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:
\pzqUTk
~CQYF,[Th 一、实现方法
X9f!F2x ,R
j{^-k 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'fE^jqU Os?`!1- #pragma data_seg("shareddata")
r lalr+Rf HHOOK hHook =NULL; //钩子句柄
HNA/LJl[VU UINT nHookCount =0; //挂接的程序数目
,qgph^C static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
+fd^$Qd%K static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
RNyw`> static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
N1RZ static int KeyCount =0;
;[-dth static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
r@3VN~ #pragma data_seg()
0R,?$qM\ 7P`|wNq 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。
zR'lQ<u ,y[wS5li 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:
+8FlDiP :QnN7&j|(w BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
?~e 8:/@ cKey,UCHAR cMask)
_|x b)_ {
d/8I&{. BOOL bAdded=FALSE;
w.gI0` for(int index=0;index<MAX_KEY;index++){
9PA\Eo|Yb if(hCallWnd[index]==0){
-<gGNj.x- hCallWnd[index]=hWnd;
R=IZFwr HotKey[index]=cKey;
*dn~-W. HotKeyMask[index]=cMask;
\N\Jny bAdded=TRUE;
DiyviH KeyCount++;
'H<0:bQ=I break;
D7b<&D@ }
\v7M`! & }
6@-VLO))O return bAdded;
M`$s
dZ" }
}fW@8ji\ //删除热键
3_W1)vd{ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%aU4d
e^ {
6mJa BOOL bRemoved=FALSE;
zg!;g`Z@S for(int index=0;index<MAX_KEY;index++){
TOo0rcl if(hCallWnd[index]==hWnd){
Kb~s'cTxIO if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(yv&&Jc hCallWnd[index]=NULL;
O_#Ag K<A HotKey[index]=0;
LL+ROX^M HotKeyMask[index]=0;
~3Y)o|D3 bRemoved=TRUE;
ST3aiyG KeyCount--;
YFD'&N,sx break;
7z'l}*FRD }
~^QL"p:5| }
>|L,9lR_b }
=dD<[Iz6 return bRemoved;
?b0 VB }
%D|27gh (MiEXU~v TC1#2nE&T DLL中的钩子函数如下:
k:nR'TI D!kv+<+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8BC F.y {
W$7db%qFx BOOL bProcessed=FALSE;
ID"'`DKxe if(HC_ACTION==nCode)
pOlo_na}[ {
~9JU_R^%m if((lParam&0xc0000000)==0xc0000000){// 有键松开
6D,xs}j1 switch(wParam)
r3oAP[+n {
Qi',[Xmf case VK_MENU:
s5T$>+
a MaskBits&=~ALTBIT;
nS0K&MH6B break;
E~5r8gM,0 case VK_CONTROL:
.L[WvAo MaskBits&=~CTRLBIT;
h
V@C|*A break;
<JE-#i case VK_SHIFT:
TIbqUR MaskBits&=~SHIFTBIT;
jW5n^Y) break;
"$KU+? default: //judge the key and send message
76a+|TzR break;
vr<6j/ty }
$}0q=Lg%wv for(int index=0;index<MAX_KEY;index++){
0S <;T+WA if(hCallWnd[index]==NULL)
/T`L;YE continue;
"Zd4e2>{M\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B#'TF?HUEn {
TQDb\d8,f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!uLW-[F, bProcessed=TRUE;
QLYb>8?"C }
bE
_=L=NG }
R9Wh/@J] }
e0%?;w-TL else if((lParam&0xc000ffff)==1){ //有键按下
_Z'j%/-4@D switch(wParam)
})O^xF~ {
/gZrnd? case VK_MENU:
Qhb].V{utV MaskBits|=ALTBIT;
0UeDM* break;
SovK|b& case VK_CONTROL:
YRF%].A%2 MaskBits|=CTRLBIT;
A2VN%dB break;
K2,oP )0.Y case VK_SHIFT:
r+fR^hv MaskBits|=SHIFTBIT;
=D.M}xqo break;
t6&6kl default: //judge the key and send message
y*A#}b*0 break;
6]^;
s1! }
B`)o?GcVN for(int index=0;index<MAX_KEY;index++){
Cdl#LVqs if(hCallWnd[index]==NULL)
<d~P;R(@ continue;
*(@(9]B~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;u!qu$O {
[8AGW7_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
+L1%mVq]y bProcessed=TRUE;
Z- ;<R$ }
/v"u4Ipj }
l-4T Tg }
~Emeo&X if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
=,&PD(. for(int index=0;index<MAX_KEY;index++){
g#qt<d}j if(hCallWnd[index]==NULL)
|>a sGP continue;
"M5P-l$p} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
laN:H mR8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
ss'#sPX //lParam的意义可看MSDN中WM_KEYDOWN部分
hXdc5 ?i? }
Iih~W& }
YKq, `7"% }
IBWUXG; return CallNextHookEx( hHook, nCode, wParam, lParam );
z/u;afB9q }
&
.VciSq6 uTGd{w@]0| 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:
I*_@WoI* 8B;wn<O BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
pUx~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
KCd}N f$$l,wo 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:
X[b= 25Ct V8ka*VJ(B LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
j#d=V@=a {
YL\d2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
DJ;il)^ {
($EA/|z //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
a5jc8S> SaveBmp();
5BnO-[3 return FALSE;
4eTfb }
$j*%}x~[ …… //其它处理及默认处理
%Cbqi.iuQ }
OW1i{ I\E`xkbBu Cmg(#$X 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。
Q!8AFLff4 (hej
3;W 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。
r'xZF~}k"~ QPf*!E 二、编程步骤
k4jZu?\C] WrH7tz 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";
SskvxH+7 f*KNt_|: 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
-(9>{!",J %D_2; 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;
_<pSCR0 ^6j: lL 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;
]V*s-och' :U_k*9z}= 5、 添加代码,编译运行程序。
cM%I5F+n _$%.F|: 三、程序代码
|Qo`K%8 :N$^x /{ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
DXu915 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
FrBoE# #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6lw)L #if _MSC_VER > 1000
l"^'uGB'
#pragma once
Oz(0$c #endif // _MSC_VER > 1000
NrH2U Jm #ifndef __AFXWIN_H__
FJo?~ #error include 'stdafx.h' before including this file for PCH
_u TaN #endif
-t~l!!N( #include "resource.h" // main symbols
(os}s8cIh class CHookApp : public CWinApp
+{U0PI82 {
d-Vttxa6 public:
c,nE@~ul2 CHookApp();
&nkYJi(! // Overrides
Hhx"47: // ClassWizard generated virtual function overrides
Nn<TPT[, //{{AFX_VIRTUAL(CHookApp)
Vg'vL[Y public:
ZXV_Dc virtual BOOL InitInstance();
jp=z
^l virtual int ExitInstance();
F]]1>w*/0 //}}AFX_VIRTUAL
xUl=N //{{AFX_MSG(CHookApp)
!5I;3EN // NOTE - the ClassWizard will add and remove member functions here.
EH{m~x[Ei // DO NOT EDIT what you see in these blocks of generated code !
0Oy.&C T //}}AFX_MSG
|Iei!jm DECLARE_MESSAGE_MAP()
&?N1-?BjM };
Iz Vb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
3z7SK Gy BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
nvY3$ Ty BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0#1hkJ" BOOL InitHotkey();
M )4-eo BOOL UnInit();
]@E_Hx{S #endif
mQEE?/xX; +KV?W+g)` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
NG3!09eY #include "stdafx.h"
x(oL\I_Z #include "hook.h"
,z<J`n #include <windowsx.h>
Ze+p;v #ifdef _DEBUG
'}#=I 9=ss #define new DEBUG_NEW
6S]K@C=r #undef THIS_FILE
*IBT!@*Q& static char THIS_FILE[] = __FILE__;
<u "xHl8Io #endif
4<%(Y-_sF #define MAX_KEY 100
..jc^'L #define CTRLBIT 0x04
Mttt]] #define ALTBIT 0x02
7A:k #define SHIFTBIT 0x01
Bgb~ Tz' #pragma data_seg("shareddata")
KnL-qc HHOOK hHook =NULL;
MLD1%* &0 UINT nHookCount =0;
@bs
YJ4-V static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
s
Dq{h static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
7{jB!Xj static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
}!_x\eq^ static int KeyCount =0;
Jr|"QRC static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
r'bctFsD #pragma data_seg()
sBUK v(U) HINSTANCE hins;
F}9!k LR void VerifyWindow();
S-x'nu$u BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
pJ8;7u //{{AFX_MSG_MAP(CHookApp)
U\OfB'Dn // NOTE - the ClassWizard will add and remove mapping macros here.
E"i<fr
T // DO NOT EDIT what you see in these blocks of generated code!
%L;z ~C //}}AFX_MSG_MAP
a,eR'L<"*- END_MESSAGE_MAP()
'T=$Q%Qv VF#2I%R* CHookApp::CHookApp()
])`+
78 {
x=-dv8N? // TODO: add construction code here,
0,a/t
jSr // Place all significant initialization in InitInstance
=VA5!-6<Uq }
+yC ]f
b X}j WNN CHookApp theApp;
]QM{aSvXA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
i'XW)n {
N
RB>X BOOL bProcessed=FALSE;
_8zZ.~) if(HC_ACTION==nCode)
T}fH {
[l~Gwaul> if((lParam&0xc0000000)==0xc0000000){// Key up
;MSdTHN" switch(wParam)
(]cM; {
VtM:~|v case VK_MENU:
=Sjr*)<@j MaskBits&=~ALTBIT;
87&BF)] break;
2=R}u-@6p case VK_CONTROL:
W=QT-4 MaskBits&=~CTRLBIT;
S
^5EG;[ break;
{T;A50 case VK_SHIFT:
5&Y%N( MaskBits&=~SHIFTBIT;
S"-q*!AhK break;
D1xIRyc/ default: //judge the key and send message
~HW8mly' break;
dP[vXhc }
Z\1*g k for(int index=0;index<MAX_KEY;index++){
6Bv!t2 if(hCallWnd[index]==NULL)
%IAZU c continue;
?HD
eiJkX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!u)>XS^E {
W~" 'a9H/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gteG*p i bProcessed=TRUE;
ajr);xd }
_ ^ JhncL }
!V%h0OE\ }
D./!/>@f else if((lParam&0xc000ffff)==1){ //Key down
*U<l$gajq switch(wParam)
$!?tJ@{ {
Kp]\r-5UD> case VK_MENU:
z2.9l?"rfQ MaskBits|=ALTBIT;
%#AM }MWIa break;
Ai*R%# case VK_CONTROL:
)># Y,/q MaskBits|=CTRLBIT;
m=m T`EP break;
"c+j2f'f case VK_SHIFT:
jRn5)u MaskBits|=SHIFTBIT;
DHI%R< break;
)Z/L default: //judge the key and send message
hq[:U?!Tt break;
st7\k]J\ }
MC'2;, for(int index=0;index<MAX_KEY;index++)
N~=,RPjq {
{pWb*~!k if(hCallWnd[index]==NULL)
i>*|k] continue;
wSV}{9}wr% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b-/8R|Mem {
|qOoL*z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,0pCc< bProcessed=TRUE;
}q$6^y }
OuZPgN }
\]:}lVtxS }
hXAgT!ZD if(!bProcessed){
v0aV>-v for(int index=0;index<MAX_KEY;index++){
H\>0jr` if(hCallWnd[index]==NULL)
"r+ v^ continue;
R5"5Z?' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:m&cm%W]ts SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
w4AA4u }
Bd++G'FZ }
UnE[FYx }
|>'.( return CallNextHookEx( hHook, nCode, wParam, lParam );
},]G +L;R }
$ [t7&e _N @h BOOL InitHotkey()
;q"Yz-3 {
:cE6-Fv if(hHook!=NULL){
)qID<j# nHookCount++;
e=H,|)P return TRUE;
8h?):e }
NMy+=GZu^ else
-%G}T}"_ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
t| cL! if(hHook!=NULL)
$n><p>` nHookCount++;
}G/#Nb) return (hHook!=NULL);
DN X-\ }
7Rq|N$y.3 BOOL UnInit()
n5NwiSE {
#^>Md59N if(nHookCount>1){
15l{gbCW nHookCount--;
I$y6N"| return TRUE;
w7d<Ky_C }
o9XT_!Cwg BOOL unhooked = UnhookWindowsHookEx(hHook);
r3}Q1b& if(unhooked==TRUE){
\3hj/ nHookCount=0;
*x<3=9V hHook=NULL;
?cB:1?\j }
<i$ud&D return unhooked;
\/8oua_) }
m~f J_ m>:zwz< ; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
SDbR(oV {
Ovhd%qV;Y BOOL bAdded=FALSE;
yQ03&{# for(int index=0;index<MAX_KEY;index++){
2uEvu if(hCallWnd[index]==0){
Lu.C+zgQ hCallWnd[index]=hWnd;
@ L=dcO{r HotKey[index]=cKey;
K2o\+t HotKeyMask[index]=cMask;
US'rhSV bAdded=TRUE;
Chs#}=gzi KeyCount++;
xX:N- break;
n5U-D0/Q }
nYb{?{_ca8 }
dRGgiQO return bAdded;
EpCT !e }
%>z)Q lh]Q\ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
hMNC] {
JBK(Nk BOOL bRemoved=FALSE;
C[JGt9{Y for(int index=0;index<MAX_KEY;index++){
}~O`(mnD}K if(hCallWnd[index]==hWnd){
\2^_v'
>K if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
;%<R>gDWv hCallWnd[index]=NULL;
O/ih9, HotKey[index]=0;
cYx.<b
JH HotKeyMask[index]=0;
0_f6Qrcj bRemoved=TRUE;
N3m~nEj KeyCount--;
%NH{%K, break;
*=)kR7,]9d }
>g+e`!;6 }
2)F~
}
w7e+~8| return bRemoved;
*%aWGAu: }
Z[GeU>?P 5<77o| void VerifyWindow()
KM9) {
$gPR3*0 for(int i=0;i<MAX_KEY;i++){
',l}$]y5 if(hCallWnd
!=NULL){ 8r\;8all
if(!IsWindow(hCallWnd)){ Y7GHIzX
hCallWnd=NULL; @\?QZX(H
HotKey=0; "~,3gNTzV
HotKeyMask=0; %SC%#_7
KeyCount--; 1$RUhxT
} ;8iK] ;^
} f2]O5rXp
} TD^w|U.
} !WgVk7aP`
C#oH7o+_.
BOOL CHookApp::InitInstance() [eLU}4v{
{ Z` zyEP A
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (&@,Z I;
hins=AfxGetInstanceHandle(); =;m;r!,K
InitHotkey(); di|5|bn7
return CWinApp::InitInstance(); Z~6PrM-M
} O!ngQrI
S7kZpD$
int CHookApp::ExitInstance() ;0JK>c
]#
{ e"^n^_9
VerifyWindow(); `&/~%>
UnInit(); Z9p`78kYyh
return CWinApp::ExitInstance(); *Hed^[sO
} ( SiwO.TZ
4<<T#oW.:G
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;vp[J&=
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q'CtfmI`r=
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9
lH00n+'
#if _MSC_VER > 1000 TYu(;~
#pragma once Q$:>yveR*
#endif // _MSC_VER > 1000 lEr_4!h$rZ
hMQh?sF/
class CCaptureDlg : public CDialog k3VRa|Y")
{ t_NnQ4)=
// Construction vE$n0bL2
public: 17) `CM$<[
BOOL bTray; P0O=veCf
BOOL bRegistered; 9^2l<4^Z
BOOL RegisterHotkey(); ]MaD7q>+R
UCHAR cKey; .3:s4=(f
UCHAR cMask; "jA?s9
void DeleteIcon(); Yue#
void AddIcon(); Sc,ajT
UINT nCount; 3c[< #]8S
void SaveBmp(); 4H@K?b`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor g'<ekY+V:
// Dialog Data jlb=]hp8%
//{{AFX_DATA(CCaptureDlg) 2|:x_rcj
enum { IDD = IDD_CAPTURE_DIALOG }; K['Gp>l
CComboBox m_Key; nmy!.0SQ-
BOOL m_bControl; dA[S@ysvG
BOOL m_bAlt; ]`T*}$|
BOOL m_bShift; 5o2vj8::
CString m_Path; hw)#TEt
CString m_Number; 'E_~>
//}}AFX_DATA p)YI8nW
// ClassWizard generated virtual function overrides .u^4vVz
//{{AFX_VIRTUAL(CCaptureDlg) V}po
public: yd~}CF
virtual BOOL PreTranslateMessage(MSG* pMsg); P{[@t_
protected: mgI 7zJX
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AEO7I
f@
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $G D@e0
//}}AFX_VIRTUAL du_TiI
// Implementation WEsX+okj
protected: w)Wg 8
HICON m_hIcon; i_ z4;%#?
// Generated message map functions 2e*"<>aeq
//{{AFX_MSG(CCaptureDlg) oQ/ Dg+Xp
virtual BOOL OnInitDialog(); 7CV}QV}G
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "Wn8}T*
afx_msg void OnPaint(); )I(2t 6i
afx_msg HCURSOR OnQueryDragIcon(); &p83X
virtual void OnCancel(); w[hT,$n
afx_msg void OnAbout(); OTV$8{
afx_msg void OnBrowse(); I*OJPFZ^4
afx_msg void OnChange(); QNxY`
//}}AFX_MSG MwO`DrV
DECLARE_MESSAGE_MAP() zwJK|S k
}; mm9xO%
#endif L/7YI\C2
zOsk'ZE&
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _6Qb 3tl
#include "stdafx.h" (\*+HZ`(Uu
#include "Capture.h" hVf;{p
&
#include "CaptureDlg.h" P`]p&:
#include <windowsx.h> q-R'5p\C?|
#pragma comment(lib,"hook.lib") (^9dp[2
#ifdef _DEBUG 2x<4&^
#define new DEBUG_NEW 0o_wy1O1,
#undef THIS_FILE 3Sl2c
static char THIS_FILE[] = __FILE__; .xV^%e?H
#endif 3.E3}Jz`
#define IDM_SHELL WM_USER+1 2Wp)CI<\D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g#s hd~e
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CCp&+LRvR
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ql2O%B.6?
class CAboutDlg : public CDialog *Fu;sR2y%:
{ la{Iqm{i
public: GPLq$^AH
CAboutDlg(); >A
?{cbJ
// Dialog Data &N:`Rler
//{{AFX_DATA(CAboutDlg) NhF<2[mt
enum { IDD = IDD_ABOUTBOX }; {/}p"(^
//}}AFX_DATA ~LSD\+
// ClassWizard generated virtual function overrides iiD}2yb
//{{AFX_VIRTUAL(CAboutDlg) ZxU3)`O
protected: 94b*
!Z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {~{</ g/
//}}AFX_VIRTUAL p$_X\,F
// Implementation t;L7H E@Y
protected: d[$YTw
//{{AFX_MSG(CAboutDlg) O#3PUuE%d
//}}AFX_MSG f0]`TjY
DECLARE_MESSAGE_MAP() r0j+P%
}; ' T%70)CM~
Ot([5/K
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $ i;_yTht
{ x
A"V!8C
//{{AFX_DATA_INIT(CAboutDlg) ^gdv:[m
//}}AFX_DATA_INIT 7?a!x$-U(
} E)]RQ~jY?
>@uF ye$
void CAboutDlg::DoDataExchange(CDataExchange* pDX) B0$.oavC
{ k.Q4oyei
CDialog::DoDataExchange(pDX); 6y
//{{AFX_DATA_MAP(CAboutDlg) a
n,$Z,G#K
//}}AFX_DATA_MAP _&}z+(Ug
} <nbc
RO.
Dx>~^ ^<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *28:|blbL
//{{AFX_MSG_MAP(CAboutDlg) [E6ZmMB&
// No message handlers {bMOT*X=A
//}}AFX_MSG_MAP :,1kSM%r
END_MESSAGE_MAP() ^zVW 3Y q
>v1ajI>O&{
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) idSc#n22
: CDialog(CCaptureDlg::IDD, pParent) ;`:A(yN]T
{ /`VrV{\/!
//{{AFX_DATA_INIT(CCaptureDlg) KvkU]s_
m_bControl = FALSE; |$&v)
m_bAlt = FALSE; dZ%rmTE(H
m_bShift = FALSE; OoOr@5g
m_Path = _T("c:\\"); $0P7^4)w:
m_Number = _T("0 picture captured."); cByUP#hW
nCount=0; K~Z$NS^W&
bRegistered=FALSE; ;b;Bl:%?
bTray=FALSE; *@zya9y9q
//}}AFX_DATA_INIT X-}]?OOs
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `|f1^C^
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $.T\dm-
} }CB9H$FkCY
|P(8T'
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j5V{,lf
{ WdJJt2'
CDialog::DoDataExchange(pDX); r>Cv@4/j
//{{AFX_DATA_MAP(CCaptureDlg) . E?a
DDX_Control(pDX, IDC_KEY, m_Key); Fd1jElt
DDX_Check(pDX, IDC_CONTROL, m_bControl); L]#b=Y
DDX_Check(pDX, IDC_ALT, m_bAlt); <z
R
CT
DDX_Check(pDX, IDC_SHIFT, m_bShift); #[yZP9
DDX_Text(pDX, IDC_PATH, m_Path); =L&dV]'4P
DDX_Text(pDX, IDC_NUMBER, m_Number); 9
gWqs'
//}}AFX_DATA_MAP 5[|ZceY
} 'NSfGC%7R
&9Xn:<"`)
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !G~`5?CvE
//{{AFX_MSG_MAP(CCaptureDlg) 7O\ Qxc\
ON_WM_SYSCOMMAND() 84f^==Y
ON_WM_PAINT() QM4O|x[
ON_WM_QUERYDRAGICON() 5"2pU{xmK
ON_BN_CLICKED(ID_ABOUT, OnAbout) Uo=_=.GQ
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Pm==m9
ON_BN_CLICKED(ID_CHANGE, OnChange) `*w!S8} m;
//}}AFX_MSG_MAP f=T&$tZ<
END_MESSAGE_MAP() `IH*~d]
3eR c>^wh
BOOL CCaptureDlg::OnInitDialog() !(#d7R
{ RLR\*dL1
CDialog::OnInitDialog(); |0xP'(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <P0&!yN
ASSERT(IDM_ABOUTBOX < 0xF000); VJOB+CKE
CMenu* pSysMenu = GetSystemMenu(FALSE); rB}2F*eT
if (pSysMenu != NULL) CC|=$(PgT
{ \.Z
/
CString strAboutMenu; LXf*
strAboutMenu.LoadString(IDS_ABOUTBOX); JV@b(x`
if (!strAboutMenu.IsEmpty()) 2*TPW
{ E3QyiW
pSysMenu->AppendMenu(MF_SEPARATOR); /A1qTG=Br
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `[F[0fY-
} 2|$G<f
} !MEA@^$#
SetIcon(m_hIcon, TRUE); // Set big icon - sL4tMP
SetIcon(m_hIcon, FALSE); // Set small icon _FP'SVa}D
m_Key.SetCurSel(0); Eu`K2_b
RegisterHotkey(); lc\%7-%:5
CMenu* pMenu=GetSystemMenu(FALSE); b0uWUI(=
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uy8mhB+]
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !m6=Us
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s(cC;
return TRUE; // return TRUE unless you set the focus to a control W
![*0pL
} ?$~5ti#\
Q&8epO |J
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F`M`c%
{ =PIarUJ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) }$@ EpM
{
A}G>JL
CAboutDlg dlgAbout; npMPjknl
dlgAbout.DoModal(); ".sRi
} kS<9cy[O
else 36\_Y?zx%
{ } T&~DVM
CDialog::OnSysCommand(nID, lParam); MTAq}8
} DTz)qHd#X
} i^}ib
RQbN
"Zu>cbE
void CCaptureDlg::OnPaint() Ug8>|wCE
{ <Y+>a#T
if (IsIconic()) ~qkn1N%'
{ DvY)n<U1qA
CPaintDC dc(this); // device context for painting hGbSN_F
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); G!E1N(%o
// Center icon in client rectangle ,$bK)|pGV
int cxIcon = GetSystemMetrics(SM_CXICON); u+qj_Ej
int cyIcon = GetSystemMetrics(SM_CYICON); A9o"L.o)
CRect rect; ub]"b[j\1
GetClientRect(&rect); 5v"S v
int x = (rect.Width() - cxIcon + 1) / 2; Esdw^MGL2
int y = (rect.Height() - cyIcon + 1) / 2; %nhE588xf
// Draw the icon <F?UdMT4y
dc.DrawIcon(x, y, m_hIcon); Jp-6]uW
} dyVfDF
else ?b x ak
{ >;+q,U}
CDialog::OnPaint(); ]
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} `ZGKM>q`
} T[%@B"
E^? 3P'%^
HCURSOR CCaptureDlg::OnQueryDragIcon() L16">,5
{ vQmqYyOc2
return (HCURSOR) m_hIcon; $Go)Zs-bL?
} {!xDJnF;
`gz/?q
void CCaptureDlg::OnCancel() ~'0W(~Q8
{ 7uq^TO>9f
if(bTray) Ny
G?^
DeleteIcon(); #]z_pp:
CDialog::OnCancel(); \CrWKBL
} =`.OKUAn
wW|[Im&
void CCaptureDlg::OnAbout() >r.W \
{ VF:95F;@
CAboutDlg dlg; FY"csZ
dlg.DoModal(); 3 uJ?;
} 6"/4@?
4ZtsLMwLD
void CCaptureDlg::OnBrowse() I8VCR8q
{ )wCV]TdF
CString str; NE+
;<mW
BROWSEINFO bi; z4 KKt&
char name[MAX_PATH]; rkn'1M&u
ZeroMemory(&bi,sizeof(BROWSEINFO)); N `[ ?db-%
bi.hwndOwner=GetSafeHwnd(); e@{Rlz
bi.pszDisplayName=name; Y?\PU{O
bi.lpszTitle="Select folder"; UnOcw
bi.ulFlags=BIF_RETURNONLYFSDIRS; K[l5=)G0L
LPITEMIDLIST idl=SHBrowseForFolder(&bi); MY l9 &8
if(idl==NULL) mT,#"k8
return; t(p}0}Pp
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V z-]H]MW,
str.ReleaseBuffer(); [}`-KpV!;
m_Path=str; Dr5AJ`y9A
if(str.GetAt(str.GetLength()-1)!='\\') >\[| c
m_Path+="\\"; PLRMW2
UpdateData(FALSE); }-~LXL%!3
} Rk!8eN Pf
vfdTGM`3
void CCaptureDlg::SaveBmp() rb*;4a
{ M=Y['wx
CDC dc; Kon|TeC>d
dc.CreateDC("DISPLAY",NULL,NULL,NULL); /&W~:F
CBitmap bm; ,AwX7gx22
int Width=GetSystemMetrics(SM_CXSCREEN); x+EEMv3u:
int Height=GetSystemMetrics(SM_CYSCREEN); h_15 " rd
bm.CreateCompatibleBitmap(&dc,Width,Height); yZc#@R[0
CDC tdc; z
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tdc.CreateCompatibleDC(&dc); Lmw4
CBitmap*pOld=tdc.SelectObject(&bm); _
qU-@Y$
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <KFl4A~
tdc.SelectObject(pOld); 2*a5pFkb
BITMAP btm; .1jeD.l
bm.GetBitmap(&btm); , FR/X/8
DWORD size=btm.bmWidthBytes*btm.bmHeight;
,1>n8f77]
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fPq)Lx1'
BITMAPINFOHEADER bih; m^>v~Q~~
bih.biBitCount=btm.bmBitsPixel; Pxf /*z
bih.biClrImportant=0; Suy +XHV
bih.biClrUsed=0; RKy!=#;17
bih.biCompression=0; LvNulMEK
bih.biHeight=btm.bmHeight;
75;g|+
bih.biPlanes=1; Nf%/)Tk
bih.biSize=sizeof(BITMAPINFOHEADER); Xo3@-D_c!c
bih.biSizeImage=size; &/(JIWc1su
bih.biWidth=btm.bmWidth; e*M-y C
bih.biXPelsPerMeter=0; ,O_iSohS
bih.biYPelsPerMeter=0; 1 Q*AQYVY
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Dq+S'x~>
static int filecount=0; Rw)=<XV)6
CString name; ( e4#9
name.Format("pict%04d.bmp",filecount++); Y|E rVf4
name=m_Path+name; QypUBf
BITMAPFILEHEADER bfh; #'BPW<Ob
bfh.bfReserved1=bfh.bfReserved2=0; 8wMwS6s:
bfh.bfType=((WORD)('M'<< 8)|'B'); <YvW /x
bfh.bfSize=54+size; BT"n;L?[
bfh.bfOffBits=54; wY3|5kbDj
CFile bf; eu'S~c-l
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h}Lrp r2r
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); GK1oS
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 395`Wkv
bf.WriteHuge(lpData,size); Q096M 0m
bf.Close(); f/t`B^}@
nCount++; )j. .)o
} c^stfFE&
GlobalFreePtr(lpData); ydMSL25<+
if(nCount==1) U04&z 91"
m_Number.Format("%d picture captured.",nCount); W0<2*7s
else vURgR
m_Number.Format("%d pictures captured.",nCount); Xn02p,,
UpdateData(FALSE); pO)5NbU
} kAq#cLprG
}8'b}7!
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) KBa0
{ d;i@9+
if(pMsg -> message == WM_KEYDOWN) 4+MaV<!tU^
{ M2I*_pI
if(pMsg -> wParam == VK_ESCAPE) 3Scc"9]
return TRUE; TQth"Cv2:
if(pMsg -> wParam == VK_RETURN) cp6I]#X
return TRUE; \-8aTF
} O=oIkvg
return CDialog::PreTranslateMessage(pMsg); j<)`|?@e(
} sfk;c#K
*!ecb1U5
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ZFs
xsg^r
{ Z9eP(ip
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1Cw
HGO
SaveBmp(); xqfIm%9i}
return FALSE; A2SDEVU
} kW=!RX[&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ KbMan~Pb6
CMenu pop; :QC |N@C
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));
g([M hf#
CMenu*pMenu=pop.GetSubMenu(0); AF>t{rw=/
pMenu->SetDefaultItem(ID_EXITICON); KW/LyiP#
CPoint pt; I3u)y|Y=
GetCursorPos(&pt); R{pF IyR
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4hzdc]
a
if(id==ID_EXITICON) @@ cc/S
DeleteIcon(); bnJ4Edy
else if(id==ID_EXIT) 7&u$^c S(
OnCancel(); WEtPIHruyt
return FALSE; G&08Qb ,N
} ZEso2|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;vy<!@Y;8
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J,\e@
AddIcon(); M 0$E_*
return res; FH%M5RD
} z\$( @:{A
)y{:Uc\4!
void CCaptureDlg::AddIcon() dWdD^>8Ef
{ r1 b"ta
NOTIFYICONDATA data; 6[?5hmc"w
data.cbSize=sizeof(NOTIFYICONDATA); {C0Y8:"`
CString tip; [&kz4_
tip.LoadString(IDS_ICONTIP); d4p6.3
data.hIcon=GetIcon(0); ';v1AX}5q
data.hWnd=GetSafeHwnd(); }}Z2@}
strcpy(data.szTip,tip); 6";
ITU^v
data.uCallbackMessage=IDM_SHELL; mF4y0r0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @9R78Zra
data.uID=98; )S;3WnQ)
Shell_NotifyIcon(NIM_ADD,&data); txE+A/>i9
ShowWindow(SW_HIDE); /fdrf
bTray=TRUE; zO@>)@~
} Jt0U`_
~/XDA:nfL:
void CCaptureDlg::DeleteIcon() XlnSh<e
{ ]B$J8.{q0
NOTIFYICONDATA data; a ,"
data.cbSize=sizeof(NOTIFYICONDATA); RhC|x,E
data.hWnd=GetSafeHwnd(); `3`.usw
data.uID=98; 8H|ac[hXK2
Shell_NotifyIcon(NIM_DELETE,&data); `YqXF=-
ShowWindow(SW_SHOW); F)v
SetForegroundWindow(); .R
l7,1\
ShowWindow(SW_SHOWNORMAL); Pm,.[5uc
bTray=FALSE; ,RW`9+gx
} cL][sI
pC #LQ
void CCaptureDlg::OnChange() /4@
[^}x
{ z:Z-2WV2o
RegisterHotkey(); SlwQ_F"4L
} JW)f'r_f
4c[/%e:\-
BOOL CCaptureDlg::RegisterHotkey() Y6Ux*vhK
{ Cy)N hgz
UpdateData(); {e q378d
UCHAR mask=0; 9M5W4&
UCHAR key=0; R_\o`v5
if(m_bControl) dMCoN8W
mask|=4; bwj{5-FU
if(m_bAlt) (.X)=
mask|=2; 1b86@f
if(m_bShift) aO S,%J^?
mask|=1; uB#U(
jl
key=Key_Table[m_Key.GetCurSel()]; [ D.%v~j
if(bRegistered){ C!ch
!E#
DeleteHotkey(GetSafeHwnd(),cKey,cMask); }r@yBUW
bRegistered=FALSE; r-yUWIr
S
} `'&mO9,<-
cMask=mask; J_;*@mW
cKey=key; s;Gg
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lRNm
&3:-
return bRegistered; Js vdC]+
} `(
w"{8laB
lcy<taNu)
四、小结 j9l32<h7]
3
^K#\*P
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。