hHook=NULL;
_1~Sj* }
` {p5SYj return unhooked;
&k nnWm" }
bvG
Vfr " >vhyKq|g< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
i y 5 {
ZpyRvDz BOOL bAdded=FALSE;
tznT*EQr for(int index=0;index<MAX_KEY;index++){
RfD$@q9 if(hCallWnd[index]==0){
Y~6pJNR hCallWnd[index]=hWnd;
gE&f}M- HotKey[index]=cKey;
E:ytdaiT HotKeyMask[index]=cMask;
7blZAA?- bAdded=TRUE;
1 /`>Eh KeyCount++;
Dcf`+?3 break;
[Zf<r1m }
V-31x ) }
:Z)s'd. return bAdded;
8"@<s?0\" }
&zR}jD>
,Xw/
t> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
m`|Z1CT {
1NTe@r!y BOOL bRemoved=FALSE;
U7W ct % for(int index=0;index<MAX_KEY;index++){
6!$S1z#wM if(hCallWnd[index]==hWnd){
bu.36\78 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
;"3Mm$ hCallWnd[index]=NULL;
4 R]| HotKey[index]=0;
{:Q2Itsy HotKeyMask[index]=0;
|Yx8Ez bRemoved=TRUE;
:1iw_GhJf KeyCount--;
O]>Or3oO break;
km^AX:r1 }
z(ajR*\# }
B@4#y9`5 }
E_OLf%um return bRemoved;
x[X.// : }
xfzR>NU u0,~pJvX void VerifyWindow()
`'>>[*06:a {
La!PGZ{ for(int i=0;i<MAX_KEY;i++){
p4[W@JV if(hCallWnd
!=NULL){ 5^xt/vYa)
if(!IsWindow(hCallWnd)){ 5FMKJ7sC9
hCallWnd=NULL; -H
\nFJ6+
HotKey=0; H`P )
HotKeyMask=0; L81"W`?
KeyCount--; O
Rfl v+
} -'nx7wnj2
} 3"".kf,O5e
} HOw hl
} _eF*8 /z
,%C$~+xjM
BOOL CHookApp::InitInstance() (mEZ4yM
{ l*eA
?Qz
AFX_MANAGE_STATE(AfxGetStaticModuleState()); @6E[K'5c1
hins=AfxGetInstanceHandle(); s2E}+
#
InitHotkey(); kxP6#8*:
return CWinApp::InitInstance(); bY<" $);s
} jC
oZm(bi
M;E&@[5
int CHookApp::ExitInstance() I9MI}0}7
{ %nIjRmqM~
VerifyWindow(); oeIS&O.K
UnInit(); M]W4S4&Y=
return CWinApp::ExitInstance(); rEViw?^KT
} S.I<Hs
<[q)2 5RL
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A-~)7-
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gp}S 1
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k4@GjO1"$
#if _MSC_VER > 1000 (X8N?tJ
#pragma once L]VK9qB
#endif // _MSC_VER > 1000 }N[sydL
dug RO[
class CCaptureDlg : public CDialog PyoLk
{ 4e:hKv,+4
// Construction qUo(hbp
public: `XD$1>
BOOL bTray; q<1@ut
BOOL bRegistered; K,R Ia0)
BOOL RegisterHotkey(); O~D}&M@/R
UCHAR cKey; 6hZhD1lDG^
UCHAR cMask; #<JrSl62(K
void DeleteIcon(); G{J9Fb8
void AddIcon(); %H@fVWe2wT
UINT nCount; }X$>84s>[P
void SaveBmp(); 5ZSw0A(w
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5t PmrWZ
// Dialog Data $&4Z w6"=
//{{AFX_DATA(CCaptureDlg) 5!Guf?i
enum { IDD = IDD_CAPTURE_DIALOG }; s)C.e# xl
CComboBox m_Key; =m40{
BOOL m_bControl; Pg:Nz@CQ
BOOL m_bAlt; eY-$hnUe
BOOL m_bShift; u0x\5!?2
CString m_Path;
i"b*U5k
CString m_Number; Y8d%L;b[D
//}}AFX_DATA YONg1.^!(
// ClassWizard generated virtual function overrides JmBYD[h,
//{{AFX_VIRTUAL(CCaptureDlg) *)w
8fq
public: CkP!4^J qQ
virtual BOOL PreTranslateMessage(MSG* pMsg); 1?*vqdt
protected: "}!vYr
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _E~uuFMn*R
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); OS!47Z /q
//}}AFX_VIRTUAL # WxH
// Implementation c(~M<nL0
protected: 5E%W;$3Pb
HICON m_hIcon; HiWZ?G
// Generated message map functions l/`Z+];
//{{AFX_MSG(CCaptureDlg) 5p~Z-kU&
virtual BOOL OnInitDialog(); B<oi,S
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ywni2-)<
afx_msg void OnPaint(); 3w-0v"j U
afx_msg HCURSOR OnQueryDragIcon(); mF_/Rhu
virtual void OnCancel(); $q+7,,"
afx_msg void OnAbout(); snK/,lm.
afx_msg void OnBrowse(); [Nq4<NK
afx_msg void OnChange(); H 95VU"
//}}AFX_MSG mr;WxxO5
DECLARE_MESSAGE_MAP() A[b'MNsv
}; x&f?c=\F
#endif >1r>cZn
7#RW4ZM
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -AbA6_j
#include "stdafx.h" 6q5V*sJ&
#include "Capture.h" AXJC&O}`
#include "CaptureDlg.h" \UiuJ+
#include <windowsx.h> H: U_k68
#pragma comment(lib,"hook.lib") u_uC78`p
#ifdef _DEBUG )I*V('R6|
#define new DEBUG_NEW 86I".R$d
#undef THIS_FILE >
4^U=T#
static char THIS_FILE[] = __FILE__; E{FN sa
#endif y_'8m9Qy)
#define IDM_SHELL WM_USER+1 WgY3g1C
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n"Ev25%
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?6[>HX;
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s2tEyR+gW
class CAboutDlg : public CDialog 8g$ 8]'M^T
{ V9MA)If>
public: ^awl-CG
CAboutDlg(); f5O*Njl
// Dialog Data 0!^{V:DtQ
//{{AFX_DATA(CAboutDlg) 20J:_+=]
enum { IDD = IDD_ABOUTBOX }; "\BLi C
//}}AFX_DATA -j(/5.a
// ClassWizard generated virtual function overrides aWit^dp
//{{AFX_VIRTUAL(CAboutDlg) \=QG6&_
protected: SY)o<MD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;mMn-+ 3<
//}}AFX_VIRTUAL C|>#|5XaF
// Implementation 9eV@v
protected: = 7jkW (Q
//{{AFX_MSG(CAboutDlg) aC:rrS
//}}AFX_MSG _{A($/~c?
DECLARE_MESSAGE_MAP() UH)A n:9
}; Z(V4"x7F
pIh@!C
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) } wiq?dr
{ BKGwi2]Ry
//{{AFX_DATA_INIT(CAboutDlg) ){6;o&CC:
//}}AFX_DATA_INIT T$+}Srb
} 'SuYNA)
pE=wP/#
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]-0
&[@I4@
{ [H"Ods~_`
CDialog::DoDataExchange(pDX); 79i>@u%
//{{AFX_DATA_MAP(CAboutDlg) O ~"^\]\
//}}AFX_DATA_MAP 9zX\ioT
} 7qs[t7-h?
,,i;6q_f
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F35e/YfG
//{{AFX_MSG_MAP(CAboutDlg) \tQRyj\|
// No message handlers &"d4J?io`
//}}AFX_MSG_MAP
LDbo
END_MESSAGE_MAP() ]ao]?=q C
=n;ileGm+^
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ((H}d?^AJ
: CDialog(CCaptureDlg::IDD, pParent) 5:YtBdP
{ H
>RGX#|
//{{AFX_DATA_INIT(CCaptureDlg) +pDuRr
m_bControl = FALSE; XX/cJp
m_bAlt = FALSE; {gJOc,U4b
m_bShift = FALSE; ny#7iz/
m_Path = _T("c:\\"); ;Yi ;2ttW
m_Number = _T("0 picture captured."); C=.
nCount=0; bd%/dr
bRegistered=FALSE; z/;NoQ-
bTray=FALSE; M T{^=F ]
//}}AFX_DATA_INIT ($ae n
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 NjMo"1d
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !QYqRH~5
} d`v]+HK
ty(F;M(
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {lqnn n3
{ \b'
<q
CDialog::DoDataExchange(pDX); bZ0r/f,n$
//{{AFX_DATA_MAP(CCaptureDlg) c.NAUe_3
DDX_Control(pDX, IDC_KEY, m_Key); .lqo>Ta
y
DDX_Check(pDX, IDC_CONTROL, m_bControl); rJR"[TTJ
DDX_Check(pDX, IDC_ALT, m_bAlt);
}mX;0qO
DDX_Check(pDX, IDC_SHIFT, m_bShift); q7X/"Dfx
DDX_Text(pDX, IDC_PATH, m_Path); V-t!
DDX_Text(pDX, IDC_NUMBER, m_Number); :^px1
//}}AFX_DATA_MAP 4Jht{#IIG
} B:Msn)C~
sfx:j~bsL
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _<xU"8b"5
//{{AFX_MSG_MAP(CCaptureDlg) xH*OEzN
ON_WM_SYSCOMMAND() Ff.gRx
ON_WM_PAINT() /\C9FGS
ON_WM_QUERYDRAGICON() vk{dL'
ON_BN_CLICKED(ID_ABOUT, OnAbout) &x\u.wIa
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {GZHD^Ce
ON_BN_CLICKED(ID_CHANGE, OnChange) 3vmZB2QG
//}}AFX_MSG_MAP MT a.Ubs
END_MESSAGE_MAP()
_ 57m] ;&
Y]ZOvA5W
BOOL CCaptureDlg::OnInitDialog() t R*JM$T
{ fNQ.FAK":
CDialog::OnInitDialog(); FJ~Dg3F1
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); VNaa(Q
ASSERT(IDM_ABOUTBOX < 0xF000); tZ4W]od
CMenu* pSysMenu = GetSystemMenu(FALSE); )PR{ia64;<
if (pSysMenu != NULL) Z1*y$=D?3[
{ E5.)ro=$
CString strAboutMenu; /J1O{L
strAboutMenu.LoadString(IDS_ABOUTBOX); *"4
OXyV
if (!strAboutMenu.IsEmpty()) ;Q-(tGd
{ (%\N-[yZ
pSysMenu->AppendMenu(MF_SEPARATOR); hCc I
>[H5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2v yB[(
} iv\?TAZC
} {cC9
}w
SetIcon(m_hIcon, TRUE); // Set big icon .~C*7_
SetIcon(m_hIcon, FALSE); // Set small icon |VTm5.23
m_Key.SetCurSel(0); nB"q
RegisterHotkey(); "o%N`Xlx
CMenu* pMenu=GetSystemMenu(FALSE); %Wn/)#T|
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~E#>2Mh
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9fyk7~V
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); vlx
wt~
return TRUE; // return TRUE unless you set the focus to a control O Y /QA
} ss
|<\DE+
omY%sQ{)
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <(;"L<?D<C
{ s+^YGB
if ((nID & 0xFFF0) == IDM_ABOUTBOX) mJ[LmQ<:
{ 'V .4Nhd
CAboutDlg dlgAbout; Spt[b.4m F
dlgAbout.DoModal(); EzwYqw
} /6b(w=pk
else N%n#mV;
{ if
r!ha+8!
CDialog::OnSysCommand(nID, lParam); Nmns3D
} }8 fG+H.
} ]MRE^Je\h
U*1rA/"n
void CCaptureDlg::OnPaint() rB)m{)
{ 'GS1"rkW<5
if (IsIconic()) A\k@9w\Ll;
{ % ;09J
CPaintDC dc(this); // device context for painting -Z)$].~|t
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ct fKxGH
// Center icon in client rectangle DSD#',
int cxIcon = GetSystemMetrics(SM_CXICON); \snbU'lfP
int cyIcon = GetSystemMetrics(SM_CYICON); H>a3\M
CRect rect;
VTy!<I
GetClientRect(&rect); 3Ud&B
int x = (rect.Width() - cxIcon + 1) / 2; 'R99kL/.N
int y = (rect.Height() - cyIcon + 1) / 2; s>E4.0[I%
// Draw the icon |l`X]dsfQ
dc.DrawIcon(x, y, m_hIcon); R84g<
} 2-. g>'W
else D3vd O2H
{ ,m9Nd "6\
CDialog::OnPaint(); A:0
} L*Xn!d%
} m},nKsO
wnN@aO6g*
HCURSOR CCaptureDlg::OnQueryDragIcon() dGrOw)
{ I?Hj,lN
return (HCURSOR) m_hIcon; .9S
} 3@\vU~=P:
[AfV+$
void CCaptureDlg::OnCancel() (/Hq8o-Fw
{ \bZbz/+D
if(bTray) M
+~guTh
DeleteIcon(); WQ|d;[E
CDialog::OnCancel(); VEd\*
} i=#r JK=
u,*$n'l]
void CCaptureDlg::OnAbout() \/. Of]YQ
{ 4cTJ$" v
CAboutDlg dlg; &W)ks
dlg.DoModal(); &B/cy<;y,
} *<OWd'LI
w[n|Sauy,
void CCaptureDlg::OnBrowse() 3T|:1Nw
{ gjk=`lU
CString str; VgN`'
iC`I
BROWSEINFO bi; VABrw t
char name[MAX_PATH]; ig7)VKr
ZeroMemory(&bi,sizeof(BROWSEINFO)); g*AnrQ}P
bi.hwndOwner=GetSafeHwnd(); 6oL-Atf
bi.pszDisplayName=name; 5MO:hE5sm
bi.lpszTitle="Select folder"; BAx)R6kS;
bi.ulFlags=BIF_RETURNONLYFSDIRS; JOx75}
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^Qs-@]E-
if(idl==NULL) {uDL"~^\
return; ak;fCx&
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hJrxb<9@Y0
str.ReleaseBuffer(); P5%DvZB$w
m_Path=str; \"<&8
if(str.GetAt(str.GetLength()-1)!='\\') P (_:8|E
m_Path+="\\"; f)vD2_E
UpdateData(FALSE); jCtl
]
} r9yUye}
<xOpm8
void CCaptureDlg::SaveBmp() 8L|rj4z<#
{ 7'xT)~*$4
CDC dc; 7"Zr:|$U
dc.CreateDC("DISPLAY",NULL,NULL,NULL); e*jn7aya
CBitmap bm; V89!C?.[]1
int Width=GetSystemMetrics(SM_CXSCREEN); 7Q/v#_e(
int Height=GetSystemMetrics(SM_CYSCREEN); LGgEq-
bm.CreateCompatibleBitmap(&dc,Width,Height); |&o1i~Y
CDC tdc; BB1'B-O
tdc.CreateCompatibleDC(&dc); K/,
B
CBitmap*pOld=tdc.SelectObject(&bm); J3}^\k=p"
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +pnT6kU|
tdc.SelectObject(pOld); )><cL:IJ}S
BITMAP btm; t'Nu^_#
bm.GetBitmap(&btm); |0b$60m$!t
DWORD size=btm.bmWidthBytes*btm.bmHeight; GQ$0`?lp
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); aGr(djD
BITMAPINFOHEADER bih; (t&P.N/
bih.biBitCount=btm.bmBitsPixel; /#G^?2oM
bih.biClrImportant=0; O (tcu@vfl
bih.biClrUsed=0; BO#fzq%
bih.biCompression=0; fp:j~a>E
bih.biHeight=btm.bmHeight; '_4u,
\SG
bih.biPlanes=1; !,V8?3.aJn
bih.biSize=sizeof(BITMAPINFOHEADER); `i9WnPRt
bih.biSizeImage=size; *J 7>6N:-
bih.biWidth=btm.bmWidth; s^AQJ{X
bih.biXPelsPerMeter=0; %$:js4
bih.biYPelsPerMeter=0; st:[|`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !Z<GUblt
static int filecount=0; S2*-UluG
CString name; )tz8(S
name.Format("pict%04d.bmp",filecount++); Y~,[9:SR
name=m_Path+name; XqyfeY5t
BITMAPFILEHEADER bfh; VCX})sp
bfh.bfReserved1=bfh.bfReserved2=0; E"x 2 jP
bfh.bfType=((WORD)('M'<< 8)|'B');
;TEZD70r
bfh.bfSize=54+size; YEXJh!X
bfh.bfOffBits=54; aCM F[
3j
CFile bf; c_kxjzA#
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Yn'XSV|g
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1;?b-FEq:
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dWg$yH
bf.WriteHuge(lpData,size); tJ&S&[}
bf.Close(); H_o<!YxK
nCount++;
&j2L-)
} V<\:iNXX{
GlobalFreePtr(lpData); b0rC\^x
if(nCount==1) A:cc @ku
m_Number.Format("%d picture captured.",nCount); ?$ Uk[
else IgptiZ7~!
m_Number.Format("%d pictures captured.",nCount); w44{~[0d4
UpdateData(FALSE); +S<2d.&~
} s%H5Qa+Uh
*NFy%ktu
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $gJMF(
{ YxGIv8O]
if(pMsg -> message == WM_KEYDOWN) !MTm4Ls
{ AZI%KM[
if(pMsg -> wParam == VK_ESCAPE) pn{.oXomf
return TRUE; $qP9EZ]JC
if(pMsg -> wParam == VK_RETURN) .^,fw=T|1
return TRUE; 6$%]p1"!K
} jQ%}e"
return CDialog::PreTranslateMessage(pMsg); !r.X. C
} .: 87B=
K%2,z3ps
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FOquQr1cF
{ |b'tf:l
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e&<#8;2X
SaveBmp(); yJ/m21f
return FALSE; oT\B-lx
} ;}.jRmnJ
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !}l)okQH<#
CMenu pop; ag:#82C
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); VBIPB
CMenu*pMenu=pop.GetSubMenu(0); BXZ( %tnY
pMenu->SetDefaultItem(ID_EXITICON); v$+G_ @
CPoint pt; i._d^lR\t
GetCursorPos(&pt); K{x<zv&,
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =y0!-y
if(id==ID_EXITICON) lBD{)Va
DeleteIcon(); y!blp>V6
else if(id==ID_EXIT) CW*6 -q
OnCancel(); U87VaUr
return FALSE; [0m'a\YE9
} o:f=dBmoX
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h'MX{Wm.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }1:jM_H)k
AddIcon(); }x~|XbG
return res; o!sxfJKl
} k3sP,opacX
$Z.c9rY1
void CCaptureDlg::AddIcon() unSF;S<
{ Q\m"n^XN
NOTIFYICONDATA data; xDRK^nmC
data.cbSize=sizeof(NOTIFYICONDATA); >J.a,!
CString tip; E+JGqk
tip.LoadString(IDS_ICONTIP); Y0&w;P
data.hIcon=GetIcon(0); AJCWp4,
data.hWnd=GetSafeHwnd(); X
H{5E4P
strcpy(data.szTip,tip); BL]!j#''KE
data.uCallbackMessage=IDM_SHELL; yoGE#+|7^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _YmYy\g
data.uID=98; |pq z(j7
Shell_NotifyIcon(NIM_ADD,&data); _^#PV}
ShowWindow(SW_HIDE); +\"@2mOH{+
bTray=TRUE; WuSRA<{P
} azj<aaH
Y49kq}
void CCaptureDlg::DeleteIcon() rH8?GR0<
{ _q3SR[k+`
NOTIFYICONDATA data; ir \ d8.
data.cbSize=sizeof(NOTIFYICONDATA); djZOx;/
data.hWnd=GetSafeHwnd(); P)(Ly5$*
data.uID=98; z<: 9,wtbP
Shell_NotifyIcon(NIM_DELETE,&data); 7:jSP$
ShowWindow(SW_SHOW); %do|>7MO@
SetForegroundWindow(); YjvqU /[3
ShowWindow(SW_SHOWNORMAL); 'G@Npp)&^
bTray=FALSE; /bt@HFL|`
} {;f`t3D
@B7;
void CCaptureDlg::OnChange() _ky!4^B
{ 0kmVP~K
RegisterHotkey(); &|/C*2A
} IL YS:c58=
T{?!sB3
BOOL CCaptureDlg::RegisterHotkey() X k<X:,T
{ sJ3HH0e
UpdateData(); _.?$~;7
UCHAR mask=0; kIU"-;5tP
UCHAR key=0; <:q]t6]$
if(m_bControl) JOenVepQ,
mask|=4; J5@_OIc1y
if(m_bAlt) "W\
#d
mask|=2; &NHIX(b6
if(m_bShift) D2>=^WP6+
mask|=1; "84.qgYaG
key=Key_Table[m_Key.GetCurSel()]; #V4_. t#
if(bRegistered){ @@SG0YxZ
DeleteHotkey(GetSafeHwnd(),cKey,cMask); A' dt
WD
bRegistered=FALSE; WdunI~&.
} _wZ(%(^I
cMask=mask; /x0zZ+}V
cKey=key; M~ynJ@q
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); z4UeUVfZ}
return bRegistered; Pg*ZQE[ME8
} D'uzH|z8
sx`C<c~u
四、小结 WXO@oZ!
zcIZJVYA
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。