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:
cW B>
dz
fR ^Gv 一、实现方法
f8`K8Y]4 ,at"Q$)T 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<
UuVu K_/8MLJQ #pragma data_seg("shareddata")
$qkVu HHOOK hHook =NULL; //钩子句柄
s%h|>l[lKT UINT nHookCount =0; //挂接的程序数目
0r?975@A static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Oo'IeXQ9( static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
zbH Nj(~ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
q)%F#g static int KeyCount =0;
"Y(stRa static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
j^ L"l;m #pragma data_seg()
MhMY"bx8 _@I8B 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
C
Z8Fe$F ([~9v@+ 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:
#<ppiu$ *Ag</g@ h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
j)4:*R.Z] cKey,UCHAR cMask)
j8p</gd {
nn>1OO BOOL bAdded=FALSE;
""cnZZ5) for(int index=0;index<MAX_KEY;index++){
+a$'<GvP if(hCallWnd[index]==0){
#/fh_S'Z hCallWnd[index]=hWnd;
O~t]:p9_ HotKey[index]=cKey;
`.3! HotKeyMask[index]=cMask;
kO:|?}Koc bAdded=TRUE;
d-e6hI4b KeyCount++;
Yud]s~N break;
, 'WhF- }
w,hl<=:(FB }
^mWOQ*zi; return bAdded;
/Qh }
C9^[A4O@X! //删除热键
b~;gj^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[RtTi<F^ {
h2kba6rwk BOOL bRemoved=FALSE;
ovv<7` for(int index=0;index<MAX_KEY;index++){
hLYy if(hCallWnd[index]==hWnd){
[?rK9I& if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
GT$.#};u hCallWnd[index]=NULL;
#CKPNk
c HotKey[index]=0;
s Xyc _3N HotKeyMask[index]=0;
}Ruj h4* bRemoved=TRUE;
z~[:@mGl KeyCount--;
4 .7YIM break;
m80e^ }
e>yPFXSk }
Y~ j.Kt }
7!%/vO0m return bRemoved;
E'3=qTbiD }
*v1M^grKd 2aQR#lcv B|%(0j8 DLL中的钩子函数如下:
j8k5B" L?~>eT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
12
y=Eh {
Dq=&K,5; BOOL bProcessed=FALSE;
bI~ R6o if(HC_ACTION==nCode)
t%@sz {
a=(D`lQ8 if((lParam&0xc0000000)==0xc0000000){// 有键松开
@qP
uYFnw switch(wParam)
P2y`d9,Q {
Yj%hgb:) case VK_MENU:
DK' ? ' MaskBits&=~ALTBIT;
?:@13wm break;
|wF_CZ*1 case VK_CONTROL:
#2*l"3.$.R MaskBits&=~CTRLBIT;
P2HR4`c break;
CPJ8G}4 case VK_SHIFT:
9a\H+Y~ MaskBits&=~SHIFTBIT;
Ziclw) break;
Swugt"`nN default: //judge the key and send message
f
uzz3# break;
m]C|8b7Y }
OIi8x?
.~] for(int index=0;index<MAX_KEY;index++){
6T-h("t if(hCallWnd[index]==NULL)
X`/3X}<$7 continue;
|. w'Z7(s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_+c' z {
gcS?r : SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x`7Ch3`4} bProcessed=TRUE;
|tK_Bn }
r~mZ?dI }
t:MeSO }
R/!lDv!
else if((lParam&0xc000ffff)==1){ //有键按下
/j7e
q switch(wParam)
&j}08aK% {
hw2'.}B"( case VK_MENU:
#vwK6'z MaskBits|=ALTBIT;
-cDS+*[ break;
?vA)F)MS case VK_CONTROL:
.h({ P#QT MaskBits|=CTRLBIT;
9jwcO)p^ break;
Ej_ >*^b case VK_SHIFT:
G6W_)YL MaskBits|=SHIFTBIT;
irjOGn break;
Z;=h= default: //judge the key and send message
!H)$_d \uj break;
|nOqy&B }
E[Xqyp!< for(int index=0;index<MAX_KEY;index++){
0.pZlv if(hCallWnd[index]==NULL)
SB1j$6]OR7 continue;
o!6~tO=% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
j-~x==c-; {
@`Fv}RY{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>(E C.ke bProcessed=TRUE;
ko-3`hX` }
Za[?CA }
0o2*X|i( }
n>t&l8g%g if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ni2GZ<1j for(int index=0;index<MAX_KEY;index++){
q fc:%ks2 if(hCallWnd[index]==NULL)
ye<b`bL2. continue;
GtuA94=!V& if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
`!Z0;qk SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%rFR:w`{ //lParam的意义可看MSDN中WM_KEYDOWN部分
x3>ZO.Q }
lw\+!}8( }
/Dd.C<F }
W8blHw" return CallNextHookEx( hHook, nCode, wParam, lParam );
`}r)0,Z}3 }
L/J1; 5taR[ukM 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:
%*}h{n MQc<AfW3/ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N_:H kI6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
bA_/6r)u HbI'n,+ 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:
7`s*
{ -1_WE/Ps LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
O'Mo/
u1- {
n%faD if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Fe[)-_%G {
h6CAd-\x\ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
%`EyG SaveBmp();
GyC/39<P return FALSE;
F_U9;*f] }
IZ/PZ"n_( …… //其它处理及默认处理
Gye84C2E= }
I`~Giz7@ ^ABtg# >^=;b5I2K 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。
]8n*f o2# .B+Bl/ 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。
(jyT9'*wAT zAW+!C. 二、编程步骤
L[s`8u<_)z XnwVK 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";
[S~/lm $+k|\+iJ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
z|F38(%JJN Af"p:;^z 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
v~*Co}0OB ~xa yGk 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
70GwTK.{~ =.`:jZG 5、 添加代码,编译运行程序。
U#iGR5&^3 &ir|2"HV 三、程序代码
+`J~c|( P5JE = &M ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
bJ"}-s+Dx #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
I!?)}d #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
q90
~)n? #if _MSC_VER > 1000
e**<et. #pragma once
*g*~+B
: #endif // _MSC_VER > 1000
\y(ZeNs #ifndef __AFXWIN_H__
FUP0X2P #error include 'stdafx.h' before including this file for PCH
*@VS^JB #endif
S.zY0 #include "resource.h" // main symbols
@tX8M[.eA class CHookApp : public CWinApp
DL*&e|:q {
3v91 yMx public:
.rwa=IW CHookApp();
>vR7l&" // Overrides
34
'[O // ClassWizard generated virtual function overrides
MpVZL29) //{{AFX_VIRTUAL(CHookApp)
b$eN]L public:
43}uW,P virtual BOOL InitInstance();
[Ot<8)Jm virtual int ExitInstance();
&s(mbpV //}}AFX_VIRTUAL
h ^.jK2I //{{AFX_MSG(CHookApp)
O[|_~v:^ // NOTE - the ClassWizard will add and remove member functions here.
j0b>n#e7 // DO NOT EDIT what you see in these blocks of generated code !
_ea|E 8 //}}AFX_MSG
wX4gyr DECLARE_MESSAGE_MAP()
+h)1NX;o1 };
/u&7!>, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
0;L.h|R T( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
${ 5E BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)GKY#O09x9 BOOL InitHotkey();
M9QYYo@ BOOL UnInit();
pkE4"M!3= #endif
B/_~j_n$m
9+
A~( //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
AZE #include "stdafx.h"
DC~ 1}|B" #include "hook.h"
T8BewO=} #include <windowsx.h>
5^97#;Q;J" #ifdef _DEBUG
,_UTeW6M #define new DEBUG_NEW
c :2 w(BVi #undef THIS_FILE
":_~(?1+ static char THIS_FILE[] = __FILE__;
!{?<(6;t #endif
+,_%9v?3 #define MAX_KEY 100
K,o&gY #define CTRLBIT 0x04
7.*Mmx~]= #define ALTBIT 0x02
&u4;A[-R #define SHIFTBIT 0x01
#=T^XHjQ #pragma data_seg("shareddata")
#0f6X,3 HHOOK hHook =NULL;
2xBYJoF( UINT nHookCount =0;
U;=1v:~d static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
<2e[; $ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
p4@0[z' static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
g_JSgH!4 static int KeyCount =0;
Ie[DTy static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[7\x(W-:@> #pragma data_seg()
2BO&OX|X HINSTANCE hins;
vawS5b; void VerifyWindow();
Yw6uh4 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
h-]c //{{AFX_MSG_MAP(CHookApp)
R:`)*=rL% // NOTE - the ClassWizard will add and remove mapping macros here.
i~LY // DO NOT EDIT what you see in these blocks of generated code!
$=5kn>[_Z% //}}AFX_MSG_MAP
e0M'\'J END_MESSAGE_MAP()
`|<? sjY d5"rCd[ CHookApp::CHookApp()
MJA;P7g {
25;(`Td5 // TODO: add construction code here,
**.g^Pyc // Place all significant initialization in InitInstance
AHU=`z }
.JBTU>1]_n *LEI@ CHookApp theApp;
t[ZGY,8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
y" |gC!V} {
C[,&Y&`j BOOL bProcessed=FALSE;
O Cnra if(HC_ACTION==nCode)
UZ1Au;(| {
-'
=?Hs. if((lParam&0xc0000000)==0xc0000000){// Key up
>uxAti\ switch(wParam)
3i#'osq {
!ou;yE&<, case VK_MENU:
tC5>K9Ed MaskBits&=~ALTBIT;
m7u" awM^ break;
yUN>mD- case VK_CONTROL:
Y[s}?Xu]w# MaskBits&=~CTRLBIT;
s`|KT&r break;
$|N\(}R case VK_SHIFT:
? ph>:M MaskBits&=~SHIFTBIT;
ovZ!} break;
)|GYxG;8C default: //judge the key and send message
m86ztP) break;
F#~*j }
8v)iOPmDC for(int index=0;index<MAX_KEY;index++){
7#7AK} if(hCallWnd[index]==NULL)
}1 j' continue;
=&)R2pLs* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7M~/[f7Z{ {
%Iiu#- 'B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
buDz]ec
b bProcessed=TRUE;
X6j:TF }
J(SGa Hm@ }
* ).YU[i }
TPYh<p# else if((lParam&0xc000ffff)==1){ //Key down
?KWo1 switch(wParam)
_Nh`-R%B) {
iqFC~].) case VK_MENU:
^I{/j'b& MaskBits|=ALTBIT;
X%T%N;P break;
{$V2L4 case VK_CONTROL:
R+El/ya:6 MaskBits|=CTRLBIT;
[{:
l? break;
*;F:6p4_ case VK_SHIFT:
Yq'D-$@ MaskBits|=SHIFTBIT;
<O.|pJus break;
+$F,!rV-s default: //judge the key and send message
%a]Imsm break;
>qPP_^] }
(mioKO )?v for(int index=0;index<MAX_KEY;index++)
/iL*) {
TiR00#b if(hCallWnd[index]==NULL)
. I."q continue;
j9X|c7| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O
Q$C#:? {
i.^:xZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
&UNQ4-s bProcessed=TRUE;
&A=c[pc }
$Tal. }
\uO^wJ} }
fYW9Zbov- if(!bProcessed){
&Mz]y?k' for(int index=0;index<MAX_KEY;index++){
AY;[v.Ff4 if(hCallWnd[index]==NULL)
R:rols"QM continue;
s~ou$!| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;/H/Gn+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
rs,'vV-2\ }
hZw8*H^tP }
}Syd*%BR[ }
IZGRQmi" return CallNextHookEx( hHook, nCode, wParam, lParam );
//RD$e?h~ }
qFl|q0\ A 7-0j8$` BOOL InitHotkey()
g+7j?vC{' {
y;(G%s1 if(hHook!=NULL){
P#V}l'j(<a nHookCount++;
lPrAx0m13% return TRUE;
]]e>Jym }
+N'&6z0Wf else
Z:^ S-h hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
2H`>Kj if(hHook!=NULL)
3d,:,f|h nHookCount++;
#hk5z;J5 return (hHook!=NULL);
Q3Y(K\ }
FlUO3rc| BOOL UnInit()
m/;fY>}3 {
K=r~+4F if(nHookCount>1){
drvrj~o: nHookCount--;
m4yWhUi(o return TRUE;
x0K#- }
HKIr? BOOL unhooked = UnhookWindowsHookEx(hHook);
Q#*R({)GH if(unhooked==TRUE){
Z>l<.T"t' nHookCount=0;
FGhnK' hHook=NULL;
3sW!ya-VZ }
bnPhhsR return unhooked;
"{trK?-8% }
18p4]:L Wc,`L$Jx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:DeJnE {
eNO[ikm BOOL bAdded=FALSE;
+1@'2w{ for(int index=0;index<MAX_KEY;index++){
;.b^&h if(hCallWnd[index]==0){
&aa3BgxyE hCallWnd[index]=hWnd;
OJh MM- HotKey[index]=cKey;
)."dqq^ q HotKeyMask[index]=cMask;
~)zxIO! bAdded=TRUE;
r8!pk~R5] KeyCount++;
hc|#JS2H@y break;
fn.;C }
~N7;.
3 7 }
AX{7].)F return bAdded;
U9*< dR }
z`NJelcuz\ Z3=N= xY] BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V-E 77u6{0 {
S<-5<Pg BOOL bRemoved=FALSE;
9}L2$^#,NA for(int index=0;index<MAX_KEY;index++){
3}fhU{-c if(hCallWnd[index]==hWnd){
G}LV"0? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
b|;h$otC hCallWnd[index]=NULL;
NqveL<r` HotKey[index]=0;
e}P@7e h HotKeyMask[index]=0;
A;*< bRemoved=TRUE;
~Nf|,{[(5 KeyCount--;
Mz+vT0 break;
)vpYVr- }
>>"@0tO }
l2YA/9. }
,?HM5c{'[Y return bRemoved;
) jt?X} }
0c8_& TP~1-(M)} void VerifyWindow()
xE$lx:C"FU {
K-K>'T9F} for(int i=0;i<MAX_KEY;i++){
Jr= fc*f if(hCallWnd
!=NULL){ [LUqF?K&
if(!IsWindow(hCallWnd)){ T LF'7ufq
hCallWnd=NULL; Le{.B@2-"
HotKey=0; Q04
`+Vr
HotKeyMask=0; a.RYRq4o
KeyCount--; &49WfctT
} $DtUTh3)
} z@V9%xF-3
} t* p%!xsH
} /Ahh6=qQY
A)Rh
Bi
BOOL CHookApp::InitInstance() HgBu:x?&
{ SqdI($F\:
AFX_MANAGE_STATE(AfxGetStaticModuleState()); -M_>]ubG
hins=AfxGetInstanceHandle(); xI/8[JW*
InitHotkey(); z.?slYe[
return CWinApp::InitInstance(); OVc)PMp
} 2-Wy@\
>oaL -01i
int CHookApp::ExitInstance() o^MoU2c
{ ZU;jz[}
VerifyWindow(); F6b;qb6n
UnInit(); }qWB=,8HQ
return CWinApp::ExitInstance();
Qw
}1mRv
} Z",2db
DsD? &:
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F%af05L[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rkR~%U6V
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5tzO=gO[
#if _MSC_VER > 1000 <`NsX
6t
#pragma once 5hDy62PRr
#endif // _MSC_VER > 1000 [N}QCy
<"xqt7f
class CCaptureDlg : public CDialog GCX?W`
{ %DA`.Z9#
// Construction 9sd}Z,l
public: l4(FM}0X5}
BOOL bTray; &-X51O C
BOOL bRegistered; 8V9OMOt!
BOOL RegisterHotkey(); =dQ/^C_hj
UCHAR cKey; ^tI&5S]nE
UCHAR cMask; ;DVg[#
void DeleteIcon(); :^xNHMp!
void AddIcon(); N:S2X+}(
UINT nCount; $|TLt{ K
void SaveBmp(); 6Z2|j~
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9_e_Ne`i`?
// Dialog Data 3(vm'r&5n>
//{{AFX_DATA(CCaptureDlg) ='_3qn.
enum { IDD = IDD_CAPTURE_DIALOG }; i\gt
@
CComboBox m_Key; 79-50}A
BOOL m_bControl; x;-D}#
BOOL m_bAlt; }UQ,B
BOOL m_bShift; @LDs$"f9=
CString m_Path; " vc4QH$
CString m_Number; SBf=d<j 1)
//}}AFX_DATA }gB^C3b6
// ClassWizard generated virtual function overrides ;ceg:-Zqo
//{{AFX_VIRTUAL(CCaptureDlg) l~Ka(*[!U
public: O=lRI)6w@e
virtual BOOL PreTranslateMessage(MSG* pMsg); u47`&\
protected: ,8d&uR}x
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 64`l?F
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |"9vq<`
//}}AFX_VIRTUAL i~R+g3oi
// Implementation p~""1m01,D
protected: Sm?|,C3V
HICON m_hIcon; qPWf=s7!
// Generated message map functions jp@X,HES
//{{AFX_MSG(CCaptureDlg) rc~)%M<[2
virtual BOOL OnInitDialog(); ^N
4Y*NtV7
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g)D@4RM
afx_msg void OnPaint(); [z+YXs!N
afx_msg HCURSOR OnQueryDragIcon(); ^tWSu?9
virtual void OnCancel(); 6d2eWS
afx_msg void OnAbout(); ; C(5lD&\5
afx_msg void OnBrowse(); i[{*(Y$L
afx_msg void OnChange(); >;%QW
//}}AFX_MSG %L7DC`
DECLARE_MESSAGE_MAP() SW+;%+`
}; \Y!=O=za]
#endif Q)qJ6-R|HD
DIWyv-
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,j\uvi(Y
#include "stdafx.h" O,
:|
#include "Capture.h" 8*&73cp
#include "CaptureDlg.h" Gm=&[?}
#include <windowsx.h> l @@pXg3
#pragma comment(lib,"hook.lib") ^P/OHuDL
#ifdef _DEBUG w}t}Sh
#define new DEBUG_NEW G\,B*$3
#undef THIS_FILE h4MBw=Tz~
static char THIS_FILE[] = __FILE__; 0Js5 '
9}H
#endif rg]b$tL~
#define IDM_SHELL WM_USER+1 &jQqlQ j
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a|[f%T<<
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5J&Gc;[p
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qe(C>qjMbG
class CAboutDlg : public CDialog XFl&(I4tB
{ :?m"kh
~
public: C=U4z|Ym
CAboutDlg(); A&%7Z^Pp
// Dialog Data SkVah:cF-
//{{AFX_DATA(CAboutDlg) DB_oRr[oj
enum { IDD = IDD_ABOUTBOX }; (b&Z\?"
//}}AFX_DATA W[]|Uu/%
// ClassWizard generated virtual function overrides ,HmGp
//{{AFX_VIRTUAL(CAboutDlg) ^^tTA^
protected: .pm%qEh
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OT6Te&
//}}AFX_VIRTUAL W_Y56@7e
// Implementation $vYy19z
protected: a>,_o(]cW
//{{AFX_MSG(CAboutDlg) KM"?l<x0Y
//}}AFX_MSG 7!m<d,]N
DECLARE_MESSAGE_MAP() '"rm66
}; 5nceOG8
Nlwt}7
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Z("N
*`VP;
{ \_(0V"
//{{AFX_DATA_INIT(CAboutDlg) qNrLM!Rj
//}}AFX_DATA_INIT Fl{~#]
} xy$aFPH!-
a\Gd;C ^`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Nl%5OBm
{ Ukf:m&G
CDialog::DoDataExchange(pDX); 0JR)-*
//{{AFX_DATA_MAP(CAboutDlg) CtD<%v3`
//}}AFX_DATA_MAP ?A r}QN
} j>
dZ26 >N
yT7{,Z7t
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,pf\g[tz
//{{AFX_MSG_MAP(CAboutDlg) h<PS<
// No message handlers 85] 'I%gT
//}}AFX_MSG_MAP h4Arg~Or
END_MESSAGE_MAP() `022gHYv
6U%d3"T
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1 <lfo^B
: CDialog(CCaptureDlg::IDD, pParent) 2\+N<-(F5
{ '@\[U0?@K
//{{AFX_DATA_INIT(CCaptureDlg) $M4_"!
m_bControl = FALSE; w+5OI9
m_bAlt = FALSE; iXXaB+w
m_bShift = FALSE; Xqew~R^MP
m_Path = _T("c:\\"); jO*H8XO
m_Number = _T("0 picture captured."); Qx!Bf_,J
nCount=0; Y( EF )::
bRegistered=FALSE; w(
@QRd{
bTray=FALSE; N}{V*H^0QU
//}}AFX_DATA_INIT T<yfpUzX
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~G6xk/+n-m
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /6n"$qon6
} @$$J}~{
gf4Hq&Rf
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8(S|=c R
{ 0%IZ -])
CDialog::DoDataExchange(pDX); bun_R-
//{{AFX_DATA_MAP(CCaptureDlg) /6\uBy"Xt
DDX_Control(pDX, IDC_KEY, m_Key); ?@Tsd@s~r
DDX_Check(pDX, IDC_CONTROL, m_bControl); #,})N*7
DDX_Check(pDX, IDC_ALT, m_bAlt); gQY`qz
DDX_Check(pDX, IDC_SHIFT, m_bShift); _ |HA\!
DDX_Text(pDX, IDC_PATH, m_Path); $`0,N_C<}
DDX_Text(pDX, IDC_NUMBER, m_Number); _25PyG
//}}AFX_DATA_MAP F4Cq85#
} p#rqe<Ua
>!o!rs
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O]F(vHK\
//{{AFX_MSG_MAP(CCaptureDlg) +x4*T
ON_WM_SYSCOMMAND() JPgFTr
ON_WM_PAINT() JlEfUg#*
ON_WM_QUERYDRAGICON() 1UB.2}/:
ON_BN_CLICKED(ID_ABOUT, OnAbout) B/hQvA;(
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?A*<Z%}1?
ON_BN_CLICKED(ID_CHANGE, OnChange) ozHL'H
//}}AFX_MSG_MAP n}4q2x"
END_MESSAGE_MAP() X;vUz
8hyXHe
BOOL CCaptureDlg::OnInitDialog() XJq]l6a:
{ 4`RZ&w;1H2
CDialog::OnInitDialog(); -ntQqHs
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /~+Fzz
ASSERT(IDM_ABOUTBOX < 0xF000); 0Q
cJ Ek
CMenu* pSysMenu = GetSystemMenu(FALSE);
nI+.De~
if (pSysMenu != NULL) WBzPSnS2
{ L`rrT
CString strAboutMenu; EgzdRB\Cf
strAboutMenu.LoadString(IDS_ABOUTBOX); {sq:vu@NC
if (!strAboutMenu.IsEmpty()) a/%qn-i|p
{ "#f5jH
pSysMenu->AppendMenu(MF_SEPARATOR); $V/Ke
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b 1."mT!p
} G2|G}#E
} , BZ(-M
SetIcon(m_hIcon, TRUE); // Set big icon ,eqRI>,\
SetIcon(m_hIcon, FALSE); // Set small icon X?`mYoe
m_Key.SetCurSel(0); M%SNq|Lo
RegisterHotkey(); nKTi"2dm
CMenu* pMenu=GetSystemMenu(FALSE); a785xSUV
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v`6vc)>8
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !l6ht{
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Un5 AStG
return TRUE; // return TRUE unless you set the focus to a control @bnw$U`+
} &{q'$oF
}XCh>LvX
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8#1o
{ cnG>EG
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Sm|TDH
{ Upg8t'%{op
CAboutDlg dlgAbout; nmuU*oL
dlgAbout.DoModal(); AOTtAV_e
} ?PV@WrU>B
else 'CG% PjCO
{ t[G7&ovj
CDialog::OnSysCommand(nID, lParam);
9p4SxMMO
} vP%:\u:{
} #9qX:*>h
z>
N73 u
void CCaptureDlg::OnPaint() 2Z`Jr/
{
"tA.`*
if (IsIconic()) l)EtK&er(}
{ 4>Nig.#
CPaintDC dc(this); // device context for painting vEt+^3=
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /}CAd
// Center icon in client rectangle *ck'vV'@
int cxIcon = GetSystemMetrics(SM_CXICON); XuU>.T$] c
int cyIcon = GetSystemMetrics(SM_CYICON); xa{.hp?
CRect rect; lhBAT%U\
GetClientRect(&rect); D>-Pv-f/
int x = (rect.Width() - cxIcon + 1) / 2; vrvi]
Y8
int y = (rect.Height() - cyIcon + 1) / 2; a5w E{K
// Draw the icon kpQN>XV#
dc.DrawIcon(x, y, m_hIcon); OE}c$!@
} ,wyEo>>4)
else wDBU+Z
{ m?;/H
CDialog::OnPaint(); `+UBl\j
} cf%2A1I2W
} zYftgH_o
+)_DaL
E
HCURSOR CCaptureDlg::OnQueryDragIcon() :8?l=B9("g
{ /6y;fx
return (HCURSOR) m_hIcon; V[7D4r.j
} A\.{(,;kp
x
Y}.mP
void CCaptureDlg::OnCancel() gN<J0c)
{ Scmew
if(bTray) /-=h|A#Kh
DeleteIcon(); V.ae 5@;
CDialog::OnCancel(); HisH\z/i5)
} }5B\:*yW
OY!WEP$F-C
void CCaptureDlg::OnAbout() tC7 4=
{ =>GGeEL
CAboutDlg dlg; ~D/1U)kt
dlg.DoModal(); N4WX}
} A 0;ng2&
Ir5E*op7D
void CCaptureDlg::OnBrowse() SzUH6|=.R=
{ xp]9Z]J1l
CString str; ^r{N^
BROWSEINFO bi; X%`:waR
char name[MAX_PATH]; h+9~^<oFl
ZeroMemory(&bi,sizeof(BROWSEINFO)); }rWg']
bi.hwndOwner=GetSafeHwnd(); &uf|Le4
bi.pszDisplayName=name; x5M+\?I<2
bi.lpszTitle="Select folder"; \+C0Rv^^
bi.ulFlags=BIF_RETURNONLYFSDIRS; R~RE21kAc
LPITEMIDLIST idl=SHBrowseForFolder(&bi); OA[fQH#{lX
if(idl==NULL) 5`::#[
return; }=u#,nDl>$
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?MvL}o\|
str.ReleaseBuffer(); `?"r\Qo<
m_Path=str; Lu4>C 2{
if(str.GetAt(str.GetLength()-1)!='\\') $3eoZ1q'U-
m_Path+="\\"; VpED9l]y
UpdateData(FALSE); [-R[rF
} (/!zHq
!H6X%hlk
void CCaptureDlg::SaveBmp() bj?=\u
{ <J.q[fd1*
CDC dc; (Hs,Tj
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 'GLpSWL+*
CBitmap bm; QEF$Jx
int Width=GetSystemMetrics(SM_CXSCREEN); s/P+?8'9
int Height=GetSystemMetrics(SM_CYSCREEN); cSmy
M~[
bm.CreateCompatibleBitmap(&dc,Width,Height); iaRCV6cl
CDC tdc; "Sw raq
tdc.CreateCompatibleDC(&dc); =L{-Hu/j
CBitmap*pOld=tdc.SelectObject(&bm); ?&VKZSo
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9N6 \Ou~
tdc.SelectObject(pOld); )C rsm&
BITMAP btm; [?2,(X0yh1
bm.GetBitmap(&btm); SES-a Mi3
DWORD size=btm.bmWidthBytes*btm.bmHeight; Na+h+wD.D
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !y$+RA7\
BITMAPINFOHEADER bih; "2PT]!
bih.biBitCount=btm.bmBitsPixel; hsYv=Tw3C
bih.biClrImportant=0; b]N&4t
bih.biClrUsed=0; s$^2Qp
bih.biCompression=0; cPg{k}9Tvy
bih.biHeight=btm.bmHeight; lLU8eHf\
bih.biPlanes=1; }!m}?
bih.biSize=sizeof(BITMAPINFOHEADER); S{,|Fa^PPO
bih.biSizeImage=size; 8K&=]:(
bih.biWidth=btm.bmWidth; /.sho\a
bih.biXPelsPerMeter=0; isFxo,R9r
bih.biYPelsPerMeter=0; X-psao0tI`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w`gT]Rn
static int filecount=0; 6Q]JY,+
CString name; :kd]n$]
name.Format("pict%04d.bmp",filecount++); v8C4BuwA
name=m_Path+name; {~XnmBs
BITMAPFILEHEADER bfh; "h8fTB\7S\
bfh.bfReserved1=bfh.bfReserved2=0; x_wWe>0
bfh.bfType=((WORD)('M'<< 8)|'B'); `dRqheX
bfh.bfSize=54+size; F;BCSoO4
bfh.bfOffBits=54; ,}wFQ9*|W
CFile bf; ^S!;snhn
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xRqA^Ad
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MXDUKh7v3
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Ms-)S7tMz
bf.WriteHuge(lpData,size); {*K$gH$
bf.Close(); T*'WS!z
nCount++; wGxH
} sFsf~|
GlobalFreePtr(lpData); Xx\,<8Xn
if(nCount==1) e-b>
m_Number.Format("%d picture captured.",nCount); GH`y-Ul'K
else (D{J|
m_Number.Format("%d pictures captured.",nCount); z:u)@>6D1
UpdateData(FALSE); bc>&Qj2Z7c
} xT!<x({
Ns5P,[pBOZ
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -x|!?u5F
{ K\.tR
if(pMsg -> message == WM_KEYDOWN) A,3qjd,$ c
{ ^$[iLX
if(pMsg -> wParam == VK_ESCAPE) 1pjx8*!B
return TRUE; !t\sg
if(pMsg -> wParam == VK_RETURN) (/X]9
return TRUE; @3bVjQ`4f
} l\|sHn/
return CDialog::PreTranslateMessage(pMsg); nwIj?(8x
} ]0W64cuT
e&!8UYP
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $xjfW/k?M
{ PX` xr1o
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6E.[F\u
SaveBmp(); {uJ"%
return FALSE; 6;;2e> e
} :39arq
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ vJS}_j]_@
CMenu pop; oe!4ng[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); YGRb|P-
CMenu*pMenu=pop.GetSubMenu(0); q$Ms7` a
pMenu->SetDefaultItem(ID_EXITICON); 0f_A"K
CPoint pt; kO$n0y5e
GetCursorPos(&pt); ab]Q1kD
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Tr;.O?@{t}
if(id==ID_EXITICON) wc&D[M]-/
DeleteIcon(); ew]G@66
else if(id==ID_EXIT) %,zHS?)l
OnCancel(); r|i)
return FALSE; }w8yYI
} zL'S5'<F|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N>1d]DrQR
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ef/43+F^x
AddIcon(); >Psq" Xj
return res; a2/Mf
} !YZKa-
ixE w!t
void CCaptureDlg::AddIcon() 6\`8b&'n
{ 15yiDI
o
NOTIFYICONDATA data; f.uy;v
data.cbSize=sizeof(NOTIFYICONDATA); 9vSKIq
CString tip; VN'\c3;
tip.LoadString(IDS_ICONTIP); S(CVkCP
data.hIcon=GetIcon(0); 'fCSP|
data.hWnd=GetSafeHwnd(); LXPO@2QF
strcpy(data.szTip,tip); 16 \)C/*
data.uCallbackMessage=IDM_SHELL; Q>cE G"
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $: |`DCC
data.uID=98; GSd:Plc%
Shell_NotifyIcon(NIM_ADD,&data); \&ki79Ly-
ShowWindow(SW_HIDE); )d2:r 07a
bTray=TRUE; 8=zREt<Se
} oXN(S:ZF
CF@*ki3X
void CCaptureDlg::DeleteIcon() oJ`=ob4WDo
{ ]'w5s dP
NOTIFYICONDATA data; {3kz\FS
data.cbSize=sizeof(NOTIFYICONDATA); kk4+>mk
data.hWnd=GetSafeHwnd(); zQ<;3+*
data.uID=98; nHRk2l|
Shell_NotifyIcon(NIM_DELETE,&data); 4:pgZz!
ShowWindow(SW_SHOW); 4^ U%` 1
SetForegroundWindow(); F^S]7{
ShowWindow(SW_SHOWNORMAL); 69apTx
bTray=FALSE; ck3+A/ !z
} 'GiN^Y9dcc
"S*@._
void CCaptureDlg::OnChange() xtKU;+#
{ ?/-WH?1I
RegisterHotkey(); ]cVDXLj$
} \u))1zRd
]yL+lv
BOOL CCaptureDlg::RegisterHotkey() ;jN1n
xF
{ md!!$+a%|
UpdateData();
|=![J?
UCHAR mask=0; A|YgA66M
UCHAR key=0; (:?bQA'Td
if(m_bControl) )=MK&72r
mask|=4; ?~E"!
if(m_bAlt) }maD8,:t
mask|=2; iHK.hs;
if(m_bShift) 1eEML"
mask|=1; }pnp._j
key=Key_Table[m_Key.GetCurSel()]; z(
}w|
if(bRegistered){ -;FAS3(wy
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;Krb/qr4_
bRegistered=FALSE; w5
] lU
} %Lb
cwh(9
cMask=mask; ;[[6[i
cKey=key; 78~/1-
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); x$D^Bh,
return bRegistered; 9yWf*s<
} I,HtW ),
SJc~E$5<
四、小结 "Z;({a$v
-$I30.#
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。