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:
Exu>%
>J,y1jzJ 一、实现方法
\I[50eh| .QVZ! 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:
N_^s;Qj n)xLEx, #pragma data_seg("shareddata")
xG"*w@fs7 HHOOK hHook =NULL; //钩子句柄
eGr;P aG UINT nHookCount =0; //挂接的程序数目
x-%4-) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
TOC2[mc' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
~&\} qz3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
/CfgxPo static int KeyCount =0;
&w"1VOV< static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
VsR8|Hn$ #pragma data_seg()
L^><APlX DJ.n8hne 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。
4t e QG bWEti}kW 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:
;I@@PUnR RP|/rd]-k BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
\#O}K cKey,UCHAR cMask)
guc[du {
[:*Jn} BOOL bAdded=FALSE;
8AgKK=C= for(int index=0;index<MAX_KEY;index++){
kD.KZV if(hCallWnd[index]==0){
jSc!"Trl] hCallWnd[index]=hWnd;
A$Tp0v`t HotKey[index]=cKey;
Z36C7 kw HotKeyMask[index]=cMask;
(eEs0 bAdded=TRUE;
T\3aT KeyCount++;
Tc.k0n%W:b break;
BK;Gh0mp }
{.mPe| }
Oll,;{<O return bAdded;
TP R$oO2 }
f:hsE //删除热键
wR]jJbF BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!]*Cwbh.
u {
?=#vp / BOOL bRemoved=FALSE;
o +KDK{MD for(int index=0;index<MAX_KEY;index++){
yMVlTO if(hCallWnd[index]==hWnd){
#|R#/Yc@Bv if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kACgP!~/1 hCallWnd[index]=NULL;
sjIUW$ HotKey[index]=0;
YggeKN HotKeyMask[index]=0;
&'KJh+jJ
bRemoved=TRUE;
4M,Q{G|e KeyCount--;
(u:^4,Z break;
'ugc=-0pd }
0tb%h[%,M }
+0Z,#b }
|f IIfYE return bRemoved;
t]14bf$*Q }
IF~E; /;{E}` sDXD>upO DLL中的钩子函数如下:
Svqj@@_f 9Q/t+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qr<RMs {
::`#qa4! BOOL bProcessed=FALSE;
$L kTu if(HC_ACTION==nCode)
K*id
1YY {
|^k&6QO5 if((lParam&0xc0000000)==0xc0000000){// 有键松开
(2uF<$7( switch(wParam)
"kS!rJ[ {
]:_s7v case VK_MENU:
8Z[YcLy"({ MaskBits&=~ALTBIT;
~H4wsa39 break;
o!@}&DE|*L case VK_CONTROL:
h'm-]v MaskBits&=~CTRLBIT;
{i#z<ttu break;
Wb{0UkApJ case VK_SHIFT:
)Bw}T MaskBits&=~SHIFTBIT;
rZ#ZY break;
HzQY\Y6 default: //judge the key and send message
50jZu'z: break;
)Gm,%[?2C }
CR8szMa for(int index=0;index<MAX_KEY;index++){
eEl71 if(hCallWnd[index]==NULL)
BL[N continue;
'^!#*O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9,c_(%C {
+{h.nqdAE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
fPBJ%SZ bProcessed=TRUE;
Uu_Es{@ }
@
Cd#\D| }
-~] q?k? }
A~)# else if((lParam&0xc000ffff)==1){ //有键按下
AC&)FY switch(wParam)
%iR"eEE {
fK{m7?V case VK_MENU:
Em ;2fh MaskBits|=ALTBIT;
$+ break;
i9koh3R\ case VK_CONTROL:
C116c" MaskBits|=CTRLBIT;
j@u]( nf break;
vN9R.R case VK_SHIFT:
%5$)w;p.$' MaskBits|=SHIFTBIT;
mJNw<T4!/ break;
E^4}l2m_ default: //judge the key and send message
;_p$5GVR| break;
w&[&ZDsK }
;V0^uB.z for(int index=0;index<MAX_KEY;index++){
W"n0x8~sV if(hCallWnd[index]==NULL)
K
7OIT2- continue;
?>/9ae^Bw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7SJR_G6,{ {
Z_;!f}X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
L6x;<gj bProcessed=TRUE;
)lZoXt_3 }
Rn$[P.|| }
rt0_[i }
l=PZlH
y1G if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
wQ9?Z.-$ for(int index=0;index<MAX_KEY;index++){
nq5qUErew if(hCallWnd[index]==NULL)
`nrw[M? continue;
,n3e8qd if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
*$Z,kZ^^ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
z_8lf_N //lParam的意义可看MSDN中WM_KEYDOWN部分
["^? vhv }
LU $=j }
b.j$Gna>Q }
alH6~ return CallNextHookEx( hHook, nCode, wParam, lParam );
8I[=iU7]l }
Ef$a&*)PH \IaUsx"#o{ 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:
ZM16 ~k $1 t
IC_ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Vbv)C3ezD BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
!nU|3S[b
ub;:"ns} 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
NHiac(&* H1.ktG LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
+"1fr
{
.XT]\'vW if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
\q@Co42n\ {
gA}?X //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
zfw=U
\ SaveBmp();
3Fw7q" return FALSE;
:cvT/xhO }
ON9L+"vqv0 …… //其它处理及默认处理
!oa/\p }
Rt>mAU$} 5=#2@qp $5:I~-mx 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
FsLd&$?T& 4sq](!A 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。
Ihp
Ea,v) #&X5Di[A 二、编程步骤
iNr&; ,N1pw w? 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";
E7q,6f3@r N[A9J7}_R 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,bzC|AK {)(Mkm+d 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;
Re+oCJ ,_TE@]!$ 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;
~BiLzT1, Gz52^O: 5、 添加代码,编译运行程序。
U+R9bn ,FwpHs $A 三、程序代码
fV2w &:^3 }kG>6_p? ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Rl&nR$# #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
tOX-vQ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
tA]u=-_h #if _MSC_VER > 1000
T+q5~~\d #pragma once
NxSSRv^rx #endif // _MSC_VER > 1000
*zQhTYY #ifndef __AFXWIN_H__
h=Q2
?O8 #error include 'stdafx.h' before including this file for PCH
orOq5?3 #endif
EU
Z7?4o #include "resource.h" // main symbols
~)F_FS class CHookApp : public CWinApp
osc A\r {
nDcH;_<;9a public:
h$mGawvZ~ CHookApp();
PhAD:A // Overrides
\l%##7DRp] // ClassWizard generated virtual function overrides
a6@k*9D> //{{AFX_VIRTUAL(CHookApp)
|8tKN"QG public:
=YIosmr virtual BOOL InitInstance();
YYL3a=;`a virtual int ExitInstance();
#&ei //}}AFX_VIRTUAL
+IMt$}7[ //{{AFX_MSG(CHookApp)
+:W/=C
d(h // NOTE - the ClassWizard will add and remove member functions here.
ht#,v5oG>f // DO NOT EDIT what you see in these blocks of generated code !
EeHghq //}}AFX_MSG
\u04m}h] DECLARE_MESSAGE_MAP()
%k<+#j6ZH };
39MOqVc LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
bI^F( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-Kw7!
=_ g BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Kn1T2WSAg BOOL InitHotkey();
?9%$g?3Z BOOL UnInit();
TqSjL{l% #endif
X#Ob^E%J v,Zoy|Lu //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[kTckZv #include "stdafx.h"
nch#DE82 #include "hook.h"
f:t j
#include <windowsx.h>
6q8PLyIp #ifdef _DEBUG
yY{ #define new DEBUG_NEW
YeVo=hYH@ #undef THIS_FILE
EEMRy static char THIS_FILE[] = __FILE__;
\GV'{W+o2 #endif
;O|u`fAqT #define MAX_KEY 100
Rn`DUYg #define CTRLBIT 0x04
}u1h6rd ` #define ALTBIT 0x02
_Fn`G.r< #define SHIFTBIT 0x01
tt
CC]
Q #pragma data_seg("shareddata")
r&ys?@+G HHOOK hHook =NULL;
!@*= b1 UINT nHookCount =0;
{6%-/$LX static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
)c?nh3D static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
4;@L#Pzt static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Z
+O<IF% static int KeyCount =0;
<EdNF&S- static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
+z0s)HU>j #pragma data_seg()
qu^~K.I" HINSTANCE hins;
0|i|z!N> void VerifyWindow();
9Fw NX BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
[:}"MdU' //{{AFX_MSG_MAP(CHookApp)
UkXa mGoy3 // NOTE - the ClassWizard will add and remove mapping macros here.
%eh.@8GL` // DO NOT EDIT what you see in these blocks of generated code!
]826k pq_ //}}AFX_MSG_MAP
j<6+p
r END_MESSAGE_MAP()
F>5b[q6~4 g[HuIn/ CHookApp::CHookApp()
^go3F{;4i {
ggrkj0 // TODO: add construction code here,
lIZ&'
z // Place all significant initialization in InitInstance
x6$3KDQm }
8F'm#0 \.+:yV<$ CHookApp theApp;
;)SWwhQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Bj"fUI!dK {
:6Tv4ZUvcG BOOL bProcessed=FALSE;
&;`E3$> if(HC_ACTION==nCode)
u.*}'C>^^v {
4)>S3Yr if((lParam&0xc0000000)==0xc0000000){// Key up
KV-h~C switch(wParam)
OT$++cj^ {
JStEOQF4 case VK_MENU:
^. MaskBits&=~ALTBIT;
CJDNS21m break;
mB6%. " case VK_CONTROL:
GctV MaskBits&=~CTRLBIT;
OEX\]!3_Fm break;
us8HXvvp{ case VK_SHIFT:
d{7)_Sbky MaskBits&=~SHIFTBIT;
+WKN&@ break;
KfPgj default: //judge the key and send message
y&eU\>M break;
$dWYu"2CD }
~;YkR'q0_ for(int index=0;index<MAX_KEY;index++){
kBnb9'.A1 if(hCallWnd[index]==NULL)
c4r9k-w0E continue;
8H T3C\$s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+F%tBUY{< {
Ct zWdo. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`I4E':
ZG bProcessed=TRUE;
'm"Ez'sS }
a#x@e?GvI }
DO9K }
Zz]/4 4t else if((lParam&0xc000ffff)==1){ //Key down
]0SqLe switch(wParam)
g[uf
e< {
O(9*VoD case VK_MENU:
gjFQDrz( MaskBits|=ALTBIT;
?<5KLvG v break;
QAMcI:5 case VK_CONTROL:
1_]%, MaskBits|=CTRLBIT;
TJ>1?W\Z break;
baL<|&
c case VK_SHIFT:
=P_*.SgR MaskBits|=SHIFTBIT;
Sfp-ns32%A break;
y+V>,W)r7 default: //judge the key and send message
_^ic@h3'X~ break;
rYg%B6Fp }
(ip3{d{CT] for(int index=0;index<MAX_KEY;index++)
pp{GaCi {
e**'[3Y if(hCallWnd[index]==NULL)
*65~qAd continue;
(
z F_< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\hb$v {
Ts|;5ya5m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
83p8:C.Ze bProcessed=TRUE;
F1L[C4' }
&&m1_K }
T|j=,2_ }
=vriraV" if(!bProcessed){
q_L. Sy|) for(int index=0;index<MAX_KEY;index++){
A:(qF.Tm if(hCallWnd[index]==NULL)
QFoCi& continue;
tA'5ufj*: if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.I $+
E SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Q`4Ia<5B }
B[
D
s?: }
Bn=YGEvz }
g[~J107%A return CallNextHookEx( hHook, nCode, wParam, lParam );
h0$ \JXk }
\OWxf[ Lxv_{~I* BOOL InitHotkey()
so| U&`G {
<X5ge>. if(hHook!=NULL){
$fT#Wva-\d nHookCount++;
0>e]i[P. return TRUE;
%nE%^Enw }
<]|!quY<* else
SJ:Teab hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
vq-;wdq?2 if(hHook!=NULL)
_J#oAE5]! nHookCount++;
Ir*{IVvej return (hHook!=NULL);
+qqCk }
C7}iwklcsa BOOL UnInit()
klY, @ {
twK 3 if(nHookCount>1){
RyM29uD nHookCount--;
IjQgmS~G return TRUE;
FL&Y/5 }
=^l`c$G< BOOL unhooked = UnhookWindowsHookEx(hHook);
">S1,rhgS if(unhooked==TRUE){
w\V<6_[vv. nHookCount=0;
7s2*VKr hHook=NULL;
0tPwhJ }
"gDk?w return unhooked;
JE*?O*&|Q }
:<0lC j wyAh%'V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
p6)6Gcx {
|
>yc|W BOOL bAdded=FALSE;
9 }42s + for(int index=0;index<MAX_KEY;index++){
J~ +p7S if(hCallWnd[index]==0){
EU'rdG*t/R hCallWnd[index]=hWnd;
k)y<iHR_o HotKey[index]=cKey;
A1z<2.R HotKeyMask[index]=cMask;
Y$j!-l5z bAdded=TRUE;
hewc5vrL KeyCount++;
P=9UK`n break;
r?^L/HGc }
}jFRuT;35 }
PpNG`_O return bAdded;
^EW6}oj[ }
NqFfz9G) v:>sS_^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[biz[fm {
Zw%:mZN
BOOL bRemoved=FALSE;
+UTBiB R for(int index=0;index<MAX_KEY;index++){
;vWJOvM2 if(hCallWnd[index]==hWnd){
f}ch1u> if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fjuPGg~ hCallWnd[index]=NULL;
*#@{&Q(Qh HotKey[index]=0;
,:V[H8 ? HotKeyMask[index]=0;
1:./f|m bRemoved=TRUE;
I?%#`Rvu KeyCount--;
iU=:YPE+. break;
u09D`QPP] }
+>c%I&h}` }
+#A~O4%t }
/len8FRf return bRemoved;
beV+3HqB8 }
DiZv sc #!_ViG )2^ void VerifyWindow()
="Azg8W {
<A`SC;k\u for(int i=0;i<MAX_KEY;i++){
km`";gUp> if(hCallWnd
!=NULL){ Pi,86?
if(!IsWindow(hCallWnd)){ ^%Ln@!P
hCallWnd=NULL; ~(`MP<
HotKey=0; F<dhG>E9
HotKeyMask=0; O@:R\MwFOZ
KeyCount--; )]E?~ $,
} rg]z
} !.4q{YWcYk
} ,zJ:a>v
} -b?s\X
hQvI}
BOOL CHookApp::InitInstance() V{\1qg{
{ T$;BZ=_
AFX_MANAGE_STATE(AfxGetStaticModuleState()); M~Er6Zg
hins=AfxGetInstanceHandle(); _=cuOo"!
InitHotkey(); 55,2eg#{O
return CWinApp::InitInstance(); `>lY$EBG@[
} wNNg"}&P
9OlJC[
int CHookApp::ExitInstance() ?/~Q9My
{ kn`O3cW/
VerifyWindow(); 0fV}n:4Pq
UnInit(); "-G7eGQ
return CWinApp::ExitInstance(); Kv#Q$$)r
} `nc=@" 1
n*#HokX
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _U,Hi?b"$}
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t+,2 p|B
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0a,B&o1
#if _MSC_VER > 1000 UA4MtTp`
#pragma once hxw6^EA
#endif // _MSC_VER > 1000 %xp 69
?]+!gz1
class CCaptureDlg : public CDialog >J:liB|(
{ 8zjJshE/
// Construction _5OxESE
public: *hpS/g/3\
BOOL bTray; R(f%*S4
BOOL bRegistered; ndk~(ex|j
BOOL RegisterHotkey(); wawJZ+V
UCHAR cKey; lt\Bm<"z!1
UCHAR cMask; &F'n
>QT9q
void DeleteIcon(); M`)3(|4
void AddIcon(); EQ"+G[j~x
UINT nCount; Z8f?uF
void SaveBmp(); 20:![/7:!
CCaptureDlg(CWnd* pParent = NULL); // standard constructor <" 0b8 Z
// Dialog Data P#rS.CIh
//{{AFX_DATA(CCaptureDlg) X'xnJtk
enum { IDD = IDD_CAPTURE_DIALOG }; Q Vl"l'e8
CComboBox m_Key; _! ?a9
BOOL m_bControl; o,$K=#Iv
BOOL m_bAlt; (SA^>r
BOOL m_bShift; ],'"iVh
CString m_Path; dMI G2log
CString m_Number; ~Ds3-#mMy
//}}AFX_DATA {qs>yQ6a:-
// ClassWizard generated virtual function overrides r=]$>&
//{{AFX_VIRTUAL(CCaptureDlg) L;6{0b58$
public: [?XP[h gd
virtual BOOL PreTranslateMessage(MSG* pMsg); Dh<}j3]
protected: :*t5?
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <uo@k'
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /8 "rCh|m-
//}}AFX_VIRTUAL }z2[w@M
// Implementation VLfKN)g
protected: <EY{goW
HICON m_hIcon; AMK(-=
// Generated message map functions D23 c/8K
//{{AFX_MSG(CCaptureDlg) g?@fHFct
virtual BOOL OnInitDialog(); wb39s^n
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @z=L\e{
afx_msg void OnPaint(); f$--y|=
afx_msg HCURSOR OnQueryDragIcon(); :edy(vC<
virtual void OnCancel(); \9}DAM_
afx_msg void OnAbout(); Sh:_YD^(
afx_msg void OnBrowse();
| 1a}p
afx_msg void OnChange(); ^bLFY9hSC
//}}AFX_MSG o76{;Bl\O
DECLARE_MESSAGE_MAP() iUZV-jl2/
}; .
\8"f]~
#endif &QFc)QP{
K :>O X
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e^N}(Kpy
#include "stdafx.h" \AB)L{
#include "Capture.h" nUCOHVI7
#include "CaptureDlg.h" ^3QJv{)Q
#include <windowsx.h> {9cjitl
#pragma comment(lib,"hook.lib") zT>BC}~.b
#ifdef _DEBUG lx> ."rW
#define new DEBUG_NEW lnK#q.]
#undef THIS_FILE 5!Ovd
O}g
static char THIS_FILE[] = __FILE__; YU\k D
#endif $KS!vS7
#define IDM_SHELL WM_USER+1 qTGi9OP6/
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gN]\#s@[
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~9@83Cs2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; HKVtO%&
class CAboutDlg : public CDialog VuD{t%Jb
{ :4r*Jju<V
public: AP ]`'C
CAboutDlg(); P#[?Kfi
// Dialog Data ju1B._48
//{{AFX_DATA(CAboutDlg) |w5,%#AeO$
enum { IDD = IDD_ABOUTBOX }; {TDZDH
//}}AFX_DATA ((=T E
// ClassWizard generated virtual function overrides aYc^ 9*7
//{{AFX_VIRTUAL(CAboutDlg) !.499H3
protected: !1Ht{cA0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wEQZ9?\
//}}AFX_VIRTUAL T9Fe!yVA
// Implementation v[)8 1uY
protected: b,>>E^wd!
//{{AFX_MSG(CAboutDlg) 3u<
ntx ><
//}}AFX_MSG 2q*wYuc
DECLARE_MESSAGE_MAP() bHQ) :W
}; 7;pQ'FmZJ
bRr3:"=sE
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F45-M[z
{ /<Z3x
_c
//{{AFX_DATA_INIT(CAboutDlg) U/_hH*N"!
//}}AFX_DATA_INIT xtK\-[n
} ` }B,w-,io
')Y1cO
void CAboutDlg::DoDataExchange(CDataExchange* pDX) e$&n)>%
{ F3L+X5D.yu
CDialog::DoDataExchange(pDX); LCuz_LTFq{
//{{AFX_DATA_MAP(CAboutDlg) 2rb@Md]dx
//}}AFX_DATA_MAP =q*c}8R_0
} yet~
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 69`*u<{PC
//{{AFX_MSG_MAP(CAboutDlg) Vlge*4q
// No message handlers Z*=$n_
G
//}}AFX_MSG_MAP l(\F2_,2W
END_MESSAGE_MAP() ?-tNRIPW@p
D
,[yx='
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +=sw&DH
: CDialog(CCaptureDlg::IDD, pParent)
[X*u`J
{ bD-OEB
//{{AFX_DATA_INIT(CCaptureDlg) B>@l(e)b
m_bControl = FALSE; k$>5v +r0
m_bAlt = FALSE; #WS>Z3AY
m_bShift = FALSE; '%YE#1*gH
m_Path = _T("c:\\"); 8s
%YudW
m_Number = _T("0 picture captured."); L~RFI&b
nCount=0; c0;rvw7
bRegistered=FALSE; ^F&j;8U
bTray=FALSE; e0j4t-lL
//}}AFX_DATA_INIT whm|"}x)u
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Xg;;<
/Z
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); mA@!t>=oMq
} kI2+&
Ejnk\ 8:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /Z[HU{4
{ /rky
CDialog::DoDataExchange(pDX); :zNNtv iA
//{{AFX_DATA_MAP(CCaptureDlg) 9'@G7*Yn
DDX_Control(pDX, IDC_KEY, m_Key); {|B[[W\TN
DDX_Check(pDX, IDC_CONTROL, m_bControl); 6;wKL?snO
DDX_Check(pDX, IDC_ALT, m_bAlt); S#<y_w%
DDX_Check(pDX, IDC_SHIFT, m_bShift); JoZSp"R
DDX_Text(pDX, IDC_PATH, m_Path); Ijk hV
DDX_Text(pDX, IDC_NUMBER, m_Number); 12;YxW>[
//}}AFX_DATA_MAP )uMv]
} d8U<V<H<
@4]{ZUV
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wvxsn!Ao&=
//{{AFX_MSG_MAP(CCaptureDlg) {R_ <m$
ON_WM_SYSCOMMAND() {'z$5<|
ON_WM_PAINT() A(n#k&W1fZ
ON_WM_QUERYDRAGICON() 0Ue~dVrM(?
ON_BN_CLICKED(ID_ABOUT, OnAbout) N
Hn#c3o
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _dmG#_1
ON_BN_CLICKED(ID_CHANGE, OnChange) 96P&+
//}}AFX_MSG_MAP NEvNj
END_MESSAGE_MAP() MSRk|0Mcr
i0zrXaKV
BOOL CCaptureDlg::OnInitDialog() tU *`X(;
{ b=U3&CV9
CDialog::OnInitDialog(); p#_5w
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); GLX{EG9Z
ASSERT(IDM_ABOUTBOX < 0xF000); E VC]B}
CMenu* pSysMenu = GetSystemMenu(FALSE); ayQeT
if (pSysMenu != NULL) drk BW}_
{ Od:-fw
CString strAboutMenu; ^P*-bV4
strAboutMenu.LoadString(IDS_ABOUTBOX); ~>P(nI
if (!strAboutMenu.IsEmpty()) 6As%<g=
{ D wr 9}Z-]
pSysMenu->AppendMenu(MF_SEPARATOR); Bf6i{`!G
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); E+LQyvF[
} cOZBl;}
} +S`cUn7
SetIcon(m_hIcon, TRUE); // Set big icon !IA\c(c^
SetIcon(m_hIcon, FALSE); // Set small icon UEhFId
m_Key.SetCurSel(0); M{)&SNI*C
RegisterHotkey(); B2a#:E,6
CMenu* pMenu=GetSystemMenu(FALSE); l(}MM|ka
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pOh<I{r1
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =Y5m% ,Bq
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -GM"gkz
return TRUE; // return TRUE unless you set the focus to a control hQlyqTP|2
} h+A+>kC5
]>Gi_20*.
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)
;NrPMz
{ &fl RrJ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) EU04U
{ l2}X\N&q
CAboutDlg dlgAbout; |\/\FK]?]
dlgAbout.DoModal(); =8%*Rrj^
} 1N:~5S}s>
else >EZZEd
{ -ZyY95E<
CDialog::OnSysCommand(nID, lParam); Q'JK *.l
} u6Wan*I?
} Y_EEnx&>i
+!!G0Zj/
void CCaptureDlg::OnPaint() K+XUC
{ %5DM ew
if (IsIconic()) d3S Me
{ .\&k]}0qA?
CPaintDC dc(this); // device context for painting ?u/UV,";y
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {?2|rv)
// Center icon in client rectangle 'W>y v
int cxIcon = GetSystemMetrics(SM_CXICON); <RZqs
int cyIcon = GetSystemMetrics(SM_CYICON); #f HnM+
CRect rect;
3bR%#G%
GetClientRect(&rect); ^SKHYo`,,N
int x = (rect.Width() - cxIcon + 1) / 2; )rt%.`
int y = (rect.Height() - cyIcon + 1) / 2; SMJRoK3
// Draw the icon E`<ou_0N@q
dc.DrawIcon(x, y, m_hIcon); {K6Z.-.`
} {
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else Cb`, N
{ ~G-W|>
CDialog::OnPaint(); 9 wbQ$>G9
} BV
}CmU&DA
} YOj&1ymBZ
~!Nw]lb!
HCURSOR CCaptureDlg::OnQueryDragIcon() 2|d^#8)ZC
{ F&m9G >r
return (HCURSOR) m_hIcon; WSN^iDS
} ?6hd(^
q\|RI;W
void CCaptureDlg::OnCancel() x[&<e<6
{ iyd$_CJ z
if(bTray) N)AlQ'Lwx
DeleteIcon(); VZ=:`)
CDialog::OnCancel(); \E<Qi3W>*
} G2?#MO
gmgri
void CCaptureDlg::OnAbout() >]xW{71F@
{ hITYBPqRO
CAboutDlg dlg; TI/RJF b
dlg.DoModal(); ,+4T7 U R
} U]_WX(4 @
eEP{?F^I[
void CCaptureDlg::OnBrowse() )KVr2y;RF
{ 5J|S6x\
CString str; v'b%m8
BROWSEINFO bi; 9==4T$nM[
char name[MAX_PATH]; L jTSu9I>
ZeroMemory(&bi,sizeof(BROWSEINFO)); l U4 I*
bi.hwndOwner=GetSafeHwnd(); |+::sL\r
bi.pszDisplayName=name; HKI\i)c
bi.lpszTitle="Select folder"; _SOwiz
bi.ulFlags=BIF_RETURNONLYFSDIRS; `O%nDry
LPITEMIDLIST idl=SHBrowseForFolder(&bi); b;5j awG
if(idl==NULL) i*m;kWu,
return; e&U$;sS`
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); dcD#!v\0
str.ReleaseBuffer(); &rD8ng+$
m_Path=str; D4|Ajeo;1
if(str.GetAt(str.GetLength()-1)!='\\') [ }Tb2|
m_Path+="\\"; r@qLG"[\c
UpdateData(FALSE); 9_iwikD
} wWfj#IB;R
q5= ,\S3=
void CCaptureDlg::SaveBmp() ]1W xa?
{ c s*E9
CDC dc; ~;H,cPvrEg
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9d-'%Q>+
CBitmap bm; B["+7\c<~
int Width=GetSystemMetrics(SM_CXSCREEN); oH?:(S(
int Height=GetSystemMetrics(SM_CYSCREEN); E;x-O)(&
bm.CreateCompatibleBitmap(&dc,Width,Height); EPH" 5$8
CDC tdc; P5oS 1iu*
tdc.CreateCompatibleDC(&dc); #$-?[c$>
CBitmap*pOld=tdc.SelectObject(&bm); oYTLC@98}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~%g,Uypi
tdc.SelectObject(pOld); ,d38TN
BITMAP btm; zIu/!aw
bm.GetBitmap(&btm); *jWh4F,
DWORD size=btm.bmWidthBytes*btm.bmHeight; f$kbb6juL
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); n8=Dzv0
BITMAPINFOHEADER bih; 8IQ}%|lN
bih.biBitCount=btm.bmBitsPixel; +hr|$
bih.biClrImportant=0; l!Xj UnRF
bih.biClrUsed=0; Ky,upU
bih.biCompression=0; `PL}8ydZ
bih.biHeight=btm.bmHeight; N>"L2E=z$|
bih.biPlanes=1; Z_4%Oi
bih.biSize=sizeof(BITMAPINFOHEADER); *AW v
bih.biSizeImage=size; fW+"Kuw
bih.biWidth=btm.bmWidth; ^uN[rHZ*u
bih.biXPelsPerMeter=0; a{Y|`*7y
bih.biYPelsPerMeter=0; 3en67l
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); l5Ko9CG
static int filecount=0; aF+Lam(
CString name; [J}eNprg
name.Format("pict%04d.bmp",filecount++); gN:F5 0
name=m_Path+name; 7x>^ip"7
BITMAPFILEHEADER bfh; Q2r[^Z
bfh.bfReserved1=bfh.bfReserved2=0; ;*j
K!
bfh.bfType=((WORD)('M'<< 8)|'B'); Z'y &11
bfh.bfSize=54+size; r(uo-/7z
bfh.bfOffBits=54; oxN5:)
CFile bf; EFh^C.S8
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1.3dy]vG
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 43B0ynagN
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
I[\7Bf
bf.WriteHuge(lpData,size); uGb+ *tD
bf.Close(); lGWz
nCount++; U'(zKqC
} H@G$K@L
GlobalFreePtr(lpData); 'G>XI;g
if(nCount==1) IauLT;! X
m_Number.Format("%d picture captured.",nCount); pC,[!>0g8
else @W/k}<07
m_Number.Format("%d pictures captured.",nCount); p|A ?F0
UpdateData(FALSE); b3R(O|
} Kmaz"6A
l~o!(rpX
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?2~fvMWu
{ [1kQ-Ko`
if(pMsg -> message == WM_KEYDOWN) 0>td[f
{ F%o!+%&7
if(pMsg -> wParam == VK_ESCAPE) YSt*uOZK
return TRUE; r|4D.O]
if(pMsg -> wParam == VK_RETURN) 'q$ Ym0nL
return TRUE; .#SgU<Wq
} 1~K'r&
return CDialog::PreTranslateMessage(pMsg); Bt}90#
} jIe
/X]
~ E6e~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y.D+M$f
{ gs3(B/";c
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z=U+FHdh/-
SaveBmp(); W0 sLMHq
return FALSE; UH%H9;
,$]
} E9j<+Ik
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2DFsMT>X
CMenu pop; ZM -P
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :2S?|7U4
CMenu*pMenu=pop.GetSubMenu(0); L+%kibnY'
pMenu->SetDefaultItem(ID_EXITICON); Os$E,4,py
CPoint pt; upaP,ik}~
GetCursorPos(&pt); V.*M;T\i
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *1kFy_Gx
if(id==ID_EXITICON) aH uMm&
DeleteIcon(); qKd ="PR}
else if(id==ID_EXIT) o
[V8h@K)
OnCancel(); l9Ol|Cb&
return FALSE; n8; p]{
} EG`AkWy
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cb]X27uww
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) YFJaf"?8g
AddIcon(); JZ-@za6u
return res; ^-q{:lx
} <Qih&P9;>
(i%bQZt^?
void CCaptureDlg::AddIcon() Xzg >/w
8J
{ vkhPE(f
NOTIFYICONDATA data; &-Ch>:[
data.cbSize=sizeof(NOTIFYICONDATA); r/AOgS
CString tip; hDB(y4/
tip.LoadString(IDS_ICONTIP); 3WQa^'u
data.hIcon=GetIcon(0); uGC5XX^
data.hWnd=GetSafeHwnd(); %\48hSe
strcpy(data.szTip,tip); TCRTC0_}k
data.uCallbackMessage=IDM_SHELL; V;MmPNP|
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;a1DIUm'
data.uID=98; q C cLd7`$
Shell_NotifyIcon(NIM_ADD,&data); [HWVS
ShowWindow(SW_HIDE); |X:`o;Uma
bTray=TRUE; uXFI7vV6P
} /mz.HCs
Ro9:kEG$
void CCaptureDlg::DeleteIcon() 6Y]P7j
{ ,.ivdg(/
NOTIFYICONDATA data; oOND]>
data.cbSize=sizeof(NOTIFYICONDATA); "y"oV[`
data.hWnd=GetSafeHwnd(); &Hp*A^M
data.uID=98; (c)/&~aE
Shell_NotifyIcon(NIM_DELETE,&data); tkHmH/'7
ShowWindow(SW_SHOW); )e3w-es~4
SetForegroundWindow(); DmuQE~DV
ShowWindow(SW_SHOWNORMAL); p
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`
bTray=FALSE; !q,'k2=b,
} JRz)A4P
N9G xJ6
void CCaptureDlg::OnChange() .lb]Xa*n
{ 1T|")D
RegisterHotkey(); `B3-#!2X
} Izu____
4w ,L
BOOL CCaptureDlg::RegisterHotkey() w%qnH e9
{ X:Wd%CHP
UpdateData(); Yh1nXkA!V
UCHAR mask=0; Q<AOc\oO
UCHAR key=0; ~HGSA(
if(m_bControl) SF;\*]["f
mask|=4; zW#5 /*@
if(m_bAlt) fn
'n'X|
mask|=2; ]vf0 f,F
if(m_bShift) 3>7{Q_5
mask|=1; auAz>6L
key=Key_Table[m_Key.GetCurSel()]; MnFrQC
if(bRegistered){ hu0z
36
DeleteHotkey(GetSafeHwnd(),cKey,cMask); _J,rql@nG<
bRegistered=FALSE; d'MZ%.#
} QObVJg,GD
cMask=mask; 02[m{a-
cKey=key; Q?1.GuF
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a_}C*+D
return bRegistered; {0F/6GwUC
} "t^RZ45
f4.jWBF
四、小结 "$(D7yFO
tL;.vRx
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。