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:
S!`4Bl
clPZd 一、实现方法
]be0I) gJ)h9e*m^ 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:
'sT}DX(7M MEdIw#P.}{ #pragma data_seg("shareddata")
\NvC
HHOOK hHook =NULL; //钩子句柄
n?<#
{$ UINT nHookCount =0; //挂接的程序数目
J4Q)`Y\~ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
ECmHy@( static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Zi[{\7a static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
wiK@o$S- static int KeyCount =0;
mh!N^[=n static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
g:~?U*f- #pragma data_seg()
ZNL;8sI?> H{Y5YTg] 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
r{Qs9 #Tgz,e9 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
[0**&.obz jm#F*F vL BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
teQaHe# cKey,UCHAR cMask)
.g(\B {
Pq[0vZ_}dN BOOL bAdded=FALSE;
NIWI6qCw for(int index=0;index<MAX_KEY;index++){
]ut-wqb{p if(hCallWnd[index]==0){
i5>J hCallWnd[index]=hWnd;
E7Gi6w~\ HotKey[index]=cKey;
%>I?'y^ HotKeyMask[index]=cMask;
c'TiWZP~ bAdded=TRUE;
Y*5@|Q KeyCount++;
M&}oat* break;
_!$Up }
Z;"4$@|qE }
^w&5@3d return bAdded;
O3<Y _I^ }
eaYkYuS/ //删除热键
^J#*n;OQ3A BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ht=6P) {
?hry=I(7r BOOL bRemoved=FALSE;
k^'d@1z;C for(int index=0;index<MAX_KEY;index++){
gN!E*@7 if(hCallWnd[index]==hWnd){
+ hyWo]nW0 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
yp^[]Mz= hCallWnd[index]=NULL;
.JD4gF2N HotKey[index]=0;
mER8>
< HotKeyMask[index]=0;
VFO&)E/- bRemoved=TRUE;
"t%1@b*u KeyCount--;
O0=,&=i break;
z6L>!= }
jr#g>7yM }
c9ov;Bw6S }
Q'Q72Fg return bRemoved;
q.,p6D }
Ls$g-k%c@Q &[W3e3Asra *k@0:a(> DLL中的钩子函数如下:
0]2B-o"kI HhY2`P8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
;f ;*Q>! {
p.TiTFu/ BOOL bProcessed=FALSE;
xP5mL3j if(HC_ACTION==nCode)
;+TF3av0zq {
g.`t!6Hc if((lParam&0xc0000000)==0xc0000000){// 有键松开
wCC~tuTpr switch(wParam)
:)+@qxTy {
)kY_"= d case VK_MENU:
23u1nU[0 MaskBits&=~ALTBIT;
BhE~k?$9 break;
# 1qVFU case VK_CONTROL:
D?*sdm9r` MaskBits&=~CTRLBIT;
wTMHoU*> break;
b0z{"
case VK_SHIFT:
eB/hyC1 MaskBits&=~SHIFTBIT;
W_f"Gk break;
"6*Kgf2G default: //judge the key and send message
qqom$H< break;
"ZJ1`R=Mj }
J:mu%N` for(int index=0;index<MAX_KEY;index++){
OCOO02Wq1 if(hCallWnd[index]==NULL)
mb*h73{{ continue;
+N(YR3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
i6g[E4nk {
3Ld ;zW SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
+{Vwz bProcessed=TRUE;
I$6
f.W }
:9rhv{6Wp }
ubN"(F:!-S }
SU#P.y18% else if((lParam&0xc000ffff)==1){ //有键按下
<
jocfTBk switch(wParam)
.^`a6>EQ)| {
,d [b"]Zy case VK_MENU:
/YugQ.>| l MaskBits|=ALTBIT;
}Cq9{0by?a break;
:'=~/GR case VK_CONTROL:
Dxa)7dA| MaskBits|=CTRLBIT;
vA7jZw break;
A2O_pbQti case VK_SHIFT:
"TH-A6v1 MaskBits|=SHIFTBIT;
O"s`-OM;n break;
^* /v,+01f default: //judge the key and send message
3W0E6H" break;
1~xn[acy }
{ d2f)ra. for(int index=0;index<MAX_KEY;index++){
|>o0d~s if(hCallWnd[index]==NULL)
v[yTk[zd0 continue;
^p- e if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<sWcS; x {
@tv];t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8hdAXWPn bProcessed=TRUE;
5vh"PlK`s }
ao";5m }
O]%m{afM }
";Ig%] if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
xP/1@6]_Je for(int index=0;index<MAX_KEY;index++){
6_&6'Vq if(hCallWnd[index]==NULL)
C7 &
6rUX continue;
[]N$;~R7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/HJ(Wt
q SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RnBmy^l" //lParam的意义可看MSDN中WM_KEYDOWN部分
Sp$x%p0 }
/%q9hI }
+D-+}&oW }
\F+o= return CallNextHookEx( hHook, nCode, wParam, lParam );
>La L!PnZ }
1q233QSW) =&*QT&e 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:
qL;T&h `=l{kBZT| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\A\yuJ= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
(R*jt,x zQj%ds: 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:
:iNAXy IweK!,:>dN LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
$Ex 9 {
zf;[nz if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
16> >4U:Y {
674oL, //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
d|?(c~ SaveBmp();
>8fz ?A return FALSE;
L9YwOSb. }
k| cI! …… //其它处理及默认处理
3(GrDO9^ }
yjFQk,A
2:5gMt \^( vlcy 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。
7 KdM>1! Q|H cg| 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。
/,@v"mE7c! E+c3KqM 二、编程步骤
z&vms Qu>zO !x 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";
rn5g+%jX*
UoS;!}l 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]XafFr6pe 0V,MDX}#_ 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;
HXV73rDA Di"9 M(6vf 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;
+2fJ @[kM1:G-F{ 5、 添加代码,编译运行程序。
NlEWm8u pD6g+Taj 三、程序代码
m^x\@!N:( q.b4m 'J ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
PXu<4VF #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
u`Qcw|R+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
pfQZ|*>lkb #if _MSC_VER > 1000
*|#JFy?c[ #pragma once
6F&]Mk]V8 #endif // _MSC_VER > 1000
/\$|D&e
#ifndef __AFXWIN_H__
-+_aL4. #error include 'stdafx.h' before including this file for PCH
xPJJ
!mY #endif
%s : #include "resource.h" // main symbols
6')SJ*|yS class CHookApp : public CWinApp
2:/MN2 {
5a|m}2IX public:
FRQ("6( CHookApp();
AG\852`1m // Overrides
[%,=0P} // ClassWizard generated virtual function overrides
skx=w<YO6] //{{AFX_VIRTUAL(CHookApp)
[K@!JY public:
wvaIgy%z virtual BOOL InitInstance();
{#M{~ virtual int ExitInstance();
A'-YwbY //}}AFX_VIRTUAL
&`Z)5Ww //{{AFX_MSG(CHookApp)
_"bvT?| // NOTE - the ClassWizard will add and remove member functions here.
E/P53CD // DO NOT EDIT what you see in these blocks of generated code !
?F!J@Xn5 //}}AFX_MSG
[Q_|6Di DECLARE_MESSAGE_MAP()
by<@Zwtf
};
;U3Vows LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
78~V/L;@S2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
iSLf: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
#&c;RPac!6 BOOL InitHotkey();
X&oy.Roo BOOL UnInit();
t\d;}@bl #endif
~EkGG
. vS__*}^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
C\@YH] #include "stdafx.h"
Y8'_5?+ 0 #include "hook.h"
Mf13@XEo #include <windowsx.h>
(MiOrzT #ifdef _DEBUG
%)ov,p| #define new DEBUG_NEW
sl O9H6< #undef THIS_FILE
'^3pF2lIw static char THIS_FILE[] = __FILE__;
q ? TI, #endif
Jd6Q 9~z# #define MAX_KEY 100
;OqLNfU3y #define CTRLBIT 0x04
.T wF]v #define ALTBIT 0x02
b=\3N3OX #define SHIFTBIT 0x01
n7.lF #pragma data_seg("shareddata")
Cy'W!qH HHOOK hHook =NULL;
<%uZwk># UINT nHookCount =0;
rWKLxK4oU static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
[z@RgDXv static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
.h^Ld,Chj static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
I19F\
L`4 static int KeyCount =0;
2czL 1Ci static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
abP?Dj& #pragma data_seg()
([o:_5/8I HINSTANCE hins;
]=<@G.[= void VerifyWindow();
vg1s5Yqk BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
,?~,"IQyi[ //{{AFX_MSG_MAP(CHookApp)
pR>QIZq<gT // NOTE - the ClassWizard will add and remove mapping macros here.
%~XJwy- // DO NOT EDIT what you see in these blocks of generated code!
|ema-pRC //}}AFX_MSG_MAP
,
)3+hnFY END_MESSAGE_MAP()
2dW-WHaM G)|HFcE CHookApp::CHookApp()
jF85bb$ {
5z]KkPQ // TODO: add construction code here,
=H?5fT^
// Place all significant initialization in InitInstance
oD1=} }
HOb\Hn|6jq qZ1PC> CHookApp theApp;
d0E5 ;3tQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
aJ;R8(*;\ {
Nx
z ,/d BOOL bProcessed=FALSE;
O4mWsr if(HC_ACTION==nCode)
vAxtNRS {
X]%4QIeS if((lParam&0xc0000000)==0xc0000000){// Key up
o;/F=Zp switch(wParam)
:8T@96]P {
U<byR!qLie case VK_MENU:
czi!q1<vg MaskBits&=~ALTBIT;
OZ9j3Q;a$ break;
Yr0i9Qow case VK_CONTROL:
I65GUX#DV MaskBits&=~CTRLBIT;
H8k| >4 break;
.W:], 5e case VK_SHIFT:
cu|q& MaskBits&=~SHIFTBIT;
1H@F>}DP break;
$R36`wk default: //judge the key and send message
`o'sp9_3 break;
;%9ZL[- }
[/]3:| for(int index=0;index<MAX_KEY;index++){
!Xce iQu if(hCallWnd[index]==NULL)
f2f$aZ continue;
jZyh if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z6pDQ^Ii {
/tP SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
1h{_v!X bProcessed=TRUE;
Yb/^Qk59 }
^>uGbhBp }
C.p*mO&N }
w=2X[V} else if((lParam&0xc000ffff)==1){ //Key down
w`:KexD+ switch(wParam)
.1M>KRSr, {
ePdzQsnVe case VK_MENU:
k Er7,c MaskBits|=ALTBIT;
:D-vE7 break;
4}j}8y2)H case VK_CONTROL:
5@5="lNjS MaskBits|=CTRLBIT;
yY|U}]u!V break;
LnIJw D case VK_SHIFT:
UkQocZdZ MaskBits|=SHIFTBIT;
FiL
JF! break;
#}?$mxME* default: //judge the key and send message
e@YR/I8my break;
dq&d>f1 }
GrIdQi^8 for(int index=0;index<MAX_KEY;index++)
_:
x$"i {
e&nw&9vo if(hCallWnd[index]==NULL)
),|bP`V continue;
IC~D?c0H: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
${3OQG {
L.[2l Q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
VtFh1FDI\ bProcessed=TRUE;
r?*?iw2g }
d~%Rnic6* }
E ..[F<5 }
g`8|jg0]`I if(!bProcessed){
E"!*ASN for(int index=0;index<MAX_KEY;index++){
$!lxVZ> if(hCallWnd[index]==NULL)
&*~
WK continue;
"zc!QHpSd if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Rwk|cqr SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
v-qS 'N4 }
dRmTE }
)vzT\dQ| }
@"0qS:s]X return CallNextHookEx( hHook, nCode, wParam, lParam );
aleIy}" }
i"@?eq#h V;=T~K|)> BOOL InitHotkey()
5E8PbV-l {
;?9~^,l if(hHook!=NULL){
g!UM8I-$
nHookCount++;
hz|$3*q return TRUE;
uOx$@1v, }
m? hX= else
ap!<8N hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!)]3@$# if(hHook!=NULL)
DJ.Ct4 nHookCount++;
4g9VE;Gd return (hHook!=NULL);
6(=:j"w0 }
TvR2lP BOOL UnInit()
8wd2\J,] {
gS ]'^Sr if(nHookCount>1){
),eiJblH nHookCount--;
$?YkgK return TRUE;
\I=:,cz*, }
+ h&V; BOOL unhooked = UnhookWindowsHookEx(hHook);
.^,vK7 if(unhooked==TRUE){
z?^p(UH nHookCount=0;
ORTM[cL
hHook=NULL;
_ev^5`>p/ }
I/l]Yv! return unhooked;
Z8W<RiR }
)_uK(UNZ5 7E'C o| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E {MSi" {
\<%a`IA!* BOOL bAdded=FALSE;
[+GG Wo for(int index=0;index<MAX_KEY;index++){
5P4>xv[ if(hCallWnd[index]==0){
w pvaTHo hCallWnd[index]=hWnd;
y[vjqfdmU HotKey[index]=cKey;
n3w2& HotKeyMask[index]=cMask;
;L7<mU bAdded=TRUE;
=}[V69a KeyCount++;
A`KTm( break;
y? g7sLDc }
E^!%m8-- }
d=pq+ return bAdded;
sC
j3 h }
-?[:Zn~$a (\T?p9 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;Baf&xK {
Tm `CA0@ BOOL bRemoved=FALSE;
0=04:.%D for(int index=0;index<MAX_KEY;index++){
=
~yh[@R) if(hCallWnd[index]==hWnd){
~kL":C>2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
G2rvi=8= hCallWnd[index]=NULL;
V2*b f`/V HotKey[index]=0;
bm^ou#]| HotKeyMask[index]=0;
C>H UG bRemoved=TRUE;
4%pvw;r KeyCount--;
*\>7@r[%5 break;
*KMCU
m }
P*}Oi7Z }
rRMC<.= }
vDemY"wz return bRemoved;
0y(d|;': }
`is6\RH k$zDofdfp void VerifyWindow()
C$_H)I {
h1"#DnK7 for(int i=0;i<MAX_KEY;i++){
'ySWf,Q^ if(hCallWnd
!=NULL){ ,^3D"Tky
if(!IsWindow(hCallWnd)){ 6^p6v
hCallWnd=NULL; +um;
eL7
HotKey=0; 82$^pg>
HotKeyMask=0; *{ .u\BL5
KeyCount--; hZy"@y3Yq
} l4; LV7Ji
} %n(
s;/_
} jE{z4en
} q>Y_I<;'g
nQ mkDPjU
BOOL CHookApp::InitInstance() *I~F7Z]|
{ e='3gzz
AFX_MANAGE_STATE(AfxGetStaticModuleState()); a*=e 3nS
hins=AfxGetInstanceHandle(); ,}NG@JID
InitHotkey(); k;%}%"EVZ
return CWinApp::InitInstance(); q+N}AKawB
} &B)
F_E I
i"-j:b:c<
int CHookApp::ExitInstance() -Iq#h)Q*
{ twJck~l~n
VerifyWindow(); Ys\l[$_`*
UnInit(); } nQHP4'
return CWinApp::ExitInstance(); %K zURv
} 7|2:;5:U
re<"%D
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9Y7 tI3
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /%.K`BMN
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Y.-i ;Mmu
#if _MSC_VER > 1000 c;j]/R$i
#pragma once <4Ak$E%"
#endif // _MSC_VER > 1000 !a0HF p$9
U_w)*)F
class CCaptureDlg : public CDialog ': HV9]k
{ mCg 5-E~;
// Construction '0[l'Dt'
public: y&iLhd!p
BOOL bTray; X'0A"9
BOOL bRegistered; Bq'hk<ns[
BOOL RegisterHotkey(); FrB19
UCHAR cKey; Rq;R{a
UCHAR cMask; p.zU9rID
void DeleteIcon(); &fW;;>
void AddIcon(); l9n8v\8,o
UINT nCount; &4]%&mX)-
void SaveBmp(); fz:F*zT1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor K\ZKVn
// Dialog Data .[~E}O
//{{AFX_DATA(CCaptureDlg) ^b&aDm~(7
enum { IDD = IDD_CAPTURE_DIALOG }; 7%aB>uA
CComboBox m_Key; :qI myaGQ
BOOL m_bControl; 9!o:)99U
BOOL m_bAlt; keX0br7u_
BOOL m_bShift; ~=}56yxl[
CString m_Path; +^`c"qJo
CString m_Number; a-hF/~84S:
//}}AFX_DATA <n0-zCf
// ClassWizard generated virtual function overrides ~fr1O`8
//{{AFX_VIRTUAL(CCaptureDlg) i<-#yL5
public: P4s:wuJ^
virtual BOOL PreTranslateMessage(MSG* pMsg); 4/HyO\?z5
protected: n`CmbM@@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support eqXW|,zUm
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); j'~xe3j
//}}AFX_VIRTUAL GAQVeL1
// Implementation N@*v'MEko%
protected: E-l>z%
HICON m_hIcon; ;IwC`!(#
// Generated message map functions O75ioO0
//{{AFX_MSG(CCaptureDlg) }Vg&9HY
virtual BOOL OnInitDialog(); e-x{7
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \\BblzGMR
afx_msg void OnPaint(); 1Hzj-u&N/
afx_msg HCURSOR OnQueryDragIcon(); Lk`0z
virtual void OnCancel(); cLX~NPD/
afx_msg void OnAbout(); /SSl$
afx_msg void OnBrowse(); Hz28L$
afx_msg void OnChange(); UtY<R
//}}AFX_MSG Ktg6 *L/
DECLARE_MESSAGE_MAP() )J5(M`
}; J/=b1{d"n
#endif vcqL
Gh|q[s*k
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i $#bg^
#include "stdafx.h" 9CW .xX8
#include "Capture.h" .DIHd/wA
#include "CaptureDlg.h" V&[|%jm&
#include <windowsx.h> X`[or:cB
#pragma comment(lib,"hook.lib") k'EP->r
#ifdef _DEBUG Z-Zox-I1}-
#define new DEBUG_NEW ,253'53W)
#undef THIS_FILE JoIffI?{(D
static char THIS_FILE[] = __FILE__; ^\J/l\n
#endif E2 #XXc
#define IDM_SHELL WM_USER+1 XP~4jOL]
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s:,BcVLx^
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y[@$1{YS
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m8#+w0p)
class CAboutDlg : public CDialog nQb{/ TqC'
{ Tj@s \@hv
public: pb6z)8
CAboutDlg(); `TBau:E lI
// Dialog Data 6E85mfFS
//{{AFX_DATA(CAboutDlg) x~Y]c"'D
enum { IDD = IDD_ABOUTBOX }; #|xK>;
//}}AFX_DATA d%\en&:la
// ClassWizard generated virtual function overrides d 6j'[
//{{AFX_VIRTUAL(CAboutDlg) 4ijoAW3A^
protected: cea%M3
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8?J\
//}}AFX_VIRTUAL yIOoVi\m
// Implementation G"3D"7fa
protected: U_B"B;ng+
//{{AFX_MSG(CAboutDlg) S3A OT
//}}AFX_MSG Ks7DoXCvE
DECLARE_MESSAGE_MAP() {H=DeQ
}; l0l2fwz(
WfL5.&
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R=_
fk
{ BMgiXdv.B
//{{AFX_DATA_INIT(CAboutDlg) ~f;d3dJ]/
//}}AFX_DATA_INIT 58ev (f
} "O!J6
$
nx&(V
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;n?H/(6X8>
{ E}00y%@*J
CDialog::DoDataExchange(pDX); cL?FloPc*
//{{AFX_DATA_MAP(CAboutDlg) 8%@7G*
//}}AFX_DATA_MAP ZEiW\ V
} S8TJnv`?'
]9pK^<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $2~I-[
//{{AFX_MSG_MAP(CAboutDlg) #"jEc*&=
// No message handlers ckHHD|
//}}AFX_MSG_MAP h}nceH0s3d
END_MESSAGE_MAP() 8F9sKRq|rO
4en[!*
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]hJ#%1
: CDialog(CCaptureDlg::IDD, pParent) NnRR"'
{ )`, Bt
//{{AFX_DATA_INIT(CCaptureDlg) ou0(C`
m_bControl = FALSE; F]:@?}8R
m_bAlt = FALSE; Ml@,xJ/aia
m_bShift = FALSE; /4}{SE
m_Path = _T("c:\\"); 07:CcT
m_Number = _T("0 picture captured."); oj/,vO:QT
nCount=0; _VFl.U,
bRegistered=FALSE; 0O5(\8jM
bTray=FALSE; sG!SSRL@
//}}AFX_DATA_INIT K&0'@#bE\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \#?n'qyj
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !yI , ~`Z
} NifzZEX
]>M{Qn*
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tsaf|xe
{ ^rO3B?_
CDialog::DoDataExchange(pDX); 0pYO-@E
//{{AFX_DATA_MAP(CCaptureDlg) eo.y,U h
DDX_Control(pDX, IDC_KEY, m_Key); 38ChS.(
DDX_Check(pDX, IDC_CONTROL, m_bControl); %9cu(yc*}
DDX_Check(pDX, IDC_ALT, m_bAlt); 8q58H[/c
DDX_Check(pDX, IDC_SHIFT, m_bShift); Oc8]A=M12
DDX_Text(pDX, IDC_PATH, m_Path); r+r-[z D(
DDX_Text(pDX, IDC_NUMBER, m_Number); kmXpj3
//}}AFX_DATA_MAP xXp$Nm]:
} ckY,6e"6
(qG |.a
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) PQ9.aJdw@-
//{{AFX_MSG_MAP(CCaptureDlg) p~1!O]qLt
ON_WM_SYSCOMMAND() +KGZk?%
ON_WM_PAINT() #+I)<a7\
ON_WM_QUERYDRAGICON() zkHwoAD;t8
ON_BN_CLICKED(ID_ABOUT, OnAbout) +nU"P
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J{<,V\t)
ON_BN_CLICKED(ID_CHANGE, OnChange)
KV v0bE
//}}AFX_MSG_MAP
>G(M&
END_MESSAGE_MAP() n#8N{ya5x1
w7GF,a
BOOL CCaptureDlg::OnInitDialog()
;j|T#-.
{ _1TSt%L
CDialog::OnInitDialog(); sq1Z;l31"
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); a"ZBSg(
ASSERT(IDM_ABOUTBOX < 0xF000); -L<''2t
CMenu* pSysMenu = GetSystemMenu(FALSE); f4eLnY
if (pSysMenu != NULL) A14}
{ Hyx%FN=
CString strAboutMenu; &.~Xl:lq
strAboutMenu.LoadString(IDS_ABOUTBOX); =
zJY5@^'7
if (!strAboutMenu.IsEmpty()) ME4Ir
{ t_%6,?S6
pSysMenu->AppendMenu(MF_SEPARATOR); MDI[TNYG
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); rWzw7T~
} 1<g,1TR
} ~`-z"zM:p
SetIcon(m_hIcon, TRUE); // Set big icon g|L" |Q
SetIcon(m_hIcon, FALSE); // Set small icon J}a 8N.S
m_Key.SetCurSel(0); 46^LPC"x
RegisterHotkey(); S^ij %
CMenu* pMenu=GetSystemMenu(FALSE); ZtG5vdf
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 94Wf ]
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); rN* ,U\q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H%2Y8}
return TRUE; // return TRUE unless you set the focus to a control )Nv$ SH
} f~nAJ+m=
q):Ph&'r
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,I# X[^/
{ ~Mu=,OT
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Byq4PX%B
{ Pt<lHfd
CAboutDlg dlgAbout; 5R6@A?vr
dlgAbout.DoModal(); ^D`ARH
} QQ*yQ\
else E5@U~|V[
{ Id-?her>B
CDialog::OnSysCommand(nID, lParam);
wbg_%h:
} m<]b]FQ
}
--Dd'
v}w=I}<x
void CCaptureDlg::OnPaint() ^]Mlkd:
{ n$>E'oG2t
if (IsIconic()) z=q
{ h!#!}|Q'
CPaintDC dc(this); // device context for painting W
'54g$T
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Zr!he$8(2
// Center icon in client rectangle 5G-)>
int cxIcon = GetSystemMetrics(SM_CXICON); 6uWzv~!*D
int cyIcon = GetSystemMetrics(SM_CYICON); 7|=*z
CRect rect; L\p@1N?K
GetClientRect(&rect); sR%,l
int x = (rect.Width() - cxIcon + 1) / 2; Gp6|0:2,L~
int y = (rect.Height() - cyIcon + 1) / 2; WR;"^<i9
// Draw the icon ?9<byEO%M
dc.DrawIcon(x, y, m_hIcon); 5$SO
} 8p3pw=p
else 6fxf|R\
{ ,]ALyWGuX
CDialog::OnPaint(); ]A*v\Qy
} +jk_tPSe
} +/idq
G[U'-a}I
HCURSOR CCaptureDlg::OnQueryDragIcon() (bP\_F5D
{ {.
r/tV5IH
return (HCURSOR) m_hIcon; Z$h39hm?c
} K<`"Sr
1EW-%GQO
void CCaptureDlg::OnCancel() 'IrwlS
{ [&mYW.O<
if(bTray) "WKE%f
DeleteIcon(); @C),-TM
CDialog::OnCancel(); @=jcdn!\M
} EFl[u+
1tx
8YI.f
void CCaptureDlg::OnAbout() 1zE_ SNx
{ x)@G+I\u
CAboutDlg dlg; ,"/<N*vh
dlg.DoModal(); maANxSzi
} m9^?p
]1]
void CCaptureDlg::OnBrowse() A/NwM1z[o)
{ -CW$p=y}
CString str; Q"]C"?
BROWSEINFO bi; uQ9/ 7"S
char name[MAX_PATH]; `m5cU*@D
ZeroMemory(&bi,sizeof(BROWSEINFO)); >iP>v`J
bi.hwndOwner=GetSafeHwnd(); 5gq3 >qo
bi.pszDisplayName=name; tR#uDE\wR
bi.lpszTitle="Select folder"; x9PEYhL?
bi.ulFlags=BIF_RETURNONLYFSDIRS; 1 sCF
-r
LPITEMIDLIST idl=SHBrowseForFolder(&bi); LQYT/
if(idl==NULL) x@bZ((w
return; BY:
cSqAW
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6USet`#
str.ReleaseBuffer(); Ch
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m_Path=str; Dbr(Wg
if(str.GetAt(str.GetLength()-1)!='\\') {:
EQ
m_Path+="\\"; j#%*@]>Tg
UpdateData(FALSE); |::kC3=
} DC`6g#*<
hD58 s"L$
void CCaptureDlg::SaveBmp() \~nUk7.
{ 9&}qie,
CDC dc; 9a)D8
dc.CreateDC("DISPLAY",NULL,NULL,NULL); &eY$(o-Hw
CBitmap bm; 9!V<=0b/
int Width=GetSystemMetrics(SM_CXSCREEN); V]}/e!XK\
int Height=GetSystemMetrics(SM_CYSCREEN); #UU}lG
bm.CreateCompatibleBitmap(&dc,Width,Height); >'^l>FPc
CDC tdc; X %,;IW]a
tdc.CreateCompatibleDC(&dc); URR|Q!D
CBitmap*pOld=tdc.SelectObject(&bm); O3*Vilx
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -tx)7KV-
tdc.SelectObject(pOld); +XWXHt
BITMAP btm; s4SR6hBO
bm.GetBitmap(&btm); ]8YHA}P
DWORD size=btm.bmWidthBytes*btm.bmHeight; #.}Su+XF
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l)VMF44
BITMAPINFOHEADER bih; 8%7H
F:
bih.biBitCount=btm.bmBitsPixel; >C_! }~
bih.biClrImportant=0; "DWw1{ 5/
bih.biClrUsed=0; A@'):V8_%C
bih.biCompression=0; k`
(_~/#
bih.biHeight=btm.bmHeight; 0e8)*2S
bih.biPlanes=1; . 36'=K
bih.biSize=sizeof(BITMAPINFOHEADER); z!Jce}mx
bih.biSizeImage=size; +cy(}Vp
bih.biWidth=btm.bmWidth; biGaP#"0
bih.biXPelsPerMeter=0; e~rBV+f
bih.biYPelsPerMeter=0; & PHHacp
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u[ 2R>=
static int filecount=0; ? dSrY
CString name; B5B'H3@
name.Format("pict%04d.bmp",filecount++); XNu2G19jb
name=m_Path+name; R52q6y:<x
BITMAPFILEHEADER bfh; cx_"{`+e
bfh.bfReserved1=bfh.bfReserved2=0; !;CY
@=
bfh.bfType=((WORD)('M'<< 8)|'B'); $
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bfh.bfSize=54+size; Y/Y746I
bfh.bfOffBits=54; +<
BAJWU
CFile bf; 'zT/x`V
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |7%$+g
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); f.+e
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Hg(\EEe
bf.WriteHuge(lpData,size); d2X#_(+d
bf.Close(); wK#UFOp
nCount++; jIdhmd* $z
} VdK-2O(.-
GlobalFreePtr(lpData); Y,E:?
if(nCount==1) ?wwY8e?S
m_Number.Format("%d picture captured.",nCount); k_}ICKzw1
else PI0/=kS
m_Number.Format("%d pictures captured.",nCount); B)^]V<l(w
UpdateData(FALSE); {8I93]
} $$qhX]^~
gn(n</\/O
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) yxA0#6so
{ uvA}7L{UO
if(pMsg -> message == WM_KEYDOWN) $g|g}>Sc
{ @~gz-l^$
if(pMsg -> wParam == VK_ESCAPE) wRie{Vk
return TRUE; j<L!ONvJ1
if(pMsg -> wParam == VK_RETURN) UhEJznfi
return TRUE; &x=<>~Ag3
} ,hOJe=u46
return CDialog::PreTranslateMessage(pMsg); 7?hCt
} ?on3z
b$gDFNa
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S%%>&^5
{ CB|z{(&N
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ FP9ZOo og
SaveBmp(); ]i$CE|~
return FALSE; J::SFu=
} NU
6P
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 'Z&A5\~
CMenu pop; ?=4J
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *jW$AH
CMenu*pMenu=pop.GetSubMenu(0); +Tu:zCv.
pMenu->SetDefaultItem(ID_EXITICON); -@#AQ\
CPoint pt; 9U;) [R Mb
GetCursorPos(&pt); R`$Odplh>
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); LQ{4r1,u]
if(id==ID_EXITICON) 45-pJf8F
DeleteIcon(); yr;oq(&N
else if(id==ID_EXIT) O9>/WmLe
OnCancel(); TUk1h\.q
return FALSE; j
f^fj-
} o^AK@\e:^Z
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cc^V~-ph
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \{~x<<qFd
AddIcon(); %
mIq,
return res; 6xj&Qo
} fitm*
!A<?nz
Uv
void CCaptureDlg::AddIcon() !J6k\$r
{ K):)bL(B
NOTIFYICONDATA data; ZsV'-gu
data.cbSize=sizeof(NOTIFYICONDATA); ]7br*t^zv
CString tip; i-/'F
tip.LoadString(IDS_ICONTIP); U1&m-K
data.hIcon=GetIcon(0); Z~P5SEg
data.hWnd=GetSafeHwnd(); |:EUh
strcpy(data.szTip,tip); m$$U%=r>@
data.uCallbackMessage=IDM_SHELL; h7%<
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7qnw.7p
data.uID=98; ,':?3| $c
Shell_NotifyIcon(NIM_ADD,&data); rgOB0[
ShowWindow(SW_HIDE); sM-k,0z
bTray=TRUE; ousoG$Pc
} G2e m>W_n
t4 aa5@r
void CCaptureDlg::DeleteIcon() $)PNf'5Zg
{ OvQG%D}P=
NOTIFYICONDATA data; a7M8sZ?"
data.cbSize=sizeof(NOTIFYICONDATA); JZai{0se
data.hWnd=GetSafeHwnd(); /oh[Nu1D
data.uID=98; RX#:27:
Shell_NotifyIcon(NIM_DELETE,&data); jgukW7H
ShowWindow(SW_SHOW); AC
3 ;i
SetForegroundWindow(); i\N,4Fdor
ShowWindow(SW_SHOWNORMAL); y5oiH
bTray=FALSE; O~igwFe
} H!7/U_AH
C~kw{g+|
void CCaptureDlg::OnChange() ?n[+0a:8E
{ \GBv@
RegisterHotkey(); W${0#qq
} 5J1,Usm
_W&.{
7
BOOL CCaptureDlg::RegisterHotkey() \ocJJc9
{ ~|+
UpdateData(); 0urQA_JC
UCHAR mask=0; 91[(K'=&
UCHAR key=0; z!?xz
if(m_bControl) *\-6p0~A
mask|=4; %~G)xK?W*
if(m_bAlt) 02?y%
mask|=2; 4fQ<A <2/
if(m_bShift) kOeW,:&65
mask|=1; FzW7MW>\x
key=Key_Table[m_Key.GetCurSel()]; l2z@t3{
if(bRegistered){ uBH4E;[f
DeleteHotkey(GetSafeHwnd(),cKey,cMask); P;][i| x
bRegistered=FALSE;
qN[U|3k
} V+-%$-w>
cMask=mask; Jro)
cKey=key; f6u<.b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); z'j4^Xz?%$
return bRegistered; bRfac/:}
} <V>]-bl/
Z`T]jm-3
四、小结 ^e1@o\]
cY0NQKUk~
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。