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:
QrZ#<{,J5
ny={OhP- 一、实现方法
o5<<vvdA *7BfK(9T 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:
cNs'GfD} U)S=JT~h #pragma data_seg("shareddata")
t^t% >9o HHOOK hHook =NULL; //钩子句柄
+n3I\7G> UINT nHookCount =0; //挂接的程序数目
p{FI_6db static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
v9$!v^U"D static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@NHh-&;w static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
d|`Ll static int KeyCount =0;
gT+/nSrLV static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
wBPo{ #pragma data_seg()
6Rd4waj_,U %x)bZ=An 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
*Ak .KBg uOxHa>h DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
+SJ.BmT boh?Xt-$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
R[WiW RfD cKey,UCHAR cMask)
Fsx?(?tCMo {
kc,"w\ ai BOOL bAdded=FALSE;
GkIE;7#2kX for(int index=0;index<MAX_KEY;index++){
B.z$0=b if(hCallWnd[index]==0){
.
,7bGY 1$ hCallWnd[index]=hWnd;
t6+m` Kq HotKey[index]=cKey;
xad`-vw HotKeyMask[index]=cMask;
%H{p&ms bAdded=TRUE;
4s\spvJ KeyCount++;
[oWkd_dK break;
"LyD }
cHFi(K]|1 }
1Pf(.&/9_ return bAdded;
"kg`TJf= }
W,q @ww u //删除热键
V\~. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
yNu_>!Cp5 {
!Sq<_TO BOOL bRemoved=FALSE;
[P$Xr6# for(int index=0;index<MAX_KEY;index++){
Ebg8qDE
if(hCallWnd[index]==hWnd){
$KHm5*;nd if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
E-LkP; hCallWnd[index]=NULL;
JJ.8V72;!Z HotKey[index]=0;
lU
WXXuO] HotKeyMask[index]=0;
@sXFu[!U bRemoved=TRUE;
ZbnAAbfKH KeyCount--;
*MF9_V)8V break;
1/_g36\l$ }
jnH\}IB }
y@P%t9l }
@SQsEq+A?\ return bRemoved;
&$"#hGg }
p6M9uu X-pbSq~5 "CJVtO DLL中的钩子函数如下:
Z~'t'.=z }nx)|J*p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
r924!zdbR {
`FHudSK BOOL bProcessed=FALSE;
T:}Q3 if(HC_ACTION==nCode)
Y$'j9bUJ {
1HJ:
?] if((lParam&0xc0000000)==0xc0000000){// 有键松开
g?j)p y switch(wParam)
ttP7-y {
C=D* case VK_MENU:
V&mkS MaskBits&=~ALTBIT;
M!&Hn,22 break;
.qBc;u case VK_CONTROL:
uU
d"l,V MaskBits&=~CTRLBIT;
bWPsfUn# break;
hA=uoe\ case VK_SHIFT:
?d')#WnC MaskBits&=~SHIFTBIT;
E0HqXd? break;
/ViY:-8s default: //judge the key and send message
\S}/2]* 1 break;
h*w9{[L }
U%3N=M for(int index=0;index<MAX_KEY;index++){
(
eV,f if(hCallWnd[index]==NULL)
OVK
)]- ~ continue;
/VR~E'Cy% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D(b01EQ;d {
Y@,iDQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6?Ncgj
&@ bProcessed=TRUE;
qs4jUm }
jIh1)*]054 }
{3Inj8a=?A }
WfPb7T else if((lParam&0xc000ffff)==1){ //有键按下
'g#%> switch(wParam)
87
gk
{
Bdo{zv&A case VK_MENU:
^[<BMk MaskBits|=ALTBIT;
)JMqC+J3*t break;
"*vrrY case VK_CONTROL:
q,v<:sS9T MaskBits|=CTRLBIT;
YRZ\nun break;
`_/bg(E case VK_SHIFT:
N0 {e7M MaskBits|=SHIFTBIT;
DrRK Sc(u9 break;
^PG" default: //judge the key and send message
I0XJ&P% break;
~aC ?M& }
&V4Zmn?UU for(int index=0;index<MAX_KEY;index++){
Ft5A(P > if(hCallWnd[index]==NULL)
y3~=8!Tj?Q continue;
zlMh^+rMX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ny^ 1#R {
rr#nBhh8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/x3*oO1 bProcessed=TRUE;
"'4 }
o.Kn DY }
D
e&,^"% }
qu B[S)2} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
JFv70rBe for(int index=0;index<MAX_KEY;index++){
eV7;#w<] if(hCallWnd[index]==NULL)
bBIh}aDN continue;
<4rnOQ: if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"FHJ_$! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
{4_s:+v0 //lParam的意义可看MSDN中WM_KEYDOWN部分
l7`{ O/hN }
7FH(C`uKi }
@CNJpQ ujn }
u\LNJo| B return CallNextHookEx( hHook, nCode, wParam, lParam );
f' A$':Y }
BTAbDyH5 } c G)$E 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
\,S|>CPQ t/ \S9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
i1evB9FZ1z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
kf@JEcKV .xIAep_ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
qU26i"GHp [,Ehu<mEK LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
?]><#[?'L {
X}( s(6 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ixA.b#!1 {
U7WYS8 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
}
=OE.cf@ SaveBmp();
|r~ u7U\ return FALSE;
l'I:0a
4T }
b8d0]YS …… //其它处理及默认处理
C1^%!) }
s{b\\$Rb `W86]ut[ 3ijPm<wn 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。
Q6m8N $w(RJ/ 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。
!E$$FvL tV!?Ol 二、编程步骤
FKO2UY#&7 eN])qw{ 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";
W>#yXg9 WEwa<%Ss 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
6R45+<. +q&Hj|;8r 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;
I)mB]j &nIu^,. 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;
i#-v4g ~N!HxQ 5、 添加代码,编译运行程序。
`,]Bs*~ ]k!Xb 三、程序代码
811>dVq3/ 6*i** ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
UDEGQ^)Xz| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
EHUx~Q
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
DFMpU.BN W #if _MSC_VER > 1000
;M?)-dpZ #pragma once
-;9
}P #endif // _MSC_VER > 1000
>NUbk9}J4 #ifndef __AFXWIN_H__
6qT@M0)i #error include 'stdafx.h' before including this file for PCH
N,TV?Q5l7 #endif
N|DfE{, #include "resource.h" // main symbols
529b. | class CHookApp : public CWinApp
3y)\dln {
)9H5'Wh# public:
s#Dj>Fej CHookApp();
6\8d6x> // Overrides
ILm+o$o~ // ClassWizard generated virtual function overrides
tLu&3<% //{{AFX_VIRTUAL(CHookApp)
<IR#W$[ public:
c9+G
Qp virtual BOOL InitInstance();
F'XQoZ* 1 virtual int ExitInstance();
,)`_?^\$f //}}AFX_VIRTUAL
|<Ls;:5. //{{AFX_MSG(CHookApp)
AA5G`LiT // NOTE - the ClassWizard will add and remove member functions here.
?;,; // DO NOT EDIT what you see in these blocks of generated code !
d<-f:}^k0 //}}AFX_MSG
:{a< ~n` DECLARE_MESSAGE_MAP()
EL~$7 J };
| In{5Ek LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
vx9!KWy} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
g@#he95 } BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:UdW4N- BOOL InitHotkey();
+@ChZ BOOL UnInit();
^BF}wQb:j #endif
MT/jpx +JErc)% //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
gC?}1]9c #include "stdafx.h"
dBI-y6R #include "hook.h"
8C{&i5kj\E #include <windowsx.h>
jq
H)o2"/ #ifdef _DEBUG
3l=q@72 #define new DEBUG_NEW
]1++$Ej #undef THIS_FILE
kQ>2W5o-d- static char THIS_FILE[] = __FILE__;
^{"i eVn #endif
D=ej%]@iw #define MAX_KEY 100
;VLDXvGd #define CTRLBIT 0x04
D|OGlP #define ALTBIT 0x02
CmB_g?K #define SHIFTBIT 0x01
-`'|z+V #pragma data_seg("shareddata")
o"JHB HHOOK hHook =NULL;
K e4oLF2 UINT nHookCount =0;
!*v%
s static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
P|Aac,nE+^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
,g?ny<#o static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
$^Xxn.B9 static int KeyCount =0;
=b%f@x_U1 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]\yB, #pragma data_seg()
VVQ~;{L HINSTANCE hins;
JA4Zg*7I void VerifyWindow();
7(2}Vs!5 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
0se%|Z|8 //{{AFX_MSG_MAP(CHookApp)
k*A(7qQA`4 // NOTE - the ClassWizard will add and remove mapping macros here.
QjLU@?& // DO NOT EDIT what you see in these blocks of generated code!
uL)MbM] //}}AFX_MSG_MAP
E6GubU END_MESSAGE_MAP()
eP~3m $R}C(k
;? CHookApp::CHookApp()
oVw4M2!"K {
:kHk'.V1( // TODO: add construction code here,
w5z]=dN // Place all significant initialization in InitInstance
W
$D 34( }
"5eD
>! r)S:=Is5 CHookApp theApp;
Mh`^-*c? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|Kd6.Mx {
6teu_FS BOOL bProcessed=FALSE;
*{?2M6Z if(HC_ACTION==nCode)
8nI~iN?" {
q5g_5^csM{ if((lParam&0xc0000000)==0xc0000000){// Key up
<vl(a*4a switch(wParam)
o2(w {
SsX$l<t* case VK_MENU:
]/!*^;cY( MaskBits&=~ALTBIT;
8TYh&n=r break;
c+{XP&g8_J case VK_CONTROL:
%;4#?.W8 MaskBits&=~CTRLBIT;
}|h-=T ' break;
ZS:[ZehF case VK_SHIFT:
Yy
4Was# MaskBits&=~SHIFTBIT;
(NUXK break;
`T[yyOL/ default: //judge the key and send message
+PYR break;
4`~OxL }
2^s@n3t for(int index=0;index<MAX_KEY;index++){
b5g^{bzwu if(hCallWnd[index]==NULL)
vasw@Uto) continue;
HV`u#hZ7C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bY`Chb. {
H?opG<R=ek SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
aJm5`az) bProcessed=TRUE;
zX=%BL? }
P9\y~W }
PvUY
Q>Kw }
Q
m9b:U~ else if((lParam&0xc000ffff)==1){ //Key down
b<fN,U<k switch(wParam)
.f!'>_ {
;$a|4_U$m case VK_MENU:
fR.raI4et MaskBits|=ALTBIT;
/XRgsF break;
^R\5'9K! case VK_CONTROL:
8Pom^QopK MaskBits|=CTRLBIT;
FlS)m` break;
X pXhg*}K case VK_SHIFT:
$o\Uq MaskBits|=SHIFTBIT;
+$~HRbo break;
[u3^R] default: //judge the key and send message
nkk GJV! break;
x2i`$iNhmP }
<.7W:s,f= for(int index=0;index<MAX_KEY;index++)
QqY42hR {
cNN_KA if(hCallWnd[index]==NULL)
x^F2Ywp% continue;
*7Sg8\wDn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
p|Fhh\,*`X {
,/L_9wV-\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/=OSGIJzm bProcessed=TRUE;
;+qPV7Z }
Q!%CU8!`& }
E{9{%J }
\t&6$"n(B6 if(!bProcessed){
6ud<B for(int index=0;index<MAX_KEY;index++){
NOmSLIgt7 if(hCallWnd[index]==NULL)
q14A'XW continue;
[laX~(ND{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"=!QSb SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ah2XwFg? }
DPtyCgH }
p|%Y\! }
]i]sgg[ return CallNextHookEx( hHook, nCode, wParam, lParam );
' *p-` }
L{CHAVkV !c`Q?aGV) BOOL InitHotkey()
;/{Q4X{ {
~KfjT
p# if(hHook!=NULL){
LRd,7P nHookCount++;
m~NWY$oI9[ return TRUE;
ow`c B }
lB\j>.c else
E.% F/mM hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
yxQAO_C if(hHook!=NULL)
E 0pF; P5 nHookCount++;
+#H8d1^5 return (hHook!=NULL);
cwC,VYVl }
s3kEux^ BOOL UnInit()
_&![s] {
Z/RUrYeb if(nHookCount>1){
fR[!=-6^f nHookCount--;
:3n.nKANr return TRUE;
m<f{7]fi5 }
80]TKf> BOOL unhooked = UnhookWindowsHookEx(hHook);
=L
wX+c if(unhooked==TRUE){
22r01qH nHookCount=0;
=,]J"n8|v hHook=NULL;
H62*8y8 }
EhUy7b,1_ return unhooked;
tr/dd&(Y1 }
S&uL9)Glb B+DRe 8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
QF;<%QF: {
6uXYZ.A BOOL bAdded=FALSE;
5)oIPHXw for(int index=0;index<MAX_KEY;index++){
hCvn(f if(hCallWnd[index]==0){
v(7A=/W_ hCallWnd[index]=hWnd;
k"7eHSy, HotKey[index]=cKey;
dGteYt_F HotKeyMask[index]=cMask;
ZAH<!@qh bAdded=TRUE;
udZ: OU< KeyCount++;
#rr-4$w+ break;
#Fd([Zx#. }
uWInx6p }
`^_: return bAdded;
XfrnM^oty }
G!;[If:<e .>'Z9.Xnk BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Lb{D5k*XU {
Qd4T?5 vG BOOL bRemoved=FALSE;
19u?^w for(int index=0;index<MAX_KEY;index++){
;MJ1Q if(hCallWnd[index]==hWnd){
WO9/rF_ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
">9CN$]J hCallWnd[index]=NULL;
m'B6qy!}6 HotKey[index]=0;
"'#Hh&Us HotKeyMask[index]=0;
)\;r
V'; bRemoved=TRUE;
w$ { KeyCount--;
EG.C2]Fi break;
NLGr=*dq }
(B-9M) }
`7_LJ
\>I }
7$=@q|$ return bRemoved;
~m?~eJK#a }
OJ 5 !+#> $\!;*SSj void VerifyWindow()
kwR@oVR^ {
ZRm\d3x4 for(int i=0;i<MAX_KEY;i++){
Z5[:Zf?h7J if(hCallWnd
!=NULL){ !S-U8KI|
if(!IsWindow(hCallWnd)){ AyO|9!F@A
hCallWnd=NULL; N=wy)+
HotKey=0; }2,#[mM
HotKeyMask=0; |=T<WU1$
KeyCount--; J"%}t\Q
} "%t`I)
} s*~o%emw
} 30E v"
} p'k+0=
QJM!Wx+
BOOL CHookApp::InitInstance() S\;.nAR
{ 3&fFIab9
AFX_MANAGE_STATE(AfxGetStaticModuleState()); XSjelA?
hins=AfxGetInstanceHandle(); 3og$'#6P
InitHotkey(); i%4k5[f.:
return CWinApp::InitInstance(); zxUj1
} S{T d/1}
:$c:3~
int CHookApp::ExitInstance() b|o!&9Yyr
{
r;X0B
VerifyWindow(); WcO,4:
UnInit(); /.YAFH|i)"
return CWinApp::ExitInstance(); }k0-?_Z=1
} n o+tVm|
"IS^ajaq
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H&Y{jqua
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RLOQ>vYY
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ##FNq#F
#if _MSC_VER > 1000 yL
x .#kx6
#pragma once
*3`oU\r
#endif // _MSC_VER > 1000 RrdtU7i3
t`YZ)>Ws
class CCaptureDlg : public CDialog )]c3bMVE-
{ 5vX8mPR_
// Construction N^(lUba
public: #lsh N,CPm
BOOL bTray; Wo9psv7.
BOOL bRegistered; vd7N&c9
BOOL RegisterHotkey(); K}E7|gdG
UCHAR cKey; k;_KKvQ
UCHAR cMask; R 4$Q3vcH
void DeleteIcon(); t_>bTcsU
void AddIcon(); ;s\;78`0
UINT nCount; yC 7Vb
P
void SaveBmp(); ,mjfZ*N
CCaptureDlg(CWnd* pParent = NULL); // standard constructor _p J_V>l
// Dialog Data o47 f
//{{AFX_DATA(CCaptureDlg) }{wTlR.]
enum { IDD = IDD_CAPTURE_DIALOG }; ]8m_* I!
CComboBox m_Key; mDF"&.(j
BOOL m_bControl; 2@R8P~^W
BOOL m_bAlt; Ur([L&
BOOL m_bShift; wL-ydMIx
CString m_Path; of'ZNQ/
CString m_Number; xa{<R+LR
//}}AFX_DATA qH
h'l;.
// ClassWizard generated virtual function overrides }xf='lE
//{{AFX_VIRTUAL(CCaptureDlg) \%Ah^U)gS
public: D,dHP-v
virtual BOOL PreTranslateMessage(MSG* pMsg); tSb?]J
protected: <cDKGd
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B]|6`UfB
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6i]Nr@1C
//}}AFX_VIRTUAL Ac[|MBaF
// Implementation "s>fV9YyZ
protected: p<HTJ0
HICON m_hIcon; 3_L1Wm
// Generated message map functions S~k 0@
//{{AFX_MSG(CCaptureDlg) WXLe,7y
virtual BOOL OnInitDialog(); 0\cnc^Z
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \7,MZt
afx_msg void OnPaint(); \m=-8KpU
afx_msg HCURSOR OnQueryDragIcon(); % QPWw~}:
virtual void OnCancel(); !f\?c7
afx_msg void OnAbout(); 'T )Or,d
afx_msg void OnBrowse(); vXyuEEe
afx_msg void OnChange(); 7`blGzP_
//}}AFX_MSG ,pyQP^u-
DECLARE_MESSAGE_MAP() }z%OnP
}; 3tT|9Tb@
#endif 1KTabj/C
g> ~cs_N@
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _/,SZ-C#L4
#include "stdafx.h" (px*R~}
#include "Capture.h" N>d|A]zH
#include "CaptureDlg.h" ;RWW+x8IB
#include <windowsx.h> Y&vHOA
#pragma comment(lib,"hook.lib") b:P\=k]8#
#ifdef _DEBUG 5Noe/6
#define new DEBUG_NEW n}< ir!ZTO
#undef THIS_FILE VLcyPM@"Q!
static char THIS_FILE[] = __FILE__; N@Xg5huO
#endif L]k*QIn:h
#define IDM_SHELL WM_USER+1 gB]C&Q
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); owE<7TGPI?
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?. zu2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 2X|CuL{]
class CAboutDlg : public CDialog |EF>Y9
{ Y 3o^Euou
public: 94Xjz(
CAboutDlg(); DpA\r_D
// Dialog Data `FUFK/7
w\
//{{AFX_DATA(CAboutDlg) >9-Dd)<
enum { IDD = IDD_ABOUTBOX }; bt;lq!g
//}}AFX_DATA xME(B@j
// ClassWizard generated virtual function overrides / ^w"' '
//{{AFX_VIRTUAL(CAboutDlg) 0/ut:RV0
protected: "
Wp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +x(YG(5\w
//}}AFX_VIRTUAL hzaU8kb
// Implementation RNGO~:k?r
protected: Ay2b,q
//{{AFX_MSG(CAboutDlg) $zdd=.!KiK
//}}AFX_MSG t-_#Q bzE{
DECLARE_MESSAGE_MAP() sNL+F
}; /x$}D=(CZ
iwUv`>l&
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) eaEbH2J
{ $u:<x
//{{AFX_DATA_INIT(CAboutDlg) &9RH}zv6
//}}AFX_DATA_INIT 9+}cE**=d
} -(!uC+BZX
5\WUoSgy
void CAboutDlg::DoDataExchange(CDataExchange* pDX) X1Qr_o-BR
{ gt'*B5F(
CDialog::DoDataExchange(pDX); G(3;;F7"
//{{AFX_DATA_MAP(CAboutDlg) d [r-k 2
//}}AFX_DATA_MAP >E,Q
}
m;c3Z-
a~,Kz\Tt
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l_6e I
//{{AFX_MSG_MAP(CAboutDlg) -OWZ6#v(
// No message handlers QCWf.@n
//}}AFX_MSG_MAP n,CD
END_MESSAGE_MAP() $(3uOsy
^}J<)}Q
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m~;B:LN<
: CDialog(CCaptureDlg::IDD, pParent) _C20 +PMO
{ })PO7:
//{{AFX_DATA_INIT(CCaptureDlg) :<H8'4>
m_bControl = FALSE; 19p8B&
m_bAlt = FALSE; 6AAswz'$P
m_bShift = FALSE; j1A|D
m_Path = _T("c:\\"); }-74 f
m_Number = _T("0 picture captured."); ?pqU3-knH
nCount=0; GV5qdD(
bRegistered=FALSE; `Ug tvo
bTray=FALSE; ~ltg
//}}AFX_DATA_INIT [X<Pk
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ywOmQcZ
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); { D+Ym%n
} l[oe*aYN7
*GJ:+U&m[
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) gqfDacDJL
{ wx*1*KZ
CDialog::DoDataExchange(pDX); |4fF T `
//{{AFX_DATA_MAP(CCaptureDlg) _w>uI57U
DDX_Control(pDX, IDC_KEY, m_Key); hO
\/
DDX_Check(pDX, IDC_CONTROL, m_bControl); &n>7Ir
DDX_Check(pDX, IDC_ALT, m_bAlt); Wo!;K|~P
DDX_Check(pDX, IDC_SHIFT, m_bShift); [pL*@9Sa&
DDX_Text(pDX, IDC_PATH, m_Path); w#9_eq|3
DDX_Text(pDX, IDC_NUMBER, m_Number); Zj!Abji=O
//}}AFX_DATA_MAP :^#vxdIC?
} 6e.[,-eU
hF>u)%J/S
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) UV@0gdy[
//{{AFX_MSG_MAP(CCaptureDlg) `eR 7H>I
ON_WM_SYSCOMMAND() Xb,T{.3@
ON_WM_PAINT() Ac`;st%l.
ON_WM_QUERYDRAGICON() nZ
E )_
ON_BN_CLICKED(ID_ABOUT, OnAbout) -ihiG_f
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (` c
G
ON_BN_CLICKED(ID_CHANGE, OnChange) |##GIIv;i
//}}AFX_MSG_MAP ^~1<f1(
END_MESSAGE_MAP()
qybxXK:
S&wzB)#'
BOOL CCaptureDlg::OnInitDialog() g`[$XiR
{ RB$
z]/=
CDialog::OnInitDialog(); vFhz!P~
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Y3rt5\!
ASSERT(IDM_ABOUTBOX < 0xF000); jatr/
CMenu* pSysMenu = GetSystemMenu(FALSE); |`0n"x7
if (pSysMenu != NULL) suVmg-d
{ 6Hf,6>
CString strAboutMenu; >2lwWXA
strAboutMenu.LoadString(IDS_ABOUTBOX); O|'1B>X
if (!strAboutMenu.IsEmpty()) ppN} k)m
{ .zkP~xQ~
pSysMenu->AppendMenu(MF_SEPARATOR); D*2\{W/
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <]U1\~j
} `hUHel;6
} ?9xu{B>6
SetIcon(m_hIcon, TRUE); // Set big icon 3WUH~l{UJ
SetIcon(m_hIcon, FALSE); // Set small icon Apfnx7Fv
m_Key.SetCurSel(0); goZ V.,w
RegisterHotkey(); fY W|p<Q0
CMenu* pMenu=GetSystemMenu(FALSE); {x@|VuL=
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E=w3=\JP
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z^ar.boc
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Vw~\H Gs/~
return TRUE; // return TRUE unless you set the focus to a control RE"^
)-
} l,`!rF_
5v
_P
Oq
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7o]HQ[ xO
{ `JURQ:l)3^
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^%<pJMgdF
{ =RsXI&&vh
CAboutDlg dlgAbout; C+N k"l9
dlgAbout.DoModal(); l=={pb
} JL^2l$up
else vjUp *R>h
{ eJ@~o{,?>
CDialog::OnSysCommand(nID, lParam); WAPhv-6
}
jNyoN1M
} jvwwJ<K
[f{VIE*?%
void CCaptureDlg::OnPaint() l67Jl"v
{ k%81f'H
if (IsIconic()) s0"e'
{ <L0#O(L
CPaintDC dc(this); // device context for painting @N.jB#nEb
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H9 tXSh
// Center icon in client rectangle ccJM>9
int cxIcon = GetSystemMetrics(SM_CXICON); zsQoU&D 5
int cyIcon = GetSystemMetrics(SM_CYICON); E6MA?Ax&=
CRect rect; Ip
*g'
GetClientRect(&rect); Ud(`V:d
int x = (rect.Width() - cxIcon + 1) / 2; 9S7A!AKE
int y = (rect.Height() - cyIcon + 1) / 2; H)(jh
// Draw the icon n.}T1q|l
dc.DrawIcon(x, y, m_hIcon); gAbD7SE
} |oFAGP1
else !{%: qQiA
{ A[N{
CDialog::OnPaint(); 3iNkoBCg
} W;_E 4
} ,FSrn~-j9
DBH#)4do@
HCURSOR CCaptureDlg::OnQueryDragIcon() lCT{v@pp
{ Me3dpF
return (HCURSOR) m_hIcon; z8_XX$Mnt
} ^A_;#vK
C(?blv-vM0
void CCaptureDlg::OnCancel() nHXX\i
{ 8?FueAM'
if(bTray) *C|
DeleteIcon(); PL=^}{r
CDialog::OnCancel(); 6p;m\
} $.E6S<(h
Q[4:
xkU
void CCaptureDlg::OnAbout() 2 -+f1,
{ 3R$Z[D-
CAboutDlg dlg; JK_OZ
dlg.DoModal(); 4"?^UBr
} n~IVNB*
k ]a*&me
void CCaptureDlg::OnBrowse() T]9\VW4
{ J5M+FwZq
CString str; 2'0K WYM
BROWSEINFO bi; uZjC
c M
char name[MAX_PATH]; e&<yX
ZeroMemory(&bi,sizeof(BROWSEINFO)); ?=Pd
bi.hwndOwner=GetSafeHwnd(); Rd*[%)
bi.pszDisplayName=name; E+95WF|4k"
bi.lpszTitle="Select folder"; ~+F;q
vq
bi.ulFlags=BIF_RETURNONLYFSDIRS; S::=85[>z
LPITEMIDLIST idl=SHBrowseForFolder(&bi); a}yXC<}$
if(idl==NULL) ]3{0J
return; +C]&2zc.
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); B^ 7eo W
str.ReleaseBuffer(); I3b"|%
m_Path=str; jH;Du2w
if(str.GetAt(str.GetLength()-1)!='\\') K,ej%Vtz
m_Path+="\\"; gxNL_(A
UpdateData(FALSE); uzOYVN$t
} 6aft$A}XnD
3Hi+Z}8
void CCaptureDlg::SaveBmp() A;XOT6jv?
{ \*vHB`.,ey
CDC dc; x[_=#8~.1x
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4vnUN
CBitmap bm; fT\:V5-
int Width=GetSystemMetrics(SM_CXSCREEN); >TL^>D
int Height=GetSystemMetrics(SM_CYSCREEN); zt24qTKL
bm.CreateCompatibleBitmap(&dc,Width,Height); ^Mkk@F&1
CDC tdc; n
1b(\PA
tdc.CreateCompatibleDC(&dc); w0m^ &,;#
CBitmap*pOld=tdc.SelectObject(&bm); w&h2y4
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .1 )RW5|c
tdc.SelectObject(pOld); TA18 gq
BITMAP btm; SUCUP<G
bm.GetBitmap(&btm); +!t}
DWORD size=btm.bmWidthBytes*btm.bmHeight; {BBw$m, o
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7u.|XmUz
BITMAPINFOHEADER bih; K]oM8H1
bih.biBitCount=btm.bmBitsPixel; M+>`sj
bih.biClrImportant=0; %hS|68pN6
bih.biClrUsed=0; 6(&Y(/
bih.biCompression=0; >B -q@D
bih.biHeight=btm.bmHeight; rt7<Q47QE
bih.biPlanes=1; Fe&qwq"
bih.biSize=sizeof(BITMAPINFOHEADER); lU]un&[N
bih.biSizeImage=size; 9W7#u}Z
bih.biWidth=btm.bmWidth; @`"AHt
bih.biXPelsPerMeter=0; +%>:0mT
bih.biYPelsPerMeter=0; VaZn{z
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qNgd33u1
static int filecount=0; GOy%^:Xd
CString name; MhEw
_{?
name.Format("pict%04d.bmp",filecount++); qem(s</:
name=m_Path+name; yTM3^R(
BITMAPFILEHEADER bfh; E|EgB33S
bfh.bfReserved1=bfh.bfReserved2=0; H!IshZfktn
bfh.bfType=((WORD)('M'<< 8)|'B'); u0)7i.!M
bfh.bfSize=54+size; [s1pM1x
bfh.bfOffBits=54; e;YW6}'}
CFile bf; 1$lh"fHU
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;oOv/3
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :\~+#/=:
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CG]Sj*SA~
bf.WriteHuge(lpData,size); #Doq P:
bf.Close(); K ?$#ntp
nCount++; !<@J6??a}s
} ^nK7i[yF.k
GlobalFreePtr(lpData); gYop--\14]
if(nCount==1) ybdd;t}&1
m_Number.Format("%d picture captured.",nCount); xG&SX#[2
else +#J,BKul
m_Number.Format("%d pictures captured.",nCount); \$*$='6"
UpdateData(FALSE); t=euE{c
} Kr`]_m
+V862R4,o
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) q~K(]Ya/
{ @JkK99\(>9
if(pMsg -> message == WM_KEYDOWN) qF)<H
{ 7Du1RuxP
if(pMsg -> wParam == VK_ESCAPE) nxm$}!Df
return TRUE; R5_i15<
if(pMsg -> wParam == VK_RETURN) (WlIwKP
return TRUE; K!AAGj`
} 7cg*|E@
return CDialog::PreTranslateMessage(pMsg); -ZOBAG*
} d^ ZMS~\*
^}yg%+
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g|<Sfp+;+
{ cTZ.}eLh
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,38Eq`5&W
SaveBmp(); Tsb{25`+
return FALSE; 'fwU]Hm
} &sVvWNO#2
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {Z;t ^:s#
CMenu pop; F9q8SA#"
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7\
SUr9[
CMenu*pMenu=pop.GetSubMenu(0); BZK`O/
pMenu->SetDefaultItem(ID_EXITICON); :7N3N
CPoint pt; 4B+9z^oQ
GetCursorPos(&pt); _1Z=q.sC
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); lt'I,Xt
if(id==ID_EXITICON) TB6m0qX(
DeleteIcon(); >"3>s%
else if(id==ID_EXIT) #Sg\q8(O
OnCancel(); L?&'xzt B
return FALSE; ni&*E~a
} !7B\Xl'S
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )o _j]K+xI
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5-u=o)>
AddIcon(); u<ySd?
return res; eHg3}b2r
} "](6lB1Oe
7XrfuG*L$
void CCaptureDlg::AddIcon() cvsz%:Vs
{ z+2V4s =
NOTIFYICONDATA data; f,i5iSYf
data.cbSize=sizeof(NOTIFYICONDATA);
Zc&&[g
CString tip; >:sUL<p
tip.LoadString(IDS_ICONTIP); tS# `.F~y
data.hIcon=GetIcon(0); 5 +9Ze9
data.hWnd=GetSafeHwnd(); :bU(S<%M
strcpy(data.szTip,tip); Ac k}QzXO
data.uCallbackMessage=IDM_SHELL; f5RE9%.#~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u?+bW-D'd
data.uID=98; Fr?z"
Shell_NotifyIcon(NIM_ADD,&data); e59dVFug.U
ShowWindow(SW_HIDE); P3tx|:gV
bTray=TRUE; G1T^a>tj4
} TTNkr`
8
}'|]JK
void CCaptureDlg::DeleteIcon() 3.
WF}8
{ =H7xD"'%R
NOTIFYICONDATA data; `rY2up#%
data.cbSize=sizeof(NOTIFYICONDATA); )n7l'}o?+
data.hWnd=GetSafeHwnd(); )YW<" $s
data.uID=98; 79J-)e9
Shell_NotifyIcon(NIM_DELETE,&data); 1,y&d}GW
ShowWindow(SW_SHOW); FeJr\|FT
SetForegroundWindow(); vy@rQC %9
ShowWindow(SW_SHOWNORMAL); g{s'GyV8t
bTray=FALSE; FXKF\1`(H
} "HMP$)d
G*[P<<je_
void CCaptureDlg::OnChange() cRvvzX
{ 2R-A@UE2
RegisterHotkey(); $.6K!x{(
} i hL/n
05\dl
BOOL CCaptureDlg::RegisterHotkey() >gtQw!
{ >v;8~pgO
UpdateData(); :y]Omp
UCHAR mask=0; \@a$'
UCHAR key=0; Rxpn~QQ
if(m_bControl) >P KBo
mask|=4; Weoj|0|t
if(m_bAlt) VUU]Pu &
mask|=2; \79X{mcd
if(m_bShift) *2"6fX[
mask|=1; rk2xKm^w
key=Key_Table[m_Key.GetCurSel()]; }|)R
if(bRegistered){ 2 mjV~
DeleteHotkey(GetSafeHwnd(),cKey,cMask); sf}Dh
bRegistered=FALSE; k4J8O3E
} 5R$G(Ap_
cMask=mask; [ Mg8/Oy
cKey=key; 2pHR_mrb
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,n,RFa
return bRegistered; I 1d0iU
} yKagT$-
=?0lA_
0
四、小结 $L4/I !Yf
<c[U#KrvJ
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。