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:
UF37|+"E
u~b;m
一、实现方法
oA/[>\y LFvO[& 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
v'3.`aZ! EHI%QT #pragma data_seg("shareddata")
][vm4UY HHOOK hHook =NULL; //钩子句柄
2kukQj(n UINT nHookCount =0; //挂接的程序数目
) 0NKL:u static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
C7PVJnY0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
-_@zyF<G static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
iM
\3~3' static int KeyCount =0;
3XykIj1 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
h&5bMW #pragma data_seg()
fv@mA -- S +wy^x@@ 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。
YkWv*l arVu`pD*n 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:
ki|KtKAu_9 LAs#g||M BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
@6["A'h cKey,UCHAR cMask)
4)Jtc2z7Z\ {
Uk1|y\ BOOL bAdded=FALSE;
v@,n]" for(int index=0;index<MAX_KEY;index++){
H){}28dX if(hCallWnd[index]==0){
<O<Kf:i&c1 hCallWnd[index]=hWnd;
|h^[/ HotKey[index]=cKey;
6ijL+5 HotKeyMask[index]=cMask;
1`6kc9f. bAdded=TRUE;
@FNaCmBX KeyCount++;
stxei
6 break;
6chcpP0 }
h2S!< }
TA4>12C6 return bAdded;
Y5mQY5u| }
jpwR\"UJ //删除热键
;*{"|l qe BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
qb$&BZj]| {
T'^ Do/ BOOL bRemoved=FALSE;
1s-dqHz"s for(int index=0;index<MAX_KEY;index++){
;-0
d 2Z if(hCallWnd[index]==hWnd){
7C;oMh5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@ra^0 hCallWnd[index]=NULL;
1>yh`Bp\= HotKey[index]=0;
zG\& ZU HotKeyMask[index]=0;
bwR$910b bRemoved=TRUE;
7];AB;0" KeyCount--;
8n&Gn%DvX break;
!l6Ez_' }
W(4Mvd }
y
-6{>P/ }
k2 _i;v return bRemoved;
cePe0\\ }
6
4,('+ oMNt676 !k3 eUBF DLL中的钩子函数如下:
cy-o@U"s8 UWXl
c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
02$d {
q"@>rU4 BOOL bProcessed=FALSE;
ayGcc` if(HC_ACTION==nCode)
XJZ\ss {
?td`*n~, if((lParam&0xc0000000)==0xc0000000){// 有键松开
Vb @lK~ switch(wParam)
G-6k[-@-v {
1G'D' case VK_MENU:
IgIM8"N MaskBits&=~ALTBIT;
.IU\wN break;
PtTL
tiE~ case VK_CONTROL:
}/bxe0px MaskBits&=~CTRLBIT;
1agNwFd~ break;
m{gw:69h case VK_SHIFT:
:{LNr!I?I MaskBits&=~SHIFTBIT;
<da-iY\5 break;
|LLDaA-=0 default: //judge the key and send message
A+=K<e break;
@fQvAok }
5r1u_8)' for(int index=0;index<MAX_KEY;index++){
|NdWx1 if(hCallWnd[index]==NULL)
Q]{ `m continue;
i7XM7+} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gbrn'NT {
BHu%x|d SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]?7q%7-e.a bProcessed=TRUE;
h/oC9?v }
rD;R9b"J }
n\i~H }
pi|=3W else if((lParam&0xc000ffff)==1){ //有键按下
^`S.Mw. switch(wParam)
f6,?Yex8B {
29HyeLB@ case VK_MENU:
oh0*b h MaskBits|=ALTBIT;
-Hh.8(!XoO break;
gy`WBg(7x case VK_CONTROL:
|yinV fZ0C MaskBits|=CTRLBIT;
)61X,z break;
/ q| o case VK_SHIFT:
*B)J(^M!q MaskBits|=SHIFTBIT;
$'x#rW>v break;
Fhrj$ default: //judge the key and send message
&J\<"3 break;
FeT|
Fh:L }
i+Lqj for(int index=0;index<MAX_KEY;index++){
`m`Y3I if(hCallWnd[index]==NULL)
%M*2 j%6 continue;
RsW4 '5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vlq L {
9i46u20 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Z8ds`KZM bProcessed=TRUE;
x~JOg57up }
~f:"Q(f+ }
+>ld }
{%oxzdPc if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
BR-4L2[ for(int index=0;index<MAX_KEY;index++){
udOdXz6K? if(hCallWnd[index]==NULL)
- i#Kpf continue;
ny"z<N&}/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
a$5P\_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
x#XxD<y //lParam的意义可看MSDN中WM_KEYDOWN部分
G ?Hx"3:? }
5uX-onP\[ }
+O)Y7k{?C5 }
?="?)t[ return CallNextHookEx( hHook, nCode, wParam, lParam );
ZY|$[>X! }
4(dgunP mpNS}n6 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
? _7iL? &;naaV_2T BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
7Bym? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1+#E|YWJ N;v]ypak 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
9>@Vk
vpY f28bBuv1? LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
f~R+Q/Gtz` {
w! PguP if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
>QdT7gB {
!;U oZ~ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
nT%ko7~- SaveBmp();
q?qH7={,eu return FALSE;
Qb5@e#
}
"vX\Q rL …… //其它处理及默认处理
^ X-6j[". }
P Ij ?vfZ>7Q Am|)\/K+Z 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
_3IRj=Cs w6h*dh$w 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。
IgN^~ag` 3RF`F
i 二、编程步骤
V KxuK0{ )nGH$Mu 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";
k;Fxr% *L~?.9R 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
V`8\)FFG c#f@v45 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;
x!6<7s I+,CiJ|4 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;
c^<~Y$i ]_j={0% 5、 添加代码,编译运行程序。
p=m:^9/ P;eXUF+jn 三、程序代码
~9PZ/(
' 1ASoH,D/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
eM@xs<BR #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
91-[[< #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
tAPf#7{|
#if _MSC_VER > 1000
!;4Hh)2 #pragma once
v o4U% #endif // _MSC_VER > 1000
mL-6+pJ@ #ifndef __AFXWIN_H__
oQA,57B #error include 'stdafx.h' before including this file for PCH
Q/q>mN"#1 #endif
ExM VGe #include "resource.h" // main symbols
.K]Uk/W class CHookApp : public CWinApp
>?#zPweA {
l&*=
.Zc7! public:
Dr76+9'i CHookApp();
JLt%G^W> // Overrides
^X?uAX-RP| // ClassWizard generated virtual function overrides
:5F(,Z_ //{{AFX_VIRTUAL(CHookApp)
l"7#(a public:
U~d%5?q virtual BOOL InitInstance();
!zsrORF{ virtual int ExitInstance();
{
'402 //}}AFX_VIRTUAL
@j"6f|d //{{AFX_MSG(CHookApp)
%@:6& // NOTE - the ClassWizard will add and remove member functions here.
=\k:] // DO NOT EDIT what you see in these blocks of generated code !
[$F*R@,& //}}AFX_MSG
w IP4Z^ DECLARE_MESSAGE_MAP()
t
.}];IJP };
~ToU._ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
do*aE BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
<k0/O BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
p I~;3T:! BOOL InitHotkey();
G8 q<) BOOL UnInit();
Uu52uR #endif
Y;'SD{On 4*D"*kR; //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^KnK
\ #include "stdafx.h"
BOh^oQh #include "hook.h"
EqGpo_ #include <windowsx.h>
Sfa=AV7K #ifdef _DEBUG
gX7R-&[UD #define new DEBUG_NEW
)Ay 90Wt #undef THIS_FILE
.lq83;
k static char THIS_FILE[] = __FILE__;
>q0%yh- #endif
IA{W-RRb #define MAX_KEY 100
6B*#D.fd* #define CTRLBIT 0x04
|fIyq}{7 #define ALTBIT 0x02
f$ tm<:)Y #define SHIFTBIT 0x01
T:Ovh.$ #pragma data_seg("shareddata")
mYj)![ HHOOK hHook =NULL;
A2;6Vz=z UINT nHookCount =0;
Y%?*Lj| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
bdY:-8!3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
3m9b static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
(,tu7u{ static int KeyCount =0;
[[w | static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
nM Z)x- #pragma data_seg()
qGX#(,E9; HINSTANCE hins;
5KDCmw void VerifyWindow();
oH!O{pQK} BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
,QpFVlPU //{{AFX_MSG_MAP(CHookApp)
|2%|= // NOTE - the ClassWizard will add and remove mapping macros here.
<5,|h3]-# // DO NOT EDIT what you see in these blocks of generated code!
]31=8+D //}}AFX_MSG_MAP
Y9>92#aME END_MESSAGE_MAP()
!%D';wQ,/ ! nvg:$.& CHookApp::CHookApp()
e(xuy'4r {
3kk^hvB+f // TODO: add construction code here,
15q^&l[Q // Place all significant initialization in InitInstance
Ibu9AwPm }
{~uTi>U D,R',(3 CHookApp theApp;
kY!zBk LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qv}ECQ {
&oq0XV.M^ BOOL bProcessed=FALSE;
N_S~&(I| if(HC_ACTION==nCode)
RGs7Hc {
? dHl' if((lParam&0xc0000000)==0xc0000000){// Key up
D/~1?p switch(wParam)
vy 7/ {
P tLWFO case VK_MENU:
EFljUT?& MaskBits&=~ALTBIT;
K5|~iW' break;
gua7<z6=eh case VK_CONTROL:
(ie%zrhS MaskBits&=~CTRLBIT;
-*MY7t3 break;
=*jFaj case VK_SHIFT:
)dqNN tS MaskBits&=~SHIFTBIT;
lux
g1> break;
@fJsRWvGq default: //judge the key and send message
KYtCN+vsG break;
-4sKB>b }
ux)*B}/xh for(int index=0;index<MAX_KEY;index++){
_^NaP if(hCallWnd[index]==NULL)
6%ofS8[ continue;
$Seh4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@+H0D" {
|bnYHP$! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
T'vI@i9 bProcessed=TRUE;
}8#Ed;%K }
,LN^Zx* }
R:YVmqd }
%),u0:go else if((lParam&0xc000ffff)==1){ //Key down
!C05;x8{ switch(wParam)
5cinI^x)f {
MTZCI} case VK_MENU:
Z#-N$%^F MaskBits|=ALTBIT;
`G/g/>y break;
[M,4qe8,} case VK_CONTROL:
rU&Y/ MaskBits|=CTRLBIT;
=CRptk6tS break;
b<~-s sL7a case VK_SHIFT:
Ao$k[#px MaskBits|=SHIFTBIT;
8K?}!$fz break;
ThgJ
' default: //judge the key and send message
g:a[N%[C break;
W
h 9L!5 }
$b1>,d'oz for(int index=0;index<MAX_KEY;index++)
S-88m/"]s {
qbfX(`nS if(hCallWnd[index]==NULL)
#jrlNg4( continue;
(C#0
ML if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>MN"87U6 {
;Vat\,45pg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
JJ
?'<)EF bProcessed=TRUE;
e4SS'0| }
7=^}{ }
k[ z yR }
un_NBv} if(!bProcessed){
]!"w?-h Si for(int index=0;index<MAX_KEY;index++){
rFpYlMct if(hCallWnd[index]==NULL)
su%-b\8K continue;
GI/NouaNfm if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[)s4:V SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~Yi4?B< }
g^(gT }
6h)_{|
L ) }
#jg-q|nd return CallNextHookEx( hHook, nCode, wParam, lParam );
bUm%#a }
jaodcT0 _Ffg"xoC BOOL InitHotkey()
"WQ6[;&V {
[B;okW if(hHook!=NULL){
t-KicLr nHookCount++;
_$c o Y return TRUE;
.,xyE--;d }
3kC|y[.& else
x4c|/}\)*
hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
aYT!xdCI if(hHook!=NULL)
YR-G:-(#b nHookCount++;
g:)iEw>a return (hHook!=NULL);
lWj*tnnn[ }
vLHn4>J,R BOOL UnInit()
uK$ Xqo%L {
tm.60udbo if(nHookCount>1){
{{Ox%Zm nHookCount--;
mu{C>w_Rz return TRUE;
k+-?b(z)$ }
{c9 fv H BOOL unhooked = UnhookWindowsHookEx(hHook);
#J&3Zds if(unhooked==TRUE){
5tpC$4m nHookCount=0;
AZc=Bbh hHook=NULL;
By8SRWs }
EA>.SSs! return unhooked;
#0b:5.vy }
X/2GTU7? 8Lx/ZGy BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(FApkvy {
B._YT BOOL bAdded=FALSE;
r/'!#7dLG- for(int index=0;index<MAX_KEY;index++){
|{kbc0* if(hCallWnd[index]==0){
~k"b"+2 hCallWnd[index]=hWnd;
ial{A6X HotKey[index]=cKey;
g{6jN HotKeyMask[index]=cMask;
FqA4 OU bAdded=TRUE;
%AA&n*m KeyCount++;
]b%U9hmL^f break;
ZN$%\,< }
er7(Wph }
; >H1A return bAdded;
CYy=f- }
-_t4A * I*.nwV< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
02t({>` {
4;Ucas6 BOOL bRemoved=FALSE;
E|c(#P{ for(int index=0;index<MAX_KEY;index++){
1k4\zVgi if(hCallWnd[index]==hWnd){
%_5#2a if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
E7iAN\vo hCallWnd[index]=NULL;
3W[?D8yi) HotKey[index]=0;
D
tZ?sG HotKeyMask[index]=0;
?s$d("~ bRemoved=TRUE;
GxD`M2 KeyCount--;
__9FQ{Ra break;
7>gjq'0
}
mW'3yM }
6H'A]0 }
r+C4<-dT return bRemoved;
i8e*9;4@ }
T{Xd > P1rjF:x[* void VerifyWindow()
Pz0MafF|T {
2kVZlt'y for(int i=0;i<MAX_KEY;i++){
8b'@_s!_ if(hCallWnd
!=NULL){ Vq]ixag2^
if(!IsWindow(hCallWnd)){ i;9X_?QF
hCallWnd=NULL; 2_HIn
HotKey=0; xA7~"q&u
HotKeyMask=0; )1#/@cU
KeyCount--; Xrb7.Y0d
} ?{"r(
} VBi gUK4
} K9Mz4K_
} 2YZ>nqy
|D-[M_T5
BOOL CHookApp::InitInstance() hJ`Gu7
{ q-;Y }q
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]m1p<*0I$
hins=AfxGetInstanceHandle(); 1!.-/
InitHotkey(); Pp!4Ak4TT9
return CWinApp::InitInstance(); ZtO$kK%q;
} 8k-]u3
I?PqWG!O
int CHookApp::ExitInstance() q}L`8(a
{ e,}h^^"
VerifyWindow(); `OMX 9i
UnInit(); b;jdk w|
return CWinApp::ExitInstance(); $k0(iFzR1
} H;\C7w|
TSewq4`K
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file a-|pSe*rx
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u@e.5_:S)
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vwu/33
#if _MSC_VER > 1000 2
G_KTYJ
#pragma once V:y6NfL7i'
#endif // _MSC_VER > 1000 J$yq#LBbR@
Hh;lT
class CCaptureDlg : public CDialog _-({MX[3k<
{ B;N<{Gb
// Construction 3ArHaAv{y
public: ].xSX0YQ%
BOOL bTray; !0?o3,of-
BOOL bRegistered;
BM?!?
BOOL RegisterHotkey(); N\__a~'0p
UCHAR cKey; EP@u4F
UCHAR cMask; ![K\)7 iKo
void DeleteIcon(); JS ^Cc
void AddIcon(); n-8/CBEH(
UINT nCount; %z@ Z^Jv
void SaveBmp(); b3-j2`#
CCaptureDlg(CWnd* pParent = NULL); // standard constructor w~v6=^
// Dialog Data nu+K
N,3R"
//{{AFX_DATA(CCaptureDlg) n',X,P0
enum { IDD = IDD_CAPTURE_DIALOG }; !1I# L!9
CComboBox m_Key; af |mk@
BOOL m_bControl; 6k;5T
BOOL m_bAlt; 6vbKKn`ST
BOOL m_bShift; 1ygEyC[1
CString m_Path; G(wK(P0j
CString m_Number; X<8|uP4
//}}AFX_DATA I ==)a6^
// ClassWizard generated virtual function overrides 'qT;Eht5
//{{AFX_VIRTUAL(CCaptureDlg) +Xw%X3o)
public: dQ{qA(m
virtual BOOL PreTranslateMessage(MSG* pMsg); >&;J/ME
protected: ]'Eg2(wy
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zGU MH7 M
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !Q|a R
//}}AFX_VIRTUAL PI%l
// Implementation 9k71h`5
protected: `{{6vb^g
HICON m_hIcon; .q
MxShUU
// Generated message map functions kl:/PM^
//{{AFX_MSG(CCaptureDlg) Ywhhs
}f
virtual BOOL OnInitDialog(); qX\85dPn@}
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VC/n}7p
afx_msg void OnPaint(); *Lrrl
afx_msg HCURSOR OnQueryDragIcon(); 4dFr~ {
virtual void OnCancel(); {2:baoG-
afx_msg void OnAbout(); ?aTH<
afx_msg void OnBrowse(); nD/B:0'
afx_msg void OnChange(); 5PeYQ-B|
//}}AFX_MSG TM6wjHFm
DECLARE_MESSAGE_MAP() 3_
J'+
}; +I5\`By=
#endif X8Z) W?vu
]'xci"qV`
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gBV4IQ
#include "stdafx.h" GEy7Vb)
#include "Capture.h" 5fk
A?Ecqq
#include "CaptureDlg.h" 3HtM<su*h
#include <windowsx.h> M**Sus87Q
#pragma comment(lib,"hook.lib") gD)M7`4
#ifdef _DEBUG s3A(`heoq
#define new DEBUG_NEW 9U<WR*H
#undef THIS_FILE S>x@9$( ym
static char THIS_FILE[] = __FILE__; Ag0w8F
#endif V z
#define IDM_SHELL WM_USER+1 Qc*p+N+$
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !b!An; ',
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BTr
oe=R
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; bTeuOpp
class CAboutDlg : public CDialog I(VqtC:K.
{ KB~[nZs7
public:
'v Vt^h2
CAboutDlg(); p9i7<X2&
// Dialog Data m_Hg!Lg
//{{AFX_DATA(CAboutDlg) ^jL)<y4`
enum { IDD = IDD_ABOUTBOX }; ASi2;Q_{_
//}}AFX_DATA I52nQCXi
// ClassWizard generated virtual function overrides 0);5cbV7i
//{{AFX_VIRTUAL(CAboutDlg) -<x%
protected: o0No"8DnjH
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l,Q`;v5|
//}}AFX_VIRTUAL 31^/9lb
// Implementation 90+Vw`Gz=
protected: /'{vDxZf R
//{{AFX_MSG(CAboutDlg) YkF LNCg4}
//}}AFX_MSG >)Qq^?U
DECLARE_MESSAGE_MAP() 66>X$nx(z
}; Nt\07*`qCr
-]KgLgJ
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m$[:J
{ ?3DFm
//{{AFX_DATA_INIT(CAboutDlg) 5u9 lKno
//}}AFX_DATA_INIT c(Y~5A{TXO
} *j83E[(]
:1f,%Z$,q
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4IZAJqw(*
{ _s#J\!F
CDialog::DoDataExchange(pDX); ]v:,<=S
//{{AFX_DATA_MAP(CAboutDlg) A
,0}bFK
//}}AFX_DATA_MAP Hvz;[!
} %fld<O
_gK}Gi?|
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )M7yj O!
//{{AFX_MSG_MAP(CAboutDlg) ]+ub
R;
// No message handlers 1^NC=IS9z
//}}AFX_MSG_MAP 6%t6u3
END_MESSAGE_MAP() g,YF$:e
BPW.&2?<
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V+sZ;$
: CDialog(CCaptureDlg::IDD, pParent) nO6UlY
{ 2va[= >_
//{{AFX_DATA_INIT(CCaptureDlg) p?Ux1S
m_bControl = FALSE; ]{i0?c
m_bAlt = FALSE; =zAFsRoD_B
m_bShift = FALSE; ?8grK
m_Path = _T("c:\\"); :twp95{R1
m_Number = _T("0 picture captured."); ^0_ >
nCount=0; p\~ a=
bRegistered=FALSE; )ty>{t
bTray=FALSE; h{HpI
0q4
//}}AFX_DATA_INIT k:/Z6TLk3
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^`xS|Sq1D
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]D@aMC$#
} '$yy
r4FSQ$[9w
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) FDiDHOR
{ ]c_lNHssmq
CDialog::DoDataExchange(pDX); ~,F]~|U7l
//{{AFX_DATA_MAP(CCaptureDlg) #bGYHN
DDX_Control(pDX, IDC_KEY, m_Key); #r>)A
DDX_Check(pDX, IDC_CONTROL, m_bControl); yAGQD[ih
DDX_Check(pDX, IDC_ALT, m_bAlt); =?Co<972Z
DDX_Check(pDX, IDC_SHIFT, m_bShift); Q!-"5PX
DDX_Text(pDX, IDC_PATH, m_Path); yWc%z6dXC
DDX_Text(pDX, IDC_NUMBER, m_Number); -2laM9Ed
//}}AFX_DATA_MAP ffB<qf)?G
} oVUsI,8
Z 5 .cfI[
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)
nmL|v
//{{AFX_MSG_MAP(CCaptureDlg) -*&aE~Cs
ON_WM_SYSCOMMAND() M4?>x[Pw
ON_WM_PAINT() nRq[il0 `i
ON_WM_QUERYDRAGICON() Xq"9TYf$
ON_BN_CLICKED(ID_ABOUT, OnAbout) V=1yg24B<
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) H,;ZFg /v8
ON_BN_CLICKED(ID_CHANGE, OnChange) n~>b}DY
//}}AFX_MSG_MAP -H\j-k
END_MESSAGE_MAP() 9nO&d(r g
^|U5@u_
BOOL CCaptureDlg::OnInitDialog() c-7Zk!LfD
{ nF3Sfw,
CDialog::OnInitDialog(); hn6'$P
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~tNk\Kkv
ASSERT(IDM_ABOUTBOX < 0xF000); ~P!=fU)
CMenu* pSysMenu = GetSystemMenu(FALSE); 9-A@2&J1
if (pSysMenu != NULL) b<r*EY
{ A&KY7[<AC{
CString strAboutMenu; kotKKs
strAboutMenu.LoadString(IDS_ABOUTBOX); <#Fex'4
if (!strAboutMenu.IsEmpty()) jtpk5 fJB
{ ]t17= Lr?
pSysMenu->AppendMenu(MF_SEPARATOR); uRuu!{$
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]=|iO~WN
} "AWk
jdj
} K;`*n7=IA
SetIcon(m_hIcon, TRUE); // Set big icon 1-4[w
*u>
SetIcon(m_hIcon, FALSE); // Set small icon _{B2z[G}
m_Key.SetCurSel(0); v+C D{Tc
RegisterHotkey(); ~d3BVKP5
CMenu* pMenu=GetSystemMenu(FALSE); #N=_-
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2gvS`+<TP
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); guy!/zQ>A
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @[/!e`]+
return TRUE; // return TRUE unless you set the focus to a control %<q"&]e,
} )5<dmK@
Vz5<Gr
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ex}TDmTu
{ H0Sm4
if ((nID & 0xFFF0) == IDM_ABOUTBOX) b?9'-hK<
{ (d
<pxx
CAboutDlg dlgAbout; Frhm4H%,_R
dlgAbout.DoModal(); bx" .<q (
} hg+;!|ha
else FFN.9[Ly
{ A}"uEk(R
CDialog::OnSysCommand(nID, lParam); HqOnZ>D
} M
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} kl&_O8E+K
d7kv
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void CCaptureDlg::OnPaint() h*
/
{ wz:w6q
if (IsIconic()) }u5J<*:bZ
{ 7w0=i Z>K
CPaintDC dc(this); // device context for painting .=
8Es#
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !\&4,l(
// Center icon in client rectangle H/G;hk
int cxIcon = GetSystemMetrics(SM_CXICON); 3bugVJ93
int cyIcon = GetSystemMetrics(SM_CYICON); )4+uM'2%
CRect rect; ."q8 YaW
GetClientRect(&rect); @6b;sv1W
int x = (rect.Width() - cxIcon + 1) / 2; SYOU&*
int y = (rect.Height() - cyIcon + 1) / 2; 8wS9%+
// Draw the icon mvtuV`
dc.DrawIcon(x, y, m_hIcon); }4>#s$.2
}
Z\$!:
else 4T<dI6I0
{ |@ZyD$?
CDialog::OnPaint(); jm|zn
} Rn whkb&&
} y+VRD
k#@)gL
HCURSOR CCaptureDlg::OnQueryDragIcon() %bnjK#o"Q
{ C2%Yr y
return (HCURSOR) m_hIcon; JAL"On#c#0
} Ly/5" &HD
eR8>5:V_
void CCaptureDlg::OnCancel() K*MI8')
{ z<<aT
if(bTray) fli7Ow?M~
DeleteIcon(); lzZ=!dG
CDialog::OnCancel(); 5g4c1K
} jmnrpXaAx
jRdW=/q+(
void CCaptureDlg::OnAbout() N<lf,zGw
{ "\1V^2kMr
CAboutDlg dlg; D_cd
l^
dlg.DoModal(); OoAZ t
} gkv,Om
e}"k8 ./
void CCaptureDlg::OnBrowse() jM(!!AjpC
{ inx0W3d"T
CString str; ~_SVQ7P
BROWSEINFO bi; 4b$m\hoN
char name[MAX_PATH]; M$LzV}k
ZeroMemory(&bi,sizeof(BROWSEINFO)); ~leLQsZ
bi.hwndOwner=GetSafeHwnd(); ]GHx<5Q:\
bi.pszDisplayName=name; i0&]Ig|;
bi.lpszTitle="Select folder"; [6Nzz]yy
bi.ulFlags=BIF_RETURNONLYFSDIRS; 3nkO+qQ
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'P)[=+O?t
if(idl==NULL) CQ%yki
return; >qIZ
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KTu&R6|
str.ReleaseBuffer(); P~*v}A
m_Path=str; <Xj
,>2m;
if(str.GetAt(str.GetLength()-1)!='\\') Aq P\g k
m_Path+="\\"; l_*:StyR+
UpdateData(FALSE); X`n*M]
} g.O? 1bebe
v&ZI<Xt+
void CCaptureDlg::SaveBmp() 9!6yo
{ @sb00ad2q
CDC dc; p/uOCQ|1l
dc.CreateDC("DISPLAY",NULL,NULL,NULL); QWxl$%`89<
CBitmap bm; kPZ1OSX
int Width=GetSystemMetrics(SM_CXSCREEN); !' @
int Height=GetSystemMetrics(SM_CYSCREEN); ,k3aeM~`%w
bm.CreateCompatibleBitmap(&dc,Width,Height); CU(W0D
CDC tdc; s((_^yf
tdc.CreateCompatibleDC(&dc); ?GGh )";y
CBitmap*pOld=tdc.SelectObject(&bm); nnO@$T
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g|l|)T.s
tdc.SelectObject(pOld); +^.Q%b0Xx
BITMAP btm; /T2f~1R
bm.GetBitmap(&btm); x?Oc<CQ-2
DWORD size=btm.bmWidthBytes*btm.bmHeight; (G6N@>V(`
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); TMQu'<?V
BITMAPINFOHEADER bih; O/R>&8R$
bih.biBitCount=btm.bmBitsPixel; y0XI?Wr
bih.biClrImportant=0; } "ts
bih.biClrUsed=0; $JXQn
bih.biCompression=0; mJ5LRpXN
bih.biHeight=btm.bmHeight; 0<S(zva7([
bih.biPlanes=1; 4.mbW
bih.biSize=sizeof(BITMAPINFOHEADER); V_7xXuM/
bih.biSizeImage=size; x5Ee'G(
bih.biWidth=btm.bmWidth; T)B1V,2j=
bih.biXPelsPerMeter=0; 8M'6Kcr
bih.biYPelsPerMeter=0; { e%
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); l+V5dZ8W
static int filecount=0; eDSBs3k7H
CString name; Jid :$T>
name.Format("pict%04d.bmp",filecount++); 5{|\h}
name=m_Path+name; $pGk%8l%
BITMAPFILEHEADER bfh; wen6"
bfh.bfReserved1=bfh.bfReserved2=0; }t #Hq
bfh.bfType=((WORD)('M'<< 8)|'B'); .el_pg
bfh.bfSize=54+size; H{T)?J~
bfh.bfOffBits=54; dfq5P!'
CFile bf; YR`Mi.,Sfm
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \
o&i63u
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1P\_3.V{
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pf`li]j'V
bf.WriteHuge(lpData,size); 2={ g'k(
bf.Close(); d|sI>6jD
nCount++; fJC,ubP[5
} 3,B[%!3d
GlobalFreePtr(lpData); I1H:h
if(nCount==1) <cz~q=%v2&
m_Number.Format("%d picture captured.",nCount); ",rA
else u$[T8UqF
m_Number.Format("%d pictures captured.",nCount); ~1h-LbFI2
UpdateData(FALSE); =kLg)a |
} SwuadN
;"nEEe]?
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) HnqZ7%jeN
{ /(nA)V( :
if(pMsg -> message == WM_KEYDOWN) U\~[
{ OkO"t
if(pMsg -> wParam == VK_ESCAPE) fwQ%mU+
return TRUE; )V}u1C-N
if(pMsg -> wParam == VK_RETURN) #UJ@P Dwil
return TRUE; Ve8`5
} ,O(XNA(C
return CDialog::PreTranslateMessage(pMsg); U%45qCU
} 8`qw1dF
%GS)9{T&
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UrxgKTry
{ %/MK$
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wL 5).`oq
SaveBmp(); s}9aZ
return FALSE; Aq|LeH
} <STjB,_s
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ CsR~qQ
5
CMenu pop; uYMW5k_,>
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oci-[CI,
CMenu*pMenu=pop.GetSubMenu(0); 9HEc=,D|
pMenu->SetDefaultItem(ID_EXITICON); 95wV+ q*
CPoint pt; %r!
GetCursorPos(&pt); T+4Musu{V
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j`'=K_+nU
if(id==ID_EXITICON) W3 8=fyD
DeleteIcon(); l>&)_:\
else if(id==ID_EXIT) a4: PufS
OnCancel(); *G~c6BZ
return FALSE; d*>M<6b-
} z4J-qK~2
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y9)l,@D
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qw5M\
AddIcon(); C.(ZXU7
return res; ` ?6m0|\@
} L6A6|+H%E
sq)Nn&5A
void CCaptureDlg::AddIcon() sX_ ^H%fd
{ !P92e1
NOTIFYICONDATA data; sfrh+o57
data.cbSize=sizeof(NOTIFYICONDATA); 6y5arP*6e
CString tip; {2:H`|x
tip.LoadString(IDS_ICONTIP); %r!#
data.hIcon=GetIcon(0); H[Pb Wy:
data.hWnd=GetSafeHwnd(); puqH%m+u
strcpy(data.szTip,tip); kb7\qH!n
data.uCallbackMessage=IDM_SHELL; KuI>:i;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yMSRUQ
x
data.uID=98; dF.T6b
Shell_NotifyIcon(NIM_ADD,&data); eNNgxQw>m
ShowWindow(SW_HIDE); 0`ib_&yI
bTray=TRUE; X}usyO'pW
} 7_Q86o
uN\9cQ
void CCaptureDlg::DeleteIcon() $0W0+A$
{ ;Ok11wOw
NOTIFYICONDATA data; ?<LG(WY
data.cbSize=sizeof(NOTIFYICONDATA); n'h
)(^
data.hWnd=GetSafeHwnd(); w\2[dd
data.uID=98; |XH3$;=*h
Shell_NotifyIcon(NIM_DELETE,&data); ;5% &q6&a
ShowWindow(SW_SHOW); UZAWh R
SetForegroundWindow(); Dk"M8_-_
ShowWindow(SW_SHOWNORMAL); 1[Mr2 @
bTray=FALSE; s{:
Mu~v
} g*tLqV
mmKrmM*1
void CCaptureDlg::OnChange() I]
"$h]T
{ RY~)MS _C
RegisterHotkey(); B6pz1P?e}
} Sl_zO?/PF
B]qh22Yib
BOOL CCaptureDlg::RegisterHotkey() mpF_+Mn
{ *nC,=2
UpdateData(); h?1pGz)[C
UCHAR mask=0; lb6s3b
UCHAR key=0; oF6MV&q/
if(m_bControl) <|`@K|N
mask|=4; \rN_CBM
if(m_bAlt) !KlSw,&=.6
mask|=2; JZnWzqFw
if(m_bShift) 0Its;|
mask|=1; +8Px` v1L
key=Key_Table[m_Key.GetCurSel()]; q7PRJX
if(bRegistered){ Z{CL!
DeleteHotkey(GetSafeHwnd(),cKey,cMask); & T|-K\*
bRegistered=FALSE; zg
j35
} z$V8<&q
cMask=mask; O``MUb b
cKey=key; =!c+|X`
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }n7e_qy4
return bRegistered; i|O7nB@
} <&Uk!1Jd
GJuD
:
四、小结 [uY2 Nh
7 r<>^j'
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。