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:
m 'H
V.a]IkK'K 一、实现方法
'14l )1g. jv#" vQ9A] 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:
ht74h *d,n2a#n5 #pragma data_seg("shareddata")
ADl>~3b HHOOK hHook =NULL; //钩子句柄
E#X!*q& UINT nHookCount =0; //挂接的程序数目
WSB|-Qj}W static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
M(]|}% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
n)?F
9Wap static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
o?
xR[N-J static int KeyCount =0;
bHH}x"d[x static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
!.GY~f<d$ #pragma data_seg()
Q,qylL O/r<VTOp 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。
qx<zX\qI6n nF[eb{GR` 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:
+7vh_ _ GC#95 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
:tDGNz*zG cKey,UCHAR cMask)
xXh]z| {
z^GGJu%vjr BOOL bAdded=FALSE;
(i~%4w= for(int index=0;index<MAX_KEY;index++){
:Y?08/V if(hCallWnd[index]==0){
DmpJzHj| hCallWnd[index]=hWnd;
owVUL~ HotKey[index]=cKey;
_
~$0cj< HotKeyMask[index]=cMask;
4a-F4j' bAdded=TRUE;
>v4~:n2D KeyCount++;
X1~A "sW[ break;
xMGd'l? }
{1&,6kJF&9 }
dz.MH return bAdded;
X
OtS+p }
Xwq2;Bq //删除热键
?#y<^oNM BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.4)P=* {
WW/m
/+ BOOL bRemoved=FALSE;
6Kc7@oO~ for(int index=0;index<MAX_KEY;index++){
8l,hP . if(hCallWnd[index]==hWnd){
",@g if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
AhZ hCallWnd[index]=NULL;
lMf5F8 HotKey[index]=0;
qO'5*d;!d HotKeyMask[index]=0;
b#'a4j-u bRemoved=TRUE;
H;te)km} KeyCount--;
W n mRRq^ break;
Z- Ae'ym }
.Bn2;nO }
Q$5:P& }
}u)GERWO return bRemoved;
4f~ZY]|nM }
pjn%CR`; Pz!yIj #i U/Yg! DLL中的钩子函数如下:
~"B[6^sW _$lQK{@rY LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>#|Q,hVU5 {
LA Vgf> BOOL bProcessed=FALSE;
(3*Hl if(HC_ACTION==nCode)
KO"iauW {
?P]md9$(+e if((lParam&0xc0000000)==0xc0000000){// 有键松开
RuuU}XQ switch(wParam)
VX%\_@ {
bGa":|}F case VK_MENU:
^;_b!7* MaskBits&=~ALTBIT;
e.H"!X!0#H break;
@vh>GiR){ case VK_CONTROL:
/q]@|5I MaskBits&=~CTRLBIT;
%>z}P&Yz break;
xFnMXht case VK_SHIFT:
B9-=.2.WU MaskBits&=~SHIFTBIT;
nQ6'yd" break;
ugP R)tDfM default: //judge the key and send message
?A>-_B break;
*k$&Hcr$ }
i9"1 for(int index=0;index<MAX_KEY;index++){
\_'pUp22 if(hCallWnd[index]==NULL)
9-SXu lgu continue;
&YMj\KmlSg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
uuB\~ #?T {
\I]'6N= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
p}uw-$O bProcessed=TRUE;
(*tJCz`Sj }
UW3F) }
)]R8
$S }
8uiQm;W else if((lParam&0xc000ffff)==1){ //有键按下
4|thDb)] switch(wParam)
ovO^uWz` {
'fsOKx4Z case VK_MENU:
q?\D9aT9 MaskBits|=ALTBIT;
6qf`P!7d]M break;
@pz2}Hd| case VK_CONTROL:
v/dcb% MaskBits|=CTRLBIT;
b"b!&u break;
3u<2~!sR case VK_SHIFT:
jF8ld5|_| MaskBits|=SHIFTBIT;
?1sY S break;
k6\c^%x default: //judge the key and send message
kE}?"<l break;
F(r&:3!97 }
u9Ro=#xt for(int index=0;index<MAX_KEY;index++){
iatQHn>( if(hCallWnd[index]==NULL)
7=9jXNk Y continue;
"( xu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0OXd* {
4M}/PoJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>e%Po,Fg$ bProcessed=TRUE;
JYq} YG=% }
nYY U }
y- YYDEl }
9w1)Mf} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
)XFMlSx) for(int index=0;index<MAX_KEY;index++){
V#gXchH[L if(hCallWnd[index]==NULL)
Sl1N V continue;
'J}lnt[V if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&oBJY'1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:L,]<n //lParam的意义可看MSDN中WM_KEYDOWN部分
O7W}Z1G }
X'Oo ogu }
!?96P|G }
%zGPF return CallNextHookEx( hHook, nCode, wParam, lParam );
kI]1J }
W!g
, N{'k
]& 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:
q:(K^ "F^EfpcJ{9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;Zw28!#Rt BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
b$BUo8O} qQb8K+ t 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
#Xc~3rg9 ^0 t`EZ$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
oq|K:<l {
JO$0Z if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
9X-DR {
8w\&QX //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
?h5Y^}8Qg SaveBmp();
#(7OvW+y return FALSE;
ji1A>jepF }
Y=5hm …… //其它处理及默认处理
Ruf*aF( }
\(u P{,ML N.fIg ALG + 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。
vt1!|2{
h I;No++N0 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。
z\\MLyS -+z^{*\;N 二、编程步骤
bv+PbK]iO Q>|<R[.7 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";
p4/D%*G^` 2JbCYCTC 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
uQ{M<%K Y,+$vj:y8 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
s}5;)>3~@ J~~WV<6 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Ts.61Rx 7{p,<Uz<"U 5、 添加代码,编译运行程序。
c+q4sNnE \KTX{qI"f 三、程序代码
Cjw|.c` PJ);d>tz ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
rK"x92P0 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
-&+[/ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
WzF/wzR #if _MSC_VER > 1000
/W fpA\4S #pragma once
\h :$q E7 #endif // _MSC_VER > 1000
#Hq XC\~n #ifndef __AFXWIN_H__
7%C6gU!r #error include 'stdafx.h' before including this file for PCH
L9@nx7D #endif
^W;\faG #include "resource.h" // main symbols
E<0Y;tR class CHookApp : public CWinApp
tX)^$3A {
e~xN[Q\0] public:
BjSLbw-C CHookApp();
dtJ?J<m} // Overrides
1a`dB
~> // ClassWizard generated virtual function overrides
n%A)#AGGc //{{AFX_VIRTUAL(CHookApp)
wgY:W:y'N public:
2Lm.;l4YO virtual BOOL InitInstance();
[$$i1%c%Z< virtual int ExitInstance();
ht)J#Di //}}AFX_VIRTUAL
|pA3ZWm //{{AFX_MSG(CHookApp)
,-D3tleu` // NOTE - the ClassWizard will add and remove member functions here.
T=%,^ // DO NOT EDIT what you see in these blocks of generated code !
`5:b=^'D/ //}}AFX_MSG
C`Zz\DNG@ DECLARE_MESSAGE_MAP()
rjz$~(&m6 };
)k$ +T% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
/d*d'3{c BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
IBZ_xU\2 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
'a[|' BOOL InitHotkey();
E0G"B'x BOOL UnInit();
4J{6Wt"; #endif
vL}e1V: GUSEbIz): //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
NH~\kV #include "stdafx.h"
H[S[ y #include "hook.h"
5o2w)<d! #include <windowsx.h>
x}B3h9] #ifdef _DEBUG
u7L&cx #define new DEBUG_NEW
Cl&YN}t5 #undef THIS_FILE
"n'kv!?\ static char THIS_FILE[] = __FILE__;
UU'0WIbY6 #endif
n<3qr}ZG^ #define MAX_KEY 100
ip8%9fG\> #define CTRLBIT 0x04
VUmf;~ #define ALTBIT 0x02
:J6 xYy$ #define SHIFTBIT 0x01
j]P'xrWl]8 #pragma data_seg("shareddata")
x,L<{A`z HHOOK hHook =NULL;
*!NxtB!LC UINT nHookCount =0;
$Y`oqw?g+^ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
(P'{A>aHl0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
p4-UW;Xu static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
5Q7Z$A1a
9 static int KeyCount =0;
?`hA :X< static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
'-X[T} #pragma data_seg()
YpJJ]Rszg HINSTANCE hins;
q]Vxf!0*> void VerifyWindow();
'Y2ImSWj BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
g|TWoRx: //{{AFX_MSG_MAP(CHookApp)
z_f^L %J0 // NOTE - the ClassWizard will add and remove mapping macros here.
f*o+g:]3 // DO NOT EDIT what you see in these blocks of generated code!
?mwa6] //}}AFX_MSG_MAP
/L{V3}[j END_MESSAGE_MAP()
WF] |-)vw -kzp>= CHookApp::CHookApp()
j[CXIz?c {
cS#yfN, // TODO: add construction code here,
0hg4y // Place all significant initialization in InitInstance
8Wba Hw_ }
56o(gCj?y PCx: CHookApp theApp;
Q@ua
G,6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
hh!4DHv {
X4eoE BOOL bProcessed=FALSE;
d k/f_m if(HC_ACTION==nCode)
G4rd<V0[D {
(}m2} if((lParam&0xc0000000)==0xc0000000){// Key up
[nA1WFfM switch(wParam)
(T!#7 {
x7GYWK
9 case VK_MENU:
@d|3c7` A MaskBits&=~ALTBIT;
TXT!Ae break;
&6e A. case VK_CONTROL:
|@5G\N - MaskBits&=~CTRLBIT;
.WLwAL break;
_1G;!eO case VK_SHIFT:
oP~%7Jt MaskBits&=~SHIFTBIT;
H1c>3c break;
068DC_ default: //judge the key and send message
+,]_TxL|C break;
bgeJVI }
Qe =8x7oIP for(int index=0;index<MAX_KEY;index++){
^+w1:C 5 if(hCallWnd[index]==NULL)
.On3ZN continue;
3"Zc|Ck <? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[]doLt;J {
5(thDZ ! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
vRb7=fXf bProcessed=TRUE;
iUbcvF3aP }
Q!5W x }
eus@;l* }
5?A<('2 else if((lParam&0xc000ffff)==1){ //Key down
O03F@v switch(wParam)
q'9; {
d ATAH}r& case VK_MENU:
XVF!l>nE MaskBits|=ALTBIT;
FqZD'Uu7 break;
1,Jy+1G0w case VK_CONTROL:
jX.'G MaskBits|=CTRLBIT;
1:RK~_E break;
f\FqZ?w case VK_SHIFT:
Z+=WICI/2 MaskBits|=SHIFTBIT;
qOAP_\@T break;
MP_/eC ; default: //judge the key and send message
#r,!-;^'p break;
h1y3gl[;TD }
tkmzOc H for(int index=0;index<MAX_KEY;index++)
p0D@O_
:5 {
vuZ'Wo:S{ if(hCallWnd[index]==NULL)
b'I@TLE') continue;
>3,}^`l if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(Vn3g ra {
nchpD@'t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
*uSlp_;kB bProcessed=TRUE;
If8Lt}- }
Xy}>O* }
2*V]jO }
8K@e8p( y if(!bProcessed){
t qUBl?i for(int index=0;index<MAX_KEY;index++){
<nK@+4EH"o if(hCallWnd[index]==NULL)
#=72/[ continue;
R2Lq??XA= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
pU<GI@gU SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
efuiFN; }
I+`>e*:@W }
M,cz7, }
T+S\'f\ return CallNextHookEx( hHook, nCode, wParam, lParam );
eep/96G
? }
b>9?gmR{ =@&>r5W1 BOOL InitHotkey()
4pZKm-dM^ {
>p`i6_P0P/ if(hHook!=NULL){
c[;A$P=
8. nHookCount++;
rCb$^(w{7 return TRUE;
{E}D6`{ }
o}D
}Q"=A else
2@Q5Ta#h hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
7<(kvE*x if(hHook!=NULL)
9ph>4u(R nHookCount++;
9Z"WV5o return (hHook!=NULL);
=$ T[ }
U lCw{:#F BOOL UnInit()
y3bL\d1 {
e;LC\*dG if(nHookCount>1){
mE'HRv nHookCount--;
,s6lB0 return TRUE;
sn
Ou }
:f7:@8 BOOL unhooked = UnhookWindowsHookEx(hHook);
sxdDI?W4 if(unhooked==TRUE){
aCi)icn$ nHookCount=0;
K,+z^{Hvh hHook=NULL;
-
^Y\'y2 }
.bRtK+}F# return unhooked;
E_P,>f }
b?2 \j} nITkgN:s BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`=kiqF2P} {
F>?~4y,b7 BOOL bAdded=FALSE;
_`Y%Y6O1/ for(int index=0;index<MAX_KEY;index++){
e@5w?QzW if(hCallWnd[index]==0){
:bCswgd[ hCallWnd[index]=hWnd;
F3 g$b,RMH HotKey[index]=cKey;
#MviO!@ HotKeyMask[index]=cMask;
@PK
1 bAdded=TRUE;
\5a;_N[Ed KeyCount++;
vrh2}biCR break;
i3)7Qa[ }
!
GtF%V }
^rGuyW# return bAdded;
LaL{
^wP }
q4vHsy36 Cd_H<8__ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]<9o>#3 {
T:!H^ BOOL bRemoved=FALSE;
[vnxp/v/< for(int index=0;index<MAX_KEY;index++){
z)R\WFBW if(hCallWnd[index]==hWnd){
%wGQu;re if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
:#UA!|nV hCallWnd[index]=NULL;
@# .a5 HotKey[index]=0;
`:dGPBBO HotKeyMask[index]=0;
[L
bRemoved=TRUE;
{>Qs+] KeyCount--;
,0?3k break;
"ER=c3 t }
xo(>nFjo }
=7S\-{ }
5X9*K return bRemoved;
y#nyH0U }
D/z*F8'c oP:OurX8V void VerifyWindow()
uK[gI6M {
3)l<'~"z< for(int i=0;i<MAX_KEY;i++){
Q.fD3g if(hCallWnd
!=NULL){ {!pYQ|#
if(!IsWindow(hCallWnd)){ jtwe9
hCallWnd=NULL; /vqsp0e"H
HotKey=0; cdg&)
HotKeyMask=0; n,p \~Tu,
KeyCount--; %D ,(S-Uj
} iUS?xKN$~-
} Ft @ZK!'@
} '~x jaa;.
} hM8FN
:eSwXDy&
BOOL CHookApp::InitInstance() OuB[[L
{ k[1w] l8
AFX_MANAGE_STATE(AfxGetStaticModuleState()); <7j"CcJzZ
hins=AfxGetInstanceHandle(); K3`48,`?wA
InitHotkey(); bFfDaO<k
return CWinApp::InitInstance(); iv6bXV'N
} x'
3kHw
ho6,&Bp8
int CHookApp::ExitInstance() c`#4}$
{ l^v,X%{Iz
VerifyWindow(); f/i[?
gw
UnInit(); W\z<p P
return CWinApp::ExitInstance(); 2VkA!o4nP
} =fI0q7]ndz
B_0]$D0
^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7zu3o
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?M04 cvm
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^NO;A=9b[
#if _MSC_VER > 1000 dg;E,'e_
p
#pragma once {G _|gs
#endif // _MSC_VER > 1000 P1"g62R
.u;'eVH)a}
class CCaptureDlg : public CDialog 62>/0_m5
{
83:qIfF
// Construction 9`DY6qfly
public: |d_ rK2
BOOL bTray; @C5%`{\
BOOL bRegistered; 'h{DjNSM
BOOL RegisterHotkey(); )H1chNI)
UCHAR cKey; 15!b]':
UCHAR cMask; Mm#=d?YUHJ
void DeleteIcon(); i-&"1D[&
void AddIcon(); |r53>,oR<:
UINT nCount; "z|%V/2b3
void SaveBmp(); V;]U]
CCaptureDlg(CWnd* pParent = NULL); // standard constructor M,N(be-
// Dialog Data zKaEh
//{{AFX_DATA(CCaptureDlg) A>}]=Ii/
enum { IDD = IDD_CAPTURE_DIALOG }; 8j!(*'J.
CComboBox m_Key; L&~>(/*7U
BOOL m_bControl; "RsH'`
BOOL m_bAlt; Re'Ek
BOOL m_bShift; u9dL-Nr`
CString m_Path; 8\8%FSrc
CString m_Number; zy[|4Q(?
//}}AFX_DATA wGA%h.[M|
// ClassWizard generated virtual function overrides v:@ud,d<
//{{AFX_VIRTUAL(CCaptureDlg) Jf8AKj3
public: !)'|Y5 o
virtual BOOL PreTranslateMessage(MSG* pMsg); "_/5{Nc$
protected: Q$DF3[NC
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iMOf];O)
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]ch=D
//}}AFX_VIRTUAL %q,^A+=
// Implementation (ZuV5|N
protected: JZrUl^8E
HICON m_hIcon; U*em)/9
// Generated message map functions 6 0Obek`
//{{AFX_MSG(CCaptureDlg) @?"t&h
virtual BOOL OnInitDialog(); ,<?M/'4}G
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jRIm_)
afx_msg void OnPaint(); &g-uQBQI#
afx_msg HCURSOR OnQueryDragIcon(); )Z2t=&Nw
virtual void OnCancel(); Gu9x4p
afx_msg void OnAbout(); Li\BRlebR{
afx_msg void OnBrowse(); )?PRG=
afx_msg void OnChange(); oJTsrc_-
//}}AFX_MSG ~j2=hkS
DECLARE_MESSAGE_MAP() '$n#~/#}
}; *d/]-JN,K
#endif CDM==Xa*
OHha5n
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +bK.{1
#include "stdafx.h" %S<( z5
#include "Capture.h" g8_IZ(%:
#include "CaptureDlg.h" VG`A* Vj
#include <windowsx.h> <=,KP)
#pragma comment(lib,"hook.lib") 7eg//mL"6
#ifdef _DEBUG O(E-ox~q
#define new DEBUG_NEW "i_}\p.,X
#undef THIS_FILE XP-4=0 zd
static char THIS_FILE[] = __FILE__; oFRb+H(E
#endif )(pJ~"'L
#define IDM_SHELL WM_USER+1 J;wA
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {L8(5
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4n@,
p0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c!%:f^7g
class CAboutDlg : public CDialog 2v<[XNX
{ prY9SQd
public: hD/bO
CAboutDlg(); s"|N-A=cS
// Dialog Data 8Q1){M9'
//{{AFX_DATA(CAboutDlg) d0 tN73(
enum { IDD = IDD_ABOUTBOX }; '4A8\&lQO
//}}AFX_DATA m H'jr$ ?
// ClassWizard generated virtual function overrides !2N#H~{
//{{AFX_VIRTUAL(CAboutDlg) 6X:-Z3
protected: jL)aU> kN
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R@0ELxzA
//}}AFX_VIRTUAL .n`MPx'
// Implementation \?fl%r2
protected: d}',Bl+u{$
//{{AFX_MSG(CAboutDlg) b`K~l'8
//}}AFX_MSG "FaG5X(
DECLARE_MESSAGE_MAP()
)[)-.{q
}; 6#5@d^a
9bXU!l[
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nZN]Q9
{ k 9Kv
//{{AFX_DATA_INIT(CAboutDlg) 1)NX;CN
//}}AFX_DATA_INIT j&Ayk*
} |_~BV&g,N
'eqvK|Uj:
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )11/BB\v
{ yZFvpw|g
CDialog::DoDataExchange(pDX); &H5
6mL{
//{{AFX_DATA_MAP(CAboutDlg) 4[.-
a&!}
//}}AFX_DATA_MAP
VV]{R'
} QbqLj>-AJ
?-\K Vha
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &"C1XM
//{{AFX_MSG_MAP(CAboutDlg) %v~j10e
// No message handlers ~`_nw5y
//}}AFX_MSG_MAP OR"n i
END_MESSAGE_MAP() 6x/ X8zu
_W#27I
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )_2!1
: CDialog(CCaptureDlg::IDD, pParent) [TO:-8$.
{ YBS]JCO
//{{AFX_DATA_INIT(CCaptureDlg) 4
<]QMA0
m_bControl = FALSE; JBUJc
m_bAlt = FALSE; vW)GUAF[
m_bShift = FALSE; oS,<2Z
m_Path = _T("c:\\"); J;_JHlK
m_Number = _T("0 picture captured."); <U,T*Ql1x
nCount=0; |+`hSA
bRegistered=FALSE; B~PF <8h5
bTray=FALSE; "F[VqqD
//}}AFX_DATA_INIT #{
Uk4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Gh{k ~/B
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *.nqQhW
} \v-> '
zRE7 w:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z p__
{ acGmRP9g
CDialog::DoDataExchange(pDX); wH${q@z _
//{{AFX_DATA_MAP(CCaptureDlg) 06Hn:IT18
DDX_Control(pDX, IDC_KEY, m_Key); 3&?Tc|F+
DDX_Check(pDX, IDC_CONTROL, m_bControl); y:|7.f
DDX_Check(pDX, IDC_ALT, m_bAlt); Bxa],inuZ
DDX_Check(pDX, IDC_SHIFT, m_bShift); ?4lAL
DDX_Text(pDX, IDC_PATH, m_Path); nM0nQ{6
DDX_Text(pDX, IDC_NUMBER, m_Number); z~VA#8>
//}}AFX_DATA_MAP U.^)|IHW
} h;ShNU
"!Qhk3*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) H`Z4a
N
//{{AFX_MSG_MAP(CCaptureDlg) #!`zU4&2
ON_WM_SYSCOMMAND() dl":?D4H
ON_WM_PAINT() 'g=yJ
ON_WM_QUERYDRAGICON() RD_;us@&&*
ON_BN_CLICKED(ID_ABOUT, OnAbout) -dvDAs{X
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q^p@ 1I
ON_BN_CLICKED(ID_CHANGE, OnChange) +tV(8h4
//}}AFX_MSG_MAP UxS;m4
END_MESSAGE_MAP() o"]eAQ
$&e(V6A@
BOOL CCaptureDlg::OnInitDialog() xY~
DMcO?
{ BO9Z"|"
CDialog::OnInitDialog(); AV2q*
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5r+0^UAO:J
ASSERT(IDM_ABOUTBOX < 0xF000); %DV@ 2rC<
CMenu* pSysMenu = GetSystemMenu(FALSE); S|>Up%{n[
if (pSysMenu != NULL) %#]T.g
{ ?D\%ZXo
CString strAboutMenu; _$bx4a
strAboutMenu.LoadString(IDS_ABOUTBOX); Z?X$8o^Z
if (!strAboutMenu.IsEmpty()) )>Lsj1qk
{ {!/y@/NK2
pSysMenu->AppendMenu(MF_SEPARATOR); .nSupTyG
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?\O+#U%W
} 9=kTTF s
} 5~44R@`
SetIcon(m_hIcon, TRUE); // Set big icon v =?V{"wk!
SetIcon(m_hIcon, FALSE); // Set small icon FI/YJ@21
m_Key.SetCurSel(0); zhCI+u4/qz
RegisterHotkey(); )-QNWN
H
CMenu* pMenu=GetSystemMenu(FALSE); ,X$Avdc2
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); | 5L1\O8#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); KqSa"76R
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P5d@-l%}
return TRUE; // return TRUE unless you set the focus to a control :O!G{./(_
} nEp'l.T
|,7J!7T(I
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @LE?XlhD
{ pS<b|wu?f
if ((nID & 0xFFF0) == IDM_ABOUTBOX) $3[cBX.=
{ #y*=UV|h
CAboutDlg dlgAbout; K?;p:
dlgAbout.DoModal(); &=?`;K
} m+m6"yE#_
else \Zh)oUHd
{ __V]HcP;
CDialog::OnSysCommand(nID, lParam); ^2AF:(E
} D}061~zb$
} eFnsf}(Iy
n% `r
void CCaptureDlg::OnPaint() (O-)uC
{ ~c="<xBE
if (IsIconic()) z^Jl4V
{ b$
x"&&
CPaintDC dc(this); // device context for painting ~`})x(!
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X<m%EXvV
// Center icon in client rectangle 3N
bn|_`(
int cxIcon = GetSystemMetrics(SM_CXICON); 4y1>!~f
int cyIcon = GetSystemMetrics(SM_CYICON); 7>zKW?
CRect rect; ?V{k\1A
GetClientRect(&rect); Ad,r(0a LZ
int x = (rect.Width() - cxIcon + 1) / 2; qbEj\
b[
int y = (rect.Height() - cyIcon + 1) / 2; 9V66~Bf5
// Draw the icon hY1|qp
dc.DrawIcon(x, y, m_hIcon); AslH
V@K
} L@z !,r,
else a`-hLX)~Z
{ ];I| _fXo%
CDialog::OnPaint(); 1SFKP$^
} XsOOkf\_
} C^%zV>o
9_Re,h
HCURSOR CCaptureDlg::OnQueryDragIcon() "pZ3
{ {IMzR'PN
return (HCURSOR) m_hIcon; 8Wj=|Ow-q
} fMQ*2zGu95
UC1!J
=f
void CCaptureDlg::OnCancel() +r0eTP=zf
{ 4{DeF@@
if(bTray) yo*iv+l
DeleteIcon(); /,Rca1W
CDialog::OnCancel(); nFfCw%T?
} }91mQ`3
H< ;Fb;b
void CCaptureDlg::OnAbout() *!'&:
{ mU=6"A0
U
CAboutDlg dlg; Ib2 @Wi
dlg.DoModal(); KCk?)Qv
} >-w=7,?'?z
BJ9sR.yX62
void CCaptureDlg::OnBrowse() h6h1.lZ
{ A(n=kx
CString str; \ZFQ?e,d
BROWSEINFO bi; mbBRuPEa=u
char name[MAX_PATH]; pIu H*4Vz
ZeroMemory(&bi,sizeof(BROWSEINFO)); -m160k3
bi.hwndOwner=GetSafeHwnd(); B"PHJj
bi.pszDisplayName=name; -L9R&r#_e
bi.lpszTitle="Select folder"; p??/r
bi.ulFlags=BIF_RETURNONLYFSDIRS; }Hz-h4Z
LPITEMIDLIST idl=SHBrowseForFolder(&bi); _g 4/%
if(idl==NULL) `XxG"k\/S
return; O4/n!HOb
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d=Do@)
m|
str.ReleaseBuffer(); -(w~LT$ "
m_Path=str; EB>B,#
if(str.GetAt(str.GetLength()-1)!='\\') P!y`$Ky&
m_Path+="\\"; ?Y{^un
UpdateData(FALSE); ay(!H~q_U
} %kx
^/DH
#\;>8
void CCaptureDlg::SaveBmp() ^ L^F=q x
{ d>, V
CDC dc; nnE_OK!}T
dc.CreateDC("DISPLAY",NULL,NULL,NULL); mhk/>+hF
CBitmap bm; "W@XP+POAY
int Width=GetSystemMetrics(SM_CXSCREEN); 3%R{"Q"
int Height=GetSystemMetrics(SM_CYSCREEN); u:k:C
bm.CreateCompatibleBitmap(&dc,Width,Height); kwHqvO!G
CDC tdc; gKN}Of@^1
tdc.CreateCompatibleDC(&dc); h/Hl?O8[
CBitmap*pOld=tdc.SelectObject(&bm); A)zPaXZ
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *J_iXu|
tdc.SelectObject(pOld); OB6J.dF[%
BITMAP btm; [?chK^8
bm.GetBitmap(&btm); sEce{"VC
DWORD size=btm.bmWidthBytes*btm.bmHeight; /vjGjb=3U
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s=d+GMa
BITMAPINFOHEADER bih; ;1W6"3t-Y
bih.biBitCount=btm.bmBitsPixel; $Z;B QJVH
bih.biClrImportant=0; d/{Q
t
bih.biClrUsed=0; fcRj
bih.biCompression=0; p9-0?(]
bih.biHeight=btm.bmHeight; G02ox5X
bih.biPlanes=1; RF_[?O)Q
bih.biSize=sizeof(BITMAPINFOHEADER); 6&89~W{
bih.biSizeImage=size; m0A# 6=<
bih.biWidth=btm.bmWidth; 6b?`:$Cw3)
bih.biXPelsPerMeter=0; lhqQCV
bih.biYPelsPerMeter=0; {A|bBg1!
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QDS0ejhp
static int filecount=0; XHxz @_rw
CString name; 1SW4Y
name.Format("pict%04d.bmp",filecount++); #?9Q{0e
name=m_Path+name; 0
y<k][
BITMAPFILEHEADER bfh; eC ~jgB
bfh.bfReserved1=bfh.bfReserved2=0; ->\N_|_
bfh.bfType=((WORD)('M'<< 8)|'B'); ]pnYvXf>!
bfh.bfSize=54+size; 91up^
bfh.bfOffBits=54; ~r<p@k=.#0
CFile bf; <_9!
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ga-{!$b*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R2w`Y5#`
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j 1(T )T
bf.WriteHuge(lpData,size); u_.HPA
bf.Close(); P@gtdi(Q
nCount++; d$K=c1
} "u;YI=+
GlobalFreePtr(lpData); KAed!z9
if(nCount==1) Wr5 Q5s)c
m_Number.Format("%d picture captured.",nCount); (SF1y/g@=
else @`w n<%o$
m_Number.Format("%d pictures captured.",nCount); S[mM4et|
UpdateData(FALSE); q#NR32byF
} t?{B_Bf
!\;:36B#6
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e .l!3xY2'
{ _A 2Lv]vfV
if(pMsg -> message == WM_KEYDOWN) QR"bYQ
{ Nb;H`<JP
if(pMsg -> wParam == VK_ESCAPE) n 'K6vW3
return TRUE; DyfsTx
if(pMsg -> wParam == VK_RETURN)
6Y1J2n"
return TRUE; vXdZmYrC
} \9)#l#m
return CDialog::PreTranslateMessage(pMsg); / p)F>WR
} )KY:m |Z
8o|P&q(v*
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C>X|VP|C
{ .!RavEg+
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ J8<J8x4
SaveBmp(); 7,'kpyCj
return FALSE; >A}0Ho
} 5HKW"=5Cf
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oNM?y:O
CMenu pop; XE rUS80
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); V8PLFt;
CMenu*pMenu=pop.GetSubMenu(0); #@qN8J}R
pMenu->SetDefaultItem(ID_EXITICON); ?6P.b6m}0
CPoint pt; zO~9zlik
GetCursorPos(&pt); 8TWTbQ
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); cozXb$bBY
if(id==ID_EXITICON) 5`-UMz<]
DeleteIcon(); #0"~G][#
else if(id==ID_EXIT) N|:'XwL
OnCancel(); L}%dCe
return FALSE; u[oUCTY
} %Mn.e a
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6bO~/mpWT~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 60}! LmL
AddIcon(); 2/7_;_#vJ%
return res; E167=BD9<
} A??@AP[7M
9YN?
void CCaptureDlg::AddIcon() m:+8J,jW
{ pz|'l:v^
NOTIFYICONDATA data; p9qKLJ*.C
data.cbSize=sizeof(NOTIFYICONDATA); V416g |lBO
CString tip; y$W|~ H
tip.LoadString(IDS_ICONTIP); J
CGC
data.hIcon=GetIcon(0); Pm{*.AW1
data.hWnd=GetSafeHwnd(); LnsD
strcpy(data.szTip,tip); ,h]o>
data.uCallbackMessage=IDM_SHELL; n,'OiVl[
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l$xxrb9P!
data.uID=98; '0RwO[A#1
Shell_NotifyIcon(NIM_ADD,&data); u1^wDc*xg
ShowWindow(SW_HIDE); ,&^3Z
bTray=TRUE; +A8j@d#:
} s5&@Cxzl
G$M9=@Ug
void CCaptureDlg::DeleteIcon() pB:$lS
{ OO) ~HV4\
NOTIFYICONDATA data; f9u^ R=Ff[
data.cbSize=sizeof(NOTIFYICONDATA); BU Z
_)
data.hWnd=GetSafeHwnd(); 0&+k.Vg
data.uID=98; z+{,WHjo
Shell_NotifyIcon(NIM_DELETE,&data); NAC_pM&B
ShowWindow(SW_SHOW); O[^%{'
SetForegroundWindow(); OhZgcUqQ8
ShowWindow(SW_SHOWNORMAL); 4u;9J*r4
bTray=FALSE; Jju#iwb
} ~&dyRtW4
}yn0IWVa
void CCaptureDlg::OnChange() bm~W
EX
{ eV^d6T$
RegisterHotkey(); -Apc$0ZsN
} rqPo)AL
VosZJv=
BOOL CCaptureDlg::RegisterHotkey() Ws U)Y&
{ B!]2Se2G
UpdateData(); {$D,?V@%_
UCHAR mask=0; uA tV".
UCHAR key=0; 6RO(]5wX
if(m_bControl) t_z>Cl^u
mask|=4; ?t&kb7
if(m_bAlt) r|Z3$J{^"
mask|=2; S^@S%Eg
if(m_bShift) Dr&('RZ4
mask|=1; 1@48BN8cm'
key=Key_Table[m_Key.GetCurSel()]; \*hrW(
if(bRegistered){ ^|~mlY@w
DeleteHotkey(GetSafeHwnd(),cKey,cMask); H<hVTc{K
bRegistered=FALSE; tsOrt3
} MB^~%uZ2K
cMask=mask; C&LBr|
cKey=key; +Mewo
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P9Yy9_a|x
return bRegistered; 8
;d$54
b
} {'sY|lou
N[]Hc
四、小结 >2$5eI
/n~\\9#3
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。