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:
rC^WPW
yPb" V 一、实现方法
z7fp#>uw *Q
"wwpl? 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:
i9,geQ7d +~ P2C6@G #pragma data_seg("shareddata")
'-Vt|O_Q HHOOK hHook =NULL; //钩子句柄
k_rt&}e+Gi UINT nHookCount =0; //挂接的程序数目
A P?R"% static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
c(xrP/yOwi static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
~:s>aQ`! static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
L>Fa^jq5 static int KeyCount =0;
.YAT:;L static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
TNe l/ #pragma data_seg()
K0|FY=#2y X^wt3<Kbf 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。
Kqb#_hm KQ% GIz x 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:
.ypL=~Rp UD2C>1j BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
E Nhl&J cKey,UCHAR cMask)
*&^Pj%DX {
\wz6~5R BOOL bAdded=FALSE;
Z&+ g;(g for(int index=0;index<MAX_KEY;index++){
IL#"~D? if(hCallWnd[index]==0){
Bu~]ey1 hCallWnd[index]=hWnd;
PR#exm& HotKey[index]=cKey;
BLQ 6A< HotKeyMask[index]=cMask;
_)3|f<E_t) bAdded=TRUE;
Tztu}t]N KeyCount++;
c_$=-Khk break;
?jv/TBZX4 }
-A^ _{4X }
UNu#(nP return bAdded;
_^Ubs>d=* }
>
PRFWO //删除热键
qZ}^;)a^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
24 ' J {
t6"%3#s BOOL bRemoved=FALSE;
'urafE4M for(int index=0;index<MAX_KEY;index++){
q_[o"wq/ if(hCallWnd[index]==hWnd){
SaO}e if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
*SJ_z(CZm hCallWnd[index]=NULL;
i+ ?^8# HotKey[index]=0;
_}Ac n$ HotKeyMask[index]=0;
%v
M-mbX bRemoved=TRUE;
K<3A1'_ KeyCount--;
:%=Xm break;
U)o-8OEZ9 }
UERLtSQ }
zj{pJOM06 }
<44G]eb return bRemoved;
AofKw }
Z"xvh81P PO:{t 0
1rK8jX DLL中的钩子函数如下:
&jJL"gq" 4SxX3Fw LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
W:2( .? {
b4 6~?* BOOL bProcessed=FALSE;
E<Y$>uKA if(HC_ACTION==nCode)
kS);xA8s] {
F v2-( if((lParam&0xc0000000)==0xc0000000){// 有键松开
?dg[:1R} switch(wParam)
BL}\D;+t {
H/
HMm{4 case VK_MENU:
)mT<MkP MaskBits&=~ALTBIT;
""G'rN_=Bi break;
K($Npuu] case VK_CONTROL:
Q(?#'<.# MaskBits&=~CTRLBIT;
1.GQau~ break;
-GrE}L case VK_SHIFT:
g]H<}4lgq" MaskBits&=~SHIFTBIT;
*i%.;Z" break;
I+!0 O default: //judge the key and send message
E{`fF8]K break;
f}P3O3Yv& }
.t!x<B for(int index=0;index<MAX_KEY;index++){
jV1.Yz(` if(hCallWnd[index]==NULL)
r`d4e,( continue;
tS=(}2Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&j"?\f? {
SY\ gXO8k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
{4Cmu;u bProcessed=TRUE;
qo bc<- }
l'_r:b }
<\^8fn }
]2KihP8z
x else if((lParam&0xc000ffff)==1){ //有键按下
sDlO# switch(wParam)
JK5gQ3C[ {
Wh*uaad7 case VK_MENU:
VpDbHAg MaskBits|=ALTBIT;
BQMpHSJ_ break;
`M8i92V\qY case VK_CONTROL:
xi}skA MaskBits|=CTRLBIT;
rjYJs*# break;
!%c\N8<>GD case VK_SHIFT:
j A%u 5V MaskBits|=SHIFTBIT;
}K|oicpUg break;
'~=SzO default: //judge the key and send message
@Jw-8Q{ break;
8{sGNCvU }
s;Q!X ?Q for(int index=0;index<MAX_KEY;index++){
uKHxe~ if(hCallWnd[index]==NULL)
(f"4,b^] continue;
AoxA+.O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C LRdm^B {
,k3FRes3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fE
mr^R bProcessed=TRUE;
"4{r6[dn }
v.qrz"98- }
Q*Pq{]0K }
vdwsJPFbc if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
/j.9$H'y for(int index=0;index<MAX_KEY;index++){
]t"Ss_, if(hCallWnd[index]==NULL)
oUlVI*~ND continue;
fz
"Y CHe if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Cp0=k SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
utV_W& //lParam的意义可看MSDN中WM_KEYDOWN部分
=T7.~W }
>^3i|PB }
A.w.rVDD }
sFRQe]zCcP return CallNextHookEx( hHook, nCode, wParam, lParam );
DN6Mo<H }
9hyn`u. EfT=? 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
CU!Dhm/U o ^uA">GH BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
dk^~;m#iN BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`Urhy#LC \s\?l(ooq" 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
hM!a_' k+*u/neh LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
^S; -fYW2 {
6_B]MN!( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
VUuE T {
!dq.KwL //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
#GFr`o0$^ SaveBmp();
/PKN LK return FALSE;
J<lW<:!3] }
(/$^uWj …… //其它处理及默认处理
+lTq^4 }
1|:KQl2q .e-#yET 1xvu<|F 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
yB!dp;gM{ Pg{J{gn 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
19#\+LWA s>c=c-SP. 二、编程步骤
P$,Ke< |uJ%5y# 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";
cZ3v=ke^ J .<F"r> 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
|V(0GB yt2PU_), 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;
RM/ 0A| fN2lLn9/u 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;
CvdN"k -:rUw$3J 5、 添加代码,编译运行程序。
wuo,kM T
u'{&
三、程序代码
:23P!^Y
!5N.B|Nt ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
5lum $5 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
|':{lH6+1 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Y4YJJYvD #if _MSC_VER > 1000
.RL=xb|[ #pragma once
{4PwLCy #endif // _MSC_VER > 1000
9tnD=A<PS #ifndef __AFXWIN_H__
!n%j)`0M #error include 'stdafx.h' before including this file for PCH
D6Wa.,r #endif
2&5K.Ui% #include "resource.h" // main symbols
H,NF;QPPC class CHookApp : public CWinApp
rT>wg1: {
Alq(QDs public:
qxj(p o CHookApp();
jb)ZLA;L_c // Overrides
*NQ/UXE // ClassWizard generated virtual function overrides
\)Cl%Em //{{AFX_VIRTUAL(CHookApp)
v` r:=K public:
phz&zlD virtual BOOL InitInstance();
.S4u- virtual int ExitInstance();
oL<St$1 //}}AFX_VIRTUAL
7[wPn`v2 //{{AFX_MSG(CHookApp)
dF2RH)Ud // NOTE - the ClassWizard will add and remove member functions here.
D/' dTrR // DO NOT EDIT what you see in these blocks of generated code !
Qg/rRiV //}}AFX_MSG
ss-D(K" DECLARE_MESSAGE_MAP()
C9;kpqNG#u };
c*M}N?|6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
," ql5Q4 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
"Rl}VeDY BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*lb<$E]="! BOOL InitHotkey();
>-c8q]()ly BOOL UnInit();
K,UMqAmk #endif
F:ELPs4" .G\7cZ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
: E?V. #include "stdafx.h"
#A.@i+Zv #include "hook.h"
:gC#hmm^ #include <windowsx.h>
BJ0?kX@ #ifdef _DEBUG
'B}qZCy W #define new DEBUG_NEW
048kPXm` #undef THIS_FILE
XX~,>Q}H= static char THIS_FILE[] = __FILE__;
ch]29 #endif
wyG;8I #define MAX_KEY 100
:Tq~8!s #define CTRLBIT 0x04
nRY5xRvK #define ALTBIT 0x02
:hA#m[ #define SHIFTBIT 0x01
E\$W_Lmr #pragma data_seg("shareddata")
Q@H V- (A HHOOK hHook =NULL;
Y\tui+?J UINT nHookCount =0;
!&\INl-Z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
tnIX:6 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
g=I})s:CTp static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
|cY`x(?yP static int KeyCount =0;
H)&R=s static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
2"~8Z(0 #pragma data_seg()
:Qq#Z HINSTANCE hins;
mA} "a<0 void VerifyWindow();
-']56o_sQ/ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
h7@6T+#WoT //{{AFX_MSG_MAP(CHookApp)
A)~6Im // NOTE - the ClassWizard will add and remove mapping macros here.
B-ESFATc // DO NOT EDIT what you see in these blocks of generated code!
"w_aM7x_ //}}AFX_MSG_MAP
i?;Kq~, END_MESSAGE_MAP()
'f|o{ L rPkxmR CHookApp::CHookApp()
y?!"6t7& {
4.(4x& // TODO: add construction code here,
*|l/6!WM // Place all significant initialization in InitInstance
CQ2jP
G*py }
<7$1kGlA ^}C\zW CHookApp theApp;
U<-D(J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
F5#YOck&, {
&?RQZHtg BOOL bProcessed=FALSE;
P>6{&( if(HC_ACTION==nCode)
aN=B]{! {
Er[A X.3 if((lParam&0xc0000000)==0xc0000000){// Key up
J-4:H
gx switch(wParam)
'W#D(l9nI {
1nOCQ\$l case VK_MENU:
bN88ua}k{ MaskBits&=~ALTBIT;
iR0y"Cii break;
O1kl70,`R case VK_CONTROL:
]{L jRSV MaskBits&=~CTRLBIT;
+^<](z break;
c"xK`%e case VK_SHIFT:
UZ$/Ni MaskBits&=~SHIFTBIT;
E!AE4B1bd break;
S@sO;-^+ default: //judge the key and send message
U%<Inb}ad break;
L.WljNo }
39jG8zr=Z[ for(int index=0;index<MAX_KEY;index++){
TB^$1C if(hCallWnd[index]==NULL)
w*MpX
U< continue;
wdZ/Xp9] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#89!'W {
=rK+eG#, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?' je)F bProcessed=TRUE;
hpJ-r }
3k?X-|O8AZ }
abEmRJTmW }
-!9G0h&i| else if((lParam&0xc000ffff)==1){ //Key down
Mc}^LDX switch(wParam)
bJ;'`sw1 {
=I~mKn case VK_MENU:
E.>4C[O MaskBits|=ALTBIT;
MJrR[h] break;
YAmb`CP case VK_CONTROL:
>"<Wjr8W!$ MaskBits|=CTRLBIT;
3yXY.>' break;
EZ`{Wnbq case VK_SHIFT:
{}Za_(Y,] MaskBits|=SHIFTBIT;
s|ITsz0,td break;
b_):MQ1{ default: //judge the key and send message
xP,hTE break;
jNy.Y8E& }
V470C@ for(int index=0;index<MAX_KEY;index++)
n-OL0$Xu {
"g#i'"qnW if(hCallWnd[index]==NULL)
k;L6R!V continue;
D#)b+7N- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
E+JqWR5 {
V2G6Kw9gt SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
MqUH',\3 bProcessed=TRUE;
1!gbTeVlY }
'`<w#z}AF }
!v0LBe4 }
>dG[G> if(!bProcessed){
N.{D$" for(int index=0;index<MAX_KEY;index++){
6MkP |vr6 if(hCallWnd[index]==NULL)
w+{LAS continue;
\'bzt"f$j if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
O0y_Lm\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
veh<R]U }
m9Hit8f@Q }
*D3/@S$B }
?K\axf>F return CallNextHookEx( hHook, nCode, wParam, lParam );
N8FF3}>
g }
}Z,x~G Wiu"k%Qsh BOOL InitHotkey()
'6Q=#:mc\ {
uRr o?m< if(hHook!=NULL){
|H+Wed| nHookCount++;
&pp|U} return TRUE;
Y.r+wc] }
(ICd} else
Nu7
!8[?r* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
ox (%5c)b| if(hHook!=NULL)
/~f'}]W nHookCount++;
Oo%d]8W return (hHook!=NULL);
3jC_AO%T }
qm o9G BOOL UnInit()
0=E]cQwh {
J~UuS+Ufv if(nHookCount>1){
l2P=R)@{ nHookCount--;
`lt"[K< return TRUE;
.xWC{}7[ }
';=O 0)u BOOL unhooked = UnhookWindowsHookEx(hHook);
?m?::R H if(unhooked==TRUE){
1^(ad;BCy nHookCount=0;
QW(Mz Hg hHook=NULL;
ah+iZ}E% }
,>mrPtxN return unhooked;
u($!z^h }
4u5-7[TZ g~A`N=r;h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
P! #[mio {
1F&Trqq BOOL bAdded=FALSE;
-0x
# for(int index=0;index<MAX_KEY;index++){
oHn
Ky[1 if(hCallWnd[index]==0){
}oGA-Qc}B hCallWnd[index]=hWnd;
'Xq|Kf ( HotKey[index]=cKey;
)ea>% HotKeyMask[index]=cMask;
AogVF bAdded=TRUE;
XXn67sF/ KeyCount++;
XBu"-( break;
&H/'rd0M }
S8j{V5R' }
GM f
`A,> return bAdded;
M {T-iW" }
4-H+vNG{% "8jf81V* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
U7}yi$WT {
ieCEo|b BOOL bRemoved=FALSE;
qL3;}R for(int index=0;index<MAX_KEY;index++){
{dMsz
if(hCallWnd[index]==hWnd){
qwgPk9l if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j0evq+ hCallWnd[index]=NULL;
G[I"8iS, HotKey[index]=0;
JL}_72gs HotKeyMask[index]=0;
co|aC!7 bRemoved=TRUE;
EC!02S KeyCount--;
62o:,IcoG break;
.Una+Z }
3E $f) }
Q%tXQP .r }
W^LY'ypT return bRemoved;
ex (.=X 1 }
""F5z,' f=gW]x7'R+ void VerifyWindow()
O$j7i:G'5 {
'3DXPR^B6 for(int i=0;i<MAX_KEY;i++){
F {4bo$~> if(hCallWnd
!=NULL){ PB`Y
g
if(!IsWindow(hCallWnd)){ xvl#w
hCallWnd=NULL; 3z9d!I^>k
HotKey=0; &n}f?
HotKeyMask=0; qCpp6~]Um
KeyCount--; }1i`6`y1
} gANuBWh8T
} J^5So
} e9 5Lo+:f
} O-GJ-
&LZn
FR
BOOL CHookApp::InitInstance() /saIs%(fU
{ ?5|>@>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Pz |>"'
hins=AfxGetInstanceHandle(); A,hJIe
InitHotkey(); cyv`B3}
return CWinApp::InitInstance(); ~{B7 k:
} sRL`dEl4l
ujq=F
int CHookApp::ExitInstance() 9gEwh<
{ ?;+1)> {
VerifyWindow(); )E@.!Ut4o
UnInit(); JNYFD8J~
return CWinApp::ExitInstance(); >#~& -3
} >j(_[z|v3
cr?Q[8%t1
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OXSmt
DvJ
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0gy/:T
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ m^f0V2M_
#if _MSC_VER > 1000 (%e.:W${
#pragma once xPk8$1meZM
#endif // _MSC_VER > 1000 JG!mc7
`maKN \;
class CCaptureDlg : public CDialog ,+vy,<e&
{ zrL$]Oy}x
// Construction w/S%YW3*
public: [OV"}<V
BOOL bTray; mPN@{.(j
BOOL bRegistered; A gg<tM{yB
BOOL RegisterHotkey(); wQH<gJE/:
UCHAR cKey; rc>4vB_ha
UCHAR cMask; K>r,(zgVc
void DeleteIcon(); &(G\[RWp\
void AddIcon(); +]A:M6P:{v
UINT nCount;
bv9i*]
void SaveBmp(); OgQV;at
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?U5{Wa85D
// Dialog Data UkT=W!cq
//{{AFX_DATA(CCaptureDlg) T/Gz94c
enum { IDD = IDD_CAPTURE_DIALOG }; B^Nf #XN(
CComboBox m_Key; [.8BTj1%
BOOL m_bControl; %C'?@,7C
BOOL m_bAlt; YpZ+n*&+
BOOL m_bShift; fk[-mZ
CString m_Path; H*QIB_
CString m_Number; Vb4#,
//}}AFX_DATA YEs &
// ClassWizard generated virtual function overrides 7>|J8*/Nd
//{{AFX_VIRTUAL(CCaptureDlg) ,o{9$H5{
public: *:YiimOY"
virtual BOOL PreTranslateMessage(MSG* pMsg); "Hb"F?Yb
protected: KRLQ #,9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WJndoB.f[2
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Lh"<XYY
//}}AFX_VIRTUAL f/NH:1)y
// Implementation be{H$9'
protected: 3n1;G8Nf
HICON m_hIcon; "XKy#[d2
// Generated message map functions m
)zUU
//{{AFX_MSG(CCaptureDlg) ^f
&XQQY
virtual BOOL OnInitDialog(); ./k/KSR
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @ ZwvBH
afx_msg void OnPaint(); G5RR]?@6V
afx_msg HCURSOR OnQueryDragIcon(); 5C*Pd
Wpl
virtual void OnCancel(); t#/YN.@r
afx_msg void OnAbout(); ZrxD`1L
afx_msg void OnBrowse(); P[#e/qnXu|
afx_msg void OnChange(); b#Z{{eLny
//}}AFX_MSG V>%rv'G8
DECLARE_MESSAGE_MAP() V _/%b)*
}; e*(!^Q1
#endif vNY{j7l/W
9J*\T(W
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Gg3,:A_ w
#include "stdafx.h" g^2OkV(
#include "Capture.h" .E1rqB G
#include "CaptureDlg.h" <#y[gTJ<'>
#include <windowsx.h> sw oQ'
#pragma comment(lib,"hook.lib") BB$>h}
#ifdef _DEBUG d>&,9c%
#define new DEBUG_NEW #m<nAR
#undef THIS_FILE kr5">"7
static char THIS_FILE[] = __FILE__; Z{Qu<vy_
#endif Y3cMC)
#define IDM_SHELL WM_USER+1 hh)`645=x
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B6nX$T4zP
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '!cCMTj
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; TnOggpQ6X
class CAboutDlg : public CDialog qIE9$7*X
{ [nG<[<0G;
public: <8i//HOE
CAboutDlg(); '8.r-`l(
// Dialog Data )?naN
//{{AFX_DATA(CAboutDlg) 4 Y9`IgQ
enum { IDD = IDD_ABOUTBOX }; #u(^0'
P
//}}AFX_DATA ]G=L=D^cK
// ClassWizard generated virtual function overrides UWJ8amA
//{{AFX_VIRTUAL(CAboutDlg) IH&|Tcf\
protected: 7P5)Z-K[
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L>&t|T2
//}}AFX_VIRTUAL D~fl JR
// Implementation b-?gw64#
protected: VUGmi]qd
//{{AFX_MSG(CAboutDlg) 8f4b&ah
//}}AFX_MSG GPv1fearl
DECLARE_MESSAGE_MAP() 82qoGSD.
}; EHIF>@TZ
vHc%z$-d
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @#>rYAb8,
{ SC!RbW@3
//{{AFX_DATA_INIT(CAboutDlg) FP`b>E qOH
//}}AFX_DATA_INIT 4JXeV&5Qk'
} 7~%?#
(ejvF):|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &|ex`nwc0
{ Al^d$FaF
CDialog::DoDataExchange(pDX); w"|L:8
//{{AFX_DATA_MAP(CAboutDlg) 9Cp-qA%t
//}}AFX_DATA_MAP |?xN\O^#}
} g\:[
55;8
cN6X#D
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e@07
//{{AFX_MSG_MAP(CAboutDlg) [`[|l
// No message handlers JPUW6e07o
//}}AFX_MSG_MAP 8z`G,qh
END_MESSAGE_MAP() )}(^,
Fo c
.},'~NM]
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'n]w"]|
: CDialog(CCaptureDlg::IDD, pParent) jo@6?(
*4
{ F6|]4H.3Q
//{{AFX_DATA_INIT(CCaptureDlg) RVmh6m
m_bControl = FALSE; EU;9*W<
m_bAlt = FALSE; eHZws`W
m_bShift = FALSE;
(@VMH !3
m_Path = _T("c:\\"); 70nqD>M4
m_Number = _T("0 picture captured."); GPudaF{
nCount=0; ]Sz:|%JP1
bRegistered=FALSE; e}7lBLK]*
bTray=FALSE; n\'4
//}}AFX_DATA_INIT yYYSeH
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 EGS)b
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (gU!=F?#m
} )m)-o4c
xml7Uarc
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pRpBhm;iJ
{ hH3RP{'=
CDialog::DoDataExchange(pDX); rfg'G&A(
//{{AFX_DATA_MAP(CCaptureDlg) 5m 4P\y^a
DDX_Control(pDX, IDC_KEY, m_Key); w3_>VIZJl
DDX_Check(pDX, IDC_CONTROL, m_bControl); ,PW'#U:
DDX_Check(pDX, IDC_ALT, m_bAlt); i$#;Kpb`^
DDX_Check(pDX, IDC_SHIFT, m_bShift); [yQt^!;
DDX_Text(pDX, IDC_PATH, m_Path); KYI/
DDX_Text(pDX, IDC_NUMBER, m_Number); v$v-2y'%
//}}AFX_DATA_MAP ]p GL`ge5
} CwzZ8.o$i
LL |r
A:
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ie95rZp
//{{AFX_MSG_MAP(CCaptureDlg) M"Hf :9Rk
ON_WM_SYSCOMMAND() 6;d*r$0Fc
ON_WM_PAINT() v{N`.~,^
ON_WM_QUERYDRAGICON() R+z2}}Z!`
ON_BN_CLICKED(ID_ABOUT, OnAbout) F~W6Bp^W
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |aS.a&vwR
ON_BN_CLICKED(ID_CHANGE, OnChange) 4e7-0}0
//}}AFX_MSG_MAP An0|[ uWH
END_MESSAGE_MAP() k]|~>9eY]
yx[/|nZDC4
BOOL CCaptureDlg::OnInitDialog() rXP,\ ]r+
{ lrE5^;/s1
CDialog::OnInitDialog(); ET*SB
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); v!-pSa)3
ASSERT(IDM_ABOUTBOX < 0xF000); JPHL#sKyz
CMenu* pSysMenu = GetSystemMenu(FALSE); |>^JRx
if (pSysMenu != NULL) v ;{#Q&(
{ EME|k{W
CString strAboutMenu; ]s'as9s9
strAboutMenu.LoadString(IDS_ABOUTBOX); Q3~H{)[Kq
if (!strAboutMenu.IsEmpty()) a58H9w"u)
{ ; DR$iH-F
pSysMenu->AppendMenu(MF_SEPARATOR); t{9GVLZ
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \V63qg[
} g:@#@1rB6
} oZgjQM$YP
SetIcon(m_hIcon, TRUE); // Set big icon h(dvZ=
%
SetIcon(m_hIcon, FALSE); // Set small icon %wy.TN
m_Key.SetCurSel(0); >]TWXmx/w
RegisterHotkey(); 9.-S(ZO
CMenu* pMenu=GetSystemMenu(FALSE); C{rcs'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~ .g@hS8>
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zC!t;*8a
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $h"\N$iSq
return TRUE; // return TRUE unless you set the focus to a control 6d}lw6L
}
<kqo^
IEi^kJflU
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "(O>=F&
{ #trK^(
if ((nID & 0xFFF0) == IDM_ABOUTBOX) (?c"$|^J
{ Rhs/3O8k
CAboutDlg dlgAbout; 7n<{tM
dlgAbout.DoModal(); {JT&w6Jz
} f8dB-FlMm
else &p@O_0nF
{
qEOhwrh
CDialog::OnSysCommand(nID, lParam); Yj49t_$b
} v\ )W?i*l
} M%m4i9~!?
(L&d!$,Dv
void CCaptureDlg::OnPaint() [z{1*Xc
{ g!|kp?
if (IsIconic()) ;6$jf:2m
{ KZE,bi:~
CPaintDC dc(this); // device context for painting rb.N~
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n_A3#d<9
// Center icon in client rectangle vk^xT
int cxIcon = GetSystemMetrics(SM_CXICON); n 7[V&`e_
int cyIcon = GetSystemMetrics(SM_CYICON); S=5o
< 1
CRect rect; lL3U8}vn
GetClientRect(&rect); +r2-S~f3N
int x = (rect.Width() - cxIcon + 1) / 2; CA~-rv
int y = (rect.Height() - cyIcon + 1) / 2; ?6U0PChy
// Draw the icon R-$!9mnr
dc.DrawIcon(x, y, m_hIcon); _Fl9>C"u
} 7?_CcRe
else L="}ErmK
{ $U~]=.n
CDialog::OnPaint(); )Aqtew+A&
} h2R::/2.
} 7{*>agQh
gM:".Ee
HCURSOR CCaptureDlg::OnQueryDragIcon() (\x]YMLH
{ wIt}dc
return (HCURSOR) m_hIcon; Fx.=#bVX7
} q_58;Bv
(!WD1w
void CCaptureDlg::OnCancel() xb8!B
{ `|q(h Ow2
if(bTray) ~]2K^bh8&
DeleteIcon(); 5rik7a)Z]
CDialog::OnCancel(); ?e 4/p
} 5\nAeP
F )eelPZ+,
void CCaptureDlg::OnAbout() 4V`G,W4^J
{ a:w#s}bL
CAboutDlg dlg; G 3ptx!
D
dlg.DoModal(); iXjM.G
} ?Ir:g=RP*
;4\;mmLVk
void CCaptureDlg::OnBrowse()
&6VnySE?
{ :V||c 5B+
CString str; (4nq>;$3
BROWSEINFO bi; ckCE1e>s
char name[MAX_PATH]; D0f] $
ZeroMemory(&bi,sizeof(BROWSEINFO)); J|7 3.&B
bi.hwndOwner=GetSafeHwnd(); y:uE3Apm
bi.pszDisplayName=name; gB33?
bi.lpszTitle="Select folder"; ;$g?T~v7
bi.ulFlags=BIF_RETURNONLYFSDIRS; V'gh6`v
LPITEMIDLIST idl=SHBrowseForFolder(&bi); f/?P514h
if(idl==NULL) r~['VhI!;E
return; sW\!hW1*x
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); w7L)'9
str.ReleaseBuffer(); pQB."[n
m_Path=str; (ToUgVW1N
if(str.GetAt(str.GetLength()-1)!='\\') ~k5W@`"W
m_Path+="\\"; JxU5 fe
UpdateData(FALSE); Q7CsJzk~)
} Q"#J6@
fk-RV>yr
void CCaptureDlg::SaveBmp() 4*;MJ[|
{ K|=A:
CDC dc; I&5!=kR
dc.CreateDC("DISPLAY",NULL,NULL,NULL); m1A J{cs
CBitmap bm; om>KU$g
int Width=GetSystemMetrics(SM_CXSCREEN); 8&dF
int Height=GetSystemMetrics(SM_CYSCREEN); <#4h}_xA%
bm.CreateCompatibleBitmap(&dc,Width,Height); HZZn'u
CDC tdc; w0unS`\4
tdc.CreateCompatibleDC(&dc); |R:'\+E
CBitmap*pOld=tdc.SelectObject(&bm); wMN]~|z>
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |_U= z;Y
tdc.SelectObject(pOld); >9J:Uo1z
BITMAP btm; Tlr v={
bm.GetBitmap(&btm); Xch~
1K
DWORD size=btm.bmWidthBytes*btm.bmHeight; .=;
;
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )V9bI( v
BITMAPINFOHEADER bih; lp8v0e4
bih.biBitCount=btm.bmBitsPixel; u ^RxD^=L
bih.biClrImportant=0; BY*8ri^u
bih.biClrUsed=0; #g!.T g'
bih.biCompression=0; 2Tppcj v
bih.biHeight=btm.bmHeight; _)-o1`*-
bih.biPlanes=1; \fe]c :
bih.biSize=sizeof(BITMAPINFOHEADER); Flb&B1
bih.biSizeImage=size; ]]yO1x$Kk
bih.biWidth=btm.bmWidth; 8q7b_Pq1U
bih.biXPelsPerMeter=0; lu/
(4ED
bih.biYPelsPerMeter=0; sDV Q#}a
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Cgc\
ah
static int filecount=0; =2x^nW
CString name; 7 X4LJf
name.Format("pict%04d.bmp",filecount++); 2:ylv<\$
name=m_Path+name; \73ch
BITMAPFILEHEADER bfh; -s/ea~=R
bfh.bfReserved1=bfh.bfReserved2=0; u]@['7
bfh.bfType=((WORD)('M'<< 8)|'B'); tq?!-x+>
bfh.bfSize=54+size; TL#3;l^
bfh.bfOffBits=54; +"VP-s0
CFile bf; +"@ .8m
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (7*}-Uy[C
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); SgOheN-
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *8XEYZa
bf.WriteHuge(lpData,size); @KAI4LP
bf.Close(); Kc(FX%3LU
nCount++; 0m ? )ROaJ
} :BTq!>s
GlobalFreePtr(lpData); #e5\j\#.
if(nCount==1) T[j,UkgGo
m_Number.Format("%d picture captured.",nCount); u#SWj,X
else ?bu>r=oIO]
m_Number.Format("%d pictures captured.",nCount); Rlirs-WQ
UpdateData(FALSE); :Ux_qB
} ct}9i"H#1
e(G|;a
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) GPkpXVm
{ 40
0#v|b
if(pMsg -> message == WM_KEYDOWN) cN9t{.m
{ u<&m]]*
if(pMsg -> wParam == VK_ESCAPE) H>@+om
return TRUE; t
|oR7qa{w
if(pMsg -> wParam == VK_RETURN) _J [P[(ab
return TRUE; ;A!BVq
} hR|MEn6KC
return CDialog::PreTranslateMessage(pMsg); >F&47Yn
} 1aABzB
^
wlmRe`R
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `@s^(hc7i
{ X\F|Tk3_
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *uvQ\.
SaveBmp(); Xn\jO>[Ef
return FALSE; #R
RRu2
} 7=, ; h
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N17RLz *\
CMenu pop; &
ZB
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E1 f\%!2l
CMenu*pMenu=pop.GetSubMenu(0); dC4'{n|7
pMenu->SetDefaultItem(ID_EXITICON); Ecx<OTo
CPoint pt; WMP,\=6k0
GetCursorPos(&pt); ,6W>can
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HUO j0T
if(id==ID_EXITICON) 7J&4akT{9
DeleteIcon(); SK.: Q5:
else if(id==ID_EXIT) pY$Q
OnCancel(); ItTz.sQ
return FALSE; BL58] P84
} RzusNS
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $u6
3]rypm
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) '[O;zJN;
AddIcon(); h `.& f
return res; y18Y:)DkL
} &G$Ucc
`
KCDE{za
void CCaptureDlg::AddIcon() P
L+sR3bR
{ gv{ >`AN
NOTIFYICONDATA data; j1HW._G
data.cbSize=sizeof(NOTIFYICONDATA); ^y4Z+Gu[
CString tip; /|&*QLy
tip.LoadString(IDS_ICONTIP); kz7(Z'pw
data.hIcon=GetIcon(0); 4I5Y,g{6+
data.hWnd=GetSafeHwnd(); Ld-_,-n
strcpy(data.szTip,tip); IdxzE_@
data.uCallbackMessage=IDM_SHELL; W'TaBuCb
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pcI uN
data.uID=98; ]"1DGg \A
Shell_NotifyIcon(NIM_ADD,&data); 9JKEw
ShowWindow(SW_HIDE); bK-N:8Z
bTray=TRUE; maR"t+
} cPc</[x[W
_n\GNUA
void CCaptureDlg::DeleteIcon() 5QO9Q]I#_\
{ ~.lPEA %%
NOTIFYICONDATA data; _oDz-
data.cbSize=sizeof(NOTIFYICONDATA); vgN&K@hJ
data.hWnd=GetSafeHwnd(); !FF U=f
data.uID=98; @!d{bQd,
Shell_NotifyIcon(NIM_DELETE,&data);
1ZB"EQ
ShowWindow(SW_SHOW); _8agtQ:<
SetForegroundWindow(); b*Q&CL
ShowWindow(SW_SHOWNORMAL); O!bOp=
bTray=FALSE;
^L&iR0
} , SnSW-P
G;XxBA
void CCaptureDlg::OnChange() _2 osV[e
{ 5d!-G$@
RegisterHotkey(); yJe>JK~)
} ZWp(GC1NA
c-FcEW
BOOL CCaptureDlg::RegisterHotkey() t.\dpBq
{ 8|58 H
UpdateData(); Yk Qd
UCHAR mask=0; 1]/.` ]1
UCHAR key=0; g95`.V}
if(m_bControl) @2v_pJy^
mask|=4; 2gVm9gAHUd
if(m_bAlt) 2SR: FUV/
mask|=2; d4z/5Oa
if(m_bShift) X+]G-
mask|=1; 3%=~)7cF
key=Key_Table[m_Key.GetCurSel()]; zT?D<XW>1
if(bRegistered){ DrK{}uM
DeleteHotkey(GetSafeHwnd(),cKey,cMask); #@nezu2
bRegistered=FALSE; }|5Pr(I
} ^@NU}S):yN
cMask=mask; r^ ZEImjc
cKey=key; !brf(-sr)
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZO$%[ftb
return bRegistered; jdJ>9O0A,
} R]*K:~DM
SGlNKA},A
四、小结 qK&d]6H
R
[0D.K}7|
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。