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:
LjCUkbzQF
Nr?CZFN# 一、实现方法
sGG
q~7 Cs2kbG_ 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:
lf#5X)V =
OzpI #pragma data_seg("shareddata")
r6vI6|1 HHOOK hHook =NULL; //钩子句柄
~ DP5Qi UINT nHookCount =0; //挂接的程序数目
IO7cRg'-F static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
lC@wCgc static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
`*3;sq%` static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
x27$h)R0v static int KeyCount =0;
;$3epP static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
T_[ #pragma data_seg()
`6<Qb= hWi2S!*Y 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
m-]F]c=)w< p^ ONJL DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
o_a' <7\#i |k#EYf#Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
pgPm0+N
cKey,UCHAR cMask)
E+cx8( {
8>`8p0I$+
BOOL bAdded=FALSE;
Oj
'^Ww m for(int index=0;index<MAX_KEY;index++){
$B`ETI9g-N if(hCallWnd[index]==0){
Vg}+w Nt5 hCallWnd[index]=hWnd;
;?C`Jagx HotKey[index]=cKey;
|lN=q44I HotKeyMask[index]=cMask;
L@.Trso bAdded=TRUE;
1d OB| KeyCount++;
!X`cNd)0Xo break;
mc4|@p* }
f.0HIc }
is=x6G*r return bAdded;
T?CQgVR }
+wfZFJ:1l //删除热键
A<IV"bo BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+mN8uU~(kx {
NfZC} BOOL bRemoved=FALSE;
+xQj-r)- for(int index=0;index<MAX_KEY;index++){
R)-~5"}~ if(hCallWnd[index]==hWnd){
>0?ph<h1[q if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
qv[w
1;U" hCallWnd[index]=NULL;
GJ:oUi HotKey[index]=0;
[8>#b_> HotKeyMask[index]=0;
J;ycAF ~ bRemoved=TRUE;
z{/#/,V5D4 KeyCount--;
-.K'rW break;
6=96 ^o* }
!-t"}^) }
f|Nkk*9$ }
>M^:x-mib return bRemoved;
>sQf{uL }
*ZIX76y<!A iD/+#UTY |h6,.#n DLL中的钩子函数如下:
vhzz(UPUt !Wj`U$]; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
jOZ>^5} {
E8 5TCS1 BOOL bProcessed=FALSE;
AoY!f'Z if(HC_ACTION==nCode)
W6):IW(E {
<pM6fI6BD if((lParam&0xc0000000)==0xc0000000){// 有键松开
:;\xyy}A switch(wParam)
Gp=V%w\FDW {
fi%lN_Ev? case VK_MENU:
>^SQrB MaskBits&=~ALTBIT;
BZIU@^Q_Y[ break;
+0%Y.O/{ case VK_CONTROL:
0}M'> MaskBits&=~CTRLBIT;
EyHL& break;
jI~$iDdOfs case VK_SHIFT:
]2{]TJ@B MaskBits&=~SHIFTBIT;
?Zb3M break;
T8^l}Y
B default: //judge the key and send message
^S 45!mSb break;
n8JM
0 U- }
9*XT|B for(int index=0;index<MAX_KEY;index++){
HY;kV6g{P if(hCallWnd[index]==NULL)
/J9Or{#r continue;
PKd'lo if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X{ :3UTBR {
,;Uf>8~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
A@-U#UvN bProcessed=TRUE;
?)Je%H }
=CO'LyG }
) )t]5Ys%; }
olKM0K else if((lParam&0xc000ffff)==1){ //有键按下
&Lbwx&!0b switch(wParam)
/. H(& {
,$U~<Zd case VK_MENU:
5W=Jn?y2 MaskBits|=ALTBIT;
x$FcF8 break;
rC_saHo>#R case VK_CONTROL:
>CwI(vXn MaskBits|=CTRLBIT;
ca5;Z@t$S break;
}}bMq.Q' case VK_SHIFT:
qyh]v [ MaskBits|=SHIFTBIT;
i 1Kq(7 break;
PDLps[a default: //judge the key and send message
4J?\JcGs break;
7r2p+LP[ }
#w8.aNU+] for(int index=0;index<MAX_KEY;index++){
50a';!H if(hCallWnd[index]==NULL)
=(~Zm B\ continue;
/82E[P"}6R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~Q5]?ZNX {
[)il_3t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
{s8g;yU5 bProcessed=TRUE;
s#8T46? }
0uIBaW3s }
&|' NDcp }
irP*:QM if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
:^`WrcOJ for(int index=0;index<MAX_KEY;index++){
FYb]9MX if(hCallWnd[index]==NULL)
4,?beA continue;
'I:_}q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Bwu?DK SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
IkxoW:L //lParam的意义可看MSDN中WM_KEYDOWN部分
`$FB[Z} & }
DghqSL^s }
P+C5
s }
Z v*uUe return CallNextHookEx( hHook, nCode, wParam, lParam );
AYfe_Dj }
s,l*=< BuUM~k&SY 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:
T0.sL9 e E(+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0QxBC7`qp BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&}K%F)S if3z Fh 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:
}J2f$l>R q(4Ny<=,'K LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
.u`A4;;Gw {
{xOzxLB; if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
\Co
Z+ {
i6y=3k //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
e@S\7Ks SaveBmp();
q8,,[R_ return FALSE;
k~F,n }
e2g`T{6M …… //其它处理及默认处理
hS>=pO+y }
Qstd;qE~ ln":j?` @ScC32X 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
O1+yOef"k 3(gOF&Uf9 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
ed`7GZB L$@+'Qn@: 二、编程步骤
)@!T_# J3B+WD] 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";
Z&=Oe^ ?_v_*+b_ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
;7QG]JX rFUd 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;
:LC3>x`: IWI$@dng6 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;
x?od_M;*8; UPPlm\wb* 5、 添加代码,编译运行程序。
WP=uHg Xg\unUHa 三、程序代码
<7zz"R %b~ND?nn- ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
3C'6i #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
$vn)(zn+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
5H|7DVG #if _MSC_VER > 1000
'-$cvH7_ #pragma once
Y"nz l]T #endif // _MSC_VER > 1000
I]3!M`IMG #ifndef __AFXWIN_H__
CkNh3'<wg #error include 'stdafx.h' before including this file for PCH
?sR( #endif
"9N;&^I #include "resource.h" // main symbols
gA3f@7}d class CHookApp : public CWinApp
}]<|`FNc {
@x;(yqOb public:
NS;LFeGD CHookApp();
bfpoX,: // Overrides
':DL // ClassWizard generated virtual function overrides
-.L )\ //{{AFX_VIRTUAL(CHookApp)
FIu^Qd public:
a4Z e!l( virtual BOOL InitInstance();
G]mD_J1$ virtual int ExitInstance();
ULs'oT)K; //}}AFX_VIRTUAL
2 OqEyXh //{{AFX_MSG(CHookApp)
|$+/IxDP // NOTE - the ClassWizard will add and remove member functions here.
@=Dc(5`[ // DO NOT EDIT what you see in these blocks of generated code !
?ef7%0 //}}AFX_MSG
yf-2E_yB DECLARE_MESSAGE_MAP()
h`( VMf'# };
s0Z)BR # LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
P:%b[7 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
'MNCJ;A@V BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&5G@YQD1e BOOL InitHotkey();
q]*jTb BOOL UnInit();
cmq4w&x/ #endif
e-1G\}E 'q RQO(9&m //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
+oHbAPs8 #include "stdafx.h"
ou`KkY|| #include "hook.h"
=)*ZrD #include <windowsx.h>
Y^;izM} #ifdef _DEBUG
z\?<j%e!t #define new DEBUG_NEW
rfzzMV #undef THIS_FILE
+Hp`(^( static char THIS_FILE[] = __FILE__;
;E>#qYC6 #endif
LB9W.cA
#define MAX_KEY 100
T21?~jS #define CTRLBIT 0x04
`0MQL@B #define ALTBIT 0x02
p _3xW{I #define SHIFTBIT 0x01
'/AX'U8Y #pragma data_seg("shareddata")
)_?h;wh 84 HHOOK hHook =NULL;
.MID)PY- UINT nHookCount =0;
|ZXz&Xor static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"=JE12=u static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
/FC(d5I static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
8HHR static int KeyCount =0;
7KJ0>0~Et static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
={;+0Wjb8 #pragma data_seg()
m}S}fH( HINSTANCE hins;
W5~!)Ec void VerifyWindow();
:_ =YH+bZ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
6s
~!B{Q //{{AFX_MSG_MAP(CHookApp)
WT3g31 // NOTE - the ClassWizard will add and remove mapping macros here.
X\i;j!;d // DO NOT EDIT what you see in these blocks of generated code!
S/RChg_L5 //}}AFX_MSG_MAP
(Jk[%_b>_ END_MESSAGE_MAP()
b)E<b{'W o|#F@L3i CHookApp::CHookApp()
[,MK)7DU {
0"ooHP$1 // TODO: add construction code here,
Ww#!-,*]o // Place all significant initialization in InitInstance
+Yc@<$4 }
wjgF e] \'iy(8i CHookApp theApp;
]!a?Lr LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L=M'QJl9 {
U;"J8 BOOL bProcessed=FALSE;
C?'s if(HC_ACTION==nCode)
]^i^L {
]9JH.fF if((lParam&0xc0000000)==0xc0000000){// Key up
E\cX switch(wParam)
6o5,d] {
dO,;k+ case VK_MENU:
gr{*wYL MaskBits&=~ALTBIT;
<HIM
k break;
]<r.{EJ case VK_CONTROL:
Q0,eE: MaskBits&=~CTRLBIT;
#JXXq%4
@ break;
UN:qE oS case VK_SHIFT:
\=&Z_6Mu MaskBits&=~SHIFTBIT;
Gi2Fjq/Y break;
*Tr{a_{~C default: //judge the key and send message
8F's9c, break;
} j;es(~D }
EQ|Wke for(int index=0;index<MAX_KEY;index++){
dy'lM ;@- if(hCallWnd[index]==NULL)
w|*D{`O continue;
{LCKt/Z>P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
x~{W(;`! {
N%1nii SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
UdA,.C0 bProcessed=TRUE;
v$g\]QS
p }
)@y7 qb }
02T'B&&~ }
, q{~lf- else if((lParam&0xc000ffff)==1){ //Key down
9>`dB switch(wParam)
h'_$I4e) {
aVr =7PeF case VK_MENU:
BqA_CW MaskBits|=ALTBIT;
|oe break;
<E^;RG case VK_CONTROL:
wx!2/I> MaskBits|=CTRLBIT;
9-24c break;
3a=\$x@ case VK_SHIFT:
LX=v
_}l
J MaskBits|=SHIFTBIT;
s~o\j/ break;
9|OOT[ default: //judge the key and send message
nQa:t. rC break;
YQD/vc~8G }
~@[<y1g?nG for(int index=0;index<MAX_KEY;index++)
@l5GBsLK {
9jNh%raG| if(hCallWnd[index]==NULL)
\b$Y_ continue;
GJHJ?^% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f;Ijl 0d@ {
p1mAoVxR SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
&& PZ; bProcessed=TRUE;
7 `c! }
]v]:8>N }
W ,v0~ }
wqJl[~O$ if(!bProcessed){
pE X Q for(int index=0;index<MAX_KEY;index++){
1&9w]\Ae7l if(hCallWnd[index]==NULL)
wByTNA7 continue;
6VJS
l%X if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
40dwp*/! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]k+(0qxG }
c>+68<H }
,pQ[e$u1 }
7m?fvKy return CallNextHookEx( hHook, nCode, wParam, lParam );
jtE'T}! d }
R4$(NNC+/ &yOl}?u BOOL InitHotkey()
T\:*+W37 {
&Mt0Qa[ if(hHook!=NULL){
dNov= w nHookCount++;
[6/8O return TRUE;
NZFUC D) }
:()K2<E else
OIjG`~Rx hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
DNyt_5j&: if(hHook!=NULL)
:2:%
nHookCount++;
C#3&,G W return (hHook!=NULL);
fRkx ^u
P }
6k<3,`VV| BOOL UnInit()
x;LO{S4Z {
b5f+q:?{ if(nHookCount>1){
-mLu!32I< nHookCount--;
'UZ i>Ta return TRUE;
$*Wa A`(U }
&h=f BOOL unhooked = UnhookWindowsHookEx(hHook);
fGe"1MfU if(unhooked==TRUE){
W2M[w_~QE nHookCount=0;
%dhrXK5 hHook=NULL;
1'dZ?`O }
;sz _W%-;@ return unhooked;
Xr88I^F; }
(|3?wX'2U B8!$?1*^a BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
R"\(a {
dX[Xe BOOL bAdded=FALSE;
;4Xx5*E for(int index=0;index<MAX_KEY;index++){
zN-Y=-c if(hCallWnd[index]==0){
mS0;2xU hCallWnd[index]=hWnd;
;<xPzf HotKey[index]=cKey;
7_rDNK@e HotKeyMask[index]=cMask;
$~?)E;S
bAdded=TRUE;
^v:XON< KeyCount++;
T|
R!Aw. break;
rL?{+S]&^) }
n0%S: ( }
3x
z
z*
< return bAdded;
` 1y @c"t }
h53G$Ol. 4!
F$nmG) BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V!e*J,g {
'A1y~x#2B BOOL bRemoved=FALSE;
N4{g[[ T for(int index=0;index<MAX_KEY;index++){
v3kT~uv if(hCallWnd[index]==hWnd){
47A[-&y*X if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j)juvat hCallWnd[index]=NULL;
57;(
P HotKey[index]=0;
]5MT-qU HotKeyMask[index]=0;
|I|,6*)xg bRemoved=TRUE;
KxfH6:\RB KeyCount--;
9C5F#(uY break;
^W^Y"0y9` }
0G+qF96 }
qP=a:R- }
t$R0UprK return bRemoved;
GSH,;cY }
BAT.> GpR,n2 void VerifyWindow()
%%h.`p1 {
vSH-hAk for(int i=0;i<MAX_KEY;i++){
yHZ&5 if(hCallWnd
!=NULL){ Wv,?xm
if(!IsWindow(hCallWnd)){ 'kg~#cf/+
hCallWnd=NULL; U2\k7I
HotKey=0; oDGBC
HotKeyMask=0; F:.8O ,%u
KeyCount--; !9j6l0
} *0r!eD
} HPo><u
} 4]Gm4zO
} -;i:bE
F>%,}Y~B:
BOOL CHookApp::InitInstance() 2<V`
{ wGHVq
fm5
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^a!oq~ZSy
hins=AfxGetInstanceHandle(); ?3v-ppw%
InitHotkey(); QPvWdjf#mM
return CWinApp::InitInstance(); ZOx;]D"s
} UM0#S}
Kf$6D 79#
int CHookApp::ExitInstance() \fYPz }wt
{ X[?E{[@Z
VerifyWindow(); zNEN[
UnInit(); t!>0^['g4
return CWinApp::ExitInstance(); 8. %g&%S
} u(ETc*D]
`1FNs?j
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file avXBCvP+h
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I6S>*V
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VHL[Y
#if _MSC_VER > 1000 q'X#F8v
#pragma once F^=y+}]=
#endif // _MSC_VER > 1000 jo0XOs
i/C0
(!
class CCaptureDlg : public CDialog -}8r1jQH;
{ e
>7Ka\
// Construction G2:.8ok
public: X'2%'z<
BOOL bTray; *2YWvGc
BOOL bRegistered; 0zA:?}
BOOL RegisterHotkey(); '6T *b
UCHAR cKey; 5xH*&GpL7
UCHAR cMask; i2LN`5k
void DeleteIcon(); 5iGz*_
m
void AddIcon(); PK_2
UINT nCount; Y)M-?|4
void SaveBmp(); Ow-;WO_HQ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor wMM1Q/-#
// Dialog Data /5\{(=0
//{{AFX_DATA(CCaptureDlg) P rv=f@
enum { IDD = IDD_CAPTURE_DIALOG }; +bWo{
CComboBox m_Key; b}hQU~,E
BOOL m_bControl; 2D3mTpw
BOOL m_bAlt; ;N
_%O
BOOL m_bShift; 9HlM0qE5b
CString m_Path; M IU B]
CString m_Number; ;;EFiaA
//}}AFX_DATA owO&[D/
// ClassWizard generated virtual function overrides p\]rxtm
//{{AFX_VIRTUAL(CCaptureDlg) 1}CJ&
public: SNH AL F
virtual BOOL PreTranslateMessage(MSG* pMsg); P>|sCF
protected: j?!/#'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dmMrZ1u2
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gLbTZM4i
//}}AFX_VIRTUAL )_Iu7b
// Implementation 9a'}j#mJo
protected: @\=4 Rin/q
HICON m_hIcon; >vuR:4B
// Generated message map functions Q:Y`^jP
//{{AFX_MSG(CCaptureDlg) "YVvmCp
virtual BOOL OnInitDialog(); Hqu?="f=
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3tmS/tQp
afx_msg void OnPaint(); GbC JGqOR
afx_msg HCURSOR OnQueryDragIcon(); }5QUIK~NA
virtual void OnCancel(); U(<~("ocN
afx_msg void OnAbout(); W:2j.K9!
afx_msg void OnBrowse(); 1.a:iweN
afx_msg void OnChange(); tA
K=W$r
//}}AFX_MSG .WGrzhsV
DECLARE_MESSAGE_MAP() ]pVuRj'pP
}; j7VaaA
#endif (T.g""N~`
^3Z~RK\}
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [?)He} _L
#include "stdafx.h" 9['>$ON
#include "Capture.h" 1Msc:7:L
#include "CaptureDlg.h" 3gW+|3E
#include <windowsx.h> )fc+B_
#pragma comment(lib,"hook.lib") hWr}Uui
#ifdef _DEBUG YXGxE&!
#define new DEBUG_NEW 1(Lq9hs`
#undef THIS_FILE /8lmNA
static char THIS_FILE[] = __FILE__; XBTjb
#endif
_+&/P&
#define IDM_SHELL WM_USER+1 QEY#U|
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); byIP]7Ld
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b.xG'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; //^{u[lr
class CAboutDlg : public CDialog /J&_ZDNV~
{ LT/*y=
public: iDlg>UYd
CAboutDlg(); q9(hn_X@/
// Dialog Data 1_)Y{3L
//{{AFX_DATA(CAboutDlg) |eej}G(,m}
enum { IDD = IDD_ABOUTBOX }; sTi3x)#xB
//}}AFX_DATA #-g2p?+i&
// ClassWizard generated virtual function overrides HU-#xK
//{{AFX_VIRTUAL(CAboutDlg) :2;c@ uj
protected: -L2%,.E>4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zY&/lWW._
//}}AFX_VIRTUAL m=MM
// Implementation - QQU>_
protected: }\EHZ
//{{AFX_MSG(CAboutDlg) ^
}|$_
//}}AFX_MSG !7Z?VEZ
DECLARE_MESSAGE_MAP() stOD5yi
}; 9:*a9xT,
12 bztlv
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HgOrrewj
{ N<aMUV m
//{{AFX_DATA_INIT(CAboutDlg) (KphAA8
//}}AFX_DATA_INIT *Di ;Gf@
} B|-W
8?t}S2n2
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l'"Ici#7Ls
{ ;VgB!
CDialog::DoDataExchange(pDX); Yg]!`(db
//{{AFX_DATA_MAP(CAboutDlg) Kd3EZo.
//}}AFX_DATA_MAP HhB'
^)
} w?M` gl8r
>jm^MS=
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) S6c>D&Q
//{{AFX_MSG_MAP(CAboutDlg) U5H5QW +
// No message handlers qmbhx9V
//}}AFX_MSG_MAP oMF[<Xf
END_MESSAGE_MAP() PkDh[i9Z|
|`@7G`x
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)
lD?]D&
: CDialog(CCaptureDlg::IDD, pParent) UphZRgT!N
{ ":01M},RA
//{{AFX_DATA_INIT(CCaptureDlg) Yr 1k\q
m_bControl = FALSE; ?4lEHef
m_bAlt = FALSE; bU_P@GKB
m_bShift = FALSE; S| l%JM^
m_Path = _T("c:\\"); gnZc`)z
m_Number = _T("0 picture captured."); #80r?,q
nCount=0; A{\!nq_~N
bRegistered=FALSE; ||rZ+<
bTray=FALSE; eu?DSad
//}}AFX_DATA_INIT s"0Hz"[^=
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 42,K8
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); cu"ge]},
} Wvwjj~HP2}
jxDA+7
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .\|}5J9W
{ {tF)%>\#
CDialog::DoDataExchange(pDX); e&F=w`F\
//{{AFX_DATA_MAP(CCaptureDlg) RVa{%
DDX_Control(pDX, IDC_KEY, m_Key); rA1;DSw6E[
DDX_Check(pDX, IDC_CONTROL, m_bControl); Xa&0j&AH
DDX_Check(pDX, IDC_ALT, m_bAlt); QPp>%iE@
DDX_Check(pDX, IDC_SHIFT, m_bShift); Cg%}=
DDX_Text(pDX, IDC_PATH, m_Path); DVjsz
DDX_Text(pDX, IDC_NUMBER, m_Number); ?YhGW
//}}AFX_DATA_MAP 5@{~830
} _l&.<nz
Ct9*T`Gl
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =}YaV@g<f
//{{AFX_MSG_MAP(CCaptureDlg) \%]!/&>{6
ON_WM_SYSCOMMAND() o\:vxj+%*
ON_WM_PAINT() bODyJ7=[
ON_WM_QUERYDRAGICON() 8jU6N*p/
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3("E5lI(g:
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2)jf~!o)Z
ON_BN_CLICKED(ID_CHANGE, OnChange) D>"!7+t|@a
//}}AFX_MSG_MAP H.[t&VO
END_MESSAGE_MAP() =1% <
]j^rJ|WTH
BOOL CCaptureDlg::OnInitDialog() OJPi*i 5*
{ c:_dW;MJ0
CDialog::OnInitDialog(); ;F\sMf{
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #l-/!j
ASSERT(IDM_ABOUTBOX < 0xF000); ? ]hS^&
CMenu* pSysMenu = GetSystemMenu(FALSE); 4F?O5&329i
if (pSysMenu != NULL) >7nOR
{ kaZ_ra;<
CString strAboutMenu; >Mk#19j[/
strAboutMenu.LoadString(IDS_ABOUTBOX); qc@v"pIz'S
if (!strAboutMenu.IsEmpty()) t[b@P<F
{ {DbWk>[DkG
pSysMenu->AppendMenu(MF_SEPARATOR); -owap-Va
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); TvwkeOS#}7
} qM:*!Aq0g
} A,! YXl[
SetIcon(m_hIcon, TRUE); // Set big icon k= oCpXq^
SetIcon(m_hIcon, FALSE); // Set small icon s,;L6nX"
m_Key.SetCurSel(0); WEk3
4crk
RegisterHotkey(); ;q%V)4
CMenu* pMenu=GetSystemMenu(FALSE); PgwNE wG
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z^ }4bR]
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Gque@u
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); </)QCl' d
return TRUE; // return TRUE unless you set the focus to a control ]`_eaW?Ua
} RWINdJZ
0;x<0P
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5Z(#)sa0Og
{ CGJ>j}C
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Tlz~o[`&
{ ;$rh&ET
CAboutDlg dlgAbout; %3 VToj@`>
dlgAbout.DoModal(); 1agI/R
} t Ai?B jo
else SoL"M[O
{ {xJ<)^fD8
CDialog::OnSysCommand(nID, lParam); $o>6Io|D
} L s(l
} udGZ%Mr_
qq[Enf|/y
void CCaptureDlg::OnPaint() Ai.^~#%X
{ tY6QhhuS:
if (IsIconic()) 5u&hp
{ "y$s`n4Mj
CPaintDC dc(this); // device context for painting d m$iiRY
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [rtMx8T
// Center icon in client rectangle 5WU?Km
int cxIcon = GetSystemMetrics(SM_CXICON); 7G 5VwO
int cyIcon = GetSystemMetrics(SM_CYICON); 8Xk,Nbcqt
CRect rect; qBXIR}
GetClientRect(&rect); jK-usn
int x = (rect.Width() - cxIcon + 1) / 2; @sLB
_f
int y = (rect.Height() - cyIcon + 1) / 2; K8g9IZ*lT
// Draw the icon ]:F?k#c
dc.DrawIcon(x, y, m_hIcon); \4roM1&[
} u^]Z{K_B
else
I<LIw8LI
{ $%0A#&DVh
CDialog::OnPaint(); WTQd}f
} <<[\
Rv
} H"J>wIuGX
Ur2)];WZ
HCURSOR CCaptureDlg::OnQueryDragIcon() 3IDX3cM9
{ -q}I;
cH
return (HCURSOR) m_hIcon; x] j&Knli
} LCkaSv/[RB
\s">trXwX
void CCaptureDlg::OnCancel() W#lt_2!j
{ b<"LUM*;
if(bTray) Jqgo\r%`
DeleteIcon(); 5R/k8UZ
CDialog::OnCancel(); (G`O[JF
} wQw
y+S
6V6,m4e
void CCaptureDlg::OnAbout() >q)VHV9P
{ $>!tpJw
CAboutDlg dlg; \R (Yf!>
dlg.DoModal(); s.9_/cFWB
} D./3,z
2&d|L|->
void CCaptureDlg::OnBrowse() P_Ni
5s)
{ BewJ!,A!
CString str; k#pNk7;MZ
BROWSEINFO bi; 71!'k>]h
char name[MAX_PATH]; xr).ZswQ
ZeroMemory(&bi,sizeof(BROWSEINFO)); `} :~,E
bi.hwndOwner=GetSafeHwnd(); |;MW98 A
bi.pszDisplayName=name; w@&(=C
bi.lpszTitle="Select folder"; AG(Gtvw
bi.ulFlags=BIF_RETURNONLYFSDIRS; i+eDBg6
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4'BZ +A,p
if(idl==NULL) pQ yH`
return; 4&+lc*
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `/L D:R
str.ReleaseBuffer(); TwLQ;Q
m_Path=str; /E<:=DD<
if(str.GetAt(str.GetLength()-1)!='\\') _"c:Z !L
m_Path+="\\"; ".Sa[A;~
UpdateData(FALSE); +EE(d/f
} W+ D{4:
RLr^6+v)U
void CCaptureDlg::SaveBmp() ?-D'xqc
{ ~sbn"OS+
CDC dc; nh?~S`
dc.CreateDC("DISPLAY",NULL,NULL,NULL); N4[^!}4
CBitmap bm; `}|$eF&
int Width=GetSystemMetrics(SM_CXSCREEN); `as6IMqJD
int Height=GetSystemMetrics(SM_CYSCREEN); Z}s56{!.
bm.CreateCompatibleBitmap(&dc,Width,Height); 4]mAV\1
CDC tdc; }N%uQP#I
tdc.CreateCompatibleDC(&dc);
D/]
CBitmap*pOld=tdc.SelectObject(&bm); )ME'qA3K
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2!;U.+(
tdc.SelectObject(pOld); Ki(
BITMAP btm; (YKkJ
bm.GetBitmap(&btm); '
DWORD size=btm.bmWidthBytes*btm.bmHeight; WDq~mi
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); QTT2P(Pz
BITMAPINFOHEADER bih; {axMS yp;
bih.biBitCount=btm.bmBitsPixel; G+zIh}9
bih.biClrImportant=0; FCA]zR1
bih.biClrUsed=0; 2}jC%jR2
bih.biCompression=0; -/3D0`R
bih.biHeight=btm.bmHeight; p~NFiZ,
bih.biPlanes=1; S^*ME*DDz
bih.biSize=sizeof(BITMAPINFOHEADER); 3KN>t)A#
bih.biSizeImage=size; g]Fm%iy
bih.biWidth=btm.bmWidth; wwVg'V;
bih.biXPelsPerMeter=0; >[a&,gS
bih.biYPelsPerMeter=0; fe$O Pl~
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ch,%xs.)G
static int filecount=0; m(eR Wx&pZ
CString name; Bl!R
bh\
name.Format("pict%04d.bmp",filecount++); Ze- MB0w
name=m_Path+name; B96"|v$
BITMAPFILEHEADER bfh; ] R-<v&O
bfh.bfReserved1=bfh.bfReserved2=0; mqk tM6
bfh.bfType=((WORD)('M'<< 8)|'B'); Gn}^BJN
bfh.bfSize=54+size; uPQrDr5
bfh.bfOffBits=54; h&j9'
CFile bf; )R@M~d-o
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *Ph@XkhU
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); UcxMA%Pw7$
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f5dctDHP
bf.WriteHuge(lpData,size); OXIy0].b
bf.Close(); nHTb~t5Ke
nCount++; >P[BwL]
} :1,xs e
GlobalFreePtr(lpData); wS}Rl}#Oh?
if(nCount==1) =?s0.(;
m_Number.Format("%d picture captured.",nCount); ^{R.X:a
else w6FVSU]sY
m_Number.Format("%d pictures captured.",nCount); c!HmZ]/
UpdateData(FALSE); ST7Xgma-
} Fb&WwGY,P
m?_@.O@]
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) A
^U`c'$
{ 1G62Qu$O
if(pMsg -> message == WM_KEYDOWN) 4oywP^I
{ t o2y#4'.
if(pMsg -> wParam == VK_ESCAPE) UgAG2
return TRUE; vQhi2J'
if(pMsg -> wParam == VK_RETURN) ruK,Z,3Q
return TRUE; DX#_0-o
} G;Thz
return CDialog::PreTranslateMessage(pMsg); !:|[?M.`
} fw+ VR.#2H
X'XH-E
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k*Vf2O3${
{ "'\f?A9
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5KvqZ1L
SaveBmp(); 2z615?2_U
return FALSE; #uillSV
} DY6ra% T
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (D
<o=Q
CMenu pop; fS?fNtD6<
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Od@<L
CMenu*pMenu=pop.GetSubMenu(0); ^#)M,.G^
pMenu->SetDefaultItem(ID_EXITICON); EaXDY<
CPoint pt; ug.'OR
GetCursorPos(&pt); os~}5QJ
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KM jnY2
if(id==ID_EXITICON) )'Yoii{dSU
DeleteIcon(); IWD21lS
else if(id==ID_EXIT) %2t#>}If!
OnCancel(); Y~+`F5xX<
return FALSE; 1?N$I}?
} dpI9DzA;
LRESULT res= CDialog::WindowProc(message, wParam, lParam); RRBBz7:~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) SdOE^_@:
AddIcon(); U)y~{E~c34
return res; [V _?`M
} JHIXTy__
3PU'd^
void CCaptureDlg::AddIcon() 'p:L"L}Q?
{ aq<QKnU
NOTIFYICONDATA data; P|{Et=R`1
data.cbSize=sizeof(NOTIFYICONDATA); `p{,C`g,R
CString tip; b"QeCw#v`>
tip.LoadString(IDS_ICONTIP); ]53'\TH
data.hIcon=GetIcon(0); ajMI7j^G
data.hWnd=GetSafeHwnd(); PquATAzQA
strcpy(data.szTip,tip); @E5}v
data.uCallbackMessage=IDM_SHELL; 1ps_zn(
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x.-d>8-!]c
data.uID=98; V|mz]H#|
Shell_NotifyIcon(NIM_ADD,&data); .7Lv
ShowWindow(SW_HIDE); n`af2I2
bTray=TRUE; J~URv)g
} KQ\d$fX
TDnbX_xC<
void CCaptureDlg::DeleteIcon() P 2^((c
{ .ugQH<B
NOTIFYICONDATA data; Yt%
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data.cbSize=sizeof(NOTIFYICONDATA); ZUxlk+o9d
data.hWnd=GetSafeHwnd(); !ii'hwFm$
data.uID=98; oHI/tS4
_
Shell_NotifyIcon(NIM_DELETE,&data); ]psx\ZMa
ShowWindow(SW_SHOW); ^vH3 -A;*
SetForegroundWindow(); ?
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ShowWindow(SW_SHOWNORMAL); j*05!j<'
bTray=FALSE; 8NS1* \z
} v'zj<|2
2E
X Rq
void CCaptureDlg::OnChange() 6
SosVE>Z
{ q|fZdTw
RegisterHotkey(); !NfN16
} Rf.b_Y@O
[6Nw)r(a(
BOOL CCaptureDlg::RegisterHotkey() zLHE;
{ G B&+EZ
UpdateData(); A"8"e*
UCHAR mask=0; b!ea(D!:
UCHAR key=0; 6bW:&IPQ;
if(m_bControl) :$ "L;"
mask|=4; 4;hgi[
if(m_bAlt) sXaIQhZ
mask|=2; rtM!|apr
if(m_bShift) zxr|:KC ?&
mask|=1; t% f6P
key=Key_Table[m_Key.GetCurSel()]; wWNHZv&
if(bRegistered){ |,wp@)e6h
DeleteHotkey(GetSafeHwnd(),cKey,cMask); vHz]-Q-|9
bRegistered=FALSE; m+m,0Ey5H
} A/4HR]
cMask=mask; P,[O32i#
cKey=key; &]? X"K
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);
G$"$k=[
return bRegistered; '!6Py1i
} L)LW5%.6
CrIt h/Z
四、小结 'l}T_7g
}`,}e 259
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。