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:
bvo
}b-]E
@'S !G"\ 一、实现方法
l,Ixz1S3e p*=9Ea: 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:
a#,lf9M Js!Zk\O #pragma data_seg("shareddata")
j<i:rk| HHOOK hHook =NULL; //钩子句柄
f&Meiu+ UINT nHookCount =0; //挂接的程序数目
GZ"J6/0-| static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
jyjK~!0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
k12mxR/ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Pe7%
9 static int KeyCount =0;
1
BVpv7@ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
5W?r04 #pragma data_seg()
D5
^Wi Q< VW9BQs2w 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。
Gt?ckMB [2ZZPY9?Q 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#zcD)w !rgdOlTR ^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
C`C$i>X7^ cKey,UCHAR cMask)
1He'\/# {
N/mC,7Q BOOL bAdded=FALSE;
y]E ?\03" for(int index=0;index<MAX_KEY;index++){
_{'HY+M if(hCallWnd[index]==0){
\o,`@2H+' hCallWnd[index]=hWnd;
1)wzSEV@ HotKey[index]=cKey;
,LJX HotKeyMask[index]=cMask;
qn R{'d bAdded=TRUE;
B1a&'WX? KeyCount++;
BM]sW:-v break;
vc(6lN9> }
fdTyY ; }
]i@VIvYq return bAdded;
bi[gyl# }
`;!v<@:i2 //删除热键
O
WVa&8O BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
geu8$^ {
efF>kcIC BOOL bRemoved=FALSE;
O486:tF for(int index=0;index<MAX_KEY;index++){
*.9.BD9 if(hCallWnd[index]==hWnd){
X+T
+y>ea if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fhp][)g; hCallWnd[index]=NULL;
~;0J4hR HotKey[index]=0;
pV^hZ. HotKeyMask[index]=0;
:K_JY bRemoved=TRUE;
}$|uIS KeyCount--;
!jxz2Q break;
{!hA^[}| }
Jm8#M z }
D0=H&Z[ }
P:yMj&) return bRemoved;
d`;_~{sleR }
{'#^ +kKfx! <t0o{}^P* DLL中的钩子函数如下:
ye)CfP=ID\ ?5!>k^q LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
G6(U\VFqO {
;F;`y), BOOL bProcessed=FALSE;
\^+=vO;A if(HC_ACTION==nCode)
)5U&^tJ {
BJI
R !J if((lParam&0xc0000000)==0xc0000000){// 有键松开
qE` switch(wParam)
VL/%D* {
~cSOni` case VK_MENU:
6
2r%q^r`i MaskBits&=~ALTBIT;
S5Q$dAL break;
{uRnZ/m case VK_CONTROL:
YRYAQj/7 MaskBits&=~CTRLBIT;
cM;&$IjCt break;
^L(}c O case VK_SHIFT:
iS^IqS MaskBits&=~SHIFTBIT;
/CAi%UH,F break;
S&@uY#_(*T default: //judge the key and send message
xhIC["z5 break;
FXPw 5 }
$b/oiy!=|3 for(int index=0;index<MAX_KEY;index++){
^MesP:[2 if(hCallWnd[index]==NULL)
bb6J$NR continue;
el*C8TWlw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
37@_" {
Q2)z1'Wv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
i!30f^9D-S bProcessed=TRUE;
:*"0o{
ie }
4#Fz!Km }
ruLi
"d }
KF|<A@V else if((lParam&0xc000ffff)==1){ //有键按下
]3C&l+m$ot switch(wParam)
X'Dg= | {
EF?@f{YY$n case VK_MENU:
EwcN$Ma MaskBits|=ALTBIT;
PYl(~Vac break;
W,iSN} case VK_CONTROL:
&LO<!WKQ MaskBits|=CTRLBIT;
(ROurq" break;
|:s4#3 case VK_SHIFT:
A`4j=OF\ MaskBits|=SHIFTBIT;
:mU,g|~55 break;
9i8D_[ default: //judge the key and send message
D84`#Xbi break;
U<**Est }
`<h}Ygo>k/ for(int index=0;index<MAX_KEY;index++){
\5$N>
2kO if(hCallWnd[index]==NULL)
3r?Bnf: continue;
Z_Ox ' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
is%qG?,P {
-bK# &o, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
x )wIGo bProcessed=TRUE;
k, )7v }
Uc6BI$Fmz }
Lnnl++8Y }
a3L]'E'*# if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
=j 6amk- for(int index=0;index<MAX_KEY;index++){
AAkdwo if(hCallWnd[index]==NULL)
@ba5iIt continue;
s%Q
pb{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^IuHc_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
xNTO59Y-s //lParam的意义可看MSDN中WM_KEYDOWN部分
n`T
4aDm }
2jf-vWV_ }
iKa}@U }
t nz
BNW8 return CallNextHookEx( hHook, nCode, wParam, lParam );
SeBbI&Ju }
:<w3.(Z <L@0w8i` 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
v6
DN:!& Rx*T7*xg{ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
L=Q-r[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z]> 0A ,ijgq EN 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
W$@q
~/E *usfJ- LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
P@:#NU[ {
+I#5? if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
gM20n^ {
2 As 4} //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
EN()dCQHr SaveBmp();
p%CAicn return FALSE;
34
W# }
Qw.""MLmN8 …… //其它处理及默认处理
vbmSbZ"y }
v8,+|+3 AZxx%6 A"k6n\!n; 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。
Aj.TX%}`h nbMnqkNb 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。
VcT(n7 {j[[E/8N!y 二、编程步骤
g.X?wyg5 $BG4M?Y 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
y@'8vOh` {IJV(%E 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
+/7UM x1 {%@zQ|OO0 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
}-k<>~FA @0?Mwy! 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
|cJyP9}n [[QrGJr 5、 添加代码,编译运行程序。
_wKFT> [kgT"?w= 三、程序代码
Q <EFd (F]f{8 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
/s(/6~D| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
ox] LlR K #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
|uQJMf[L) #if _MSC_VER > 1000
qr$=oCqa #pragma once
Yva^JB #endif // _MSC_VER > 1000
JJ q= {; #ifndef __AFXWIN_H__
cUaLv1:HI #error include 'stdafx.h' before including this file for PCH
DIH.c7o #endif
|X`xJL #include "resource.h" // main symbols
:#"gQ^YNp class CHookApp : public CWinApp
V{@<Z8sW# {
xZjD(e' public:
|Rw0$he CHookApp();
C
7YZ;{t // Overrides
b4!(~"b. // ClassWizard generated virtual function overrides
q/Ba#?sen //{{AFX_VIRTUAL(CHookApp)
MftW^7W- public:
{bl&r?[y virtual BOOL InitInstance();
^6mlE+WY virtual int ExitInstance();
JSt%L|}Y //}}AFX_VIRTUAL
$:s1x\ol //{{AFX_MSG(CHookApp)
K7Kd{9-2 // NOTE - the ClassWizard will add and remove member functions here.
1[C,*\X8v // DO NOT EDIT what you see in these blocks of generated code !
AQU4~g
mI //}}AFX_MSG
BbA>1#i5] DECLARE_MESSAGE_MAP()
Cp&lS= };
aAF:nyV~~0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
F*o{dLJ) BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
MQ5#6vJ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
x"K<@mR5G BOOL InitHotkey();
pMYEL BOOL UnInit();
Hu|NS {Ke- #endif
-RVwPY OljUK,I] //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
69ia # #include "stdafx.h"
U_m<W$"HF #include "hook.h"
m.EI("n"J #include <windowsx.h>
Gn#5zx#l #ifdef _DEBUG
s\1h=V)!H #define new DEBUG_NEW
7gfNe kr~W #undef THIS_FILE
q-eC=!#} static char THIS_FILE[] = __FILE__;
k/=J<?h0 #endif
.%<oy"_ #define MAX_KEY 100
E< "aUnI #define CTRLBIT 0x04
F:x" RbbF #define ALTBIT 0x02
cP`f\\c #define SHIFTBIT 0x01
rV)mcfw:Z #pragma data_seg("shareddata")
XU5/7
.
HHOOK hHook =NULL;
mS6
#\'Qa UINT nHookCount =0;
~t n*y4uK static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
N\l\ M static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
_N$3c<dY' static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
z 3fS+x:E{ static int KeyCount =0;
.slA} static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
z*>"I #pragma data_seg()
SN(:\|f
2 HINSTANCE hins;
k q8:h void VerifyWindow();
$IA(QC_]AO BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Oj\lg2Ck
//{{AFX_MSG_MAP(CHookApp)
HhhN8t // NOTE - the ClassWizard will add and remove mapping macros here.
D' ZR>@w@ // DO NOT EDIT what you see in these blocks of generated code!
hU3c;6]3 //}}AFX_MSG_MAP
L&MR%5 END_MESSAGE_MAP()
WW\u}z.QJ =LDzZ:' X CHookApp::CHookApp()
@
U'g}K {
G`9Ud // TODO: add construction code here,
*?Nrx=O* // Place all significant initialization in InitInstance
MzL^u8 }
|)* K#%j b4ZZyw CHookApp theApp;
8s-y+M@. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
msM {
"6 |j
0?Q BOOL bProcessed=FALSE;
d
}=fJ if(HC_ACTION==nCode)
_?M34&.X {
tisSj ?+ if((lParam&0xc0000000)==0xc0000000){// Key up
No>XRG+ switch(wParam)
XxcY {
m.pB]yq& case VK_MENU:
pYa8iQ`6U; MaskBits&=~ALTBIT;
('xIFi break;
zUXQl{ case VK_CONTROL:
I'HPy.PV MaskBits&=~CTRLBIT;
Zy|B~.@<j break;
D+P( case VK_SHIFT:
F{0Z MaskBits&=~SHIFTBIT;
BaZ$p O^ break;
'FgBYy/ default: //judge the key and send message
_t||v break;
X0Y1I}gD }
,Md8A`7x~ for(int index=0;index<MAX_KEY;index++){
]W~\%`#8? if(hCallWnd[index]==NULL)
:JH#*5%gQ: continue;
de1cl< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ckd@| {
7DDd1"jE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?;zu>4f| bProcessed=TRUE;
a\>+!Vq }
n/6#rj^$ }
NY
756B*
}
Atc9[<~WG else if((lParam&0xc000ffff)==1){ //Key down
<K; switch(wParam)
C]414Ibi {
%V71W3>6WS case VK_MENU:
b3F)$UQ MaskBits|=ALTBIT;
-0r0M) break;
v/*}M&vo case VK_CONTROL:
45. -P MaskBits|=CTRLBIT;
#%N v\g; break;
^MIF+/bQ case VK_SHIFT:
N;4bEcWjp MaskBits|=SHIFTBIT;
#V&98 F break;
?!^ow5"8 default: //judge the key and send message
O2;FaASF break;
)12.W=p }
{,NGxqhE for(int index=0;index<MAX_KEY;index++)
i)y8MlC{ {
3n;>k9{ if(hCallWnd[index]==NULL)
]xC#XYE:dy continue;
3.+TM]RYN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.2"-N5Z {
Wip@MGtJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
E! d?@Xr@ bProcessed=TRUE;
B|pO2de }
2?P H|| }
)Tjh
}
@W}cM if(!bProcessed){
Q2yD4>qy for(int index=0;index<MAX_KEY;index++){
eyW8?: if(hCallWnd[index]==NULL)
&H8wYs continue;
[As9&]Bv5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
F-AU'o
* SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
scX'>\w&c }
#lAC:>s3U }
uN>JX/- }
oCfO:7 return CallNextHookEx( hHook, nCode, wParam, lParam );
GT.1,E,Vw }
6&|hpp#[ Y`F) UwKK BOOL InitHotkey()
$B%wK`J {
}Q$}LR@ if(hHook!=NULL){
q9Zp8&<EqH nHookCount++;
j9gn7LS return TRUE;
G0#<SJ,) }
SU,G0. else
(P!r^87 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Z$?(~ln if(hHook!=NULL)
&O
+?#3 nHookCount++;
.3
>"qv return (hHook!=NULL);
|w5m2Z }
S[ch/ BOOL UnInit()
L~oy|K67 {
"<Ozoo1&w if(nHookCount>1){
L4O.= *P1 nHookCount--;
fGZ56eH: return TRUE;
&Va="HNKt }
W(pq_H' BOOL unhooked = UnhookWindowsHookEx(hHook);
v[;R(pt? if(unhooked==TRUE){
|RjAp.pm nHookCount=0;
tGE=!qk hHook=NULL;
Cj%n?- }
;w/@_!~ return unhooked;
>?<S( }
Tp46K\}Uf 8Q%g<jX* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CvhVV"n {
>$$z 6A[ BOOL bAdded=FALSE;
CbGfVdw/c for(int index=0;index<MAX_KEY;index++){
j,n\`7dD$ if(hCallWnd[index]==0){
[)+wke9 hCallWnd[index]=hWnd;
6am
g*=] HotKey[index]=cKey;
_'8P8T& HotKeyMask[index]=cMask;
J':X$>E| bAdded=TRUE;
p{
Xde KeyCount++;
ziDvDu= break;
GP>\3@> }
;b{yu| }
kEgpF{"%n return bAdded;
clG@]<a`_ }
7|5X> yt Ii9[[I BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ff{,zfN+3 {
BLN|QaZ BOOL bRemoved=FALSE;
3daI_Nx> for(int index=0;index<MAX_KEY;index++){
acrR if(hCallWnd[index]==hWnd){
AH{#RD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
cY5w,.Q/! hCallWnd[index]=NULL;
LZ34x: ,C HotKey[index]=0;
p}oGhO&= HotKeyMask[index]=0;
/4*Y#IpZ bRemoved=TRUE;
2FR+Z3&z KeyCount--;
Xh}S_/9}5 break;
+GJPj(S }
"1YwV~M5 }
>?Duz+W) }
1:JwqbZKJ return bRemoved;
[#=IKsO'R6 }
ZDG~tCh=@ l`uI K. void VerifyWindow()
7fI2b,~ {
7nm'v'\u+V for(int i=0;i<MAX_KEY;i++){
,,SV@y; if(hCallWnd
!=NULL){ IRGcE&m
if(!IsWindow(hCallWnd)){ h ;@c%Vm
hCallWnd=NULL; qnCjNN
HotKey=0; WBD?|Ss
HotKeyMask=0; He,,bq
KeyCount--; {dXTj 7
} N4#D&5I",
} Ngj&1Ta&[
} yR?./M!
} fy]c=:EmD
UX+vU@Co[
BOOL CHookApp::InitInstance() $xT9e
{ c/Fgx/hr
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;L,i">_%u[
hins=AfxGetInstanceHandle(); Xp] jF^5
InitHotkey(); j7U&a}(
return CWinApp::InitInstance();
1fvN[
} PB
*v45
[]v$QR&u#v
int CHookApp::ExitInstance() ta6>St7.
{ l\F71pwSI
VerifyWindow(); V@g v
UnInit(); [YP{%1*RM
return CWinApp::ExitInstance(); [GPCd@
} y XKddD
s`ZP2"`f
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file G^N@r:RS
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4Q/{lqG
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OP<N!y ?[
#if _MSC_VER > 1000 *Y?oAVkz
#pragma once 4(*PM&'R
#endif // _MSC_VER > 1000 )Gavjj&uJ
DuNindo8
class CCaptureDlg : public CDialog `m#-J;la
{ Vpne-PW
// Construction Jz=|-F(Sy
public: N8pV[\f
BOOL bTray; .XqeO@z
BOOL bRegistered; 81"` B2
BOOL RegisterHotkey(); Pz34a@%"
UCHAR cKey; =[8K#PZ$w
UCHAR cMask; _P=+\[|y
void DeleteIcon(); tAE(`ow/Ur
void AddIcon(); RyP MzxV
UINT nCount; I?St}Tl
void SaveBmp(); 5D.Sg;\
CCaptureDlg(CWnd* pParent = NULL); // standard constructor j g//I<D
// Dialog Data e
pp04~
//{{AFX_DATA(CCaptureDlg) 7*j!ZUzp
enum { IDD = IDD_CAPTURE_DIALOG }; Q5ff&CE
CComboBox m_Key; JOpH
Z?
BOOL m_bControl; T>]T=
BOOL m_bAlt; &e6UEG
BOOL m_bShift; (8aj`> y
CString m_Path; J^`5L7CO
CString m_Number; -uWV(
,|
//}}AFX_DATA Xp_m=QQsm
// ClassWizard generated virtual function overrides {g#4E0.A!
//{{AFX_VIRTUAL(CCaptureDlg) H0#=oJr$)W
public: i^e8.zgywF
virtual BOOL PreTranslateMessage(MSG* pMsg); F|{uA/P{
protected: 3rB0H
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,,BP}f+l$
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nj0sh"~+
//}}AFX_VIRTUAL l 9
wO x
// Implementation yhYF "~CM
protected: ,[IDC3.4^R
HICON m_hIcon; ^P^%Q)QXl
// Generated message map functions e*qGrg (E
//{{AFX_MSG(CCaptureDlg) M,S'4Szuk
virtual BOOL OnInitDialog(); $%q=tn'EX
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); nX 9]dz
afx_msg void OnPaint(); (5 @H
afx_msg HCURSOR OnQueryDragIcon(); ;xe.0j0h
virtual void OnCancel(); BO#tn{(#
afx_msg void OnAbout(); OtoM
afx_msg void OnBrowse(); \7i_2|w
afx_msg void OnChange(); +^lB"OcOX@
//}}AFX_MSG ?WHf%Ie2(
DECLARE_MESSAGE_MAP() # H
w(w
}; iX6>u4~(
#endif C&>*~
@`dg:P*[
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >xabn*Kq
#include "stdafx.h" #kASy 2t
#include "Capture.h" V0v,s^\H
#include "CaptureDlg.h" 7jIBE
#include <windowsx.h> A
$gn{ c
#pragma comment(lib,"hook.lib") 8'zZVX D<
#ifdef _DEBUG y7M{L8{0
#define new DEBUG_NEW Jr( =Y@Z'
#undef THIS_FILE 4[@YF@_=M
static char THIS_FILE[] = __FILE__; t|eH'"N%o
#endif EC;>-s
#define IDM_SHELL WM_USER+1 Cp(2]Eb
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vo`&
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O`c50yY
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Hl0"
zS[
class CAboutDlg : public CDialog =K18| Q0m
{ E{&MmrlL,
public: .a]#AFX
CAboutDlg(); -1,0hmn=+
// Dialog Data /V:9*C
//{{AFX_DATA(CAboutDlg) [K.1 X=O}
enum { IDD = IDD_ABOUTBOX }; q:/df]Ntt
//}}AFX_DATA 4lB??`UN
// ClassWizard generated virtual function overrides /W$i8g
//{{AFX_VIRTUAL(CAboutDlg) =&} _bd/]
protected: /j$=?Rp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +q}t%K5
//}}AFX_VIRTUAL 8^>c_%e}
// Implementation l P3|h*
protected: Si>38vCJ*
//{{AFX_MSG(CAboutDlg) v^b4WS+.:
//}}AFX_MSG (tX3?[ii
DECLARE_MESSAGE_MAP() +ODua@ULFB
}; OALNZKP
x_nwD"
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) WJOoDS!i
{ ? +L,
//{{AFX_DATA_INIT(CAboutDlg) \]V:>=ry>
//}}AFX_DATA_INIT C~B ]@xxK)
} ^;RK-)
80*hi)ux[
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b&+zAt.
{ \~l_w
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CDialog::DoDataExchange(pDX); `SFeln{1B
//{{AFX_DATA_MAP(CAboutDlg) <ToBVGX
//}}AFX_DATA_MAP Y/kq!)u;%L
} hc3hU
ZOqS"3j! j
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) x%=CEe?6
//{{AFX_MSG_MAP(CAboutDlg) FAEF
// No message handlers ]8\I{LR
//}}AFX_MSG_MAP s2{SbOBis
END_MESSAGE_MAP() Ev5~= ]
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fz=?QEG
: CDialog(CCaptureDlg::IDD, pParent) /RxP:>hVv
{ '\I(n|\
//{{AFX_DATA_INIT(CCaptureDlg) 2+gbMd4n
m_bControl = FALSE; p H y
m_bAlt = FALSE; C7FQc{
m_bShift = FALSE; y4Jc|)
m_Path = _T("c:\\"); I_ mus<sE
m_Number = _T("0 picture captured."); iPTQqx-m$7
nCount=0; Hw]E#S
bRegistered=FALSE; tp] 5[U
bTray=FALSE; V:kRr cX
//}}AFX_DATA_INIT .J)TIc__|A
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 T;/GHC`{Y
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |#@7$#j
} U =.PL\
G;l7,1;MU:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) v_!6S|
{ z%YNZ^d
CDialog::DoDataExchange(pDX); B$_4ul\)
//{{AFX_DATA_MAP(CCaptureDlg) ,x8;| o5
DDX_Control(pDX, IDC_KEY, m_Key); R ZY=c
DDX_Check(pDX, IDC_CONTROL, m_bControl);
vmqa_gU\
DDX_Check(pDX, IDC_ALT, m_bAlt);
@'R)$:I%L
DDX_Check(pDX, IDC_SHIFT, m_bShift); {Yj5Mj|#
DDX_Text(pDX, IDC_PATH, m_Path); OoSk^U)
DDX_Text(pDX, IDC_NUMBER, m_Number); ,-#MEr
//}}AFX_DATA_MAP x%}D+2ro-t
} u#@/^h;
W%!(kN&d
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) hpAdoy[
//{{AFX_MSG_MAP(CCaptureDlg) $N=&D_Q
ON_WM_SYSCOMMAND() R |c=I}@F
ON_WM_PAINT() xm{]|~^JG
ON_WM_QUERYDRAGICON() OyZR&,q
ON_BN_CLICKED(ID_ABOUT, OnAbout) %e E^Y<@g
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |h]V9=
ON_BN_CLICKED(ID_CHANGE, OnChange) fg^25g'_
//}}AFX_MSG_MAP ZRagM'K
END_MESSAGE_MAP() vA/SrX.
G)Gp}4gV}
BOOL CCaptureDlg::OnInitDialog() VL9wRu;
{ {]HiT pn
CDialog::OnInitDialog(); _Op%H)
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &kg^g%%
ASSERT(IDM_ABOUTBOX < 0xF000); _!03;zrO
CMenu* pSysMenu = GetSystemMenu(FALSE); kv:9Fm\$
if (pSysMenu != NULL) ,n/]ALz>~
{
,&hv x
CString strAboutMenu; V.GM$
strAboutMenu.LoadString(IDS_ABOUTBOX);
>2s4BV[(
if (!strAboutMenu.IsEmpty()) }iUK`e
{ Bu{Kjv
pSysMenu->AppendMenu(MF_SEPARATOR); }>xwiSF?
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); hQn?qJy%W
} <~smBd
} p;+O/'/j
SetIcon(m_hIcon, TRUE); // Set big icon "\b>JV5
SetIcon(m_hIcon, FALSE); // Set small icon RQ,#TbAe
m_Key.SetCurSel(0); D\Ak-$kJ^
RegisterHotkey(); QL/KY G
CMenu* pMenu=GetSystemMenu(FALSE); A[Mke
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~:a1ELqVw
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); UM7@c7B?
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {[H_Vl@
return TRUE; // return TRUE unless you set the focus to a control C*Vm}|)
} g&$=Y7G
tIuM9D{P
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *2/Jg'de
{ axC|,8~tq
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,;g%/6X
{ Z.\q$U7'9
CAboutDlg dlgAbout; ;I>nA6A
dlgAbout.DoModal(); cJ4My#w
} cJo%j -AM
else \O|SPhaIf
{ 7Jn%XxHq
CDialog::OnSysCommand(nID, lParam); `|'w]rj:"+
} `nPdZ.
} H/D=$)3op
F!vrvlD`s
void CCaptureDlg::OnPaint() j6qtR$l|
{ 7V"?o
if (IsIconic()) W'./p"2g
{ yYCS-rF>
CPaintDC dc(this); // device context for painting ?2<)
Jw
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); mfraw2H
// Center icon in client rectangle "DW ~E\Y
int cxIcon = GetSystemMetrics(SM_CXICON); l9.`2d]o
int cyIcon = GetSystemMetrics(SM_CYICON); k~tEUsv
CRect rect; Bz]tKJ
GetClientRect(&rect); )4g_S?l=
int x = (rect.Width() - cxIcon + 1) / 2; ^j<v~GTx+
int y = (rect.Height() - cyIcon + 1) / 2; ,->ihxf
// Draw the icon {T4_Xn -I
dc.DrawIcon(x, y, m_hIcon); OgF[=
} CD`a-]6qA
else HMq}){=S
{ [DaAvN^0A
CDialog::OnPaint(); Z0<Vss
} ,&o9\|ih7]
} k1B
](@xt
!1$x4 qxS
HCURSOR CCaptureDlg::OnQueryDragIcon() 7<j!qWm0
{ tia}&9;
return (HCURSOR) m_hIcon; Ic/hVKYG5
} v$}^$8`
I-#!mFl
void CCaptureDlg::OnCancel() u+)!C*ho
{ mY 1l2
if(bTray) TNu %_
34
DeleteIcon(); S@,/$L
CDialog::OnCancel(); )PN8HJAArh
} K?l|1jez(#
gfL :SP8
void CCaptureDlg::OnAbout() ('z=/"(l
{ xg p)G!
CAboutDlg dlg; .O-)m'5
dlg.DoModal(); =D(a~8&,
} ufL,Kq4
g#I`P&
void CCaptureDlg::OnBrowse() ;j0.#P:a
{ Q6
*n'6
CString str; {\$S585
BROWSEINFO bi; >k
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char name[MAX_PATH]; ?'V78N sA
ZeroMemory(&bi,sizeof(BROWSEINFO)); RRO@r}A!y
bi.hwndOwner=GetSafeHwnd(); 0}i
9`p
bi.pszDisplayName=name; lU1SN/'zx
bi.lpszTitle="Select folder"; e@hPb$7
bi.ulFlags=BIF_RETURNONLYFSDIRS; :DH@zR
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `gl?y;xC
if(idl==NULL) yCjc5d|tT
return; OS[
s Qo5
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?qQ{]_q1&.
str.ReleaseBuffer(); 3U6QYD55]]
m_Path=str; G"r{!IFL
if(str.GetAt(str.GetLength()-1)!='\\') tY_=[6?Zu
m_Path+="\\"; S]H[&o1o
UpdateData(FALSE); dX?j/M-
} G]B0LUT6c
>\JPX
void CCaptureDlg::SaveBmp() oIrc))j,$
{ ckX8eg!f
CDC dc; L91(|gQP
dc.CreateDC("DISPLAY",NULL,NULL,NULL); %jAc8~vW?
CBitmap bm; U#f*
int Width=GetSystemMetrics(SM_CXSCREEN); Zl5DlRuw
int Height=GetSystemMetrics(SM_CYSCREEN); br\3}
bm.CreateCompatibleBitmap(&dc,Width,Height); N<#J!0w
CDC tdc; k7Nx#%xx
tdc.CreateCompatibleDC(&dc); oypLE=H
CBitmap*pOld=tdc.SelectObject(&bm); ~vF*&^4Vh
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); O!Ue0\1Kj0
tdc.SelectObject(pOld); 2Wcu.
BITMAP btm; r,eH7&P9{
bm.GetBitmap(&btm); c<1$zQY!
DWORD size=btm.bmWidthBytes*btm.bmHeight; u/tJ])~@
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l<_v3/3
BITMAPINFOHEADER bih; !+$qSD,%x
bih.biBitCount=btm.bmBitsPixel; hx^@aI
bih.biClrImportant=0; S(=@2A+;
bih.biClrUsed=0; c:${qY:!
bih.biCompression=0; rT="ciQ
bih.biHeight=btm.bmHeight; ,IiKe_B
bih.biPlanes=1; 6UIS4_
bih.biSize=sizeof(BITMAPINFOHEADER); X[J<OTj`$
bih.biSizeImage=size; eGMw:H
bih.biWidth=btm.bmWidth; (F'~K,0
bih.biXPelsPerMeter=0; 2`i&6iz
bih.biYPelsPerMeter=0; [CHN3&l-5S
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #mH28UT
static int filecount=0; ?3DL .U{
CString name; :/->m6C`0
name.Format("pict%04d.bmp",filecount++); xEG:KSH
name=m_Path+name; @G&oUhS
BITMAPFILEHEADER bfh; `y'%dY}$n
bfh.bfReserved1=bfh.bfReserved2=0; 3B#fnj
bfh.bfType=((WORD)('M'<< 8)|'B'); 9Zx| L/\
bfh.bfSize=54+size; A7QT4h&6
bfh.bfOffBits=54; F]OWqUV
CFile bf; `@Z$+
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }r04*P(
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R1*&rjB
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5!Er;e
bf.WriteHuge(lpData,size); Fmn_fW6
bf.Close(); tdU'cc?M
nCount++; ,,FhE
} c'$y_]
GlobalFreePtr(lpData); 8?~>FLWTXZ
if(nCount==1) SP0ueAa}
m_Number.Format("%d picture captured.",nCount); ^C,rN;mX'
else E2hML
m_Number.Format("%d pictures captured.",nCount); V^(W)\
UpdateData(FALSE); 5P*jGOg .
} 319 4]
QP%AJ[3ea%
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .9DhD=8aIO
{
,-])[u
if(pMsg -> message == WM_KEYDOWN) OfLj 4H6Q
{ i?>>%juK
if(pMsg -> wParam == VK_ESCAPE) &*Z)[Bl
return TRUE; uvDOTRf
if(pMsg -> wParam == VK_RETURN) *o=Z~U9z
return TRUE; lyowH{.N"3
} Z'AjeZyyE
return CDialog::PreTranslateMessage(pMsg); "<oR.f=0
} wKW.sZ!S1
P EzT|uY
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UeUOGf ,
{ Na\&}GSf^
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ jcePSps]
SaveBmp(); SOD3MsAK
return FALSE; 1\TkI=N3
} B
\V;{:
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ c3fd6Je5
CMenu pop; x}C$/ 7^
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (>Sy,
CMenu*pMenu=pop.GetSubMenu(0); 1\jj3Y'i'
pMenu->SetDefaultItem(ID_EXITICON); I/h( *~/
CPoint pt; JWt@vf~
GetCursorPos(&pt); #,jm3Mqj
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 3&X5*-U
if(id==ID_EXITICON) 'fb&3
DeleteIcon(); ]<},[s
else if(id==ID_EXIT) ziAn9/sT
OnCancel(); P@etT8| V
return FALSE; V2Z^W^
} +5ql`C
LRESULT res= CDialog::WindowProc(message, wParam, lParam);
X/!Y mV!
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) nQw, /Lk
AddIcon(); ylmVmHmc
return res; * se),CP!s
} ~@^ pX*%i
OoOwEV2p_
void CCaptureDlg::AddIcon() <SRSJJR|(
{ Ze`ms96j{
NOTIFYICONDATA data; pfk)_;>,
data.cbSize=sizeof(NOTIFYICONDATA); kDKfJp&a
CString tip; ]{-ib:f~
tip.LoadString(IDS_ICONTIP); J<L"D/
data.hIcon=GetIcon(0); uN&49o
data.hWnd=GetSafeHwnd(); `)jAdad-s
strcpy(data.szTip,tip); $nthMx$
data.uCallbackMessage=IDM_SHELL; _hB7;N3
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; r^d:Po
data.uID=98; X)Rh&ui
Shell_NotifyIcon(NIM_ADD,&data); YZ0Q?7l7
ShowWindow(SW_HIDE); e<{Ani0
bTray=TRUE; bmC{d
} #1>c)_H
yV@~B;eW0
void CCaptureDlg::DeleteIcon() xqVIw!J?/}
{ U,9=&"e b
NOTIFYICONDATA data; Jpe\
data.cbSize=sizeof(NOTIFYICONDATA); ECOzquvM
data.hWnd=GetSafeHwnd(); ~RM_c
data.uID=98; xqKj&RuLu
Shell_NotifyIcon(NIM_DELETE,&data); [MM`#!K%
ShowWindow(SW_SHOW); uY)|
SetForegroundWindow(); JOq&(AZe
ShowWindow(SW_SHOWNORMAL); dqL)q 3
bTray=FALSE; i;<H^\%
} Ut"F b
:jWQev"/
void CCaptureDlg::OnChange() 6$+F5T
{ NSh~O!pX
RegisterHotkey(); tjy@sO/Q
} &C E){jC
1`&"U[{
BOOL CCaptureDlg::RegisterHotkey() ADZU?7)
{ w#$Q?u ,G
UpdateData(); =
:\o/)+
UCHAR mask=0; _AVP1
UCHAR key=0; ~p/1
9/
if(m_bControl) #c1c%27cmm
mask|=4; dBp)6ok#c
if(m_bAlt) /`B:F5r
mask|=2; y}lqF8s
if(m_bShift) 8z"*CJ@
mask|=1; *+cW)klm
key=Key_Table[m_Key.GetCurSel()]; &14Er,K
if(bRegistered){ %,5_]bGvb
DeleteHotkey(GetSafeHwnd(),cKey,cMask); xCiq;FFR
bRegistered=FALSE; [lAZ)6E~=
} 4}HY= 0Um
cMask=mask; >uDE<MUC
cKey=key; M,9f}V)
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *1b)Va8v*
return bRegistered; m:{IVvN_
} h-:te9p6>4
lxD~[e
四、小结 w'D=K_h
dX~$#-Ad86
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。