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:
q9(Z9$a(\
La$?/\Dv) 一、实现方法
8*^*iEsR LoW}!,| 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:
<Aqo['] e \. #pragma data_seg("shareddata")
r*UE>_3J HHOOK hHook =NULL; //钩子句柄
`t>:i!s/ UINT nHookCount =0; //挂接的程序数目
X*t2h3"} static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
-nqq;|% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
<3laNk static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
]/7#[ static int KeyCount =0;
|!L0X@> static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
o]<J&<WM #pragma data_seg()
Dlg9PyQ c~u91h? 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}ZK( YL/B7^fd8 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:
IHv>V9yiG t:YMF$Z BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
6*:U1{Gl) cKey,UCHAR cMask)
Pr3>}4M {
> ,x``- BOOL bAdded=FALSE;
lJt?0;gn for(int index=0;index<MAX_KEY;index++){
814cCrr,o if(hCallWnd[index]==0){
Bi7&yS5V hCallWnd[index]=hWnd;
5=Il2 HotKey[index]=cKey;
7`tJ/xtMy; HotKeyMask[index]=cMask;
Bz?
(?fyd bAdded=TRUE;
[JKLlR KeyCount++;
C);I[H4Yfw break;
@s0 mX3P }
cToT_Mk }
^bECX<,H return bAdded;
EZ[e
a< }
P98g2ak //删除热键
\f'= BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
kV4,45r {
"] ]aF1 BOOL bRemoved=FALSE;
mXI'=Vo!S for(int index=0;index<MAX_KEY;index++){
6L3i
if(hCallWnd[index]==hWnd){
2FQTu*p&B if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>aT~G!y hCallWnd[index]=NULL;
7GRPPh<4 HotKey[index]=0;
a}[rk*QmZ HotKeyMask[index]=0;
/%TL{k&m$ bRemoved=TRUE;
?~ <NyJHN% KeyCount--;
hfpis== break;
6t3Zi:=I }
')ZZ)&U>z }
=m6<H }
>3&9Wbv> return bRemoved;
\"b'Z2g }
JG@Zb}b xn anca ;Qidf}: DLL中的钩子函数如下:
=lL)g"xX Tr,
zV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
n@J>,K_B {
's$/-AV BOOL bProcessed=FALSE;
.gY=<bG/fA if(HC_ACTION==nCode)
;_m;:< {
V!QC.D< if((lParam&0xc0000000)==0xc0000000){// 有键松开
{
T?1v*.[ switch(wParam)
8zQN[[#n {
7=a
e^GKo case VK_MENU:
_% i!LyG MaskBits&=~ALTBIT;
0~e6\7={ break;
Ehq
[4} case VK_CONTROL:
\{={{O MaskBits&=~CTRLBIT;
fa!8+kfi break;
>^D5D%" case VK_SHIFT:
sLf~o"yb MaskBits&=~SHIFTBIT;
l_pf9!z break;
qfF2S default: //judge the key and send message
lqvP
Dz break;
. dJBv }
s?PB ]Tr for(int index=0;index<MAX_KEY;index++){
1V-si bE if(hCallWnd[index]==NULL)
eE@7AM continue;
j|LO g if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%$=2tfR {
fni7HBV? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
OV`li#H bProcessed=TRUE;
J:G{ }
cyB2=, }
BzTzIo5 }
ie7P^:T|+ else if((lParam&0xc000ffff)==1){ //有键按下
Nt687 switch(wParam)
PsBLAr\ah {
TjOK8
t case VK_MENU:
m`n#Q#6 MaskBits|=ALTBIT;
oWq]\yT<` break;
UTqKL*p523 case VK_CONTROL:
r`e6B!p MaskBits|=CTRLBIT;
?=b#H6vs break;
1^2]~R9,9 case VK_SHIFT:
J7@Q;gcl: MaskBits|=SHIFTBIT;
oz7=1;r break;
Qjmo{'d default: //judge the key and send message
.x1.` Y break;
=.qPjp_Qd }
G$2Pny<! for(int index=0;index<MAX_KEY;index++){
X39%O' if(hCallWnd[index]==NULL)
,_@) IN continue;
Uurpho_~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=KHX_ib {
{Rn*)D9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
@_?Uowc8 bProcessed=TRUE;
7Ac.^rv5 }
jWso'K }
MHS|gR.c }
dRUmC H if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
;A0ZcgF for(int index=0;index<MAX_KEY;index++){
={50>WXE if(hCallWnd[index]==NULL)
P>R u continue;
[d=BN ,? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|}@teN^J*U SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
q NUd "%S //lParam的意义可看MSDN中WM_KEYDOWN部分
VH] <o0 }
3?TUt{3g }
JY%l1:}G3 }
t-Ble return CallNextHookEx( hHook, nCode, wParam, lParam );
o1H6E1$= }
B/B`=%~5_^ &_' evZ8 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:
V!s#xXD } n>,? V3ly BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
F(w<YU%6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
CKX3t:HP0 +No Ve# 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:
1*:BOoYx QV
-ZP'e^ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
m?=J;r"Re {
TJ|do`fw> if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
{x~r$")c? {
dJ~Occ 1~r //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
xPJ@!ks9 SaveBmp();
10_>EY` return FALSE;
sTvw@o* }
uEkGo5 …… //其它处理及默认处理
U"Y/PBs, }
c/%GfB[w0 n{=Ot^
"; \b#`Ahf` 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Th4}$)yrkN 7?8+h 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。
Ym2Ac>I4 q-S#[I+g 二、编程步骤
tO3#kV\, /xd|mo)D 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";
TXqtE("BDl !E^\)=E)P 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
XE#$|Z ycf)*0k 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
)U{\c2b hLT?aQLx 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
eL
[.;_ {&J
OO 5、 添加代码,编译运行程序。
ITD&wg *P?Rucg 三、程序代码
c`oW-K{ vZPBjloT!. ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
QFFFxaeJg #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
^ZFK:|Ju #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
f,Am;:\ | #if _MSC_VER > 1000
s<5P sR #pragma once
ViU5l*n; #endif // _MSC_VER > 1000
p9&gKIO_m #ifndef __AFXWIN_H__
[@@EE>
y #error include 'stdafx.h' before including this file for PCH
<Vh}d/ #endif
yoM^6o^,D #include "resource.h" // main symbols
M3eFG@, class CHookApp : public CWinApp
bQdu= s[ {
Kp19dp}'b public:
#P
{|7}jk
CHookApp();
;,xM* // Overrides
s\Ln // ClassWizard generated virtual function overrides
/Eu|Jg=I //{{AFX_VIRTUAL(CHookApp)
1JV-X G6 public:
PoLk{{l3 virtual BOOL InitInstance();
wGWv<<Qw" virtual int ExitInstance();
'_ys4hz} //}}AFX_VIRTUAL
%8>0;ktU //{{AFX_MSG(CHookApp)
B/Ltb^a // NOTE - the ClassWizard will add and remove member functions here.
s0DT1s& // DO NOT EDIT what you see in these blocks of generated code !
i;\n\p1 //}}AFX_MSG
orAr3`AR3 DECLARE_MESSAGE_MAP()
NTVaz. };
9)uJ\NMy LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Ao\Im(? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
I/u>Gt BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
B?4Iu)bCxI BOOL InitHotkey();
R`,|08E BOOL UnInit();
.etG>tH #endif
hfg
^z5 u5Mg //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
SeLFubs_ #include "stdafx.h"
*a-KQw
#include "hook.h"
%q6I- #include <windowsx.h>
#$l:% #ifdef _DEBUG
>` u8( #define new DEBUG_NEW
X2{Aa T*M #undef THIS_FILE
)[ejb?{d static char THIS_FILE[] = __FILE__;
tRNMiU #endif
TgKSE1 #define MAX_KEY 100
Zh_3ydMD1 #define CTRLBIT 0x04
5ka6=R(r #define ALTBIT 0x02
/x\~5cC #define SHIFTBIT 0x01
V5gr-^E #pragma data_seg("shareddata")
^-F#"i|Cn HHOOK hHook =NULL;
h;R>|2A UINT nHookCount =0;
'=J|IN7WT static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
P1|3%#c static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
7/iN`3Bz static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Yy,XKIqU static int KeyCount =0;
# hw;aQ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
(Dn1Eov #pragma data_seg()
0 c]] HINSTANCE hins;
`#l1 void VerifyWindow();
cv. j BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
m%c]+Our` //{{AFX_MSG_MAP(CHookApp)
5x!rT&!G // NOTE - the ClassWizard will add and remove mapping macros here.
yh'*eli // DO NOT EDIT what you see in these blocks of generated code!
-J0I2D //}}AFX_MSG_MAP
^2i$AM1t END_MESSAGE_MAP()
+W8kMuM! Hm+VGH'H? CHookApp::CHookApp()
2'Raj'2S4 {
}0]iS8*tL // TODO: add construction code here,
PGuPw'2;[ // Place all significant initialization in InitInstance
X_)x Fg'k }
I:1Pz|$` xpI8QV$# CHookApp theApp;
gLlA'`! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
n6 wx/: {
<RcB: h BOOL bProcessed=FALSE;
-h=wLYl@0i if(HC_ACTION==nCode)
]C{N4Ni^Z {
.N7&Jy
if((lParam&0xc0000000)==0xc0000000){// Key up
7^1K4%IPl switch(wParam)
t0Inf
[um {
O`Htdnu case VK_MENU:
~*`wRiUhis MaskBits&=~ALTBIT;
O{Q+<fBC9 break;
VBW][f case VK_CONTROL:
),$^h7[n MaskBits&=~CTRLBIT;
!j3Xzn9 break;
)JU`Z@?8 case VK_SHIFT:
h!tg+9% MaskBits&=~SHIFTBIT;
olm'_{{
break;
ZgmK~iJ default: //judge the key and send message
|)mUO:* break;
XW+-E^d }
g!i45]6[Nw for(int index=0;index<MAX_KEY;index++){
Z%
]LZ/O8 if(hCallWnd[index]==NULL)
%}unlSTPP continue;
}H/94]~tH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~+PK Ws'}F {
lB7/oa1]> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
pp2 Jy{\d bProcessed=TRUE;
rddn"~lm1 }
2} _^~8 }
HUbXJsSP }
M7#CMLy else if((lParam&0xc000ffff)==1){ //Key down
aM:tg1g switch(wParam)
e}s,WC2- {
M&e=LV case VK_MENU:
21] K7 MaskBits|=ALTBIT;
WGo ryvEx break;
2o7o~r case VK_CONTROL:
BF"eVKA MaskBits|=CTRLBIT;
`W7;- break;
(l/i# case VK_SHIFT:
}a%Wu 7D MaskBits|=SHIFTBIT;
.!'rI7Kz'i break;
Kr`.q:0GK default: //judge the key and send message
3%u: c]-wF break;
VeH%E.: }
yr)e."#S for(int index=0;index<MAX_KEY;index++)
'=d y
= {
g^U-^f if(hCallWnd[index]==NULL)
a, `B.I continue;
K3&k+~$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8jiBLZkRf {
k8cR`5@PK SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
swMR+F#u* bProcessed=TRUE;
S<5.}c R }
@[1,i~H }
6!){-IV }
Y"dTm;& if(!bProcessed){
Rli`]~!w for(int index=0;index<MAX_KEY;index++){
\\ZhM if(hCallWnd[index]==NULL)
:ra[e(l9 continue;
MW0CqMi]T if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
nVGOhYn SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\_+Af` }
7j"B-k# }
Z#K0a' }
"T} HH return CallNextHookEx( hHook, nCode, wParam, lParam );
M[e{(iQ: }
luz,z(
v !m9g\8tE BOOL InitHotkey()
ul"Z%
1] {
vmW`}FKW if(hHook!=NULL){
4Cvo^k/I nHookCount++;
(e<p^TJ] return TRUE;
`2'*E\ }
f&XM|Bg else
+ Cq&~<B hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
eqpnh^0}d if(hHook!=NULL)
l%`~aVGJ nHookCount++;
|~=4ZrcCP return (hHook!=NULL);
-Q1~lN m: }
b+BX >$ BOOL UnInit()
xCMuq9zt@ {
C+gu'hD if(nHookCount>1){
l_(4CimOZ nHookCount--;
|D8c=c% return TRUE;
O^R^Aw }
8)J,jh9q BOOL unhooked = UnhookWindowsHookEx(hHook);
XsMETl"Av4 if(unhooked==TRUE){
=I+5sCF{g nHookCount=0;
pf0uwXo hHook=NULL;
>
!HC
? }
=gSACDTc return unhooked;
ry4:i4/[ }
JZ-M<rcC > 'JWW*Y! BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
u_$Spbc]/ {
>k
u7{1) BOOL bAdded=FALSE;
IZ]L.0, for(int index=0;index<MAX_KEY;index++){
$U%N$_k? if(hCallWnd[index]==0){
oXqx]@7 hCallWnd[index]=hWnd;
tNW0 C] HotKey[index]=cKey;
`]<~lf HotKeyMask[index]=cMask;
E8We2T[^M bAdded=TRUE;
|U="B4 KeyCount++;
td2bL4 break;
q -^Z=,< }
}5"19
Go? }
T9gQq
7(l return bAdded;
iLFhm4.PO }
r}t%DH uC1v^!D BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
et}s yPH {
w"j [c#vM BOOL bRemoved=FALSE;
dJZ
9mP!d for(int index=0;index<MAX_KEY;index++){
e1K{*h if(hCallWnd[index]==hWnd){
bJ6v5YA% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
GZ"J6/0-| hCallWnd[index]=NULL;
N)$yBzN HotKey[index]=0;
$EuI2.o HotKeyMask[index]=0;
7me1:}4 bRemoved=TRUE;
hC2Ra "te) KeyCount--;
p5=VGKp break;
eadY(-4|I- }
'gz@UE1 }
@nF#\ }
_"[O=h: return bRemoved;
fkr;
a`<W }
<1E*wPm8 Gt?ckMB void VerifyWindow()
$e![^I]` {
dp>Lh TLc for(int i=0;i<MAX_KEY;i++){
j[y+'O if(hCallWnd
!=NULL){ (8.|q6Nww
if(!IsWindow(hCallWnd)){ 'I)E.D oF
hCallWnd=NULL; t8b,@J`R
HotKey=0; cBnB(t%
HotKeyMask=0; L+"5g@
KeyCount--; C)Hb=
} ~r>N
} 1)=sbFtS
} w1|YR
} KP!ctlP~
3`m
n#RM
BOOL CHookApp::InitInstance() 9Vv&\m!0
{ 8I=migaxP
AFX_MANAGE_STATE(AfxGetStaticModuleState()); |;P9S
hins=AfxGetInstanceHandle(); ?QCHkhU
InitHotkey(); Y<-dd"\
return CWinApp::InitInstance(); 0@8EIQxK"
} _}wy|T&7k&
4 5\%2un
int CHookApp::ExitInstance() _zj}i1!E"
{ d[I}+%{[
VerifyWindow(); BM]sW:-v
UnInit(); FA;uu\
return CWinApp::ExitInstance(); lO0 PZnW9
} kculHIa\.
|JH1?n
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p)=Fi}#D\
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y vjRJ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bi[gyl#
#if _MSC_VER > 1000 mEe JK3D[
#pragma once R%N&Y~zH
#endif // _MSC_VER > 1000 d.uJ}=|
O
hcPlr
class CCaptureDlg : public CDialog |^E#cI
{ UGJ#
"9
// Construction q#N8IUN}4
public: ro4 XA1
BOOL bTray; 3?GEXO&,E
BOOL bRegistered; -kd_gbnr3
BOOL RegisterHotkey(); p<3^= 8Y$
UCHAR cKey; j5;eSL@/
UCHAR cMask; hE>i~:~R
void DeleteIcon(); S_B;m1
void AddIcon(); htGk:
UINT nCount; y2eeE CS]
void SaveBmp(); f^f{tOX
CCaptureDlg(CWnd* pParent = NULL); // standard constructor n.$wW
=
// Dialog Data C.$`HGv
//{{AFX_DATA(CCaptureDlg) nAJ<@a
enum { IDD = IDD_CAPTURE_DIALOG }; <w d+cPZQr
CComboBox m_Key; kiFTx
&gf
BOOL m_bControl; sX,oJIt
BOOL m_bAlt; e'uI~%$NJL
BOOL m_bShift; ?gMxGH:B.&
CString m_Path; v='h
CString m_Number; G6(U\VFqO
//}}AFX_DATA ;F;`y),
// ClassWizard generated virtual function overrides \^+=vO;A
//{{AFX_VIRTUAL(CCaptureDlg) ')/yBH9mR
public: Dh|8$(Jt
virtual BOOL PreTranslateMessage(MSG* pMsg); =@>[
protected: XZe ZqBr
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ggUJ -M'2h
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yA+:\%y$
//}}AFX_VIRTUAL 0g@
8x_3
// Implementation c91rc>
protected: 4W9#z~'
HICON m_hIcon; 5? `*i"
// Generated message map functions #Xc6bA&
//{{AFX_MSG(CCaptureDlg) Q1Sf7)
virtual BOOL OnInitDialog(); X,<n|zp
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^ cn)eA
afx_msg void OnPaint(); \P_1@sH=
afx_msg HCURSOR OnQueryDragIcon(); eJrJ5mlI`
virtual void OnCancel(); H}QOoXWkg
afx_msg void OnAbout(); V[Jd1T
afx_msg void OnBrowse(); h@"dpmpe
afx_msg void OnChange(); 8ctUK|
//}}AFX_MSG "1H?1"w~
DECLARE_MESSAGE_MAP() 6XO%l0dC.
}; YoKY&i6r}
#endif S/|'ggC
X#mp pMU
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file daIt `} s
#include "stdafx.h" .4"9o%
#include "Capture.h" NGlX%j4j
#include "CaptureDlg.h" AoEG%nT
#include <windowsx.h> AopCxaJ`
#pragma comment(lib,"hook.lib") ui,#AZQ#{4
#ifdef _DEBUG EF?@f{YY$n
#define new DEBUG_NEW EwcN$Ma
#undef THIS_FILE PYl(~Vac
static char THIS_FILE[] = __FILE__; UJ_E&7,L
#endif HKk;oG
#define IDM_SHELL WM_USER+1 dD3I. ?DY
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y
zXL8
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [}|-%4s
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hgCeU+ H
class CAboutDlg : public CDialog 0.-2FHc9L
{ J}qk:xGL
public: ?3"bu$@8
CAboutDlg(); aU3
m{pE
// Dialog Data 9Kw4K#IqQ
//{{AFX_DATA(CAboutDlg) -So&?3,\A@
enum { IDD = IDD_ABOUTBOX }; '~ 3a(1@8
//}}AFX_DATA :cmfy6h]
// ClassWizard generated virtual function overrides O1Gd_wDC/i
//{{AFX_VIRTUAL(CAboutDlg) SB1\SNB
protected: @O<kjR<b
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xr)Rx{)3h
//}}AFX_VIRTUAL K4i#:7r'b
// Implementation zlmb_akJ
protected: 2yhtJ9/
//{{AFX_MSG(CAboutDlg) >WMH.5p
//}}AFX_MSG kE tYuf^
DECLARE_MESSAGE_MAP() Lnnl++8Y
}; `RUr/|S
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "PBUyh-Z
{ 'g8~539{&
//{{AFX_DATA_INIT(CAboutDlg) SnRTC<DDh
//}}AFX_DATA_INIT i8w(G<Y=
} 9N|O*h1;u
cxdhG"
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $Xw .iN]g
{ twqjaFA>
CDialog::DoDataExchange(pDX); ti)foam
//{{AFX_DATA_MAP(CAboutDlg) e*e}X&|(g
//}}AFX_DATA_MAP 2Av3.u8%u
} `Y-uNJ'.N
/_?E0r
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >A|6kzC
//{{AFX_MSG_MAP(CAboutDlg) wh:O"&qk
// No message handlers %b2.JGBqJ
//}}AFX_MSG_MAP SI3ek9|XU
END_MESSAGE_MAP() .!Kdi| a)
h[%`'(
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1sZwW P
: CDialog(CCaptureDlg::IDD, pParent) P@:#NU[
{ +I#5?
//{{AFX_DATA_INIT(CCaptureDlg) KP7bU9odJ
m_bControl = FALSE; |n3PznV
m_bAlt = FALSE; W|3XD-v@
m_bShift = FALSE; qtTys gv
m_Path = _T("c:\\"); '8~7Ru\KyX
m_Number = _T("0 picture captured."); .
zvF!!z
nCount=0; Pv{ {zyc
bRegistered=FALSE; =*qu:f\y
bTray=FALSE; B&#TbKp
//}}AFX_DATA_INIT SC`.VCfc.
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6pI=?g
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B3u5EgZr
} w*r.QzCu,5
X~Uvh8O
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) WS@b3zzN
{ GwV2`2
CDialog::DoDataExchange(pDX); l}%!&V0
//{{AFX_DATA_MAP(CCaptureDlg) ?@l9T)fF
DDX_Control(pDX, IDC_KEY, m_Key); j|9;")
1
DDX_Check(pDX, IDC_CONTROL, m_bControl); "?V4Tl~uu
DDX_Check(pDX, IDC_ALT, m_bAlt); Qv,|*bf
DDX_Check(pDX, IDC_SHIFT, m_bShift); D Y($
DDX_Text(pDX, IDC_PATH, m_Path); 5UR$Pn2a2
DDX_Text(pDX, IDC_NUMBER, m_Number); JQ'NFl9<
//}}AFX_DATA_MAP dfGdY"&
} ZPn`.Qc
EkM? Rs
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) q(e&{pbM)
//{{AFX_MSG_MAP(CCaptureDlg) pzezN
ON_WM_SYSCOMMAND() Q <EFd
ON_WM_PAINT() tt,MO)8VD
ON_WM_QUERYDRAGICON() zWgNDYT~
ON_BN_CLICKED(ID_ABOUT, OnAbout) fQlR;4QX]
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) RG[3LX/
ON_BN_CLICKED(ID_CHANGE, OnChange) ~d ~$fR
//}}AFX_MSG_MAP kg7oH.0E
END_MESSAGE_MAP() \&]'GsfF
KP[ax2!x
BOOL CCaptureDlg::OnInitDialog() m;lwMrY\7>
{ {*As-Y:'F
CDialog::OnInitDialog(); I 6a{'c(P
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {QTfD~z^K
ASSERT(IDM_ABOUTBOX < 0xF000); ^Qrdh0j
CMenu* pSysMenu = GetSystemMenu(FALSE); *nluK
if (pSysMenu != NULL) \szx.IZT
{ oA}&o_Q%
CString strAboutMenu; ]|( (&Y
rl
strAboutMenu.LoadString(IDS_ABOUTBOX); ouK&H|'
if (!strAboutMenu.IsEmpty()) =-~82%
{ MFaK=1
pSysMenu->AppendMenu(MF_SEPARATOR); ]<A|GY0q1
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Z,qo
jtw
} zht^gOs
} U2=5Nt5
SetIcon(m_hIcon, TRUE); // Set big icon wt[MzpR P
SetIcon(m_hIcon, FALSE); // Set small icon |[}YM%e
m_Key.SetCurSel(0); g}@_
@
RegisterHotkey(); |!i3Y=X
CMenu* pMenu=GetSystemMenu(FALSE); 41mg:xW(J
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b[?6/#N
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /d9I2~}B
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); kWc%u-_
return TRUE; // return TRUE unless you set the focus to a control .B{3=z^
} QQ!%lbMK]
hAHl+q)w?
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bKYLBu:
{ [Oe$E5qv)]
if ((nID & 0xFFF0) == IDM_ABOUTBOX) uz".!K[,wE
{ 5Jd&3pO
CAboutDlg dlgAbout;
FAJ\9
dlgAbout.DoModal(); 4\x'$G
} :Sk0?WU
else muo(bR8
{ bdk"7N
CDialog::OnSysCommand(nID, lParam); vUR{!`14
} ^q_0(Vf
} 5Az=)q4Q
<33[qt~
void CCaptureDlg::OnPaint() ^E8&!s
{ oU% rP
if (IsIconic()) .%<oy"_
{ X{P_HCd
CPaintDC dc(this); // device context for painting ez&v"J
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Kjc"K36{L
// Center icon in client rectangle \$T
int cxIcon = GetSystemMetrics(SM_CXICON); n'v[[bmu
int cyIcon = GetSystemMetrics(SM_CYICON); [MdVgJ9'
CRect rect; _)O1v%]"4
GetClientRect(&rect); f}0(qN/G
int x = (rect.Width() - cxIcon + 1) / 2; _N$3c<dY'
int y = (rect.Height() - cyIcon + 1) / 2; z 3fS+x:E{
// Draw the icon .slA}
dc.DrawIcon(x, y, m_hIcon); z*>"I
} SN(:\|f
2
else k q8:h
{ $IA(QC_]AO
CDialog::OnPaint(); Oj\lg2Ck
} HhhN8t
} D' ZR>@w@
hU3c;6]3
HCURSOR CCaptureDlg::OnQueryDragIcon() L&MR%5
{ WW\u}z.QJ
return (HCURSOR) m_hIcon; =LDzZ:' X
} O&V}T#8n
O;9u1,%w
void CCaptureDlg::OnCancel() Dz:A.x@$*
{ 21bvSK
if(bTray) aB0L]i
DeleteIcon(); _d76jmujJ
CDialog::OnCancel(); 6!bVPIyYO
} ]@vX4G/
#8MA+
void CCaptureDlg::OnAbout() U748$%}]
{ 8{#WF#
CAboutDlg dlg; NE,2jeZQ .
dlg.DoModal(); jB!p,fqcb
} 5,})x]'x
Fm_^7|
void CCaptureDlg::OnBrowse() u\ro9l
{ .LhIB?
CString str; u)Y~+ [Q
BROWSEINFO bi; O`Er*-O
char name[MAX_PATH]; :f
G5?])
ZeroMemory(&bi,sizeof(BROWSEINFO)); U<gMgA
bi.hwndOwner=GetSafeHwnd(); @)1>ba
bi.pszDisplayName=name; 4='Xhm
bi.lpszTitle="Select folder"; t'|A0r$
bi.ulFlags=BIF_RETURNONLYFSDIRS; dIg/g~ t"
LPITEMIDLIST idl=SHBrowseForFolder(&bi); m_zl*s*6
if(idl==NULL) .T
6NMIp*
return; rn $a)^!
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y<0zAsT
str.ReleaseBuffer(); QMLz
m_Path=str; 1"YN{Ut;G
if(str.GetAt(str.GetLength()-1)!='\\') _v bCC7Bf8
m_Path+="\\"; a$r-
U_?
UpdateData(FALSE); g>-pC a
} 3O7]~5 j1
qq.M]?Z
void CCaptureDlg::SaveBmp() S[J eW
{ 3u#bx1
CDC dc; !iA3\Ai"
dc.CreateDC("DISPLAY",NULL,NULL,NULL); CuC1s>
CBitmap bm; a?S5 =
int Width=GetSystemMetrics(SM_CXSCREEN); E-IV v
int Height=GetSystemMetrics(SM_CYSCREEN); N;4bEcWjp
bm.CreateCompatibleBitmap(&dc,Width,Height); nF>41 K
CDC tdc; kH~ z07:
tdc.CreateCompatibleDC(&dc); w=:o//~6j
CBitmap*pOld=tdc.SelectObject(&bm); 6!zBLIYFI
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )12.W=p
tdc.SelectObject(pOld); {,NGxqhE
BITMAP btm; JJ_b{ao<
bm.GetBitmap(&btm); 3n;>k9{
DWORD size=btm.bmWidthBytes*btm.bmHeight; ]xC#XYE:dy
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w\,N}'G
BITMAPINFOHEADER bih; ]<L(r,@,
bih.biBitCount=btm.bmBitsPixel; d-c<dS+R
bih.biClrImportant=0; /N= }wC
bih.biClrUsed=0; ?C)a0>L
bih.biCompression=0; 7]W6\Z
bih.biHeight=btm.bmHeight; (rqc_ZU5
bih.biPlanes=1;
7 OAM
bih.biSize=sizeof(BITMAPINFOHEADER); x1H1[0w,i
bih.biSizeImage=size; Q2yD4>qy
bih.biWidth=btm.bmWidth; eyW8?:
bih.biXPelsPerMeter=0; &H8wYs
bih.biYPelsPerMeter=0; B-^r0/y;
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _D~l2M
static int filecount=0; K&ZN!VN/p
CString name; } I>6 8dS[
name.Format("pict%04d.bmp",filecount++); m}A| W[p<
name=m_Path+name; TOapq9B]
BITMAPFILEHEADER bfh; -p.c8B
bfh.bfReserved1=bfh.bfReserved2=0; 6&|hpp#[
bfh.bfType=((WORD)('M'<< 8)|'B'); Y`F) UwKK
bfh.bfSize=54+size; $B%wK`J
bfh.bfOffBits=54; QO2@K1Y
CFile bf; (xpt_]Q!H
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ J^<Gi/:*^
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Drm#z05i[g
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RO+ jVY~H-
bf.WriteHuge(lpData,size); ~,ZU+
bf.Close();
P.bxq50
nCount++; JLd-{}A""-
} e}dGK=`
GlobalFreePtr(lpData); ,w`g+ 9v
if(nCount==1) >~@O\n-t
m_Number.Format("%d picture captured.",nCount); $7h]A$$Fv
else 4Vtug>
m_Number.Format("%d pictures captured.",nCount); Q^\m@7O
:
UpdateData(FALSE); _%g L
} P:D;w2'Q
aVB/CoM9
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $ UNC0(4
{ mtU{d^B
if(pMsg -> message == WM_KEYDOWN) Q g~cYwX
{ |RjAp.pm
if(pMsg -> wParam == VK_ESCAPE) L0l'4RRm\
return TRUE; ]K?;XA3 dZ
if(pMsg -> wParam == VK_RETURN) c wNJ{S+
return TRUE; >?<S(
} Tp46K\}Uf
return CDialog::PreTranslateMessage(pMsg); 8Q%g<jX*
} CvhVV"n
>$$z 6A[
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u9nJ;:
{ ai%*s&0/Y
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ . ;rE4B
SaveBmp(); P ~ :
N
return FALSE; d1P|v(
`S9
} Qb%o%z?hee
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (+yH
CMenu pop; 8Y4mTW
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); IR2=dQS
CMenu*pMenu=pop.GetSubMenu(0); BP4xXdG
pMenu->SetDefaultItem(ID_EXITICON); fj|b;8_}l
CPoint pt; uMx6:
GetCursorPos(&pt); !"2S'oQKS
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); oyB
gF\
if(id==ID_EXITICON) }y%c.
DeleteIcon(); J>l?HK
else if(id==ID_EXIT) |v:oLgUdH
OnCancel(); xKR\w!+Z'
return FALSE; *b'4>U
} C@`rg ILc
LRESULT res= CDialog::WindowProc(message, wParam, lParam); e Fh7#~m
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6Hbu7r*tm
AddIcon(); InI>So%e|<
return res; 3v@h&7<E
} }u9#S
?g\emhG
void CCaptureDlg::AddIcon() Nq9\ 2p
{ Rh}}8 sv
NOTIFYICONDATA data; HYg! <y
data.cbSize=sizeof(NOTIFYICONDATA); h1t~hrq
CString tip; C. BlB
tip.LoadString(IDS_ICONTIP); 2HUw^ *3
data.hIcon=GetIcon(0); }?\^^v h7
data.hWnd=GetSafeHwnd(); 8.,d`~
strcpy(data.szTip,tip); P_4E<"eK
data.uCallbackMessage=IDM_SHELL; ,,SV@y;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; hK,a8%KnFA
data.uID=98; 5cGQ `l
Shell_NotifyIcon(NIM_ADD,&data); FnKC|X
ShowWindow(SW_HIDE); #f [}a
bTray=TRUE; t"zi'9$t
} 4O{G^;
!&xci})7a
void CCaptureDlg::DeleteIcon() qJ sH
{ U9ZuD40\
NOTIFYICONDATA data; It7R}0Smg
data.cbSize=sizeof(NOTIFYICONDATA); X n8&&w"
data.hWnd=GetSafeHwnd(); jDb"|l
data.uID=98; Jz}`-fU`
Shell_NotifyIcon(NIM_DELETE,&data); VKkvf"X
ShowWindow(SW_SHOW); QM![tZt%;
SetForegroundWindow(); o\F>K'
ShowWindow(SW_SHOWNORMAL); B0U(B\~Y
bTray=FALSE; Bn9#F#F<
} m]vS"AdX
X% )~i[_DV
void CCaptureDlg::OnChange() hq&|
{ @DIEENiM
RegisterHotkey(); #dKy{Q3he
} RIQ-mpg~(k
eF]8Ar1
BOOL CCaptureDlg::RegisterHotkey() R#T
6]
{ EK=
y!>
UpdateData(); [UXN=
76N
UCHAR mask=0; T/A2Y+@N;
UCHAR key=0; 2"HTD|yy
if(m_bControl) ZNne 8
mask|=4; 4(*PM&'R
if(m_bAlt) )Gavjj&uJ
mask|=2; DuNindo8
if(m_bShift)
99.F'Gz
mask|=1; YA@MLZm
key=Key_Table[m_Key.GetCurSel()]; c7~R0nP
if(bRegistered){ cnS;9=,&
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8\"Gs z
bRegistered=FALSE; Y)DAR83
} a2Nxpxho
cMask=mask; WW.@S5
cKey=key; L2+cVR
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y>.t[*zT
return bRegistered; ;DSH$'1i
} n\)1Bz
<}:` Y"
四、小结 z3]W #
d!w3LwZ
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。