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:
B`e/ /
:Q DkaA 一、实现方法
bUS:c
2" Oq~{HJ{ 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:
Qw2`@P8W )).=MTk #pragma data_seg("shareddata")
)&_bY~P HHOOK hHook =NULL; //钩子句柄
SX"|~Pi( UINT nHookCount =0; //挂接的程序数目
uX_#NP/2 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
cEu_p2(7!B static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
B1_9l3RM static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
gZtQtFi static int KeyCount =0;
Ob]\t/:%P static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
I>FL&E@K #pragma data_seg()
#ae?#?/" N 62;@Z\7 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。
yZ6WbI8n n{!{,s 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:
39 }e
}W" ,;}
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
w{DU<e: cKey,UCHAR cMask)
Dst;sLr[, {
s`=| D'G(= BOOL bAdded=FALSE;
9f0`HvHC for(int index=0;index<MAX_KEY;index++){
y[$UeE"0 if(hCallWnd[index]==0){
Bbs1U hCallWnd[index]=hWnd;
0]7jb_n1 HotKey[index]=cKey;
CmBPCjh HotKeyMask[index]=cMask;
^$P_B-C N bAdded=TRUE;
:G 5p`;hGo KeyCount++;
K*j
OrQf` break;
o4p5`jOG@ }
hx0 t!k(3 }
3g!Z[SZ return bAdded;
4A@HR }
Wd7*7'] //删除热键
8J'5%$3u BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
=? !FO'zt" {
(E0WZ$f} BOOL bRemoved=FALSE;
)q_,V" for(int index=0;index<MAX_KEY;index++){
$V3If if(hCallWnd[index]==hWnd){
L?nhm=D if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
MXaik+2 hCallWnd[index]=NULL;
>bV3~m$a+ HotKey[index]=0;
?<t?G HotKeyMask[index]=0;
dYISjk@ bRemoved=TRUE;
it H KeyCount--;
(Z>?\iNJ break;
mh"PA p }
LAc60^t1 }
u_WUJ_ }
E|;>!MMA; return bRemoved;
Fxa{
9'99 }
,|RKM i}8OaX3x (.N n|lY<i DLL中的钩子函数如下:
12#yHsk O:GP uVb\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
fGV'l__\\ {
9<rs3 84 BOOL bProcessed=FALSE;
]vf_4QW= if(HC_ACTION==nCode)
OSO MFt {
m&=Dy5 if((lParam&0xc0000000)==0xc0000000){// 有键松开
Rp2h[_> switch(wParam)
GjwH C{ {
$MDmY4\ case VK_MENU:
GCYXDovh MaskBits&=~ALTBIT;
|e#W;q$v break;
^!^M Gzu case VK_CONTROL:
-sv%A7i MaskBits&=~CTRLBIT;
r
jn:E break;
Caj H;K\ case VK_SHIFT:
!4cCq_ MaskBits&=~SHIFTBIT;
Hx+r9w break;
?a,#p default: //judge the key and send message
u^SInanw break;
C1f$^N }
^"<Bk<b( for(int index=0;index<MAX_KEY;index++){
U0-RG if(hCallWnd[index]==NULL)
2<UC^vZ continue;
9 D.wW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jjH2!R]^> {
'['%b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
FUSe!f bProcessed=TRUE;
nL^7t7mp }
`%[m%Y9h }
r
ts2Jk7f }
<=|^\r
!}& else if((lParam&0xc000ffff)==1){ //有键按下
8cZ[Kl% switch(wParam)
FP&Ykx~ {
F\&wFA'J case VK_MENU:
N>EMVUVS MaskBits|=ALTBIT;
='.b/]! _ break;
0
J"g"= case VK_CONTROL:
ABoB=0.l MaskBits|=CTRLBIT;
nt_Cb*K< break;
#@YKNS[ case VK_SHIFT:
Ge=6l0 MaskBits|=SHIFTBIT;
5I[:.o0 break;
}#.OJub default: //judge the key and send message
MjQ>&fUK break;
|^Yz*r?BJ }
\'g7oV;>cI for(int index=0;index<MAX_KEY;index++){
8)iI=,T* if(hCallWnd[index]==NULL)
MA9E??p3\ continue;
m~=VUhPd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B7qi|Fw {
1Bs t| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
=@O&$& bProcessed=TRUE;
%Qj$@.*:
}
8[@Y`j8 }
,]JIp~=nsh }
J0bcW25 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
0u"j^v for(int index=0;index<MAX_KEY;index++){
)/!HI0TU if(hCallWnd[index]==NULL)
hyPS 6Y'1 continue;
(5`(H.( if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
A]QGaWK SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
D
dwFKc& //lParam的意义可看MSDN中WM_KEYDOWN部分
*>aVU' }
@ukL!AV?Y }
-h|[8UG^b }
|4BD return CallNextHookEx( hHook, nCode, wParam, lParam );
'%e@7Cs }
)Dv;,t 66B,Krz1n 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
j."V>p8u$ &N7q9t BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
j-aTpN BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$bpu >G?*rg4 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Q+a&a]*KL^ 7a_u=\, LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
TG?>;It& {
R'F \9eyA if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
?^:5` {
}|/<!l+;$ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
e
GAto SaveBmp();
\{*`-Pv return FALSE;
g|^U?|;p }
mV}8s]29 …… //其它处理及默认处理
;x_T*} CH }
=<(6yu_ `v(!IBP| Ao\ OU} 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。
2b\h@VJt ,3GB9 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。
" 5Pqvi dJQwb 二、编程步骤
"kc%d'c( 0"\js:-$ 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";
yHf^6|$8 Ug#B( }/ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
6R3/"&P(/# T{3-H(-gA 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
NP\/9
8|1 4%yeEc;z 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
iqX%pR~Yo BUI#y `J 5、 添加代码,编译运行程序。
~t*_ _Nz?fJ:$@ 三、程序代码
y9i+EV X+\=dhn69 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
`}
'o2oZnG #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
%dd B$( #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Xa'b@*o& #if _MSC_VER > 1000
&F0>V o #pragma once
=`MQKh, #endif // _MSC_VER > 1000
|gk"~D #ifndef __AFXWIN_H__
LDo~ #error include 'stdafx.h' before including this file for PCH
Ly`.~t(~l #endif
MnY}U",
#include "resource.h" // main symbols
=td(}3|D
Y class CHookApp : public CWinApp
S}/ZHo {
Y)S
f; public:
QUXr#!rPY| CHookApp();
?ODBW/{[G // Overrides
M@. 2b. // ClassWizard generated virtual function overrides
ygV-Fv>PQ //{{AFX_VIRTUAL(CHookApp)
S[/D._5QD% public:
>"]t4]GVf virtual BOOL InitInstance();
<c(%xh46 virtual int ExitInstance();
1X&scVw //}}AFX_VIRTUAL
maQDD* //{{AFX_MSG(CHookApp)
rc{F17~vX // NOTE - the ClassWizard will add and remove member functions here.
]K5j(1EN // DO NOT EDIT what you see in these blocks of generated code !
68qCY //}}AFX_MSG
,0,&
L DECLARE_MESSAGE_MAP()
f0{tBD!% };
up?S (.*B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
d$MewDWUN BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
~^~+p BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
,I f9w$(z BOOL InitHotkey();
.,p@ee$q BOOL UnInit();
'A/{7*, #endif
Co<F<eXe {4R;C~E8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
tD,~i"0; #include "stdafx.h"
51s 3hX$ #include "hook.h"
UPuG&A#VV #include <windowsx.h>
y.Yni*xt/ #ifdef _DEBUG
6se[>'5 #define new DEBUG_NEW
G>2: WQ/ #undef THIS_FILE
~05(92bK static char THIS_FILE[] = __FILE__;
8\`otJY #endif
8;,(D#p #define MAX_KEY 100
`C*psS #define CTRLBIT 0x04
ARB^] #define ALTBIT 0x02
hya
$Vp #define SHIFTBIT 0x01
N?%FVF #pragma data_seg("shareddata")
]<o^Q[OL HHOOK hHook =NULL;
d+7Dy3i|g= UINT nHookCount =0;
PrEfJ? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
sGbk4g static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
_7-P8"m static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
H#I%6k*\a static int KeyCount =0;
`hl1R3nBM static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Wl>$<D4mO[ #pragma data_seg()
9>L{K
HINSTANCE hins;
KSl@V>!_ void VerifyWindow();
\v.YP19 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
.t%`"C //{{AFX_MSG_MAP(CHookApp)
^ G>/;mZ // NOTE - the ClassWizard will add and remove mapping macros here.
=/^{Pn // DO NOT EDIT what you see in these blocks of generated code!
FPuF1@K //}}AFX_MSG_MAP
j2!^iGS} END_MESSAGE_MAP()
z]Mu8 6Y=MW{=F CHookApp::CHookApp()
`SESj)W(y {
6:Zd,N= // TODO: add construction code here,
l$!g#?w // Place all significant initialization in InitInstance
oIY@xuj }
ca!x{,Cvnj naW!Mga CHookApp theApp;
TSYe~)I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a)M#O\i` {
OD1>s6uA7 BOOL bProcessed=FALSE;
vqBT^Q_q; if(HC_ACTION==nCode)
bQ_N^[oxQ {
'sAs# if((lParam&0xc0000000)==0xc0000000){// Key up
!pe!Z-, switch(wParam)
^sZ,(sc{G {
3l''
case VK_MENU:
T#G
(&0J5 MaskBits&=~ALTBIT;
IWAp break;
VTJ,;p_UH case VK_CONTROL:
%y2i1^ MaskBits&=~CTRLBIT;
{
BDUl3T break;
92Df.xI} case VK_SHIFT:
Z<Ke/Xi MaskBits&=~SHIFTBIT;
8G
p%Q break;
dI9u:- default: //judge the key and send message
dpcFS0 break;
S"joXmJ/-C }
7S]akcT/ for(int index=0;index<MAX_KEY;index++){
ejPK-jxCa/ if(hCallWnd[index]==NULL)
)3KQ
QGi8 continue;
oSqkAAGz\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}Dc?Emb {
[H2"z\\u SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9"mcN3x:\e bProcessed=TRUE;
sAU!u }
_0]{kB.$_ }
hiA%Tq? }
h;8^vB y else if((lParam&0xc000ffff)==1){ //Key down
N| L Ey switch(wParam)
VWR6/,N^_ {
)\r;|DN case VK_MENU:
~Uw<E:?v MaskBits|=ALTBIT;
00)=3@D break;
V:8ph`1 case VK_CONTROL:
Ed%8| M3 MaskBits|=CTRLBIT;
"]dNN{Wka break;
eJB !| case VK_SHIFT:
[4qx+ypT MaskBits|=SHIFTBIT;
}?pY~f break;
sz' IGy% default: //judge the key and send message
/\S1p3EW* break;
4&Uq\,nx }
AiT&:'<UT for(int index=0;index<MAX_KEY;index++)
(1r.AG`g {
Khbkv if(hCallWnd[index]==NULL)
ab 1qcQ< continue;
EPQ~V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
l;I)$=={= {
\#.@*?fk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
I$o^F/RH bProcessed=TRUE;
*;~*S4/P }
5Mfs)a4j. }
cC_L4 }
QPf#y7_@u if(!bProcessed){
W?a2P6mAh for(int index=0;index<MAX_KEY;index++){
rRN7HL+b if(hCallWnd[index]==NULL)
p:9)}y continue;
KB$s7S"= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
GT[,[l SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
u;xl} }
xhAORhw# }
\4RVJ[2 }
qV%t[> return CallNextHookEx( hHook, nCode, wParam, lParam );
kMGK8y }
&95iGL28Q s}]qlg BOOL InitHotkey()
>9o(84AxIH {
/qW5M4.w if(hHook!=NULL){
17Q1Xa nHookCount++;
18|i{fE; return TRUE;
;* vVucx }
zDbjWd else
F)we^'X hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
6t0!a@t if(hHook!=NULL)
etX&o5A nHookCount++;
Yq;|Me{h return (hHook!=NULL);
E\V-<]o }
47R4gs#W BOOL UnInit()
OC|9~B1 {
/YbyMj* if(nHookCount>1){
oaI|A^v nHookCount--;
aI$D
qnF4 return TRUE;
lF]cUp#< }
U2*g9Es BOOL unhooked = UnhookWindowsHookEx(hHook);
?*}^xXI/ if(unhooked==TRUE){
LFsrqdzJ nHookCount=0;
U!E
hHook=NULL;
(vCMff/ Y1 }
B/S~Jn return unhooked;
\bze-|C }
r7z8ICX'q ,~
D_T BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,?"cKdiZ {
pKf]&?FX BOOL bAdded=FALSE;
|kwBb>V for(int index=0;index<MAX_KEY;index++){
5c btMNP if(hCallWnd[index]==0){
6&pI{ hCallWnd[index]=hWnd;
V6.xp{[ HotKey[index]=cKey;
3:Aw.-,i\ HotKeyMask[index]=cMask;
pA(B~9 WQ bAdded=TRUE;
~429sT( KeyCount++;
<#U9ih
2 break;
sh []OSM }
`C~RA,M }
~{,U%B return bAdded;
|wASeZMO2 }
MB9tnGO-Q \atztC{-L> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BlF]-dF\ {
W\s
]qsLS BOOL bRemoved=FALSE;
j';V(ZY&BB for(int index=0;index<MAX_KEY;index++){
6#S}EaWf if(hCallWnd[index]==hWnd){
i5 x[1 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
bI)ItC_wf! hCallWnd[index]=NULL;
LRO'o{4$E HotKey[index]=0;
Y6T1_XG HotKeyMask[index]=0;
fk%yi[ bRemoved=TRUE;
mX78Av.z! KeyCount--;
N=J$+ break;
xjHOrr
OQ }
~7$E\w6 }
SST1vzm! }
*Mf; return bRemoved;
oVPtA@ }
<eU28M?\ FNpMu3Q void VerifyWindow()
+@]b}W {
,f`435R for(int i=0;i<MAX_KEY;i++){
k r0PL)$ if(hCallWnd
!=NULL){ #hEN4c[Ex
if(!IsWindow(hCallWnd)){ W+
tI(JZ
hCallWnd=NULL; vkdU6CZO
HotKey=0; ze!S4&B
HotKeyMask=0; >[ r
TUn;
KeyCount--; Qp{gV Ys
} __p\`3(,'
} E DuLgg@
} Qe=,EXf
} s#,~Zb=
OR[6pr@
BOOL CHookApp::InitInstance() \Q+9sV
5,[
{ uT8@p8
AFX_MANAGE_STATE(AfxGetStaticModuleState()); t^HQ=*c
hins=AfxGetInstanceHandle(); lv_|ws
InitHotkey(); K!/"&RjW.
return CWinApp::InitInstance(); Z:3N*YkL
} oQgd]|v
y5_`<lFv
int CHookApp::ExitInstance() x`@!hJc:[e
{ Lpw9hj|
VerifyWindow(); D}|PBR
UnInit(); bWzv7#dd=
return CWinApp::ExitInstance(); G}aw{Vbg_
} # Ny
WVc3C-h,
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file v?zA86d_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xaO9?{O
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ TJ@@kSSbl
#if _MSC_VER > 1000 3F' {JP
#pragma once rzJNHf=FVY
#endif // _MSC_VER > 1000 =5NrkCk#V
5'f4=J$Z)
class CCaptureDlg : public CDialog Z$R6'EUb1
{ 9-;ujl?{
// Construction R<VNbm;
public: -.A%c(|Q
BOOL bTray; P(I`^x
BOOL bRegistered; 'P{0K?{H-4
BOOL RegisterHotkey(); Fw!wSzsk3
UCHAR cKey; Qmxe*@{`
UCHAR cMask; \|2 0E51B[
void DeleteIcon(); `oP<mLxle
void AddIcon(); ^|^ek
UINT nCount; :34#z.O
void SaveBmp(); NvH9?Ek"
CCaptureDlg(CWnd* pParent = NULL); // standard constructor (4_7ICFI
// Dialog Data )3<|<jwcx
//{{AFX_DATA(CCaptureDlg) EL!V\J`S_
enum { IDD = IDD_CAPTURE_DIALOG }; DA)+)PhY7K
CComboBox m_Key; Q3MG+@) S
BOOL m_bControl; 1PWs">*(
BOOL m_bAlt; Bw-<xwD
BOOL m_bShift; T'9I&h%\
CString m_Path; ":E^&yQ
CString m_Number; m+p}Qi8i)
//}}AFX_DATA \u@4eBAV
// ClassWizard generated virtual function overrides [(v?Z`cX\
//{{AFX_VIRTUAL(CCaptureDlg) %2Q:+6)
public: =;DmD?nZ
virtual BOOL PreTranslateMessage(MSG* pMsg); Le3H!9lbc
protected: ,i>u>YNZ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }:u" ?v=|j
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L3:dANG
//}}AFX_VIRTUAL b_=$W
// Implementation Xd%c00"U
protected: !mNXPqnN
HICON m_hIcon; m&/{iCwp
// Generated message map functions VU+` yQp
//{{AFX_MSG(CCaptureDlg) IXb]\ )
virtual BOOL OnInitDialog(); } ).rD
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mG4myQ?$
afx_msg void OnPaint(); XMb]&VvH
afx_msg HCURSOR OnQueryDragIcon(); :uhU<H<,f
virtual void OnCancel(); [.\uHt
afx_msg void OnAbout(); Df;EemCh
afx_msg void OnBrowse(); >|%dN
jf@Q
afx_msg void OnChange(); <p"[jC2zF;
//}}AFX_MSG /]H6'
DECLARE_MESSAGE_MAP() "]M:+mH{]
}; _2Sb?]Xn
#endif 3xS+Pu\)
tins.D
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W- Q:G=S-
#include "stdafx.h" #m_3ls}W$
#include "Capture.h" _t<D~
#include "CaptureDlg.h" N
]/N}b
#include <windowsx.h> q$)$?"
#pragma comment(lib,"hook.lib") +We_[Re`<
#ifdef _DEBUG >]N}3J}47g
#define new DEBUG_NEW i0`<`qSQh
#undef THIS_FILE *0>![v
static char THIS_FILE[] = __FILE__; ^Rr0)4ns
#endif j8p</gd
#define IDM_SHELL WM_USER+1 eELJDSd
BV
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OO?d[7Wt0
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =O= 0 D
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :s8^nEK
class CAboutDlg : public CDialog K)z{R n
{ 6"@+Jz
public: 0* Ox>O>
CAboutDlg(); .!uXhF'
// Dialog Data *_G(*yAe(
//{{AFX_DATA(CAboutDlg) O;RsYs9
enum { IDD = IDD_ABOUTBOX }; +X[+SF)!
//}}AFX_DATA o&]b\dV
// ClassWizard generated virtual function overrides t']d_Vcza
//{{AFX_VIRTUAL(CAboutDlg) t)|*-=
protected: wQR>S>p
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l ;"v&?
//}}AFX_VIRTUAL @<]sW*s
// Implementation 3IXai)6U
protected: k
I{)"
//{{AFX_MSG(CAboutDlg) l,cnMr^.W
//}}AFX_MSG \Eq,4-q
DECLARE_MESSAGE_MAP() up+W[#+
}; v+a$Xh3Y~
u{#}Lo>B #
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) e>yPFXSk
{ Y~ j.Kt
//{{AFX_DATA_INIT(CAboutDlg) 7!%/vO0m
//}}AFX_DATA_INIT E'3=qTbiD
} Dep.Qfv{-
tHF-OarUO
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~>C@n'\lv
{ hY$gzls4
CDialog::DoDataExchange(pDX); L?~>eT
//{{AFX_DATA_MAP(CAboutDlg) 12
y=Eh
//}}AFX_DATA_MAP 8K: RoR
} bI~ R6o
WZz8VF
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^PwZP;On
//{{AFX_MSG_MAP(CAboutDlg) #_]/Mr1
// No message handlers '@4Myg* b
//}}AFX_MSG_MAP Hh^EMQk
END_MESSAGE_MAP() l=EnK"aU
K%NNw7\A
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ZL!,s#
: CDialog(CCaptureDlg::IDD, pParent) Ze `=n
{ bf1Tky=/
//{{AFX_DATA_INIT(CCaptureDlg) 5u/d r9n
m_bControl = FALSE; R]{zGFnx
m_bAlt = FALSE; \o-9~C\c*
m_bShift = FALSE; r\#_b4-v3h
m_Path = _T("c:\\"); ZJL8"(/R
m_Number = _T("0 picture captured."); _v~c3y).
nCount=0; BE,XiH;
bRegistered=FALSE; ?`9XFE~a!
bTray=FALSE; Y"Y%JJ.J
//}}AFX_DATA_INIT W 7xh
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zNAID-5K;
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'i-6JG%
} )OjTn"
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N=Q<mj;,
{ 9f UD68Nob
CDialog::DoDataExchange(pDX); b02V#m;Z
//{{AFX_DATA_MAP(CCaptureDlg) UB%Zq1D|t
DDX_Control(pDX, IDC_KEY, m_Key); }XmrfegF
DDX_Check(pDX, IDC_CONTROL, m_bControl); ;/ wl.'GA
DDX_Check(pDX, IDC_ALT, m_bAlt); X<:B"rPuK
DDX_Check(pDX, IDC_SHIFT, m_bShift); N, `q1B
DDX_Text(pDX, IDC_PATH, m_Path); @zu IR0Gr)
DDX_Text(pDX, IDC_NUMBER, m_Number); 54[#&T$S
//}}AFX_DATA_MAP z1dSZ0NoA
} e}@VR<h
pe}mA}9U
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) YUGE>"{
//{{AFX_MSG_MAP(CCaptureDlg) F4M )x`
ON_WM_SYSCOMMAND() zN3[W`q+m
ON_WM_PAINT() e"=/zZH3
ON_WM_QUERYDRAGICON() b/#SkxW#S
ON_BN_CLICKED(ID_ABOUT, OnAbout) o%EzK;Df
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q{+*F8%8V<
ON_BN_CLICKED(ID_CHANGE, OnChange) 2@TgeV0Y[
//}}AFX_MSG_MAP #}M\ J0QG
END_MESSAGE_MAP() IP?15l w
kSW=DE|#}
BOOL CCaptureDlg::OnInitDialog() L{pz)')I
{ x*`S>_j27=
CDialog::OnInitDialog(); }~I(e
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %@L[=\
9
ASSERT(IDM_ABOUTBOX < 0xF000); I{bDa'rX
CMenu* pSysMenu = GetSystemMenu(FALSE); }-Ds%L
if (pSysMenu != NULL) `efC4#*!!
{ "Wz8f
CString strAboutMenu; n>t&l8g%g
strAboutMenu.LoadString(IDS_ABOUTBOX); ni2GZ<1j
if (!strAboutMenu.IsEmpty()) q fc:%ks2
{ ye<b`bL2.
pSysMenu->AppendMenu(MF_SEPARATOR); GtuA94=!V&
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `!Z0;qk
} Fb2,2Px
} x3>ZO.Q
SetIcon(m_hIcon, TRUE); // Set big icon wDQ@$T^vh
SetIcon(m_hIcon, FALSE); // Set small icon #}PQ !gZ
m_Key.SetCurSel(0); lF[m*}l
RegisterHotkey(); k kZ2Jxvx
CMenu* pMenu=GetSystemMenu(FALSE); ='W=
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); y ;/T.W9!
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .2Q4EbM2
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); W)X" G3
return TRUE; // return TRUE unless you set the focus to a control #!0=I
s^
} N>TmaUk
YYE{zU
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o*k.je1
{ jo-2D[Q{
if ((nID & 0xFFF0) == IDM_ABOUTBOX) V),wDyi
{ =l)D$l
CAboutDlg dlgAbout; *&vlfH
dlgAbout.DoModal(); 1 5heLnei
} ._E 6?
else =,BDd$e
{ {})d}dEC
CDialog::OnSysCommand(nID, lParam); ]Cc3}+(s
} ]8n*f o2#
} G?M<B~}
12i<b
void CCaptureDlg::OnPaint() %nS(>X<B
{ eS`ZC!W
if (IsIconic()) 3u 'VPF2
{ 7"_m?c8
CPaintDC dc(this); // device context for painting zb]e{$q2C
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QkFB\v
// Center icon in client rectangle aZ,j1j0p
int cxIcon = GetSystemMetrics(SM_CXICON); -lY,lC>{
int cyIcon = GetSystemMetrics(SM_CYICON); m
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CRect rect; A_!N,<-
GetClientRect(&rect); H9\,;kM)
int x = (rect.Width() - cxIcon + 1) / 2; "u.'JE;j
int y = (rect.Height() - cyIcon + 1) / 2; D_N0j{E
// Draw the icon }>5R9
dc.DrawIcon(x, y, m_hIcon); HUFm@?
} =Lh8#>T\h
else {e+}jZ[L
{ e**<et.
CDialog::OnPaint(); *g*~+B
:
} \y(ZeNs
} Z<jC,r
%A3ci[$g
HCURSOR CCaptureDlg::OnQueryDragIcon() 2/iBk'd
{ B:>>D/O
return (HCURSOR) m_hIcon; ?NVX# t'
} [;C|WTYSL
Zv0'OX~8i
void CCaptureDlg::OnCancel() {'-^CoR
{ %{|67h
if(bTray) w61*jnvi@
DeleteIcon(); WK.K-bd
CDialog::OnCancel(); */APe#
} p)qM{`]G\
1`sTGNo
void CCaptureDlg::OnAbout() 0iAQ;<*xi
{ 4Uk\h gT0
CAboutDlg dlg; #AR$'TE#
dlg.DoModal(); XxY wBc'pc
} hAV@/oQ
dw-o71(1d
void CCaptureDlg::OnBrowse() nb\pBl
{ H
-K%F_#
CString str; [ KDNKK
BROWSEINFO bi; Z?<&@YQS
char name[MAX_PATH]; uhm3}mWv
ZeroMemory(&bi,sizeof(BROWSEINFO)); h:AB`E1
bi.hwndOwner=GetSafeHwnd(); 3s0I<cL
bi.pszDisplayName=name; |})v,
oB
bi.lpszTitle="Select folder"; nK)hv95i_
bi.ulFlags=BIF_RETURNONLYFSDIRS; JA$RY
LPITEMIDLIST idl=SHBrowseForFolder(&bi); S-[S?&c`
if(idl==NULL) lt("yqBu
return; ATWa/"l(H-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nh]HEG0CZJ
str.ReleaseBuffer(); eMLcmZJR
m_Path=str; &X6hOc:``\
if(str.GetAt(str.GetLength()-1)!='\\') a0jzt!ci
m_Path+="\\"; ydTd.`
UpdateData(FALSE); Sc?q}tt^C
} aF{1V\e
=`k',V_
void CCaptureDlg::SaveBmp() =p[a Cb
i
{ ".{'h
CDC dc; oO^=%Mc(
dc.CreateDC("DISPLAY",NULL,NULL,NULL); yf2P6b\
CBitmap bm; tH(g;flO)
int Width=GetSystemMetrics(SM_CXSCREEN); cl'wQ1<:
int Height=GetSystemMetrics(SM_CYSCREEN); 'si{6t|
bm.CreateCompatibleBitmap(&dc,Width,Height); ,B:r^(}0j
CDC tdc; 2BO&OX|X
tdc.CreateCompatibleDC(&dc); b(Yxsy{U
CBitmap*pOld=tdc.SelectObject(&bm); S"/-)_{
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Os/?iGlD*E
tdc.SelectObject(pOld); n}dLfg*
BITMAP btm; $T6+6<
bm.GetBitmap(&btm); )SHB1U25{
DWORD size=btm.bmWidthBytes*btm.bmHeight; IAJ+n0U
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \b}%A&Ij
BITMAPINFOHEADER bih; fizL_`uMqb
bih.biBitCount=btm.bmBitsPixel; d[YG&.}+8j
bih.biClrImportant=0; "vfpG7CG
bih.biClrUsed=0; LMNmG]#!
bih.biCompression=0; 2v<O}
bih.biHeight=btm.bmHeight; TSH'OW !b
bih.biPlanes=1; O Cnra
bih.biSize=sizeof(BITMAPINFOHEADER); /bF>cpM
bih.biSizeImage=size; A*{CT>
bih.biWidth=btm.bmWidth; -6xh
bih.biXPelsPerMeter=0;
8 q>
bih.biYPelsPerMeter=0; m7u" awM^
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yUN>mD-
static int filecount=0; *#1J
CString name; nE56A#,Q,
name.Format("pict%04d.bmp",filecount++); AYAbq}'Yt
name=m_Path+name; "H]R\xp
BITMAPFILEHEADER bfh; mRy0zN>?
bfh.bfReserved1=bfh.bfReserved2=0; ,hWuAu6.L
bfh.bfType=((WORD)('M'<< 8)|'B'); rYM@e
bfh.bfSize=54+size; dwouw*8
bfh.bfOffBits=54; VHG}'r9KC%
CFile bf; A@eR~Kp
^
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 30O7u3Zrb
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *6G@8TIh
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "|BSGV!8
bf.WriteHuge(lpData,size); Hb[P|pPT
bf.Close(); T_d)1m fl
nCount++; }/4),W@<
} d(K}v\3!
GlobalFreePtr(lpData); Z^J7r&\V
if(nCount==1) \zeu vD
m_Number.Format("%d picture captured.",nCount); BZ(DP_}&D
else "y60YYn-#J
m_Number.Format("%d pictures captured.",nCount); F<^f6z8
UpdateData(FALSE); QZ+G2$
} /I:&P Pff
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) RN$>!b/
{ 6m@B.+1
if(pMsg -> message == WM_KEYDOWN) Ed+jSO0
{ lx7]rkWo|a
if(pMsg -> wParam == VK_ESCAPE) e|q~t
{=9S
return TRUE; ornU8H`
if(pMsg -> wParam == VK_RETURN) (mioKO )?v
return TRUE; $EL:Jx2<
} !;Ke# E_d
return CDialog::PreTranslateMessage(pMsg); Yy;BJ_
} ZSr!L@S
T:" .{h-i
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 211V'|a_>
{ -`NzBuV$2,
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,YJn=9pTl
SaveBmp(); xW7[ VTXc^
return FALSE; [c
XSk
} j<k-w
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [
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CMenu pop; y#= j{
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); FV{XPr%
CMenu*pMenu=pop.GetSubMenu(0); "ji+~%`^[t
pMenu->SetDefaultItem(ID_EXITICON); *m2?fP\
CPoint pt; 3"sXN)j
GetCursorPos(&pt); FF;Fo}no-
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); '<>?gE0Cd
if(id==ID_EXITICON) ;/H/Gn+
DeleteIcon(); rs,'vV-2\
else if(id==ID_EXIT) hZw8*H^tP
OnCancel(); }Syd*%BR[
return FALSE; IZGRQmi"
} //RD$e?h~
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t*)!BZ
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y.-Kqa~
AddIcon(); c|K:oi,z
return res; 2%*\XPt)
} 2XEE/]^
li{!Jp5]1b
void CCaptureDlg::AddIcon() C{+JrHV%h
{ TF 80WMt
NOTIFYICONDATA data; YI`BA`BQ8
data.cbSize=sizeof(NOTIFYICONDATA); BO8?{~i
CString tip; 4$81ilBcL
tip.LoadString(IDS_ICONTIP); QKhGEW~G
data.hIcon=GetIcon(0); /,~g"y.;,
data.hWnd=GetSafeHwnd(); h
lSav?V_
strcpy(data.szTip,tip); @(0O9L
F
data.uCallbackMessage=IDM_SHELL; 4dm0:,
G
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~,Yd.?.TI
data.uID=98; IfT: 9
&
Shell_NotifyIcon(NIM_ADD,&data); /x4L,UJ= P
ShowWindow(SW_HIDE); p 16+(m
bTray=TRUE; +DO<M1uE
} \#IKirf?
3`)ej`
void CCaptureDlg::DeleteIcon() G&t|aY-
{ 7#SfuZ0@
NOTIFYICONDATA data; x&"P^gh)
data.cbSize=sizeof(NOTIFYICONDATA); p/G9P +?
data.hWnd=GetSafeHwnd(); 5m;BL+>YE
data.uID=98; jfVw{\l
Shell_NotifyIcon(NIM_DELETE,&data); sk*vmxClY
ShowWindow(SW_SHOW); i|xz
SetForegroundWindow(); .&`apQD}
ShowWindow(SW_SHOWNORMAL); QjD=JC+
bTray=FALSE; 1f'msy/
} 6 !N2B[9
A8o)^T(vJ
void CCaptureDlg::OnChange() i g
.
{ Ps<k 2
RegisterHotkey(); 5X9L h_p
} Pa?{}A
fsWIz1K
BOOL CCaptureDlg::RegisterHotkey() nrX+ '
{ i r'C(zD=
UpdateData(); \(&&ed:
UCHAR mask=0; cmAdQ)(Kzd
UCHAR key=0; m&z(2yb1
if(m_bControl) '=eVem=
mask|=4; fJ6Q:7
if(m_bAlt) $*LBZcL
mask|=2; sZ7~AJ
if(m_bShift) j)#yyK{k2s
mask|=1; l|iOdKr h
key=Key_Table[m_Key.GetCurSel()]; }`!-WY
if(bRegistered){ ruyQ}b:zS
DeleteHotkey(GetSafeHwnd(),cKey,cMask); mNEh\4ai
bRegistered=FALSE; O%6D2d
} W$`#X
cMask=mask; U0iV
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cKey=key; jw
5 U-zi
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); HLdHyK/S
return bRegistered; nJ/}b/A{
} FMhuCl2
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四、小结 ,}"jiGgS4
@ &Od1X
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。