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:
FcDS*ZEk! Z~5) )5Ye; 一、实现方法
YDt+1Kw}D y>^a~}Zq 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:
V>Wk\'h \/a6h #pragma data_seg("shareddata")
Gz[yD
~6a HHOOK hHook =NULL; //钩子句柄
aB9!}3@ UINT nHookCount =0; //挂接的程序数目
#+I'V\[ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
D Ez,u^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
25^?|9o 7 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
[ERZ".? static int KeyCount =0;
zZ5:)YiW- static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
4fEDg{T #pragma data_seg()
}cKB)N
BJb \o9 \ikR 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。
JAPr[O& _VtQMg|u 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:
k+3qX'fd 8%?y)K^
D BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
dUI5,3* cKey,UCHAR cMask)
'D\Q$q {
I=Y>z^4 BOOL bAdded=FALSE;
(i1JRn-f for(int index=0;index<MAX_KEY;index++){
vvoxK 0 if(hCallWnd[index]==0){
jlEz]@
i hCallWnd[index]=hWnd;
:+rGBkw1m HotKey[index]=cKey;
7s9h:/Lu HotKeyMask[index]=cMask;
wj|Zn+{"nF bAdded=TRUE;
?pDr"XH~ KeyCount++;
PnlI {d break;
1>!LK_ }
gq?:n.;TY }
8[^'PIz return bAdded;
QTV*m>D }
y8Va>ul"U //删除热键
x0*{oP BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
mkl{Tp* {
,$P,x BOOL bRemoved=FALSE;
yU? jmJ for(int index=0;index<MAX_KEY;index++){
; *
[:~5Wc if(hCallWnd[index]==hWnd){
r~w.J+W if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
39pG-otJ hCallWnd[index]=NULL;
L*nK>
+ HotKey[index]=0;
\bA Yic HotKeyMask[index]=0;
Z:;} bRemoved=TRUE;
U)S=JT~h KeyCount--;
.R9Z$Kbq break;
e|~MJu+1 }
]S|FK>U[ }
niVR!l }
DL]tg[w{ return bRemoved;
vW63j't_ }
{h<D/:^v r-2k<#^r bp1AN9~ DLL中的钩子函数如下:
l6viP}R 8xpplo8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xNP_>Qa~ {
"tK%]c d- BOOL bProcessed=FALSE;
:FyF:=
if(HC_ACTION==nCode)
9
_d2u# {
}x8!{Y#cF if((lParam&0xc0000000)==0xc0000000){// 有键松开
*Ak .KBg switch(wParam)
f0<zK! {
ao(T81 case VK_MENU:
~MpikBf MaskBits&=~ALTBIT;
D$>_W ,*V break;
,pNx(a case VK_CONTROL:
N^^0j, MaskBits&=~CTRLBIT;
:5d>^6eoB? break;
S{YzHK case VK_SHIFT:
2[E wN!IZ MaskBits&=~SHIFTBIT;
<v"o+ break;
8;PkuJR_] default: //judge the key and send message
yNTd_XPL break;
U=>S|>daR }
/--p#G h' for(int index=0;index<MAX_KEY;index++){
%H{p&ms if(hCallWnd[index]==NULL)
b7Y g~Lw continue;
V\V
/2u5- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>r.]a ` {
YJi%vQ*] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
QYJ
EUC@ bProcessed=TRUE;
cHFi(K]|1 }
=x~I'|%3 }
x2"iZzQlD }
LQ0/oYmNc else if((lParam&0xc000ffff)==1){ //有键按下
f|RmAP;X, switch(wParam)
*Cy54Z# {
\l+v,ELX= case VK_MENU:
_03?XUKV MaskBits|=ALTBIT;
Fu7:4+ break;
x)5}:b1B= case VK_CONTROL:
5*0zI\ MaskBits|=CTRLBIT;
jX53 owZ break;
&H(yLd[ case VK_SHIFT:
I[z:;4W}L^ MaskBits|=SHIFTBIT;
A_9WSXR break;
f~IJ4T2#N default: //judge the key and send message
!(sn9z# break;
e3~MU6 }
-@TY8#O#- for(int index=0;index<MAX_KEY;index++){
SnCwoxK if(hCallWnd[index]==NULL)
:=QX ^* continue;
qY_qS=H^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yzK; {
~^t@TMk$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
HDVimoOq bProcessed=TRUE;
{@Wv@H+4 }
?vXgHDs^T }
5=>1>HYM }
Lx"GBEkt7 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
WhPP4 # for(int index=0;index<MAX_KEY;index++){
`y8pwWo-o if(hCallWnd[index]==NULL)
_\!]MV continue;
\j8vf0c5b if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
A^U84kV= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
OV>&`puL //lParam的意义可看MSDN中WM_KEYDOWN部分
^@fD{]I }
,0l
Od< }
HR>Y?B{ }
p8Vqy-: return CallNextHookEx( hHook, nCode, wParam, lParam );
OvfluFu7 }
F!z0N .ZXoRT 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:
f}otIf
a[{$4JpK BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3i^X9[. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F%>$WN#2 C=D* 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,{h9f 6jE.X LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
&OR(]Wt0 {
;$p !dI\-Q if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
IUMv{2C {
xJq|,":gj //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
q8 v iC| SaveBmp();
rxCzPF return FALSE;
N:j7J }
:;?$5h*|` …… //其它处理及默认处理
2a d|v] }
">V&{a-C4 (*-wiL /ViY:-8s 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。
J,W<ha* 72HA.!ry 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。
D%SOX N XM'tIE+| 二、编程步骤
w[~G^x& m^X51,+< 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";
I{Du/"r# n,I3\l9 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
.Rr^AGA4 %9-^,og 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;
D(b01EQ;d r. 82RoG?G 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;
E@}F^0c KsDS!O 5、 添加代码,编译运行程序。
U}92%W? hBgE%#`s 三、程序代码
g 9,"u_ F^,:p.ihm< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
$]7f1U_e #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Mj0,Y#=76 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ZmK=8iN9J #if _MSC_VER > 1000
tE*BZXBlm #pragma once
||+~8z#+, #endif // _MSC_VER > 1000
2mLZ4r>WE #ifndef __AFXWIN_H__
@K;b7@4y #error include 'stdafx.h' before including this file for PCH
y r (g/0 #endif
y
oW~ #include "resource.h" // main symbols
.?}M(mL class CHookApp : public CWinApp
c*KE3: {
~IhAO}1 public:
9a`LrB CHookApp();
$8^Hkxy // Overrides
/wDf,Hduz // ClassWizard generated virtual function overrides
bY_'B5$.^2 //{{AFX_VIRTUAL(CHookApp)
C'R9Nn' public:
N0 {e7M virtual BOOL InitInstance();
*'@Oo virtual int ExitInstance();
*85N_+Wv! //}}AFX_VIRTUAL
hSehJjEoM //{{AFX_MSG(CHookApp)
:{u`qi // NOTE - the ClassWizard will add and remove member functions here.
|q`NJ // DO NOT EDIT what you see in these blocks of generated code !
VL%. maj //}}AFX_MSG
WJ{Iv] }9 DECLARE_MESSAGE_MAP()
7_~ A*LM };
=D<0&M9C LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
]545:)Q1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(\\;A? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
D4%J!L<P BOOL InitHotkey();
j>8DaEfwx BOOL UnInit();
;|Cdq #endif
s5~k]"{j c4z&HQd //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
%H{pU:[5* #include "stdafx.h"
aZ@pfWwa: #include "hook.h"
Pps$=` #include <windowsx.h>
Q2
q~m8( #ifdef _DEBUG
j6%W+;{/pj #define new DEBUG_NEW
XgxE M1( #undef THIS_FILE
2w|5SK_ static char THIS_FILE[] = __FILE__;
n%E,[JT #endif
/HIyQW\Ki- #define MAX_KEY 100
%.Y5%TyP #define CTRLBIT 0x04
[@@{z9c #define ALTBIT 0x02
U4XW
Kwq #define SHIFTBIT 0x01
EP:`l #pragma data_seg("shareddata")
Po ?MTA HHOOK hHook =NULL;
N+&uR!:.C UINT nHookCount =0;
n;Bb/Z!~ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
tN#C.M7.'7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
C?qRZB+W# static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
/@:X0}L static int KeyCount =0;
>n7h%c static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
0CzQel)L: #pragma data_seg()
TdFU, HINSTANCE hins;
IQ_6DF void VerifyWindow();
; Y/nS BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
j!+jLm!l //{{AFX_MSG_MAP(CHookApp)
%q5dV<X'c // NOTE - the ClassWizard will add and remove mapping macros here.
Q4XlYgIV2A // DO NOT EDIT what you see in these blocks of generated code!
oh5'Isb$ //}}AFX_MSG_MAP
sL@\,]Y END_MESSAGE_MAP()
SZGR9/*^ BX_yC=S CHookApp::CHookApp()
Pe`mZCd^ {
s;A7:_z#7 // TODO: add construction code here,
a1pp=3Pd?~ // Place all significant initialization in InitInstance
@i ~ A7L0/ }
+4yre^gC `v-[& CHookApp theApp;
~'M<S=W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
21TR_0g&< {
u
X,n[u BOOL bProcessed=FALSE;
L{/%
"2> if(HC_ACTION==nCode)
LR=Ji7 {
$RDlM if((lParam&0xc0000000)==0xc0000000){// Key up
IuY9Q8 switch(wParam)
|WB-N g {
ixA.b#!1 case VK_MENU:
kk
fWiPO^ MaskBits&=~ALTBIT;
'TeH(?3G break;
n/KO{: case VK_CONTROL:
(d4btcg MaskBits&=~CTRLBIT;
Kx9u|fp5 break;
E2DfG^sGV case VK_SHIFT:
YR'F]FI MaskBits&=~SHIFTBIT;
l'I:0a
4T break;
)<5k+O~ default: //judge the key and send message
(dlp5:lQz
break;
88HqP!m%P: }
<::lfPP for(int index=0;index<MAX_KEY;index++){
>/ay'EyY;> if(hCallWnd[index]==NULL)
Zn9tG:V continue;
@gN"Q\;F if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O2fq9%lk {
.wNXvnWr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
R-%6v2;ry bProcessed=TRUE;
$0$sM/ % }
NP;W=A F }
0AHQ(+Ap }
tV!?Ol else if((lParam&0xc000ffff)==1){ //Key down
}y6)d. switch(wParam)
@43psq1 {
<,CrE5Pl case VK_MENU:
U:8[%a MaskBits|=ALTBIT;
t7by OMC break;
"$(+M t^ case VK_CONTROL:
T'p L&@,Q MaskBits|=CTRLBIT;
JuO47}i] 5 break;
~,/@]6S&Y case VK_SHIFT:
?tYZ/ MaskBits|=SHIFTBIT;
<Yki8 break;
4Ly>x>b< default: //judge the key and send message
vAX ( 3 break;
uZ6krI }
;<Q%d~$xy} for(int index=0;index<MAX_KEY;index++)
4&W?:=H2 {
mB-,\{) if(hCallWnd[index]==NULL)
'xH^ksb " continue;
m*m),mZ" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-,bnj^L {
zT>!xGTu7~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
* zp tbZ bProcessed=TRUE;
d-b04Q7DQ }
6x^$W ]R }
=TD`P et }
Z:9 Q~}x8 if(!bProcessed){
{R_>KE1 for(int index=0;index<MAX_KEY;index++){
TAXsL&Tz> if(hCallWnd[index]==NULL)
m,)s8_a continue;
[v~,|N>w if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
coAXYn SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Uxjc&o }
-leX|U}k }
Q]9$dr=Kk0 }
r *K return CallNextHookEx( hHook, nCode, wParam, lParam );
!JA;0[;l= }
FMdu30JV ! AwMD BOOL InitHotkey()
uG\~Hxqw7O {
*I 1 H if(hHook!=NULL){
u ON(LavB nHookCount++;
VKttJok1 return TRUE;
m?(8T|i }
[rx9gOOa& else
f=^xU
P hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
&Ym):pc if(hHook!=NULL)
m|q,ixg nHookCount++;
(~DW_+?]' return (hHook!=NULL);
9w-\K] }
*s4|'KS2o BOOL UnInit()
[Vs\r&qL {
W{;Qi&^ca if(nHookCount>1){
(p2`ofj nHookCount--;
:u4|6? return TRUE;
AA5G`LiT }
Um+_S@h BOOL unhooked = UnhookWindowsHookEx(hHook);
h
/ if(unhooked==TRUE){
LSta]81B4L nHookCount=0;
$!O@Z8B hHook=NULL;
?I?G+(bq }
pX%:XpC!h return unhooked;
n%3!)/$ }
V&f*+!!2 C&z!="hMhR BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"L2*RX.R {
jZ.yt+9 BOOL bAdded=FALSE;
_ ^FC9 for(int index=0;index<MAX_KEY;index++){
0%bCP/ if(hCallWnd[index]==0){
NQqw|3 hCallWnd[index]=hWnd;
)M0`dy{1 HotKey[index]=cKey;
n=!T(Hk HotKeyMask[index]=cMask;
4K^cj2X bAdded=TRUE;
FQ>$Ps*a[ KeyCount++;
]ogifnwv break;
$5pCfW8> }
ehW [LRtq }
qcs)
p return bAdded;
#}#m\=0 }
ndD>Oc}"3 |jIH gm BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/MtmO$. {
[~N;d9H+*1 BOOL bRemoved=FALSE;
=RWTjTZ for(int index=0;index<MAX_KEY;index++){
btg= # u if(hCallWnd[index]==hWnd){
b d 1^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r6FTpOF hCallWnd[index]=NULL;
llZU: bs HotKey[index]=0;
{($bzT7c HotKeyMask[index]=0;
{L;sF=d bRemoved=TRUE;
]+:yfDtZd KeyCount--;
4.,EKw3 break;
:-{"9cgFR }
Zbnxs.i! }
9p8ajlYg, }
^8&}Nk[ j return bRemoved;
P8m0]T.&x }
e=9/3?El i\CA6I void VerifyWindow()
oB 1Qw'J
w {
w>2lG3H< for(int i=0;i<MAX_KEY;i++){
S#GxKMO% if(hCallWnd
!=NULL){ !l*A3qA
if(!IsWindow(hCallWnd)){ ,g?ny<#o
hCallWnd=NULL; c';~bYZ
HotKey=0; Fu.aV876\f
HotKeyMask=0; jgE{JK\n4
KeyCount--; "]"0d[d
} W|2^yO,dX
} VVQ~;{L
} Q+1ot,R
} 8fqabR
wKpGJ&
{
BOOL CHookApp::InitInstance() {v*4mT
{ |V5BL<4
AFX_MANAGE_STATE(AfxGetStaticModuleState()); K#A&
hins=AfxGetInstanceHandle(); <4TI;yy6?
InitHotkey(); QjLU@?&
return CWinApp::InitInstance(); Z0&^(Fb
} l-w4E"n3
3}}/,pGSc
int CHookApp::ExitInstance() tEL;,1
{ L<V20d9
VerifyWindow(); b=Nsz$[
UnInit(); D#<y
pJR
return CWinApp::ExitInstance(); L9/'zhiZBx
} $2Wk#F2c=
=\]gL%N-|
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bZ_&AfcB
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vGyQ306
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4>(K~v5;N
#if _MSC_VER > 1000 Mg\588cI
#pragma once # m|el@)
#endif // _MSC_VER > 1000
Z kw-a
c&T5C,]
class CCaptureDlg : public CDialog I0Do%
{ 0c>>:w20D
// Construction Sp[9vlo8
public: rv[BL.qV
BOOL bTray; VQ!4(
<XD
BOOL bRegistered; 9]3l'
BOOL RegisterHotkey(); |!K&h(J|
UCHAR cKey; |6NvByc,
UCHAR cMask; :vi %7
void DeleteIcon(); >> cW0I/`
void AddIcon(); ?4SYroXUX|
UINT nCount; q[/g3D\G
void SaveBmp(); c+{XP&g8_J
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6No.2Oo
// Dialog Data DQhHU1
//{{AFX_DATA(CCaptureDlg) ,;6%s>Cvd(
enum { IDD = IDD_CAPTURE_DIALOG }; I&|8
qx#
CComboBox m_Key; 7eq.UyUxs
BOOL m_bControl; 3wN4kltt
BOOL m_bAlt; "a(R>PV%
BOOL m_bShift; ^Whc<>|
CString m_Path; K/(LF}
CString m_Number; 1%M^MT%&
//}}AFX_DATA T\wOGaCW
// ClassWizard generated virtual function overrides x75;-q
//{{AFX_VIRTUAL(CCaptureDlg) 3=]/+{B
public: 3Dc^lfn
virtual BOOL PreTranslateMessage(MSG* pMsg); ~@@t-QY
protected: Q\X_JZ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f~d=1
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b c
.Vy
//}}AFX_VIRTUAL CWs;1`aP
// Implementation *RkvM?o@jC
protected: ~=wBF
HICON m_hIcon; ,hK
=x
// Generated message map functions b<fN,U<k
//{{AFX_MSG(CCaptureDlg) 9F,XjPK=
virtual BOOL OnInitDialog(); yMNOjs'c {
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,,XHw;{
afx_msg void OnPaint(); w;VUP@Wm
afx_msg HCURSOR OnQueryDragIcon(); m";8 nm
virtual void OnCancel(); ~l+~MB
afx_msg void OnAbout(); ZbH6$2r
afx_msg void OnBrowse(); D622:Y886
afx_msg void OnChange(); Zo-Au
//}}AFX_MSG zh !/24p9
DECLARE_MESSAGE_MAP() d{!zJ+n
}; -GgV&%'a
#endif "6$+B/5
=L$RY2S"
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^<yM0'0t
#include "stdafx.h" XSZjuQ<[3
#include "Capture.h" :\#]uDT2=
#include "CaptureDlg.h" xT9+l1_
#include <windowsx.h> [t^%d9@t
#pragma comment(lib,"hook.lib") kGq<Zmy|
#ifdef _DEBUG VAxk?P0j6
#define new DEBUG_NEW I |D]NY^
#undef THIS_FILE a(o[ bH.|;
static char THIS_FILE[] = __FILE__; iEFS>kL8e
#endif $AFiPH9
#define IDM_SHELL WM_USER+1 e ]>{?Z
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8/34{2048
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nDC5/xB
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Sdmynuv
U
class CAboutDlg : public CDialog S4O:?^28
{ D/{ Spw@
public: _ )^n[_E
CAboutDlg(); Qzk/oHs
// Dialog Data a7NX~9g
//{{AFX_DATA(CAboutDlg) K3UG6S\B
enum { IDD = IDD_ABOUTBOX }; _Q;M$.[zyR
//}}AFX_DATA CQY/q@7
// ClassWizard generated virtual function overrides a-TsD}'X
//{{AFX_VIRTUAL(CAboutDlg) = &aD!nTx
protected: .+AO3~Dg
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ldoN!J
//}}AFX_VIRTUAL `V ++})5v
// Implementation q14A'XW
protected: UE\@7
//{{AFX_MSG(CAboutDlg) w_J`29uc
//}}AFX_MSG >BQF<
DECLARE_MESSAGE_MAP() 4sK|l|W
}; [dL?N
-p!KsU
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .J\U|r
{ >-y&k^a=
//{{AFX_DATA_INIT(CAboutDlg) <Q-ufF85)
//}}AFX_DATA_INIT zT+yZA.L
} cfe[6N
8CSvg{B
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !c`Q?aGV)
{ 0\}j[-`pF
CDialog::DoDataExchange(pDX); { K0T%.G
//{{AFX_DATA_MAP(CAboutDlg) uJp}9B60_
//}}AFX_DATA_MAP )@`w^\E_~_
} Q+ST8
KF-gcRh
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) XY QUU0R
//{{AFX_MSG_MAP(CAboutDlg) .}y
Lz
// No message handlers #WpO9[b>
//}}AFX_MSG_MAP A8eli=W
END_MESSAGE_MAP() SS~Txt75m
yxQAO_C
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \&qVr1|
: CDialog(CCaptureDlg::IDD, pParent) )J88gMk+
{ RBgkC+2
//{{AFX_DATA_INIT(CCaptureDlg) izWl5}+'B
m_bControl = FALSE; $kz5)vj "
m_bAlt = FALSE; ~O
6~',KD
m_bShift = FALSE; K6oXnz}
m_Path = _T("c:\\"); @x J^JcE
m_Number = _T("0 picture captured."); }>XSp)"{l
nCount=0; (&hX8
bRegistered=FALSE; qK1V!a2
bTray=FALSE; ze\~-0ks+
//}}AFX_DATA_INIT IKr7"`
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gS|xicq!
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }EIwkz8
} )LhO}zQ
rqh,BkQ0t
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) QBn>@jq
{ &{=~)>h
CDialog::DoDataExchange(pDX); a!^wc,
//{{AFX_DATA_MAP(CCaptureDlg) A07P$3>/W
DDX_Control(pDX, IDC_KEY, m_Key); +@qk=]3a
DDX_Check(pDX, IDC_CONTROL, m_bControl); ~D=@4(f8|
DDX_Check(pDX, IDC_ALT, m_bAlt); dO//
DDX_Check(pDX, IDC_SHIFT, m_bShift); yEqmB4^-
DDX_Text(pDX, IDC_PATH, m_Path); \+~4t
DDX_Text(pDX, IDC_NUMBER, m_Number); 7Y*m_AhxJ
//}}AFX_DATA_MAP i:8^:(i
} I~qiF%?d
4K;j:ZJ"x
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ry]7$MQyV
//{{AFX_MSG_MAP(CCaptureDlg) l{a&Zy)
ON_WM_SYSCOMMAND() ;VFr5.*x
ON_WM_PAINT() lqCn5|S]
ON_WM_QUERYDRAGICON() "=n8PNV/
c
ON_BN_CLICKED(ID_ABOUT, OnAbout) ;Gs**BB&
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) E 6@;e-]j
ON_BN_CLICKED(ID_CHANGE, OnChange) {n{}Y.
//}}AFX_MSG_MAP dGteYt_F
END_MESSAGE_MAP() ?(<AT]h V:
pOYtN1uN|
BOOL CCaptureDlg::OnInitDialog() 7h0'R k
{ BD0-v`
CDialog::OnInitDialog(); fDqXM;a"
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2,;t%GB
ASSERT(IDM_ABOUTBOX < 0xF000); !Cy2>6v7
CMenu* pSysMenu = GetSystemMenu(FALSE); *pD;AU
if (pSysMenu != NULL) r"[T9
{ nm-Y?!J
CString strAboutMenu; |YFD|
strAboutMenu.LoadString(IDS_ABOUTBOX); 9|WWA%p
if (!strAboutMenu.IsEmpty()) ` ;=Se_
{ #"{8Z&Z
pSysMenu->AppendMenu(MF_SEPARATOR); oX4uRc7wR
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); GKtQ>39B
} 5#o,]tP
} h^*{chm]
SetIcon(m_hIcon, TRUE); // Set big icon <"+C<[n.
SetIcon(m_hIcon, FALSE); // Set small icon 8)!;[G|
m_Key.SetCurSel(0); ,7g;r_qwA
RegisterHotkey(); m8PB2h
CMenu* pMenu=GetSystemMenu(FALSE); *n'xS L
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Madaxx
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ksaC[G;}:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); A,e^bM
return TRUE; // return TRUE unless you set the focus to a control rw2|1_AF
} DS2$ w9!
z.^
)r
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k-e@G'
{ ~QcKW<bz
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ) :@%xoF5
{ :GYv9OG
CAboutDlg dlgAbout; `7_LJ
\>I
dlgAbout.DoModal(); ~&:R\
} ECzNByP
else vrv*k
{ /,UkT*+>!
CDialog::OnSysCommand(nID, lParam); B,Brmn
} ?$c
} @GtZK
(d#Z-w-
void CCaptureDlg::OnPaint() SXz([Z{)
{ \pGO}{3e*
if (IsIconic()) Z5[:Zf?h7J
{ ;/T-rVND
CPaintDC dc(this); // device context for painting ,-Nk-g
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); AyO|9!F@A
// Center icon in client rectangle _[o^23Hj
int cxIcon = GetSystemMetrics(SM_CXICON); " G6jUTt
int cyIcon = GetSystemMetrics(SM_CYICON); 8w[EyVHA
CRect rect; 9Ol_z\5
GetClientRect(&rect); 3= zQ
U
int x = (rect.Width() - cxIcon + 1) / 2; *KH@u
int y = (rect.Height() - cyIcon + 1) / 2; eBIR*TZ):
// Draw the icon Vb9N~v
dc.DrawIcon(x, y, m_hIcon); RAI&;"
} :Qo
else I7^X;Q
F
{ k&s7-yY
CDialog::OnPaint(); Fd&!-`T?
} J6ShIPc
} A_~5|
MjC%6%HI
HCURSOR CCaptureDlg::OnQueryDragIcon() %:?QE
;
{ xN8JrZE&
return (HCURSOR) m_hIcon; p\;)^O4
} ~J{[]wi
WUS9zK
void CCaptureDlg::OnCancel() f;H#TSJ
{ oD@jtd>b%
if(bTray) rI+w1';C1
DeleteIcon(); c| ( ?
CDialog::OnCancel(); ~9{;VKgK
} >1G*ya)
(x0*(*A}
void CCaptureDlg::OnAbout() lkg*AAR?'
{ ,D2_Z]
CAboutDlg dlg; gCr|e}w-
dlg.DoModal(); s[@>uP
} zf>^2t*\
xevP2pYG:
void CCaptureDlg::OnBrowse() |;m`874
{ 0DVZRB
CString str; \nAHpF
BROWSEINFO bi; 2U`W[
char name[MAX_PATH]; _JTxm>
ZeroMemory(&bi,sizeof(BROWSEINFO)); uo'31V0
bi.hwndOwner=GetSafeHwnd(); )NmlV99q
bi.pszDisplayName=name; Wo+CQH6(
bi.lpszTitle="Select folder"; S/<"RfVU#o
bi.ulFlags=BIF_RETURNONLYFSDIRS; QsJW"4d
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0&IXzEOr
if(idl==NULL) G? gXK W
return; cgxFEv
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )(Mr f{
str.ReleaseBuffer(); !aw#',r8m
m_Path=str; I#E(r>KW*
if(str.GetAt(str.GetLength()-1)!='\\') Vy^yV|`v
m_Path+="\\"; !M&un*
UpdateData(FALSE); Wo9psv7.
} Tb1}XvZ
:@%-f:iDj
void CCaptureDlg::SaveBmp() L@n6N|[_
{ h<'5q&y
CDC dc; 1~5q:X
dc.CreateDC("DISPLAY",NULL,NULL,NULL); j-`X_8W
CBitmap bm; ~J>gVg%66
int Width=GetSystemMetrics(SM_CXSCREEN); =Cy>$/H64
int Height=GetSystemMetrics(SM_CYSCREEN); sC5uA
.?>9
bm.CreateCompatibleBitmap(&dc,Width,Height); 4!~
.6cp3
CDC tdc; Qj<{oZp&
tdc.CreateCompatibleDC(&dc); H]$=*(aje
CBitmap*pOld=tdc.SelectObject(&bm); +iH30v
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yaRcBT?
tdc.SelectObject(pOld); CnSX
BITMAP btm; Xvj=*wg\Y
bm.GetBitmap(&btm); PL9eU y
DWORD size=btm.bmWidthBytes*btm.bmHeight; YP#AB]2\}
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O(D5A?tv!
BITMAPINFOHEADER bih; (ND5CKCR^
bih.biBitCount=btm.bmBitsPixel; r3H}*Wpf
bih.biClrImportant=0; ^/C$L8#
bih.biClrUsed=0; {#1j"
bih.biCompression=0; 2'<=H76
bih.biHeight=btm.bmHeight; H/Ec^Lc+_
bih.biPlanes=1; 33<fN:J]f
bih.biSize=sizeof(BITMAPINFOHEADER); `!omzE*bk5
bih.biSizeImage=size; Xm8Z+}i
bih.biWidth=btm.bmWidth; I51oG:6fR?
bih.biXPelsPerMeter=0; C?60`^
bih.biYPelsPerMeter=0; +eBMn(7Cgv
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); A!ioji+{[
static int filecount=0; v= *Bb3dt
CString name; 5&<d2EG6l'
name.Format("pict%04d.bmp",filecount++); k)5_1 y
name=m_Path+name; _iGU|$a
BITMAPFILEHEADER bfh; iL0jpa<}
bfh.bfReserved1=bfh.bfReserved2=0; !
nCjA\$
bfh.bfType=((WORD)('M'<< 8)|'B'); 7O+Ij9+{n
bfh.bfSize=54+size; 2&gd"Ak(
bfh.bfOffBits=54; F8[B^alAe
CFile bf; p`ADro*
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 'z-;* !A}j
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L`jB)wF/J
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ," C[Qg(
bf.WriteHuge(lpData,size); y^X\^Kq
bf.Close(); XJmFJafQD
nCount++; &gA6+b'
} 4FIV
GlobalFreePtr(lpData); 3"'# |6O9
if(nCount==1) Jm %ynW
m_Number.Format("%d picture captured.",nCount); \m=-8KpU
else i5
L:L
m_Number.Format("%d pictures captured.",nCount); <o&o=Y8
UpdateData(FALSE); DIG0:)4R.
} 5@ bc(H
$bZu^d,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &\1'1`N1
{ egI{!bZg'\
if(pMsg -> message == WM_KEYDOWN) ,pyQP^u-
{ QGH
h;
if(pMsg -> wParam == VK_ESCAPE) Jt2,LL:G
return TRUE; /lLov.
if(pMsg -> wParam == VK_RETURN) Vl{~@G, @
return TRUE;
w.J%qWJq
} G Sz @rDGY
return CDialog::PreTranslateMessage(pMsg); k-WHHoU>o
} *?_qE
`E} p77
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <$jKy 3@
{ w0 Fwd
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Yzj%{fkh
SaveBmp(); &GdL 9!hH
return FALSE; r]k*7PK
} Kajkw>z
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y)3~]h\a
CMenu pop; p!+L
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aGPqh,<QD
CMenu*pMenu=pop.GetSubMenu(0); ow2M,KU6Z
pMenu->SetDefaultItem(ID_EXITICON); [O^}rUqq
CPoint pt;
<1aa~duT
GetCursorPos(&pt); [O=W>l
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hzaLx8L
if(id==ID_EXITICON) :3*`IB !
DeleteIcon(); \Y*!f|=of
else if(id==ID_EXIT) W`#gpi)7N
OnCancel(); A)8rk_92Q
return FALSE; qE>i,|rP`
} jEUx
q%BH
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H}vn$$
O
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) VR"u*
AddIcon(); <O ;&qT*b
return res; }dy9IH
} A?e,U,
5B%w]n
void CCaptureDlg::AddIcon() GGCqtA^@7d
{ Js/N()X
NOTIFYICONDATA data; FyCBNtCv
data.cbSize=sizeof(NOTIFYICONDATA); e\`wlaP,
CString tip; 49o\^<4b
tip.LoadString(IDS_ICONTIP); XmP;L(wa
data.hIcon=GetIcon(0); avlqDi1l
data.hWnd=GetSafeHwnd(); x'@W=P 7
strcpy(data.szTip,tip); R;WW
f.#
data.uCallbackMessage=IDM_SHELL; Q-[3j
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; LyIKP$t
data.uID=98; -:MmSeG7gO
Shell_NotifyIcon(NIM_ADD,&data); $u:<x
ShowWindow(SW_HIDE); $nj\\,(g
bTray=TRUE; !6lOIgn
} ^D>fis
]* 0(-@
void CCaptureDlg::DeleteIcon() '}_=kp'X
{ )&>L !,z
NOTIFYICONDATA data; q$F) !&
data.cbSize=sizeof(NOTIFYICONDATA); }@wVW))6$
data.hWnd=GetSafeHwnd(); #+$ zE#je
data.uID=98; k=e`*LB\
Shell_NotifyIcon(NIM_DELETE,&data); mKM,kY
ShowWindow(SW_SHOW); *m*`}9
SetForegroundWindow(); Wu ,S\!
ShowWindow(SW_SHOWNORMAL); YNI;h%w
bTray=FALSE; yx2z%E
} YV-j/U{&
1DUb
[W8
void CCaptureDlg::OnChange() q]K'p,'
{ ]
@ufV
RegisterHotkey(); B;V5x/
} ~Po<(A}`f
\Dfm(R
BOOL CCaptureDlg::RegisterHotkey() cM3jnim
{ 0*/kGvw`i
UpdateData(); +,z)#
UCHAR mask=0; *#zS^b n
UCHAR key=0; m~;B:LN<
if(m_bControl) CI^[I\$&
mask|=4; u\f3qc,]F
if(m_bAlt) B_hPcmB
mask|=2; mg` j[<wp
if(m_bShift) tU{\ev$x
mask|=1; L"^OdpOs
key=Key_Table[m_Key.GetCurSel()]; k=`$6(>Fz
if(bRegistered){ "CBRPp
DeleteHotkey(GetSafeHwnd(),cKey,cMask); #BsW
bRegistered=FALSE; P].eAAXnP
} L/yaVU{aEb
cMask=mask; :> SLQ[1
cKey=key; \9w~pO
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); GV5qdD(
return bRegistered; "kU]
} 1DqX:WM6
h/HHKn
四、小结 `]jqQr97
?_%u)S*g
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。