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:
r+S;B[Vd
>F[GVmC 一、实现方法
KQ{Lt?S <
bFy(+ 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:
2n)gpLIJ {q,?<zBzu #pragma data_seg("shareddata")
Qdu$Os HHOOK hHook =NULL; //钩子句柄
vd (?$ UINT nHookCount =0; //挂接的程序数目
ARF\fF|<2 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
1k[GuG%/K static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
\}#@9= static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Z5B/|{ static int KeyCount =0;
mj2Pk,,SA static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
jO8X:j09A #pragma data_seg()
$:EG%jl Uw)=WImz[ 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。
]
8Tzr 6+3 $:? 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:
"|t!7hC sn"fK=,#g BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
SkHYXe"] cKey,UCHAR cMask)
_ie.| 4k {
I9&lO/c0 BOOL bAdded=FALSE;
I\zemW! for(int index=0;index<MAX_KEY;index++){
E^wyD-ii/ if(hCallWnd[index]==0){
'#D8*OP^ hCallWnd[index]=hWnd;
I]R9HGJNlJ HotKey[index]=cKey;
}pawIf4V HotKeyMask[index]=cMask;
TSjIz5 bAdded=TRUE;
3vW4<:Lgy KeyCount++;
(0L=AxH break;
[T^?Q%h }
dJD(\a>r.u }
&|
!B!eOY return bAdded;
iZxt/}1X0 }
exZLj0kvF //删除热键
3^wC<ZXcD BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BzN@gQo {
|^( M{ BOOL bRemoved=FALSE;
rN5tI.iC for(int index=0;index<MAX_KEY;index++){
q3h'l, if(hCallWnd[index]==hWnd){
BBnq_w"a if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
7-*=|gl+ hCallWnd[index]=NULL;
V%NeZ1{ e HotKey[index]=0;
K_ke2{4Jm HotKeyMask[index]=0;
Sh&PNJ-* bRemoved=TRUE;
g"K>5Cb KeyCount--;
a#[-*ou` break;
3FNT|QF }
|=K_F3aJ }
(D7$$!} }
#;Tz[0 return bRemoved;
)`+YCCa6F }
pe.QiMW{8 <f>akT,W M%`\P\A DLL中的钩子函数如下:
E[g*O5 QlEd6^& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
vH[Pb#f- {
{mTytT BOOL bProcessed=FALSE;
42+#<U7T if(HC_ACTION==nCode)
;Ii1B{W {
_#C()Ro*P if((lParam&0xc0000000)==0xc0000000){// 有键松开
%j+xgX/& switch(wParam)
Y)|N"f; {
p&Ed\aQ%z; case VK_MENU:
_O]xey^r MaskBits&=~ALTBIT;
7%;_kFRV break;
p2% case VK_CONTROL:
)uheV,ZnY MaskBits&=~CTRLBIT;
}}r>
K} break;
FN^FvQ case VK_SHIFT:
~*.- MaskBits&=~SHIFTBIT;
'@=PGpRF break;
X}A'Cg0y default: //judge the key and send message
V/%~F6e break;
V diJ>d[ }
#FH[hRo=6 for(int index=0;index<MAX_KEY;index++){
v=?2S if(hCallWnd[index]==NULL)
s?C&s|'. continue;
@xAfZb2 E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z#6?8y2- {
,d_Gn! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.iwZ*b{ bProcessed=TRUE;
&
,hr8 }
YY5!_k }
A1i!F?X }
DAO]uh{6 else if((lParam&0xc000ffff)==1){ //有键按下
]!
*[Q\ switch(wParam)
z-T{~{q {
}q[Bd case VK_MENU:
>BVoHt~; MaskBits|=ALTBIT;
e' 9r"<>i break;
s60
TxB case VK_CONTROL:
L{fFC%|l2L MaskBits|=CTRLBIT;
Hi}RZMr1 break;
I5ZqB B case VK_SHIFT:
|>
enp> MaskBits|=SHIFTBIT;
9KuD(EJS break;
quxdG>8 default: //judge the key and send message
t18$x"\4k break;
`3_lI~=eH }
yxWO[ Z for(int index=0;index<MAX_KEY;index++){
ec3<%+0f if(hCallWnd[index]==NULL)
;2xO`[# continue;
9jir*UI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Af(WV>' {
ipE]}0q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<wd]D@l7r bProcessed=TRUE;
+9;2xya2 }
Z u*K-ep" }
sW@krBxMv }
s>n(`?@L if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
T^.Cc--c for(int index=0;index<MAX_KEY;index++){
aM3gRp51cj if(hCallWnd[index]==NULL)
Wr?'$: continue;
7:E!b=o# if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
K%5"u' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
o4y']JSN //lParam的意义可看MSDN中WM_KEYDOWN部分
~FU@wV^ }
/8'S1!zc }
x2Lq=zwJ }
eOT+'[3" return CallNextHookEx( hHook, nCode, wParam, lParam );
J @IS\9O }
qQ]]~F f .
}c7 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:
0E`1HP"b 5VW|fI BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
k?GD/$1t BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
iA
}vKQ w8Sv*K 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:
\*t~==WB _QOZsEe LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{-/^QX]6 {
AnBJ(h if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
NQHz<3S[ {
!~i'
-4] //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Z~ SaveBmp();
3>M&D20Z return FALSE;
kS5_
}
:iWS\G^U …… //其它处理及默认处理
B=f,QU }
zmuMWT; x Gk6n4Gg FDzqL;I 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。
OWq'[T4 \c,pEXG 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。
5*%#o da!P0x9p 二、编程步骤
]y{WD=T nuQ]8- , 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";
U&Wwyu:4i
pmvT$;7I 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
bBcp9C)iY n"Veem[_4g 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;
!%(h2]MQ /UcV 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;
uP $Cj zw<p74DH 5、 添加代码,编译运行程序。
yM.IxpT#$ ZFm`UXS 三、程序代码
K kW;-{c {=2DqkTD ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
G.VuKsP] #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
p/Sbt/R #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
uQ$^;Pr #if _MSC_VER > 1000
:'L2J #pragma once
?
8aaD>OR$ #endif // _MSC_VER > 1000
/wShUR{ #ifndef __AFXWIN_H__
~T7B$$ #error include 'stdafx.h' before including this file for PCH
+gd2|`# #endif
NH<gU_s8{9 #include "resource.h" // main symbols
qVqRf.-\ class CHookApp : public CWinApp
g6t"mkMY
L {
/hrT public:
O43YY2 CHookApp();
^[E'1$D // Overrides
Ox!U8g8c // ClassWizard generated virtual function overrides
Dn9w@KO //{{AFX_VIRTUAL(CHookApp)
%.v{N6 public:
p^kUs0$GS virtual BOOL InitInstance();
85:NFa@J virtual int ExitInstance();
%sBAl.!BN //}}AFX_VIRTUAL
&.13dq //{{AFX_MSG(CHookApp)
s'aip5P // NOTE - the ClassWizard will add and remove member functions here.
n"PJ,ao // DO NOT EDIT what you see in these blocks of generated code !
EI>6Nh //}}AFX_MSG
%=we`& DECLARE_MESSAGE_MAP()
'7Nr8D4L };
Y/<lWbj*A LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
'+>fFM,*B BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
/
O/`< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
UV
4>N BOOL InitHotkey();
RgdysyB BOOL UnInit();
BcjP+$k4_ #endif
`vG,}Pt] v44}%$ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
r[(xjn #include "stdafx.h"
5vAf7\* #include "hook.h"
WL,&-*JAW #include <windowsx.h>
rB~W Iu #ifdef _DEBUG
>KLtY|o) #define new DEBUG_NEW
=h6
sPJ #undef THIS_FILE
Snly UP~P static char THIS_FILE[] = __FILE__;
Pz#7h*;cw. #endif
9Ya<My #define MAX_KEY 100
c}*2$1 #define CTRLBIT 0x04
eivtH P #define ALTBIT 0x02
Ma *y=d;,1 #define SHIFTBIT 0x01
UUKP" #pragma data_seg("shareddata")
m"\:o HHOOK hHook =NULL;
,r^M?> UINT nHookCount =0;
4(neKr5\# static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
f %lD08Sl static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
S d/?& static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
/yz=Cj oz static int KeyCount =0;
L9Z;:``p static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Rgo rkZlVM #pragma data_seg()
<^~FLjsfg HINSTANCE hins;
4H5pr void VerifyWindow();
jN-vY<?h] BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
)D'^3)FF //{{AFX_MSG_MAP(CHookApp)
u<q :$ // NOTE - the ClassWizard will add and remove mapping macros here.
[XRCLi} // DO NOT EDIT what you see in these blocks of generated code!
\l"&A //}}AFX_MSG_MAP
%<?0apO END_MESSAGE_MAP()
E5el?=,i bPD`+:A_ CHookApp::CHookApp()
- K%,^6 {
k%wn0Erd // TODO: add construction code here,
Xtz-\v#0o' // Place all significant initialization in InitInstance
P1b'% }
pL1Q7&&c0 6iEhsL&K CHookApp theApp;
hmx=
35 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
9][(Iu]h7 {
qm Tb-~ BOOL bProcessed=FALSE;
YSJy` if(HC_ACTION==nCode)
F/m^?{==~* {
>&g}7d% if((lParam&0xc0000000)==0xc0000000){// Key up
'}g*!jL switch(wParam)
+X`V|E,no {
ri`R<l8 case VK_MENU:
$@d9<83= MaskBits&=~ALTBIT;
wiaX&-c]8 break;
;N B:e case VK_CONTROL:
<2!v(EkI MaskBits&=~CTRLBIT;
>{eCh$L break;
g~7Ri-" case VK_SHIFT:
FJ*i\Q/D MaskBits&=~SHIFTBIT;
Ftw;Yz break;
l$K,#P<) default: //judge the key and send message
AM"Nn
L" break;
)&era` e[ }
Uie?9&3 for(int index=0;index<MAX_KEY;index++){
O20M[_S if(hCallWnd[index]==NULL)
e{;OSk`x continue;
|9"p|6G?B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7&`}~$>}>e {
a9n^WOJ6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qQpnLV 4 bProcessed=TRUE;
(>mI'!4d }
YY?a>j."a }
/&u<TJ4 }
N=:5eAza else if((lParam&0xc000ffff)==1){ //Key down
Wv__ wZ switch(wParam)
`28};B> {
%}86D[PF case VK_MENU:
M
:3u@06a MaskBits|=ALTBIT;
B!gGK|8 break;
$F.([?)k? case VK_CONTROL:
ELh8ltLY MaskBits|=CTRLBIT;
Xi?b]Z break;
pE{yv1Yg case VK_SHIFT:
)$w*V9d MaskBits|=SHIFTBIT;
"#v=IJy&r break;
vHAg-Avc default: //judge the key and send message
\BWykA> break;
j1SMeDDM
~ }
Q0Nyqhvi for(int index=0;index<MAX_KEY;index++)
)uv=S;+ {
\MxoZ if(hCallWnd[index]==NULL)
QKN<+,h!z> continue;
DC1'Kyk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=#mTfJ {
k OvDl!^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
tvXW bProcessed=TRUE;
#j@71]GI }
'Dvv?>=& }
x^"ES%* }
ZKg{0DY if(!bProcessed){
Ca%g_B0t for(int index=0;index<MAX_KEY;index++){
^xf<nNF:p if(hCallWnd[index]==NULL)
axHK_1N{ continue;
h._nK\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
k{gLMl SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
C^QtSha }
9}B`uJ }
pV6d
Id }
K1V#cB
WO return CallNextHookEx( hHook, nCode, wParam, lParam );
Z/^ u }
&a/__c/l [D5t{[i BOOL InitHotkey()
7_2kDDW0 {
<foCb%$(? if(hHook!=NULL){
%>g W9}kB nHookCount++;
y9#$O(G return TRUE;
SXao|{?O }
p3/*fH98 else
tpy>OT$ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
6#j$GH * if(hHook!=NULL)
$3Z-)m nHookCount++;
kNu'AT#3| return (hHook!=NULL);
`h}q
Eo` }
7iJ&6=/ BOOL UnInit()
j@Yi`a(sdm {
0
ugT2% if(nHookCount>1){
JT
fd#g?I nHookCount--;
<p;k)S2J return TRUE;
/ywD{* }
DmXcPJ[9 BOOL unhooked = UnhookWindowsHookEx(hHook);
I\qYkWg7 if(unhooked==TRUE){
K[chjp!$l nHookCount=0;
pT?Q#,fh hHook=NULL;
yL;M"L }
n.hv!W0 return unhooked;
M MzGd:0b }
H3{GmV8 l!#m&'16" BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]|_\xO( {
<
j$#9QQ1 BOOL bAdded=FALSE;
"RVcA", for(int index=0;index<MAX_KEY;index++){
X7L8h'(@ if(hCallWnd[index]==0){
zrVC8Wb hCallWnd[index]=hWnd;
6h3HDFS7s HotKey[index]=cKey;
6Es?
MW= HotKeyMask[index]=cMask;
T32BnmB{ bAdded=TRUE;
y8VpFa KeyCount++;
(Qgde6 break;
2xw6 5z }
<8UYhGK }
fF*`'i=! return bAdded;
=h(W4scgqX }
h;5LgAY|v iJnU% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3D9!M- {
MxzLK%am BOOL bRemoved=FALSE;
Knhp*V? for(int index=0;index<MAX_KEY;index++){
q9"=mO0J+ if(hCallWnd[index]==hWnd){
,]}?.g if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
0J.dG/I% hCallWnd[index]=NULL;
zi~5l#I HotKey[index]=0;
?S?2 0 HotKeyMask[index]=0;
}HEvr)v9 bRemoved=TRUE;
,3I^?5 KeyCount--;
$./bjV% break;
Ifk#/d }
s] /tYJYl }
7VK}Dy/Vvn }
.oEmU+ return bRemoved;
X0{/ydGF8 }
1_$xSrwcF nN$Y(2ZN void VerifyWindow()
8Ry74|`=R {
5>6PH+Oq for(int i=0;i<MAX_KEY;i++){
M5T9JWbN if(hCallWnd
!=NULL){ xoB},Xl$D
if(!IsWindow(hCallWnd)){ k%[3Q>5iM
hCallWnd=NULL; xUF_1hY
HotKey=0; RvJ['(-
HotKeyMask=0; ,wKe
fpV;5
KeyCount--; "l={)=R
} vaf&X]p
} )'l*Tl
} A?G IBjs
} 4`#F^2r!
vi@Lz3}::
BOOL CHookApp::InitInstance() 39{{7(hh
{ B7\k< Nit0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); OdMO=Hy6d
hins=AfxGetInstanceHandle(); ?Z\Yu'
InitHotkey(); (><zsLs&
return CWinApp::InitInstance(); J==SZ v
} UR(-q
W~_t~Vg5
int CHookApp::ExitInstance() }0,>2TTDN
{ dk8wIa"K`
VerifyWindow(); elG;jB
UnInit(); UEak^Mm;=2
return CWinApp::ExitInstance(); 4Ij-Ilg)%
} i?Ss: v^
,wwZI`>-
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file > Oh?%%6
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P)dL?vkK
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ MJj4Hd
#if _MSC_VER > 1000 SM[Bv9|0
#pragma once 2A4FaBq"
#endif // _MSC_VER > 1000 8\<jyJ
`k\grr.J
class CCaptureDlg : public CDialog TI y&&_p
{ i`
A
// Construction M(|
public: S{',QO*D6
BOOL bTray; BiE08,nj
BOOL bRegistered; AvR2_
BOOL RegisterHotkey(); _<ut)G^9
UCHAR cKey; g%[n4
UCHAR cMask; /8@m<CW2Y
void DeleteIcon(); J H.K.C(
void AddIcon(); zr76_~B1u
UINT nCount; dQy>Nmfy
void SaveBmp(); wx=0'T-[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor =1dI>M>tm
// Dialog Data ^s\3/z>b4!
//{{AFX_DATA(CCaptureDlg) qdCWy
enum { IDD = IDD_CAPTURE_DIALOG }; {Hr$wa~
CComboBox m_Key; wLuv6\E
BOOL m_bControl; {|9}+
@5Q1
BOOL m_bAlt; 4t4olkK3Oa
BOOL m_bShift; QD{:vG
g
CString m_Path; `h;k2Se5
CString m_Number; lC97_T
//}}AFX_DATA !BU)K'mj
// ClassWizard generated virtual function overrides Do?P<x o
//{{AFX_VIRTUAL(CCaptureDlg) nW\(IkX\
public: ;%J5=f%z)
virtual BOOL PreTranslateMessage(MSG* pMsg); 89o)M5KQ
protected: 'NZGQebK
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %Qn(rA@9
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "a1O01n
//}}AFX_VIRTUAL Fb2%!0i
// Implementation _RMQy~&b
protected: jdevat,&u
HICON m_hIcon; j-]&'-h}#
// Generated message map functions QzGV.Mt2
//{{AFX_MSG(CCaptureDlg) JM0I(% Z%
virtual BOOL OnInitDialog(); kfC0zd+
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >KGE-Yzj
afx_msg void OnPaint(); B1N)9%
afx_msg HCURSOR OnQueryDragIcon(); ^[TV;9I*
virtual void OnCancel(); !- C' }
afx_msg void OnAbout(); b
hjZ7=
afx_msg void OnBrowse(); 8YY|;\F)J~
afx_msg void OnChange(); \d.F82
//}}AFX_MSG Al)$An-
DECLARE_MESSAGE_MAP() TOl}U
}; \zXlN
#endif x:K?\<
>L((2wfiN
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file cu#e38M&eE
#include "stdafx.h" bC@k>yC-
#include "Capture.h" vnX
#include "CaptureDlg.h" ~4.r^)\
#include <windowsx.h> gLj?Ys
#pragma comment(lib,"hook.lib") a7H0!9^h
#ifdef _DEBUG z xD,E@lF
#define new DEBUG_NEW (g/7yO(s
#undef THIS_FILE l52a\/
static char THIS_FILE[] = __FILE__; jStmS2n
#endif kD~uGA
#define IDM_SHELL WM_USER+1 Y{Ap80'\6
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [2$4| ;7
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /<)-q-W;
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; n1(?|aJ#1
class CAboutDlg : public CDialog (VHND%7P
{ ;##]G=%
public: D>ai.T%n
CAboutDlg(); g: %9jf
// Dialog Data "#^MUQ!a
//{{AFX_DATA(CAboutDlg) O]u",J5
enum { IDD = IDD_ABOUTBOX }; 7r{qJ7$%
//}}AFX_DATA kL{;.WsB
// ClassWizard generated virtual function overrides 4dhqLVgL{
//{{AFX_VIRTUAL(CAboutDlg) s(@h 2:j
protected: f%^'P"R
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )jW(6
//}}AFX_VIRTUAL kv|,b
// Implementation _ P ,@
protected: ESQ!@G/n
//{{AFX_MSG(CAboutDlg) g%J./F=@3
//}}AFX_MSG sn\;bq
DECLARE_MESSAGE_MAP() o sdOw8
}; tR`S#rk
= (U/CI
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K\=8eg93Z
{ -R+zeu(e'
//{{AFX_DATA_INIT(CAboutDlg) kM*T$JqN
//}}AFX_DATA_INIT i1*C{Lf;%)
} #0y<a:}R
c c G['7
void CAboutDlg::DoDataExchange(CDataExchange* pDX) w[fDk1H)
{ :uCdq`SaQl
CDialog::DoDataExchange(pDX); ?A=b6Um
//{{AFX_DATA_MAP(CAboutDlg) 4^Qi2[ w
//}}AFX_DATA_MAP i*tv,f.(
} 6TFo|z!C
U ^#?&u
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U~is-+Uq
//{{AFX_MSG_MAP(CAboutDlg) Y5TS>iEE]
// No message handlers swr"k6;G
//}}AFX_MSG_MAP 2bQ/0?.).-
END_MESSAGE_MAP() ")\aJ8
W}gVIfe
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) lJ/6-dP
: CDialog(CCaptureDlg::IDD, pParent) ~Yk"Hos
{ +mWjBY
//{{AFX_DATA_INIT(CCaptureDlg) }5S2p@W)
m_bControl = FALSE; Dt}dp_
m_bAlt = FALSE; F?*k}]Gi
m_bShift = FALSE; G\rj?%
m_Path = _T("c:\\"); rZC3\,W
m_Number = _T("0 picture captured."); !'c| N9
nCount=0; uCUu!Vfeg
bRegistered=FALSE; c8Pb
bTray=FALSE; |$w*RI0C
//}}AFX_DATA_INIT aPBX=;(
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JieU9lA^&B
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); gA
+:CgQ
} OD4W}Y.
jb@\i@-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {g=b]yg\o
{ edN8-P(
CDialog::DoDataExchange(pDX); z-Hkz
//{{AFX_DATA_MAP(CCaptureDlg)
U1\MA6pXW
DDX_Control(pDX, IDC_KEY, m_Key); HWtPLlNt
DDX_Check(pDX, IDC_CONTROL, m_bControl); !LSs9_w
DDX_Check(pDX, IDC_ALT, m_bAlt); ?[SVqj2-
DDX_Check(pDX, IDC_SHIFT, m_bShift); ./iXyta
DDX_Text(pDX, IDC_PATH, m_Path); 9eSRCLhgD
DDX_Text(pDX, IDC_NUMBER, m_Number); wixD\t59X
//}}AFX_DATA_MAP rgR?wXW]jE
} elKx]%k*)
g~R/3cm4
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Uz>Yn&{y6
//{{AFX_MSG_MAP(CCaptureDlg) Z[;#|$J
ON_WM_SYSCOMMAND() *PcVSEP/0
ON_WM_PAINT() O]_={%
ON_WM_QUERYDRAGICON() =YoTyq\
ON_BN_CLICKED(ID_ABOUT, OnAbout) sMJ#<w}Q
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g\J)= ,ju,
ON_BN_CLICKED(ID_CHANGE, OnChange) )+B=z}:Nfz
//}}AFX_MSG_MAP vahf]2jEB
END_MESSAGE_MAP() NKh,z&
_5-
u[[/w&UV.,
BOOL CCaptureDlg::OnInitDialog() s>J3\PC
{ ;G Qm[W([
CDialog::OnInitDialog(); Oy'0I,
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _W+Q3Jx-(
ASSERT(IDM_ABOUTBOX < 0xF000); _h~p:=
CMenu* pSysMenu = GetSystemMenu(FALSE); c%yh(g
if (pSysMenu != NULL) fv|%Ocm
{ o[{&!t
CString strAboutMenu; }~GV'7d1
strAboutMenu.LoadString(IDS_ABOUTBOX); It\BbG=
if (!strAboutMenu.IsEmpty()) -d_ 7*>m$
{ &Q+]t"OA!
pSysMenu->AppendMenu(MF_SEPARATOR); w%~qB5wF6
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Zjt9vS)
} ;qG1r@o
} V<W02\Hs
SetIcon(m_hIcon, TRUE); // Set big icon [J:zE&aj
SetIcon(m_hIcon, FALSE); // Set small icon ahoh9iJ
m_Key.SetCurSel(0); cUVTRWV
RegisterHotkey(); Zih5/I
CMenu* pMenu=GetSystemMenu(FALSE); g5<ZS3tQ
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);
u;(K34!)
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VS%@)sI|Z
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hs,5LV)|y
return TRUE; // return TRUE unless you set the focus to a control r&/D~g\"|[
} <[FS%2,0mb
a[JZ5D
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5~-}}F
{ jqqaw
if ((nID & 0xFFF0) == IDM_ABOUTBOX) {Ot[WF
{ A ')(SGSc
CAboutDlg dlgAbout; 5
2fO)!
dlgAbout.DoModal(); Nq
U9/
} 6BHPzv+Y
else A'b<?)Y7_
{ gm}C\q9
CDialog::OnSysCommand(nID, lParam); FBbm4NB
} &BTfDsxAK
} B~BUWWMfp
.yG8B:7N2
void CCaptureDlg::OnPaint() {;;eOxOP|
{ i63?"
if (IsIconic()) vnF g%M!
{ M +\rX1T
CPaintDC dc(this); // device context for painting >pa\n9=Q^
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =Y:5,.U
// Center icon in client rectangle @Z,qu2~|!
int cxIcon = GetSystemMetrics(SM_CXICON); (OQi%/Oy
int cyIcon = GetSystemMetrics(SM_CYICON); V 3%Krn1'
CRect rect; kU>#1He
GetClientRect(&rect); k\%,xf; x
int x = (rect.Width() - cxIcon + 1) / 2; &7lk2Q\
int y = (rect.Height() - cyIcon + 1) / 2; {MA@A5
// Draw the icon =cknE=
dc.DrawIcon(x, y, m_hIcon); ,&4zKm
} !__D}k,
else @gY'YA8m
{ EqYz,%I%
CDialog::OnPaint(); fg< (bXC
} +-'`Q Ae
} |zg=+
XZ!cW=bqS
HCURSOR CCaptureDlg::OnQueryDragIcon() 7- (>"75Q|
{ e|35|I '
return (HCURSOR) m_hIcon; \}n !yYh(
} {W]bU{%.
T R+Q4Y:
void CCaptureDlg::OnCancel() yr (g~MQ
{ PlF89-
if(bTray) <)=3XEcb
DeleteIcon(); |:\$n}K
CDialog::OnCancel(); tc!!W9{69
} 77 *v-8c
'"'D.,[W2
void CCaptureDlg::OnAbout() (xjqB{U
{ 6j?FRs
CAboutDlg dlg; 4;",@}
dlg.DoModal(); |qQ{ 8T%)
} q.U*X5
!4i,%Z&6
void CCaptureDlg::OnBrowse() i#Ne'q;T
{ ll 6]W~[ZC
CString str; EaJDz`T}
BROWSEINFO bi; ~r{\WZ.
char name[MAX_PATH]; $(Z]TS$M&
ZeroMemory(&bi,sizeof(BROWSEINFO)); G* 8+h
bi.hwndOwner=GetSafeHwnd(); cA2^5'$$
bi.pszDisplayName=name; s0_-1VU
bi.lpszTitle="Select folder"; ab8oMi`z
bi.ulFlags=BIF_RETURNONLYFSDIRS; m*Q[lr=
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q@ykQ
if(idl==NULL) z(c@(UD-_
return; s@.`"TF.7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); UZ[/aq
str.ReleaseBuffer(); !5yRWMO9X~
m_Path=str;
yBJ/>SAcG
if(str.GetAt(str.GetLength()-1)!='\\') +e&m#d
m_Path+="\\"; ~W]#9&yQ
UpdateData(FALSE); \ 9[NH/.Z{
} A73V6"
GMVC&^
void CCaptureDlg::SaveBmp() byEvc[/>Ys
{ c13vEn!c
CDC dc; /&S~+~]n
dc.CreateDC("DISPLAY",NULL,NULL,NULL); a!TBk=P
CBitmap bm; 8<E!rn-
int Width=GetSystemMetrics(SM_CXSCREEN); 4r68`<mn[
int Height=GetSystemMetrics(SM_CYSCREEN); m~Kch~~]
bm.CreateCompatibleBitmap(&dc,Width,Height); hr)+Pk
CDC tdc; BG(R=,
7
tdc.CreateCompatibleDC(&dc); ~.\73_M=A
CBitmap*pOld=tdc.SelectObject(&bm); <XkkYI(
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,6S_&<{
tdc.SelectObject(pOld); o|zrD~&$
BITMAP btm; xl1L4R)6D
bm.GetBitmap(&btm); l Q=&jkw
DWORD size=btm.bmWidthBytes*btm.bmHeight; (M+,wW[6
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); krEH`f
BITMAPINFOHEADER bih; L:|X/c9r[
bih.biBitCount=btm.bmBitsPixel; qcR|E`k-G
bih.biClrImportant=0; yv6Zo0s<J
bih.biClrUsed=0; mq|A8>g
bih.biCompression=0; BK`Q)[
bih.biHeight=btm.bmHeight; 0~PXa(!^K
bih.biPlanes=1; I?^Q084
bih.biSize=sizeof(BITMAPINFOHEADER); 3D 4]yR5
bih.biSizeImage=size; _WRR
3
bih.biWidth=btm.bmWidth; "z{_hp{T^
bih.biXPelsPerMeter=0; ^g}gT-l%
bih.biYPelsPerMeter=0; :,xyVb+
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^P3g9'WK
static int filecount=0; .(P@Bl]XJ
CString name; Fy4<
name.Format("pict%04d.bmp",filecount++); D[>XwL
name=m_Path+name; Ak%no3:9
BITMAPFILEHEADER bfh; b@{%qh,C
bfh.bfReserved1=bfh.bfReserved2=0; 2|T|K?R^
bfh.bfType=((WORD)('M'<< 8)|'B'); *_2O*{V
bfh.bfSize=54+size; GY0XWUlC
bfh.bfOffBits=54; {UV<=R,E
CFile bf; Li c{'w&
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <Y}"D Yt
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ti9:'I
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ZTgAZ5_cz
bf.WriteHuge(lpData,size); ;*<{*6;=?
bf.Close(); Nf/hr%jL
nCount++; CA~em_dC
} n6}E4Eno
GlobalFreePtr(lpData); l1+w2rd1
if(nCount==1) Q%X:5G?
m_Number.Format("%d picture captured.",nCount); kb>Vw<NtE
else :uU]rBMo
m_Number.Format("%d pictures captured.",nCount); [t"_}t =w
UpdateData(FALSE); VrAXOUJw6
} 0,"n-5Im
u@:=qd=\
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {LMS~nx
{ 4acP*LkkQ
if(pMsg -> message == WM_KEYDOWN) 9 "
}^SI8
{ $,z[XM&9)
if(pMsg -> wParam == VK_ESCAPE) LoV*YSDAY
return TRUE; ,\m;DR1
if(pMsg -> wParam == VK_RETURN) [+:mt</HN
return TRUE; 3;t@KuQ66
} K&\BwBU
return CDialog::PreTranslateMessage(pMsg); ^cPo{xf
} F=*BvI"+
}K#&5E
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y_Z
&p#Q!
{ P&-D0T_
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @]y{M;
SaveBmp(); )"i>R
~*
return FALSE; " OS]\-
} @y;tk$e
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @=MZ6q
CMenu pop; 6>LQGO
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Chb4VoE
CMenu*pMenu=pop.GetSubMenu(0); D@lAT#vA
pMenu->SetDefaultItem(ID_EXITICON); npG+#z
CPoint pt; ]'1N_m]?
GetCursorPos(&pt); 9>.<+b(>!'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,,C~j`F
if(id==ID_EXITICON) 0N3tsIm>
DeleteIcon(); Jq?^8y
else if(id==ID_EXIT) S7#^u`'Q_^
OnCancel(); LfjS[
return FALSE; KH@) +Rj
} l;][Q]Z@V
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "z(fBnv
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4?*"7t3
AddIcon(); 0=(-8vwd
return res; W O \lny!
} I%zo>s6
8G[Y9A(bmP
void CCaptureDlg::AddIcon() #LNB@E
{ ,mE]?XyO
NOTIFYICONDATA data; G(Idiw#WT
data.cbSize=sizeof(NOTIFYICONDATA); pRk'GR]`
CString tip; _uy5?auQ
tip.LoadString(IDS_ICONTIP); ''\cBM!
data.hIcon=GetIcon(0); 1
Q0Yer
data.hWnd=GetSafeHwnd(); CSk
strcpy(data.szTip,tip); > {LJ#Dc6
data.uCallbackMessage=IDM_SHELL; 8HH.P`Vk#
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <+i`W7
data.uID=98; g:HbmXOBpj
Shell_NotifyIcon(NIM_ADD,&data); \A ~I>x
ShowWindow(SW_HIDE); |"tV["a
bTray=TRUE; 6!}m$Dvt~
} Bc9|rl V,
xUYN\Pc-
void CCaptureDlg::DeleteIcon() +G=C~X
{ 8L9S^ '
NOTIFYICONDATA data; D^R! |K/
data.cbSize=sizeof(NOTIFYICONDATA); HNHhMi`w
data.hWnd=GetSafeHwnd(); m(7_ZiL=
data.uID=98; ~V$5 m j
Shell_NotifyIcon(NIM_DELETE,&data); H@&"M%
ShowWindow(SW_SHOW); >*Qk~kv<%
SetForegroundWindow(); a\.O L}"
ShowWindow(SW_SHOWNORMAL); 8`LLHX1|
bTray=FALSE; !f]3Riw-=,
} J\,e/{,X
hoD[wAC
void CCaptureDlg::OnChange() 5-QvQ&eH.
{ Z]> e & N
RegisterHotkey(); \8>N<B)
} )>A%FL9
0 *Yivx6
BOOL CCaptureDlg::RegisterHotkey() C6T 9
{ )*L?PT
UpdateData(); cX=b q_
UCHAR mask=0; Dil4ut-$
UCHAR key=0; HjF'~n
if(m_bControl) NYV0<z@M2M
mask|=4; GL0' :LsZ
if(m_bAlt) {D2d({7
mask|=2; $,@ rKRY
if(m_bShift) CPCB!8-5
mask|=1; ^&w'`-ra
key=Key_Table[m_Key.GetCurSel()]; ;uo|4?E:\(
if(bRegistered){ [r<
Y0|l,m
DeleteHotkey(GetSafeHwnd(),cKey,cMask); V{aIhH>P
bRegistered=FALSE; }y=n#%|i.
} >5@ 0lYhH
cMask=mask; I8pxo7(-
cKey=key; o _,$`nEJ
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); H&K)q5~
return bRegistered; s].Cx4VQ
} 93p9?4;n-
RkXLE"G'
四、小结 !\|@{UJk/
FUv)<rK
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。