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:
toCT5E_0=
+O@0gl 一、实现方法
It@.U| Z tfPB 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:
mMvt#+O g k[8' #pragma data_seg("shareddata")
LN?W~^gsR HHOOK hHook =NULL; //钩子句柄
uN1O(s UINT nHookCount =0; //挂接的程序数目
u>.qhtm[ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
q G%'Lt static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
%A dE5HI- static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
R"=pAO.4l static int KeyCount =0;
xeX Pc7JG static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
0Y9\,y_ #pragma data_seg()
Iw$7f kq XaV h. 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
bgjo_!J+Pp /r Hd9^Y DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
3R[5prE< Q0_UBm^f BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
{\L /?# cKey,UCHAR cMask)
ZLJfSnB {
4`
gAluJ# BOOL bAdded=FALSE;
m. G}#/ for(int index=0;index<MAX_KEY;index++){
1/YWDxo, if(hCallWnd[index]==0){
=:zmF]j9 hCallWnd[index]=hWnd;
vo[Zuv?<h HotKey[index]=cKey;
^MGgFS]G HotKeyMask[index]=cMask;
{(#>%f+|C bAdded=TRUE;
gI
qYIt KeyCount++;
afcI5w;>} break;
^{GnEqml& }
c?{&=,u2 }
z5v)~+"1 return bAdded;
7N/v }
m]$!wp //删除热键
T^ ^o BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S&% GB {
%klC&
_g~_ BOOL bRemoved=FALSE;
nTweQ for(int index=0;index<MAX_KEY;index++){
#s)Wzv%OX if(hCallWnd[index]==hWnd){
LuB-9[^< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
/,z4tf hCallWnd[index]=NULL;
R*D0A@ HotKey[index]=0;
61q:nWs HotKeyMask[index]=0;
gjJ?*N[ bRemoved=TRUE;
\4`~J@5Y KeyCount--;
u+GtH;<; break;
8=H!&+aGh }
Yqy7__vm }
2Ke?* }
+.T&U7xV return bRemoved;
f YR*B0tu }
((TiBCF4 8C2s-%: jX79Nm| DLL中的钩子函数如下:
`k/hC S$Tc\/{ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,25Qhz] {
T<"Hh.h BOOL bProcessed=FALSE;
xZ }1dq8 if(HC_ACTION==nCode)
vl8Ums} + {
pDO&I]S`q0 if((lParam&0xc0000000)==0xc0000000){// 有键松开
(5] |Kcp| switch(wParam)
jemg#GB8 {
e.%`
tK3J case VK_MENU:
K%ltB& MaskBits&=~ALTBIT;
o[W7'1O break;
vd>X4e^j case VK_CONTROL:
^<#08L; MaskBits&=~CTRLBIT;
_6"!y
]Q break;
FV>LD% uu case VK_SHIFT:
)pV5l|` MaskBits&=~SHIFTBIT;
<)L'h break;
gN|[n.W4 default: //judge the key and send message
f\FubL break;
9pD=E>4?# }
}u0t i"V for(int index=0;index<MAX_KEY;index++){
Bkvh]k;F8 if(hCallWnd[index]==NULL)
qh!2dj continue;
&y/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lV/-jkR {
GU\}}j] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#y }{ 'rF? bProcessed=TRUE;
FOxMt;|M }
[!B($c|\ }
st"uD\L1p: }
{#aW")x^# else if((lParam&0xc000ffff)==1){ //有键按下
)54;YK switch(wParam)
=^m,|j|d>4 {
D/C)Rrq"a case VK_MENU:
oqa]iBO MaskBits|=ALTBIT;
E(F<shT# break;
y#Je%tAe
2 case VK_CONTROL:
r]p
0O( MaskBits|=CTRLBIT;
(a0q*iC% break;
C~IsYdln case VK_SHIFT:
-z9-f\ MaskBits|=SHIFTBIT;
PMzPe"3M break;
;q&6WO default: //judge the key and send message
j]\3>. break;
\M-}(>Pfk }
,"~#s( for(int index=0;index<MAX_KEY;index++){
1@*qz\ YY if(hCallWnd[index]==NULL)
w,fA-*bZ 0 continue;
5|>FM& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pJ Iq`)p5 {
AV\6K;~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
^sR]w]cz. bProcessed=TRUE;
8.4 1EKr2 }
J0@<6~V6o }
d?G~k[C!a }
Ergh]"AD6- if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Y;ytm
#= for(int index=0;index<MAX_KEY;index++){
^a&-GhX; if(hCallWnd[index]==NULL)
#jAlmxN continue;
#flOaRl. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
O(U'G|
SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
ZSCZt&2v //lParam的意义可看MSDN中WM_KEYDOWN部分
I^>m-M. }
II;fBcXF }
/ 4P+ }
Gq_rZo(@ return CallNextHookEx( hHook, nCode, wParam, lParam );
$xRZU9+ }
'|mVY; i[ ))Ws{ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
{[~cQgCI 0F$;]zg BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%$K2$dq5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"LyMw){ 34ij5bko_) 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:
Ve,h]/G +L(0R&C LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
i;4|UeUl {
@Sb 86Ee if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Ig9yd S-. {
*7: )k //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
88\0opL- SaveBmp();
jb~2f2vUa return FALSE;
$2u^z=`b!% }
HP T{83 …… //其它处理及默认处理
i[obQx S94 }
U40adP? a t?JY@hT* bvZTB<rA 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。
KLqn`m`O; 2$8#ePyq* 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
(#6E{@eq 2
MFGKz O 二、编程步骤
*~b3FLzq :2#8\7IU^' 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
MRzrZZ%LQ Q"UWh~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
^6*LuXPv HZ$q`e 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;
;4DqtR"7Y 6- H81y3 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;
|BrD:+ oNV5su 5、 添加代码,编译运行程序。
=Kdd+g! Z]-C,8MM 三、程序代码
NPjh2 AJm #$trC)? ~q ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
_2*Ryz #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
moO=TGG;F #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ZZ 1s}TG #if _MSC_VER > 1000
-&87nR(eW #pragma once
VT.BHZ #endif // _MSC_VER > 1000
Gt{'` P,&9 #ifndef __AFXWIN_H__
mIu- #error include 'stdafx.h' before including this file for PCH
WU oGIT' #endif
\Kh@P*7 #include "resource.h" // main symbols
\@]/ks=K class CHookApp : public CWinApp
9$0-UUCk {
c-S_{~~ public:
joaf0 CHookApp();
yl63VX8w} // Overrides
V,>_L // ClassWizard generated virtual function overrides
nsChNwPX //{{AFX_VIRTUAL(CHookApp)
8ut:cCrmg public:
z0ULB?*" virtual BOOL InitInstance();
u+7B-l=u* virtual int ExitInstance();
YLc 2:9 //}}AFX_VIRTUAL
,/V'(\>
//{{AFX_MSG(CHookApp)
EA )28]Y. // NOTE - the ClassWizard will add and remove member functions here.
_H#l&bL@C // DO NOT EDIT what you see in these blocks of generated code !
J)6A,:wt //}}AFX_MSG
"m^whHj DECLARE_MESSAGE_MAP()
[kc%+j<g };
pPztUz/. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
`_L=~F8 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
6 isz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F_Q,j]0 BOOL InitHotkey();
\L14rQ
t BOOL UnInit();
I"*;fdm #endif
}@Mx@ S (`0dO8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
@d5G\1(% #include "stdafx.h"
dt NHj/\ #include "hook.h"
Iq&S6l <0 #include <windowsx.h>
lLuAZoH #ifdef _DEBUG
IbRy~ #define new DEBUG_NEW
%\=oy=f #undef THIS_FILE
.HTX7mA3 static char THIS_FILE[] = __FILE__;
!ra CpL9; #endif
mPHn &4 #define MAX_KEY 100
%y
zFWDg #define CTRLBIT 0x04
~<0!sE&y #define ALTBIT 0x02
6km{=
``` #define SHIFTBIT 0x01
,}&E=5MF\ #pragma data_seg("shareddata")
'TPRGX~& HHOOK hHook =NULL;
?L|Jc_E UINT nHookCount =0;
+cAN4 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
kqYvd]ss static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
, WF)GS|7V static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
_#c^z;! static int KeyCount =0;
Uk5O9D0
He static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
5- Q`v/w; #pragma data_seg()
H!dUQ HINSTANCE hins;
%9|=\#
G void VerifyWindow();
A@/DGrZX BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}K=TB}yY //{{AFX_MSG_MAP(CHookApp)
J90q\_dY. // NOTE - the ClassWizard will add and remove mapping macros here.
jjgY4<n // DO NOT EDIT what you see in these blocks of generated code!
$q}}w||e~0 //}}AFX_MSG_MAP
?
C2 bA5M END_MESSAGE_MAP()
M,[u}Rf^w T W?O CHookApp::CHookApp()
9E{Bn# {
7pNTCZY| // TODO: add construction code here,
w;$@ </ // Place all significant initialization in InitInstance
S3"js4a }
M%7H-^{ !M~p __ CHookApp theApp;
z"BV+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
rVkoj;[ {
J.x>*3<l BOOL bProcessed=FALSE;
D5X;hd if(HC_ACTION==nCode)
5* 1wQlL {
FAu G`zu if((lParam&0xc0000000)==0xc0000000){// Key up
an3HKfv switch(wParam)
;??wLNdf- {
Mj$dDtw case VK_MENU:
`+b>@2D_ MaskBits&=~ALTBIT;
+j 5u[X break;
&?3?8Q\ case VK_CONTROL:
EmNB}\IYU MaskBits&=~CTRLBIT;
+P6#7.p`Z break;
R<mLG $ case VK_SHIFT:
WfVkewuPo MaskBits&=~SHIFTBIT;
amf=uysr break;
MBCA%3z08 default: //judge the key and send message
mQ#@"9l% break;
3nBbPP_ }
ww"ihUX for(int index=0;index<MAX_KEY;index++){
*qg9~/ if(hCallWnd[index]==NULL)
/qF7^9LtaY continue;
O?@1</r^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{xt<`_R {
yy?|q0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]
K7>R0 bProcessed=TRUE;
?Gl'-tV }
I=hgfo }
s<qSelj }
@u/<^j3Q else if((lParam&0xc000ffff)==1){ //Key down
uqZLlP# switch(wParam)
XzQ=8r>l {
@.kv",[{[ case VK_MENU:
Xj$J}A@ MaskBits|=ALTBIT;
|aN0|O2 break;
fDq,
)~D case VK_CONTROL:
fRT:@lV MaskBits|=CTRLBIT;
bi!4I<E>k break;
SPsq][5eR case VK_SHIFT:
l3}n.ODA MaskBits|=SHIFTBIT;
HH6b{f@^ break;
}eb%"ZH4| default: //judge the key and send message
w0~iGr}P break;
k`js~/Xv }
'xb|5_D for(int index=0;index<MAX_KEY;index++)
VO(Ck\i} {
iyOd&|. if(hCallWnd[index]==NULL)
I(Nsm3L continue;
lGPC)Hu{` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
S^)r,cC {
Wnl8XHPn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
!5`}s9hsF_ bProcessed=TRUE;
h.
i&[RnX }
<Xy8}Z`s }
oAWk<B(@ }
QAi(uL5 if(!bProcessed){
[
H>MeeR for(int index=0;index<MAX_KEY;index++){
|f8by\Q86= if(hCallWnd[index]==NULL)
o;Zoj} continue;
,-CDF)~G=3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
vyV n5s SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fY=iQ?{/[ }
&X+V} }
E yNI]XEj }
Z;S*fS-_ return CallNextHookEx( hHook, nCode, wParam, lParam );
Z/wh?K3y }
p{Pa(Z]G W~k!qy ` BOOL InitHotkey()
dGIu0\J\$ {
<zZAVGb4I if(hHook!=NULL){
CX':nai nHookCount++;
uc Z(D|a return TRUE;
?
z=>n }
=AL95"cH~ else
.ET;wK hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
JIb<>X, if(hHook!=NULL)
![Ip)X
OG nHookCount++;
}C*o;'o5G return (hHook!=NULL);
K-
}k-S }
P+}qaup BOOL UnInit()
q'(WIv@ {
(dMFYL>YP if(nHookCount>1){
-(cm nHookCount--;
#]lUJ
&M}e return TRUE;
8.pz?{**T }
Wlg(z% BOOL unhooked = UnhookWindowsHookEx(hHook);
<Dm6CH if(unhooked==TRUE){
+ {hxEDz nHookCount=0;
pDkT_6Q hHook=NULL;
%\~;I73 }
)lw7W9 return unhooked;
MruWt* }
$+Pv
fQ nNhN:? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z$zUy|s[ {
b V9Z[[\ BOOL bAdded=FALSE;
Ysr{1! K for(int index=0;index<MAX_KEY;index++){
(X!/tw,. if(hCallWnd[index]==0){
p~8~EQFj hCallWnd[index]=hWnd;
X3W)c&Pr HotKey[index]=cKey;
@1]<LQ\\ HotKeyMask[index]=cMask;
+ypG<VBx% bAdded=TRUE;
\=N
tbBL$[ KeyCount++;
SOK2{xCG break;
{6%uNT>| }
>t D-kzN }
ik$wS#1+L return bAdded;
N7oMtlvL[w }
J~_p2TZJ\3 J.<eX=< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
l*v([@A\ {
=rBFMTllM BOOL bRemoved=FALSE;
IN%>46e` for(int index=0;index<MAX_KEY;index++){
}2NH>qvY if(hCallWnd[index]==hWnd){
=fsaJ@q,R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
d:pp,N~2o hCallWnd[index]=NULL;
h.?[1hT4R HotKey[index]=0;
Xx'>5d> HotKeyMask[index]=0;
9d{W/t?NH bRemoved=TRUE;
0H>Fyl2_ KeyCount--;
7_K(xmK break;
^1~/FU }
pM46I" }
N\uQ-XOi }
Vbj?:29A return bRemoved;
PzV(e)~7 }
?ft_ ~zm/n,Epb void VerifyWindow()
&)X<yd0 {
<rC#1wR4 for(int i=0;i<MAX_KEY;i++){
wP8R=T if(hCallWnd
!=NULL){ <`r+l5
if(!IsWindow(hCallWnd)){ KPR{5
hCallWnd=NULL; *z+\yfOO"
HotKey=0; D{loX6
HotKeyMask=0; :mJM=FeJ
KeyCount--; $U8ap4EXM
} j2P|cBXu
} +%<Jr<~W
} ;9I#>u
} v
PGuEfz
I"!gzI`Sd
BOOL CHookApp::InitInstance() OeAPBhTmFj
{ z9+94<J
AFX_MANAGE_STATE(AfxGetStaticModuleState()); D/:)rj14b
hins=AfxGetInstanceHandle(); IL\mFjZ'
InitHotkey(); i&HV8&KygN
return CWinApp::InitInstance(); :_aY:`
} U3V<ITZI8t
_bd#C
int CHookApp::ExitInstance() PR'FSTg
{ ]bR'J\Fwl
VerifyWindow(); ?Tl@e
UnInit(); u]2k %TUY
return CWinApp::ExitInstance(); [.Y=~)7FB
} ho20>vw#
=
]@xXVf/
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m[bu(q z
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V")Q4h{
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F0JFx$AoD
#if _MSC_VER > 1000 ]OrFW4tiE
#pragma once IY19G U9
#endif // _MSC_VER > 1000 Kulg84<AwM
B.G!7>=
class CCaptureDlg : public CDialog f2u2Ns0Ym
{ 7wqwDE
// Construction #NE^f2
public: *Vc=]Z2G^
BOOL bTray; Kje+Niz7
BOOL bRegistered; `o3d@Vc
BOOL RegisterHotkey(); \k,bz0
UCHAR cKey; M/DTD98'N
UCHAR cMask; 9F+bWo_m
void DeleteIcon(); >ahj|pm
void AddIcon(); j41:]6
UINT nCount; z
K(5&u
void SaveBmp(); NN:TT\!v
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;MMFF {
// Dialog Data </=PN1=A
//{{AFX_DATA(CCaptureDlg) c[y8"M5
enum { IDD = IDD_CAPTURE_DIALOG }; 1v4kN
-
CComboBox m_Key; bGJUu#
BOOL m_bControl; 5QSmim
BOOL m_bAlt; 1P[Lz!C
BOOL m_bShift; :kVV.a#g
CString m_Path; LC7LO
CString m_Number; &wuV}S7
//}}AFX_DATA !kcg#+s91
// ClassWizard generated virtual function overrides .'a |St
//{{AFX_VIRTUAL(CCaptureDlg) mr1}e
VM~!
public: y|dXxd9
virtual BOOL PreTranslateMessage(MSG* pMsg); uqUo4z 5T
protected: Z:v1?v
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _UBI,Dg]
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); N 93E;B
//}}AFX_VIRTUAL _tk5?9Ykn
// Implementation vck$@3*
protected: )
G{v>Z,
HICON m_hIcon; 3XnXQ/({
// Generated message map functions UIl_&|
//{{AFX_MSG(CCaptureDlg) TUaK:*x*
virtual BOOL OnInitDialog(); [:QMnJ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }j?S?= ;m=
afx_msg void OnPaint(); r+\z0_'
w6
afx_msg HCURSOR OnQueryDragIcon(); gJ&!w8v.
virtual void OnCancel(); zK 2wLX
afx_msg void OnAbout(); tTt3D]h(
afx_msg void OnBrowse(); ]#$kA9
afx_msg void OnChange(); bIArAS9%
//}}AFX_MSG 8w&rj-
DECLARE_MESSAGE_MAP() lnDDFsA
}; s=TjM?)
#endif 4I-p/&Q
//Gvk|O1
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O i0;.<kX
#include "stdafx.h" JY2
F-0t)
#include "Capture.h" j''Iai_
#include "CaptureDlg.h" aAri
#include <windowsx.h> "Y!dn|3
#pragma comment(lib,"hook.lib") 4l''/$P
#ifdef _DEBUG
YBD {l
#define new DEBUG_NEW -W_s]oBg
#undef THIS_FILE .Y|\7%(
static char THIS_FILE[] = __FILE__; V,+[XB
#endif tFaE cP
#define IDM_SHELL WM_USER+1 .( h$@|Y
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {^W,e ^:
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \.c
)^QQ
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Hg`{9v
class CAboutDlg : public CDialog mM}Ukmy
{ !XG&=Rd?
public: pxxFm~"d
CAboutDlg(); 'pY;]^M
// Dialog Data O ->eg
//{{AFX_DATA(CAboutDlg) fmJW d|
enum { IDD = IDD_ABOUTBOX }; QYgN39gp
//}}AFX_DATA mi<D
bnou
// ClassWizard generated virtual function overrides \+3Wd$I
//{{AFX_VIRTUAL(CAboutDlg) -o_TC
protected: #/Fu*0/)`
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wYA/<0'yH
//}}AFX_VIRTUAL X|`,AKJit
// Implementation "Y]ZPFh#.
protected: EQ7n'Wqq
//{{AFX_MSG(CAboutDlg) ;_/q>DR>,3
//}}AFX_MSG 8 %j{4$
DECLARE_MESSAGE_MAP() C94@YWs
}; ;p
5v3<PC
51
0XDl~b
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -FN6sNvIh
{ [
5W#1 &
//{{AFX_DATA_INIT(CAboutDlg) 9r nk\`E
//}}AFX_DATA_INIT em[F|
} -1
L"h@`3o|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) h.$__Gs
{ U%DF!~n
CDialog::DoDataExchange(pDX); Bh,)5E^m
//{{AFX_DATA_MAP(CAboutDlg) kc'0NE4oq
//}}AFX_DATA_MAP %Z[/U
} \TB%N1^
5^K#Tj ;2
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) fq'Xy9L
//{{AFX_MSG_MAP(CAboutDlg) A dEbyL
// No message handlers @JEmybu
//}}AFX_MSG_MAP 'UVv(-
END_MESSAGE_MAP() @CU|3Qg
4spaw?j
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) =)- Q?1q
: CDialog(CCaptureDlg::IDD, pParent) $O e 58
{ %s2"W~
//{{AFX_DATA_INIT(CCaptureDlg) ;Uqx&5P}
m_bControl = FALSE; "qTC(F9N$.
m_bAlt = FALSE; X$ B]P7G7
m_bShift = FALSE; k!/_/^{
m_Path = _T("c:\\"); 1Bk*G>CX9(
m_Number = _T("0 picture captured."); @zynqh
nCount=0; a\69,%!:
bRegistered=FALSE; kbYg4t]FH
bTray=FALSE; L-C/Luws
//}}AFX_DATA_INIT U`9\P2D`/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 GHJ=-9{YL
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <
mK
} '?G[T28
!)/iRw9re
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "YzTMKu
{ oT)VOkFq
CDialog::DoDataExchange(pDX); ^q&wITGI
//{{AFX_DATA_MAP(CCaptureDlg) )fMX!#KP
DDX_Control(pDX, IDC_KEY, m_Key); \U*-w:+@
DDX_Check(pDX, IDC_CONTROL, m_bControl); V2s}<uG
DDX_Check(pDX, IDC_ALT, m_bAlt); 2v9s@k/k)6
DDX_Check(pDX, IDC_SHIFT, m_bShift); $',GkK{NX
DDX_Text(pDX, IDC_PATH, m_Path); R;E"Qdt
DDX_Text(pDX, IDC_NUMBER, m_Number); g<iwxF
//}}AFX_DATA_MAP R_Gq8t$
} !+A"Lej
^?X ^+
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S`c]Fc
//{{AFX_MSG_MAP(CCaptureDlg) {#*? S>DA
ON_WM_SYSCOMMAND() "26B4*
ON_WM_PAINT() CoUd16*"JM
ON_WM_QUERYDRAGICON() @CaD8%j{
ON_BN_CLICKED(ID_ABOUT, OnAbout) B~ !G lT
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oA;jy
ON_BN_CLICKED(ID_CHANGE, OnChange) H@2v<e@
//}}AFX_MSG_MAP V1`5D7Z
END_MESSAGE_MAP() P"=UI$HN
Jh&~/ntmm_
BOOL CCaptureDlg::OnInitDialog() L_~I~
{ e}R2J`7
CDialog::OnInitDialog(); loC5o|Wh
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7c29Ua~[
ASSERT(IDM_ABOUTBOX < 0xF000); _.OMjUBZT
CMenu* pSysMenu = GetSystemMenu(FALSE); f1Yv hvWL
if (pSysMenu != NULL) 1V**QSZ1
{ /SCZ&
CString strAboutMenu; tT* W5
strAboutMenu.LoadString(IDS_ABOUTBOX); YZBzv2'\x
if (!strAboutMenu.IsEmpty()) qsft*&
{ ^EUOmVN
pSysMenu->AppendMenu(MF_SEPARATOR); LN.Bd,
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *K}z@a_
} :nKsZ1b X
} d7gH3 l
SetIcon(m_hIcon, TRUE); // Set big icon 5S\][;u
SetIcon(m_hIcon, FALSE); // Set small icon g^z5fFLg/8
m_Key.SetCurSel(0); Tw}?(\ya
RegisterHotkey(); D0#T-B\#
CMenu* pMenu=GetSystemMenu(FALSE); @7Rt4}g
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); vzyN c'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); urT/+deR
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (pE\nuA\
return TRUE; // return TRUE unless you set the focus to a control 7TV>6i+7
} v#:+n+y\z
J\xz^%p
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Krp
<bK6
{ Zr.\`mG4f
if ((nID & 0xFFF0) == IDM_ABOUTBOX) &N/|(<CB
{ C`2*2Y%xkG
CAboutDlg dlgAbout; IYfV~+P
dlgAbout.DoModal(); $_ix6z
} B_."?*|w
else BP[CR1Gs
{ +Mk*{A t
CDialog::OnSysCommand(nID, lParam); sd]54&3A
} 3^02fy
} FI?gT
%Ye)8+-
void CCaptureDlg::OnPaint() b:F Ep'ZS
{ ot@|blVC8
if (IsIconic()) 3@PUg(M
{ +p9LE4g7Q
CPaintDC dc(this); // device context for painting U^[cYTG
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lruF96C/Y
// Center icon in client rectangle VQy9Y
int cxIcon = GetSystemMetrics(SM_CXICON); M.xhVgFf)
int cyIcon = GetSystemMetrics(SM_CYICON); Hi; K"H]x1
CRect rect; OX)#F'Sl}
GetClientRect(&rect); N+\oFbE
int x = (rect.Width() - cxIcon + 1) / 2; `7QvwXsH]
int y = (rect.Height() - cyIcon + 1) / 2; u [V4OU}%
// Draw the icon fqcU5l[v,
dc.DrawIcon(x, y, m_hIcon); !paN`Fz\a
} .N5hV3
else s6uF5]M;2
{ )|U_Z"0H^
CDialog::OnPaint(); cy=I0
} 7oZ@<QP'
} nd $H
3sf
|~@x4J5,
HCURSOR CCaptureDlg::OnQueryDragIcon() --in+
{ C2+{U
return (HCURSOR) m_hIcon; MB]#%g&
} ~/j$TT"
4ss&'h
void CCaptureDlg::OnCancel() &Pu+(~'Q
{ b$dJ?%W
if(bTray) Ne &Xf
DeleteIcon(); o,?!"*EP
CDialog::OnCancel(); uSABh^
} BW'L.*2
wXr>p)mP
void CCaptureDlg::OnAbout() aL8p"iSG9
{ zyaW3th
CAboutDlg dlg; /hm84La
dlg.DoModal(); u:_sTfKm&
} 2wB.S_4"-<
Mam8\
void CCaptureDlg::OnBrowse()
OD
{ vC{h2A
CString str; \ V[;t-
BROWSEINFO bi; t2=a(N-/,
char name[MAX_PATH]; p//T7rs
ZeroMemory(&bi,sizeof(BROWSEINFO)); a$ C2}
bi.hwndOwner=GetSafeHwnd(); Ho|o,XvLv
bi.pszDisplayName=name; hMNJ'i}
bi.lpszTitle="Select folder"; Wyy^gJl
bi.ulFlags=BIF_RETURNONLYFSDIRS; y=[gQJ6~r
LPITEMIDLIST idl=SHBrowseForFolder(&bi); lq:]`l,6@
if(idl==NULL) Sp 7u_Pq{
return; c:=7lI
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `%$8cZ-kr
str.ReleaseBuffer(); 8h*t55
m_Path=str; `+roQX.p
if(str.GetAt(str.GetLength()-1)!='\\') ~'NX~<m
m_Path+="\\"; yOX&cZ[
UpdateData(FALSE); %9t{Z1$
} {I4%
@)o0GHNP
void CCaptureDlg::SaveBmp() rpUy$qrRc
{ j_!bT!8
CDC dc; }TSgAwsbC
dc.CreateDC("DISPLAY",NULL,NULL,NULL); MVeFe\r
CBitmap bm; F(d:t!
int Width=GetSystemMetrics(SM_CXSCREEN); PXV)NC
int Height=GetSystemMetrics(SM_CYSCREEN); ETM2p1ru0
bm.CreateCompatibleBitmap(&dc,Width,Height); K@q&HV"'.
CDC tdc; qOW#Q:T
tdc.CreateCompatibleDC(&dc); t:\l&R&
CBitmap*pOld=tdc.SelectObject(&bm); ~V @;(_T
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X6Un;UL
tdc.SelectObject(pOld); p`d
XqW
BITMAP btm; 2Oyy`k
bm.GetBitmap(&btm); z<a$q3!#
DWORD size=btm.bmWidthBytes*btm.bmHeight; I`22Zwq:
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T36x=LX
BITMAPINFOHEADER bih; 8QT<M]N%
bih.biBitCount=btm.bmBitsPixel; St6aYK
bih.biClrImportant=0; C`dkD0_
bih.biClrUsed=0; gXLCRn!iR
bih.biCompression=0; @zo7.'7P
bih.biHeight=btm.bmHeight; (@+h5@J[`I
bih.biPlanes=1; 1hR
(N
bih.biSize=sizeof(BITMAPINFOHEADER); OFL|RLiD
bih.biSizeImage=size; -^yXLa;D
bih.biWidth=btm.bmWidth; kB8
M i
bih.biXPelsPerMeter=0; N*Yy&[
bih.biYPelsPerMeter=0; 2R~6<W+&:>
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ndr)3tuYu
static int filecount=0; W$r^
CString name; @c Z\*,T
name.Format("pict%04d.bmp",filecount++); fb23J|"
name=m_Path+name; t\zbEN
BITMAPFILEHEADER bfh; u+m4!`
bfh.bfReserved1=bfh.bfReserved2=0; md?b*
bfh.bfType=((WORD)('M'<< 8)|'B'); Z(p*Z,?u
bfh.bfSize=54+size; {|z#70
bfh.bfOffBits=54; ?{eY\I
CFile bf; cQX:%Ix=
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )u0O_R
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {&-#s#&
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); YJd8l>mz
bf.WriteHuge(lpData,size); f27)v(EJ
bf.Close(); k=?^){[We
nCount++; Jn=42Q:>
} mwIk^Sz]@
GlobalFreePtr(lpData); TtPr)F|
if(nCount==1) #:#Dz.$L
m_Number.Format("%d picture captured.",nCount); 6a*83G,k
else RwW$O@0
m_Number.Format("%d pictures captured.",nCount); J@QdieW6
UpdateData(FALSE); vs+QbI6>-
} -j&Vtr
.Rvf/-e
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }S */b1
{ @TysXx
if(pMsg -> message == WM_KEYDOWN) W .U+.hR
{ T^]7R4Fg
if(pMsg -> wParam == VK_ESCAPE) /YFa
;2 W
return TRUE; Q/py qe G
if(pMsg -> wParam == VK_RETURN) qEQAn/&
return TRUE; b,Ke>.m
} Nt~x&s
return CDialog::PreTranslateMessage(pMsg); MGQ,\55"
} +< yhcSSTB
Wwhgo.Wx
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G6V/S aD
{ V.8%|-d
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vM(Xip7
SaveBmp(); 3rNc1\a;
return FALSE; T`\]!>eb
} L+.H z&*@
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M\9F:.t=
CMenu pop; cvfUyp;P
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); IE;\7r+h
CMenu*pMenu=pop.GetSubMenu(0); Qs l80~n_7
pMenu->SetDefaultItem(ID_EXITICON); |n`PESf_
CPoint pt; 8}BS2C%P
GetCursorPos(&pt); 2bLI%gg3
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZVL
gK}s
if(id==ID_EXITICON) >aG= T{
DeleteIcon(); +AoP{x$Ia
else if(id==ID_EXIT) U;U08/y
OnCancel(); g*y/j]
return FALSE; z]=8eV\
} v L}T~_=3
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tuLH}tkNY
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u1^\MVO8
AddIcon(); ]JdJe6`Mc
return res; ,?(ciO)
} `\N]wlB2/b
Jf_%<\ O
void CCaptureDlg::AddIcon() <bUXC@3W
{ ?Vc0)
NOTIFYICONDATA data; VI_+v[Hk/
data.cbSize=sizeof(NOTIFYICONDATA); ]
8Tzr
CString tip; 6+3 $:?
tip.LoadString(IDS_ICONTIP); jj,r <T
data.hIcon=GetIcon(0); l5k?De_(x
data.hWnd=GetSafeHwnd(); ORBxD"J&
strcpy(data.szTip,tip); : @6mFTV
data.uCallbackMessage=IDM_SHELL; ,h&a9:+i
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f*m[|0qI<X
data.uID=98; R0wf#%97
Shell_NotifyIcon(NIM_ADD,&data); aQUGNa0+d
ShowWindow(SW_HIDE); pOA!#Aj)
bTray=TRUE; BpH%STEN
} VEs5;]#<2D
G\=_e8(
void CCaptureDlg::DeleteIcon() Kkv<"^H
{ g^l RG3a
NOTIFYICONDATA data; Ur!~<4GO
data.cbSize=sizeof(NOTIFYICONDATA); eT[&L @l]b
data.hWnd=GetSafeHwnd(); %>zjGF<
data.uID=98; m Ni2b*k
Shell_NotifyIcon(NIM_DELETE,&data); 2*2:-ocl$
ShowWindow(SW_SHOW); z%sy$^v@vD
SetForegroundWindow(); I[D8""U
ShowWindow(SW_SHOWNORMAL); M0w/wt|
bTray=FALSE; {C")#m-0
} rN5tI.iC
q3h'l,
void CCaptureDlg::OnChange() 4 1t)(+r
{ ;>>C)c4V "
RegisterHotkey(); 9v?l
} "9XfQ"P
Ew$I\j*
BOOL CCaptureDlg::RegisterHotkey() mgQIhXH5L
{ vzXag*0
UpdateData(); YGk9b+`
UCHAR mask=0; %8r/oS
UCHAR key=0; hXB|g[zT
if(m_bControl) .L EY=j!-s
mask|=4; 6F|j(LB
if(m_bAlt) y1pu R7
mask|=2; .=c<>/
0
if(m_bShift) <9eu1^g
mask|=1; zT#`qCbT'J
key=Key_Table[m_Key.GetCurSel()]; :]WqfR)#
if(bRegistered){ Zu/<NC
(
DeleteHotkey(GetSafeHwnd(),cKey,cMask); \/5RL@X}
bRegistered=FALSE; f.6~x$:)`E
} %j+xgX/&
cMask=mask; :P+\p=
cKey=key; f p[,C1U
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,6,]#R
:J
return bRegistered; m3.sVI0I
} Q(Gl{#b
nwmW.(R4
四、小结 GF$`BGW
x#H
3=YD*
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。